Slide 1

Operations Manual
SPF-25/6
AUTOMATIC POWER FACTOR
CONTROLLER

TAS Powertek Pvt. Ltd.
Corporate Office:
W-61, MIDC, Ambad, Nasik - 422010, Maharashtra (India)
Tel: +91-(253)-2384038 / 2381090
Email: [email protected]

NOTE
These instructions do not purport to cover all details or
variations in equipment, nor to provide for every possible
contingency to be met in connection with installation,
operation or maintenance.

Should further information be desired or should particular
problems arise which are not covered sufficiently for the
purchasers purposes, the matter should be referred to our
TAS Powertek Pvt. Ltd., office.
The contents of this instruction Manual shall not become
part of or modify any prior or existing agreement or
relationship. The sales contract contains the entire
obligations of TAS Powertek Pvt. Ltd. The warranty
contained in the contract between the parties is the sole
warranty of TAS Powertek Pvt. Ltd. Any statements
contained herein do not create new warranties or modify the
existing warranty.

The reproduction, transmission or use of this
document or its contents is not permitted
without express written authority. Offenders
will be liable for damages. All rights are
reserved.

Index
Index Page
-----------------Features & Specifications
----------Mechanical Dimensions/ mounting --------Functional Block diagram
-----------------PF correction technique
-----------------Back Side terminals
-----------------------Typical wiring scheme ---------------------Front Facia
---------------------------------Communication connector connections ----Display of various parameters / Status ---Method of Keyboard/Display usage -------Parameter Submenu -----------------------Commissioning Instruction (before Powerup)
Fault finding Guidelines ---------------------

-1-

1
2
3
4
5
6
7
8
9
10
19
22
24
25

Features:
• Totally Micro-processor controlled Digital Signal processing
logic for measurements.
• All measurements with 1.0 class accuracy.
• Automatic Synchronisation capable of giving the correct
results for wrong connections at CT terminals (even wrong
polarity of CTs).
• Measurement and kVAr compensation are frequency / THD
compensated.
• Load V,Iph, In and Cap. current THD measurement.
• Up-to 6 output banks control.
• Capable of doing the kVAr measurements on basis of mean
of the correction cycle time and provide kVAr compensation.
• Standard 144 X 144 cabinet for panel door flush mounting.
• Serial communication through standard TAS protocols.
• Manual testing mode for user checking of the Capacitor steps
switching.
• Protections provided (user settable):
Over/under Voltage
Cap. Over/under current / THD.
Over/Under frequency (internally set limits)
Over / Under load.
Load unbalance.
Capacitor individual step kVAr monitoring.
Out of steps: Under-compensation (only for indication)
NV-RAM battery down.
• Data logging for various parameters for 2months period at an
interval of 1hr.
• Unit comes along with PC (Windows compatible) software
for downloading and viewing the logged data.

Specifications:
•
•
•
•
•
•
•
•
•
•
•
•

Feed-back Voltage:440Volt (+10%/-30%)
Current input : 1Amp for load and capacitor feed-back.
Measurement Accuracy: Class 1.0
Auxiliary Supply: 525Vac to 300Vac.
Correction / Discharge time:
Selectable in seconds from 10sec. to 240sec.
Output commands:
NO contacts each with current rating of 0.5Amp AC. at
240Vac.
RS-232 baud rate selectable from 4.8kBPS to 38.4kBPS.
Operating temperature: 0 to 55oC.
1.0class measurement Operating temperature: 0 to 50oC.
Storage temperature: -10 to +75oC.
Humidity: 0 to 98%.
Supply frequency: 45Hz to 55Hz.

-2-

Mechanical Dimensions:
135

144

135

120
144

6

Recommended size for cutout on panel door is 138 X 138.
All Dimensions given are in mm.

Maximum weight: (with clamps and terminals) = 2.5kg.

-3-

Functional Block Diagram:
3 channel
Current f.b.

3
Channel
Cap.
Current
f.b.

3 channel
Voltage f.b.

SPF-25

V, I, PF and Power
Measurement
Block
For every AC mains
Cycle.

Calculation
Block for
• Energy Parameters
• Harmonic analysis

EEPROM
For Data
Logging

Keyboard,
Display and
Other support
Functions
Block.

RS-232 Serial
Communication.
TAS-01
Protocol stack.

Power Factor
Correction Block
+ event monitoring.

Outputs Commands
For Capacitor
Switching.

Power Supply
Block.

Above block diagram gives the functional blocks that are built into SPF-25 PF
correction relay.
These blocks are made up with the combination of functions from hardware and
corresponding firmware that resides in the Program memory of the micro-processor
used therein.
Even though the basic blocks exists as shown in the diagram, there functionality is
interdependent. The entire combination is carefully designed so as to have
minimum effects of Electrical and Electromagnetic noise level on the functionality of
this SPF-25.
The firmware written takes into various error handling eventualities so that the
functioning of this PF relay is error free and highly reliable.

-4-

PF correction technique:
KVAr Inductive

Target
PF.
Cos Φ
= PF

1.5 X kVAr
Of Smallest
Capacitor bank

KW

No change band.
KVAr Capacitive
Capacitor Addition band.
Capacitor Removal band.
SPF-25 for kVAr compensation works with the kW v/s kVAr diagram as shown here
above.
A band is created across the target PF value. (Target PF is set by user). This band
is of +0.75 of the smallest capacitor bank kVAr. Thus, total band width is always 1.5
times the smallest capacitor bank kVAr used. This is a no change band. If the
mains source parameters are within this band, SPF-25 would not change the
capacitors bank status.
If the mains parameters are out of this “No change band”, then SPF-25 calculates
the correct capacitor bank combination to be added / subtracted and within one
correction cycle brings it within the No change band.
The no change band width is selected as mentioned because it has to prevent unnecessary hunting (switching on/off) of the capacitor banks.

-5-

Back Side terminals:

Voltage
Feed-Back

Auxiliary
Supply

Current
Feed-Back
Output commands.

-6-

Capacitor
Current
Feed-Back

Typical Wiring with SPF-25 PF correction system.
L
O
A
D

L
C
R
+

L
C
R
-

L
C
Y
+

L
C
Y
-

L
C
B
+

L
C
B
-

PH 3
PH 2
PH 1
CCR+
CCRCCY+
CCYCCB+
CCB-

S
P
F
2
5

Auxiliary
Supply

L1
L2

Com
C01
C02
|

C06

Mains Connections:
Phase 1 control:
Neutral control:
Commands:
Load Current CT:
Capacitor Current CT:

-7-

Front Facia of SPF-25:
LCD Display

Step status LED indication
Serial Communication Port

Membrane Keypad

Usage of the UP and DN key makes the LCD display to scroll up
and down. This is used for display of various status as well as for
viewing the On line measured electrical values.
These keys are also used for changing values in Parameters
Editing mode and used for status changing of banks in Manual
mode.
Usage of ENT key is for entering the submenu and / or for setting
up some values.
The L and R keys are used in changing the position of the cursor
from Left to Right and vice-versa.

-8-

RS-232 serial communication 9 pin D connector:

5

4

6

3

7

2

8

1

9
RXD

GND

TXD

RS-232 cable connection Details:

PIN
NO

PC side
Connection

CONNECTION

SPF-25

1

NC

2

RXD

TXD

3

TXD

RXD

GND

GND

4
5
6
7
8
9

NC

-9-

Display of Various Parameters / Status:
PAGE: 00

COSΦ= -0.99 A OK

This is default display screen giving
information on PF, mode and
working status.

COSΦ= -0.99 :This part of the display indicates the Power Factor running value. The
sign –ve indicates that PF is Capacitive and no sign (+ve) indicates that PF is Inductive.
The PF indicated is the overall PF of the three phase system.
A or M :
This part either indicates the letter “A” or letter “M”. The letter A means
that SPF-25 is working in Auto mode.
The letter M means that SPF-25 is presently in Manual mode.
The Auto or Manual modes can be selected by pressing ENT key on this page.
(If Password option is enabled, enter the same by using UP/DN/L/R keys and then
Pressing ENT)
Then by UP or DN key you can stroll between the displays:
“1. Edit Mode”, “2. Auto Mode”, “3.Manual Mode”.
The first one “1.Edit Mode” is for parameter changing. The details of parameter changing
are explained in detail in later part of this manual.
The second and third one as display indicates are for selecting Auto or Manual mode
respectively. The ENT key pressed on selecting the mode desired, puts the SPF-25 into
that mode.
Auto Mode: In this mode SPF-25 works in automatic mode. It switches the capacitor
banks automatically depending on the parameter setting of target PF. This mode is the
default mode and is to be used for unmanned operation of the system controlled by
SPF-25.
Manual Mode: This mode is activated for checking/testing the capacitor banks switching.
Its also used for changing the Masking status of the capacitor banks. More on this is
explained later. (On Page 01 explanation)
OK or ** :
The last part of the display that is blinking every 500mS indicates the
working status of SPF-25. “OK” indicates that unit is working fine without any trip
conditions. If there is other indication, the meaning of the same can be as:
OK
:
No Fault
OC
:
Over Capacitor Current
UC
:
Under Capacitor Current
OL
:
Over Load
UL
:
Under Load
OV
:
Over Voltage
UV
:
Under Voltage
OF
:
Over Frequency
UF
:
Under Frequency
OH
:
Over Capacitor Current THD %.
OB
:
Out of Banks
LU
:
Load Unbalance
BF
:
Battery Failure (RTC)
NV
:
NVRAM Checksum Error
VA
:
Voltage Absent
- 10 -

PAGE: 01

PAGE: 01

______

AUTO

______

MAN

This display indicates the Bank status in Auto mode and in Manual mode it helps
to make the specific bank On or Off or declare masked.
: Means Bank is On.
: Means Bank is Off.
: Means Bank is Off and is declared masked (out of action)
: Means Bank does not exist for compensation.
When the Page 01 is in Auto mode, its only for indication of Bank status.
But in Manual mode, the “ENT” key press activates the manual control
mode. The cursor over the bank number starts blinking. The UP and DN
keys can turn On and Off the respective bank.
The DN key pressed puts the respective bank in Masking mode and another
press of DN key brings it out of Masking mode.

Putting the bank masking status permanently:
If a bank is to be permanently put in masked mode or is to be brought out of
permanent masked mode, it can be done by bringing the blinking cursor on
the position of the respective bank by use of L or R key. Then by pressing
DN key, bring the status of the bank to the required level (Masked or
Unmasked). Then press ENT key so that cursor stops blinking. After that by
pressing UP key go to Page 00. Then Press ENT. (If Password option is
enabled, enter the same by using UP/DN/L/R keys and then Press ENT)
“1.EDIT MODE” would be displayed. Press ENT one more time. “1.General
and IO” would be displayed. Press ENT again. “Pwd : Disable” or “Pwd :
Enable” would be displayed. Press UP key. “Exit: No Save” would be
displayed. Press ENT so that cursor will start blinking. Press UP. “Exit: With
Save” would be displayed with cursor blinking. Press ENT. “Saving in
EEPROM” would be displayed for a short time and then Page 00 would be
displayed.
You will observe that the bank status as requirement is changed
permanently to the status desired.

- 11 -

PAGE: 02

1.Overall Values
PRESS
PAGE: 02.1

Avg Vol: 415.7 V
PAGE: 02.2

Avg Cur: 0123.4A
PAGE: 02.3

Tot KW:

0081.2

PAGE: 02.4

TotKVAR: 0024.6
PAGE: 02.5

Tot KVA: 0101.1
PAGE: 02.6

Avg CC:

0031.3A

PAGE: 02.7

CKVAR:

028.35

PAGE: 02.8

LS PF:

0.82

PAGE: 02.9

LS KVAR: 0043.9
PAGE: 02.10

LS KVA:

0125.7

PAGE: 02.11

Freq:

49.9Hz

The Overall values Display menu has submenus as displayed above. As its
self explanatory it means:
Avg Vol: Average voltage of all the three line to line voltage values.
Avg Cur: Average current of all the three phase line current values.
Tot KW: Overall kW of the three phase system measured at source.
TotKVAR: Overall kVAr of the three phase system measured at source.
Tot KVA: Overall kVA of the three phase system measured at source.
Avg CC: Average of three phase current through capacitor panel.
CKVAR: Capacitive kVAr that is compensated by the system.
LS PF: Load side PF. (PF value if not compensated.
LS KVAR: Load side kVAr.
LS KVA: Load side kVA.
Freq: Supply frequency in Hz.
- 12 -

PAGE: 03

2.Per-Phase RMS

PRESS
PAGE: 03.1

R-Y Vol: 415.7 V
PAGE: 03.2

Y-B Vol: 415.7 V
PAGE: 03.3

B-R Vol: 415.7 V
PAGE: 03.4

Rph Cur: 0110.8A
PAGE: 03.5

Yph Cur: 0110.8A
PAGE: 03.6

Bph Cur: 0110.8A
PAGE: 03.7

Neutral: 0010.2A
PAGE: 03.8

Rph Cap: 0022.5A
PAGE: 03.9

Yph Cap: 0022.5A
PAGE: 03.10

Bph Cap: 0022.5A

Per Phase RMS: Submenu:
R-Y Vol: Measured AC Voltage RMS value across R and Y phase.
Y-B Vol: Measured AC Voltage RMS value across Y and B phase.
B-R Vol: Measured AC Voltage RMS value across B and R phase.
Rph Cur: Line current RMS value in R phase. Mains source.
Yph Cur: Line current RMS value in Y phase. Mains source.
Bph Cur: Line current RMS value in B phase. Mains source.
Neutral: Neutral current RMS value.
Rph Cap: Capacitor current RMS value in R phase.
Yph Cap: Capacitor current RMS value in Y phase.
Bph Cap: Capacitor current RMS value in B phase.

- 13 -

PAGE: 04

3.Power
PRESS
PAGE: 04.1

Rph PF:

PAGE: 04.10

1.00

Rph KVA: 0109.7

PAGE: 04.2

Yph PF:

PAGE: 04.11

1.00

Yph KVA: 0109.7

PAGE: 04.3

Bph PF:

PAGE: 04.12

1.00

Bph KVA: 0109.7

PAGE: 04.4

Rph KW:

PAGE: 04.13

0100.2

RphCKVAR: 010.76

PAGE: 04.5

Yph KW:

PAGE: 04.14

0100.2

YphCKVAR: 010.76

PAGE: 04.6

Bph KW:

PAGE: 04.15

0100.2

BphCKVAR: 010.76

PAGE: 04.7

PAGE: 04.16

RphKVAR: 0020.4

Rph mF

PAGE: 04.8

: 165.06

PAGE: 04.17

YphKVAR: 0020.4

Yph mF

PAGE: 04.9

: 165.06

PAGE: 04.18

BphKVAR: 0020.4

Bph mF

: 165.06

Power: Submenu:
Rph PF: Power Factor of R phase on mains source.
Yph PF: Power Factor of Y phase on mains source.
Bph PF: Power Factor of B phase on mains source.
Rph kW: Active Power in kW in R-phase.
Yph kW: Active Power in kW in Y-phase.
Bph kW: Active Power in kW in B-phase.
RphkVAR: Reactive Power in kVAr in R-phase.
YphkVAR: Reactive Power in kVAr in Y-phase.
BphkVAR: Reactive Power in kVAr in B-phase.
Rph KVA: Apparent Power in kVA in R-phase.
Yph KVA: Apparent Power in kVA in Y-phase.
Bph KVA: Apparent Power in kVA in B-phase.
RphCKVAR: Capacitor injected reactive power in R-phase.
YphCKVAR: Capacitor injected reactive power in Y-phase.
BphCKVAR: Capacitor injected reactive power in B-phase.
Rph mF: Capacitor value in micro-farad in R-phase.
Yph mF: Capacitor value in micro-farad in Y-phase.
Bph mF: Capacitor value in micro-farad in B-phase.
- 14 -

PAGE: 05

4.Energy
PRESS
PAGE: 05.1

KWH:

1234567.8

PAGE: 05.2

IndKVARH:12345.6
PAGE: 05.3

CapKVARH:12345.6
PAGE: 05.4

KVAH:

1234567.8

PAGE: 05.5

CKVARH:1234567.8

Energy: Submenu:
KWH: Overall cumulative active energy in kWh on Mains supply.
IndKVARH: Inductive reactive energy in kVArh on Mains supply.
CapKVARH: Capacitive reactive energy in kVArh on Mains supply.
KVAH: Overall cumulative apparent energy in kVA on Mains supply.
CKVARH: Capacitor compensated reactive energy in kVArh.

- 15 -

PAGE: 06

5.Harmonics
PRESS
PAGE: 06.1

Vr-THD-F: 002.4%
PAGE: 06.2

Vy-THD-F: 002.4%
PAGE: 06.3

Vb-THD-F: 002.4%
PAGE: 06.4

Ir-THD-F: 012.5%
PAGE: 06.5

Iy-THD-F: 012.5%
PAGE: 06.6

Ib-THD-F: 012.5%
PAGE: 06.7

In-THD-F: 005.0%
PAGE: 06.8

CCr-THD-F:028.2%
PAGE: 06.9

CCy-THD-F:028.2%
PAGE: 06.10

CCb-THD-F:028.2%

Harmonics: Submenu:
Vr-THD-F/R: R-Y line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Vy-THD-F/R: Y-B line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Vb-THD-F/R: B-R line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Ir-THD-F/R: R phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Iy-THD-F/R: Y phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Ib-THD-F/R: B phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
In-THD-F/R: Neutral current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
CCr-THD-F/R: R phase Capacitor current % Total Harmonic Distortion.
CCy-THD-F/R: Y phase Capacitor current % Total Harmonic Distortion.
CCb-THD-F/R: B phase Capacitor current % Total Harmonic Distortion.

- 16 -

PAGE: 07

6.Step KVAR
PRESS
PAGE: 07.1

Stp1 KVAR:0009.0
PAGE: 07.2

Stp2 KVAR:0009.0
PAGE: 07.3

Stp3 KVAR:0009.0
PAGE: 07.4

Stp4 KVAR:0009.0
PAGE: 07.5

Stp5 KVAR:0009.0
PAGE: 07.6

Stp6 KVAR:0009.0

Step KVAR: Submenu:
Stp1 KVAR: Step 1 kVAr value normalized at Capacitor rated voltage.
Stp2 KVAR: Step 2 kVAr value normalized at Capacitor rated voltage.
Stp3 KVAR: Step 3 kVAr value normalized at Capacitor rated voltage.
Stp4 KVAR: Step 4 kVAr value normalized at Capacitor rated voltage.
Stp5 KVAR: Step 5 kVAr value normalized at Capacitor rated voltage.
Stp6 KVAR: Step 6 kVAr value normalized at Capacitor rated voltage.

- 17 -

PAGE: 08

Time: 10:10:00
Real Time Clock: RTC time set in the SPF-25 is displayed here. Its in
HH:MM:SS format.

PAGE: 09

Date: 07:11:06
Real Time Clock: RTC date set in the SPF-25 is displayed here. Its in
dd:mm:yy format.

PAGE: 10

SPF-25 1.0.6

SPF-25 internal firmware version number is displayed here. (Just for user
information)

Total number of Main display pages are 11nos ranging from “00” to
“10”.

- 18 -

Method for Keyboard/Display usage.

Flow chart for entering into different modes:

PRESS
Enable

Default
Display
mode

If Password
Option is
Enable/Disable.

Disable

Enter Pwd: ****
PRESS
Enter the 4
Digit password
By use of
L, R, UP & DN
Keys.

PRESS

NO

IF
PASSWORD
Correct?

*

YES
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

1.Edit Mode

2.Auto Mode

3.Manual Mode

- 19 -

Parameter Editing Submenu Level 1:

*
1.General
2.System
3.Fault
4.Step
5.Communication

Sub-menu
Level 1
for
Parameter
Editing.

Parameter Editing
Sub-Menu
LEVEL 2

1.General and IO: Parameters related with general function and Input/Output
2. System: Electrical system (Mains supply) related parameters.

3. Fault: Setting Faults and fault levels.
4. Step: Capacitor Steps related parameters.
5. Communication: Parameters related with communication and data logging.

- 20 -

Parameter Editing Method:
(For Submenu Level 2 : L2)

Sub-Menu Level 1.
Cursor Blinking
at Parameter Values.

1.Submenu L2: ****

1.Submenu L2: ****
PRESS

key to increment value.

PRESS

Key to decrement value.

PRESS

Key to shift cursor Left.

PRESS

Key to shift cursor Right.
2.Submenu L2: ****

2.Submenu L2: ****
PRESS

key to increment value.

PRESS

Key to decrement value.

PRESS

Key to shift cursor Left.

PRESS

Key to shift cursor Right.

3.Submenu L2: ****

Exit: No Save

Exit: No Save

Without saving

Default
Display.

With saving

Screen for 1second

Saving In EEProm

Exit: With Save

- 21 -

Parameter Editing Submenu Level 2:
Menu
General

Parameter
Pwd
Ch-Pwd
Ld Def
THD
Rst. Energy

Meaning of Parameter
Password Control
Password value
Load all factory default parameters.
Type of THD factor to be displayed
Energy Counters reset to zero option

Default
Enable
1111
No
F-THD
No

Menu
System

Parameter
Meas. Vol.
Ld. Cur. Pr.
Cap. Cur. Pr.
PF Target
PF Target
Auto Sync
Async Tol.
Reset Async

Meaning of Parameter
Default
SPF-25 rated measurement voltage
440
Primary current value of mains CT
0180
0075
Primary current value of capacitor CT
Target PF for deciding Lag or Lead
Lag
1.00
Target PF exact value
Automatic synchronisation requirement Yes
% load variation tolerence for Auto-sync. 30
No
Reset Auto-sync to default value.

Menu
Fault

Parameter
Over Vol.
Over Vol. Lim
Over Vol. Clr
Under Vol.
Under Vol. Lim
Under Vol. Clr
Over Load
Over Ld. Lim
Over Ld. Clr
Under Ld.
Under Ld. Lim
Under Ld. Clr
Ld. Unbalance
Ld. Unb. Lim
Over CC
Over CC. Lim
Over CC. Clr
Over CC. Rst.
Over CC. Rst.
Under CC.
Under CC. Lim
Under CC. CLr
CC THD
CC THD Lim
CC THD Clr
Step Check
Cap. Cur Tol
Under Comp.
RTC Bat

Meaning of Parameter
Default
Over Voltage Fault: action by PDE-30 Off Step
Over Voltage activation limit value
1.10
Over Voltage resumption limit value 1.05
Under Voltage Fault: Action?
Off Step
Under Voltage activation limit value 0.70
Under Voltage resumption limit value 0.75
Over Load Fault: Action?
Indicate
Mains current over load limit value
1.30
Mains cur. over load resume value
1.25
Under Load on Mains: Action?
Indicate
Under load Activation limit value
0.03
Under load Resumption limit value
0.05
Load Un-balance Fault: Action?
Off Step
Load Un-balance limit
025%
Capacitor Over Current Fault: Action? Disable
Cap. Over Current Limit value.
1.30
Cap. Over Current Resume value.
1.25
Auto reset feature on Cap. Over Cur. No
If Over CC. Rst.=Yes. Time for reset. 120 sec
Under Capacitor current fault: Action? Disable
Under Cap. Cur. Limit value.
0.95
Under Cap. Cur. Resume value.
0.97
Capacitor current Over THD: Action? Disable
Cap.Cur. Over THD limit value.
0.10
Cap.Cur. Over THD resume value.
0.08
Every step kVAr healthiness monitor. Disable
Step kVAr healthiness: tolerence.
0.10
Out of Banks Indication.
Disable
RTC Battery fault monitoring.
Enable

- 22 -

Min
Disable
0000
No
R-THD
No
Min
Non
0001
0001
Lead
0.70Lag
No
01
No

Min

Max
Enable
9999
Yes
F-THD
Yes
Max
Edible
9999
9999
Lag
0.85Lead
Yes
50
Yes

Max

Disable, Indicative, Off Step

0.90
0.85

1.20
1.15

Disable, Indicative, Off Step

0.70
0.75

0.95
1.00

Disable, Indicative, Off Step

1.10
1.05

1.30
1.25

Disable, Indicative, Off Step

0.01
0.02

0.20
0.25

Disable, Indicative, Off Step

005%

100%

Disable, Indicative, Off Step

1.05
1.00
No
15

1.50
1.45
Yes
900

Disable, Indicative, Off Step

0.75
0.80

0.98
1.00

Disable, Indicative, Off Step

0.02
0.01
Disable
0.03
Disable
Disable

0.99
0.90
Enable
0.50
Enable
Enable

Menu
Step

Parameter
No. of Steps
Step Vol
Corr. Time
Discharge Time
Step 1 KVAR
Step 2 KVAR
Step 3 KVAR
Step 4 KVAR
Step 5 KVAR
Step 6 KVAR

Meaning of Parameter
Number of Capacitor steps utilised
Voltage at which kVAr is defined
Correction cycle time.
Capacitor discharge time.
Step 1 kVAr value.
Step 2 kVAr value.
Step 3 kVAr value.
Step 4 kVAr value.
Step 5 kVAr value.
Step 6 kVAr value.

Menu
Parameter
Meaning of Parameter
Communication Unit ID
Communication ID of the unit
Baud Rate
Serial communication baud rate.
Time
RTC time to be set
Date
RTC date to be set
Init RTC
Initialise RTC?
Clear NVRAM Clear all contents on NV RAM?

Default
3
440
120 secs
120 secs
006
009
018
018
018
018

Min
1
380
010
010
001
001
001
001
001
001

Default
3001
09600
--No
No

Min
0000
04800
--No
No

Max
6
660
240
240
250
250
250
250
250
250

Max
9999
38400
--Yes
Yes

Note that all the parameters in the Sub-Menu Level 2 should be carefully filled in the
SPF-25. Failing to put the correct parameters can make SPF-25 to malfunction.
Its therefore advised that a trained person should only be allowed to change these
values.

- 23 -

Commissioning Instructions :
before panel is powered up for the first time.
1. Panel Wiring Check
Ensure that all connections in the panel is tightened properly and there are no
loose connections. Also ensure that the wiring is done as per the wiring
diagram.
2. Power Wiring Check
Ensure that the power cables are connected properly from the Panel I/C to the
feeder I/C or the transformer bushings. The connection has to be after the
Load Feed back CT looking from the Transformer side.
Ensure that the Bus Bars and/or Lugs are clean and free of Dust, Corrosion or
Oxidation on the contact sides so that good electrical connection is maintained.
The surface area should be flat so as to get maximum contact area.
If required Clean the Bus Bars and/ or Lugs by rubbing it with Polish Paper to
remove the oxidation layer. Provide contact paste in between the contacts
surfaces.
Not performing this, can result in to a weaker source point for Capacitor
charging during Step on and this can generate undesirable Noise which can
hamper the performance of equipments installed in the capacitor panel.
3. Load Feed Back CT connection.
Ensure that the load feed back CT connections are done properly. Confirm that
correct phase CT is connected with the correct phase input terminals. (Even
though auto sync is capable of taking care of wrong CT polarities or CT
position interchanging, but then on display, the Phase readings may be seen to
be interchanged. (May be R-phase reading would be seen in B-phase and
vice-versa.
CT connections to be done carefully so as to ensure that the wire does not get
open and there is no loose connection.

Loose connection’s or open CT secondary can result in to very high voltages
getting developed in the circuit which can damage the CT and also produce
high levels of noise in the system.

- 24 -

Fault Finding Guidelines :

Fault Type

Probable Reason

Action to Take

Unit Does not
turn ON. No
display on LCD.

•Input auxiliary supply
not coming.
•Input side fuses
blown

•Check the input
supply to restore
•Check fuses in the
unit for OK.

Unit does not
turn On any
capacitors even
if PF is below
Lower PF limit.

•If auto-sync failure
message is there at
Power On.

• Load may be highly
fluctuating so need of
manual
synchronisation only.
• This is OK
condition.

• The load KW is too
low with Under load
fault enable condition.
•Control connections
from SPF-25 to
contactor coils are not
proper

•Check control supply
and connections from
SPF-25 to contactors.

BF indication on
Default display.

• Internal Ni-Cd
3.2Vdc battery used
for RTC and NV RAM
must be drained down.

• Replace this battery
in consultancy with
TAS trained
personnel.

Some Capacitor
banks are
declared as
faulty even if
they are
checked to be
OK.

•Individual step health
monitoring is enabled
and tolerance limits
set are too stringent.
• Capacitor current
THD factor is
continuously
fluctuating.

•Set the tolerance
limits for individual
steps monitoring as
relaxed.
• With continuously
fluctuating THD of
Capacitor current and
higher level of THD
can cause some
errors in individual
step KVAR
measurement. Under
this condition, best is
to keep this feature
disabled.

- 25 -

Fault Finding Guidelines (continued):

Fault Type

Probable Reason

Action to Take

Serial
Communication
is not working.

• Baud rate selection
is not proper.
• Unit ID is not set
properly.
• Serial
communication cable
connections are not
proper.

• Select proper baud
rate.
• Set the unit ID
correctly.
• Check the serial
cable continuity as
per the connections
given earlier in this
manual.

Data logging is
not taking place.

• Possible that RTC
date is not set
properly.

• Change the battery
by help of TAS’s
authorised person.

SPF-25 resets
occasionally on
turning OFF of
any contactor.

• The contactor supply
phase may be the
same as used for SPF25 auxiliary supply.
• RC snubbers/ free
wheeling diodes are
not put with contactor
coils.

• Use the different
phase for control
supply of contactors
and for SPF-25 supply
• Usage of RC
snubbers / free
wheeling diodes is
mandatory.

- 26 -

Corporate Office/Works/Design Centre:
W-61, MIDC, Ambad, Nasik - 422010, Maharashtra (India)
Tel: +91-(253)-2384038 / 2381090
Email: [email protected]
Marketing and After-Sales Service:
A/58, Kamal Pushpa, K.C. Road, Bandra, Mumbai-400050.
Tel: +91-9930513923
Email: [email protected]
Regional Office: Delhi
191-B, Ground Floor, Padam Nagar (Filter Market),
New Delhi - 110007 (India).
Tel: +91-9911615701
Email: [email protected]


Slide 2

Operations Manual
SPF-25/6
AUTOMATIC POWER FACTOR
CONTROLLER

TAS Powertek Pvt. Ltd.
Corporate Office:
W-61, MIDC, Ambad, Nasik - 422010, Maharashtra (India)
Tel: +91-(253)-2384038 / 2381090
Email: [email protected]

NOTE
These instructions do not purport to cover all details or
variations in equipment, nor to provide for every possible
contingency to be met in connection with installation,
operation or maintenance.

Should further information be desired or should particular
problems arise which are not covered sufficiently for the
purchasers purposes, the matter should be referred to our
TAS Powertek Pvt. Ltd., office.
The contents of this instruction Manual shall not become
part of or modify any prior or existing agreement or
relationship. The sales contract contains the entire
obligations of TAS Powertek Pvt. Ltd. The warranty
contained in the contract between the parties is the sole
warranty of TAS Powertek Pvt. Ltd. Any statements
contained herein do not create new warranties or modify the
existing warranty.

The reproduction, transmission or use of this
document or its contents is not permitted
without express written authority. Offenders
will be liable for damages. All rights are
reserved.

Index
Index Page
-----------------Features & Specifications
----------Mechanical Dimensions/ mounting --------Functional Block diagram
-----------------PF correction technique
-----------------Back Side terminals
-----------------------Typical wiring scheme ---------------------Front Facia
---------------------------------Communication connector connections ----Display of various parameters / Status ---Method of Keyboard/Display usage -------Parameter Submenu -----------------------Commissioning Instruction (before Powerup)
Fault finding Guidelines ---------------------

-1-

1
2
3
4
5
6
7
8
9
10
19
22
24
25

Features:
• Totally Micro-processor controlled Digital Signal processing
logic for measurements.
• All measurements with 1.0 class accuracy.
• Automatic Synchronisation capable of giving the correct
results for wrong connections at CT terminals (even wrong
polarity of CTs).
• Measurement and kVAr compensation are frequency / THD
compensated.
• Load V,Iph, In and Cap. current THD measurement.
• Up-to 6 output banks control.
• Capable of doing the kVAr measurements on basis of mean
of the correction cycle time and provide kVAr compensation.
• Standard 144 X 144 cabinet for panel door flush mounting.
• Serial communication through standard TAS protocols.
• Manual testing mode for user checking of the Capacitor steps
switching.
• Protections provided (user settable):
Over/under Voltage
Cap. Over/under current / THD.
Over/Under frequency (internally set limits)
Over / Under load.
Load unbalance.
Capacitor individual step kVAr monitoring.
Out of steps: Under-compensation (only for indication)
NV-RAM battery down.
• Data logging for various parameters for 2months period at an
interval of 1hr.
• Unit comes along with PC (Windows compatible) software
for downloading and viewing the logged data.

Specifications:
•
•
•
•
•
•
•
•
•
•
•
•

Feed-back Voltage:440Volt (+10%/-30%)
Current input : 1Amp for load and capacitor feed-back.
Measurement Accuracy: Class 1.0
Auxiliary Supply: 525Vac to 300Vac.
Correction / Discharge time:
Selectable in seconds from 10sec. to 240sec.
Output commands:
NO contacts each with current rating of 0.5Amp AC. at
240Vac.
RS-232 baud rate selectable from 4.8kBPS to 38.4kBPS.
Operating temperature: 0 to 55oC.
1.0class measurement Operating temperature: 0 to 50oC.
Storage temperature: -10 to +75oC.
Humidity: 0 to 98%.
Supply frequency: 45Hz to 55Hz.

-2-

Mechanical Dimensions:
135

144

135

120
144

6

Recommended size for cutout on panel door is 138 X 138.
All Dimensions given are in mm.

Maximum weight: (with clamps and terminals) = 2.5kg.

-3-

Functional Block Diagram:
3 channel
Current f.b.

3
Channel
Cap.
Current
f.b.

3 channel
Voltage f.b.

SPF-25

V, I, PF and Power
Measurement
Block
For every AC mains
Cycle.

Calculation
Block for
• Energy Parameters
• Harmonic analysis

EEPROM
For Data
Logging

Keyboard,
Display and
Other support
Functions
Block.

RS-232 Serial
Communication.
TAS-01
Protocol stack.

Power Factor
Correction Block
+ event monitoring.

Outputs Commands
For Capacitor
Switching.

Power Supply
Block.

Above block diagram gives the functional blocks that are built into SPF-25 PF
correction relay.
These blocks are made up with the combination of functions from hardware and
corresponding firmware that resides in the Program memory of the micro-processor
used therein.
Even though the basic blocks exists as shown in the diagram, there functionality is
interdependent. The entire combination is carefully designed so as to have
minimum effects of Electrical and Electromagnetic noise level on the functionality of
this SPF-25.
The firmware written takes into various error handling eventualities so that the
functioning of this PF relay is error free and highly reliable.

-4-

PF correction technique:
KVAr Inductive

Target
PF.
Cos Φ
= PF

1.5 X kVAr
Of Smallest
Capacitor bank

KW

No change band.
KVAr Capacitive
Capacitor Addition band.
Capacitor Removal band.
SPF-25 for kVAr compensation works with the kW v/s kVAr diagram as shown here
above.
A band is created across the target PF value. (Target PF is set by user). This band
is of +0.75 of the smallest capacitor bank kVAr. Thus, total band width is always 1.5
times the smallest capacitor bank kVAr used. This is a no change band. If the
mains source parameters are within this band, SPF-25 would not change the
capacitors bank status.
If the mains parameters are out of this “No change band”, then SPF-25 calculates
the correct capacitor bank combination to be added / subtracted and within one
correction cycle brings it within the No change band.
The no change band width is selected as mentioned because it has to prevent unnecessary hunting (switching on/off) of the capacitor banks.

-5-

Back Side terminals:

Voltage
Feed-Back

Auxiliary
Supply

Current
Feed-Back
Output commands.

-6-

Capacitor
Current
Feed-Back

Typical Wiring with SPF-25 PF correction system.
L
O
A
D

L
C
R
+

L
C
R
-

L
C
Y
+

L
C
Y
-

L
C
B
+

L
C
B
-

PH 3
PH 2
PH 1
CCR+
CCRCCY+
CCYCCB+
CCB-

S
P
F
2
5

Auxiliary
Supply

L1
L2

Com
C01
C02
|

C06

Mains Connections:
Phase 1 control:
Neutral control:
Commands:
Load Current CT:
Capacitor Current CT:

-7-

Front Facia of SPF-25:
LCD Display

Step status LED indication
Serial Communication Port

Membrane Keypad

Usage of the UP and DN key makes the LCD display to scroll up
and down. This is used for display of various status as well as for
viewing the On line measured electrical values.
These keys are also used for changing values in Parameters
Editing mode and used for status changing of banks in Manual
mode.
Usage of ENT key is for entering the submenu and / or for setting
up some values.
The L and R keys are used in changing the position of the cursor
from Left to Right and vice-versa.

-8-

RS-232 serial communication 9 pin D connector:

5

4

6

3

7

2

8

1

9
RXD

GND

TXD

RS-232 cable connection Details:

PIN
NO

PC side
Connection

CONNECTION

SPF-25

1

NC

2

RXD

TXD

3

TXD

RXD

GND

GND

4
5
6
7
8
9

NC

-9-

Display of Various Parameters / Status:
PAGE: 00

COSΦ= -0.99 A OK

This is default display screen giving
information on PF, mode and
working status.

COSΦ= -0.99 :This part of the display indicates the Power Factor running value. The
sign –ve indicates that PF is Capacitive and no sign (+ve) indicates that PF is Inductive.
The PF indicated is the overall PF of the three phase system.
A or M :
This part either indicates the letter “A” or letter “M”. The letter A means
that SPF-25 is working in Auto mode.
The letter M means that SPF-25 is presently in Manual mode.
The Auto or Manual modes can be selected by pressing ENT key on this page.
(If Password option is enabled, enter the same by using UP/DN/L/R keys and then
Pressing ENT)
Then by UP or DN key you can stroll between the displays:
“1. Edit Mode”, “2. Auto Mode”, “3.Manual Mode”.
The first one “1.Edit Mode” is for parameter changing. The details of parameter changing
are explained in detail in later part of this manual.
The second and third one as display indicates are for selecting Auto or Manual mode
respectively. The ENT key pressed on selecting the mode desired, puts the SPF-25 into
that mode.
Auto Mode: In this mode SPF-25 works in automatic mode. It switches the capacitor
banks automatically depending on the parameter setting of target PF. This mode is the
default mode and is to be used for unmanned operation of the system controlled by
SPF-25.
Manual Mode: This mode is activated for checking/testing the capacitor banks switching.
Its also used for changing the Masking status of the capacitor banks. More on this is
explained later. (On Page 01 explanation)
OK or ** :
The last part of the display that is blinking every 500mS indicates the
working status of SPF-25. “OK” indicates that unit is working fine without any trip
conditions. If there is other indication, the meaning of the same can be as:
OK
:
No Fault
OC
:
Over Capacitor Current
UC
:
Under Capacitor Current
OL
:
Over Load
UL
:
Under Load
OV
:
Over Voltage
UV
:
Under Voltage
OF
:
Over Frequency
UF
:
Under Frequency
OH
:
Over Capacitor Current THD %.
OB
:
Out of Banks
LU
:
Load Unbalance
BF
:
Battery Failure (RTC)
NV
:
NVRAM Checksum Error
VA
:
Voltage Absent
- 10 -

PAGE: 01

PAGE: 01

______

AUTO

______

MAN

This display indicates the Bank status in Auto mode and in Manual mode it helps
to make the specific bank On or Off or declare masked.
: Means Bank is On.
: Means Bank is Off.
: Means Bank is Off and is declared masked (out of action)
: Means Bank does not exist for compensation.
When the Page 01 is in Auto mode, its only for indication of Bank status.
But in Manual mode, the “ENT” key press activates the manual control
mode. The cursor over the bank number starts blinking. The UP and DN
keys can turn On and Off the respective bank.
The DN key pressed puts the respective bank in Masking mode and another
press of DN key brings it out of Masking mode.

Putting the bank masking status permanently:
If a bank is to be permanently put in masked mode or is to be brought out of
permanent masked mode, it can be done by bringing the blinking cursor on
the position of the respective bank by use of L or R key. Then by pressing
DN key, bring the status of the bank to the required level (Masked or
Unmasked). Then press ENT key so that cursor stops blinking. After that by
pressing UP key go to Page 00. Then Press ENT. (If Password option is
enabled, enter the same by using UP/DN/L/R keys and then Press ENT)
“1.EDIT MODE” would be displayed. Press ENT one more time. “1.General
and IO” would be displayed. Press ENT again. “Pwd : Disable” or “Pwd :
Enable” would be displayed. Press UP key. “Exit: No Save” would be
displayed. Press ENT so that cursor will start blinking. Press UP. “Exit: With
Save” would be displayed with cursor blinking. Press ENT. “Saving in
EEPROM” would be displayed for a short time and then Page 00 would be
displayed.
You will observe that the bank status as requirement is changed
permanently to the status desired.

- 11 -

PAGE: 02

1.Overall Values
PRESS
PAGE: 02.1

Avg Vol: 415.7 V
PAGE: 02.2

Avg Cur: 0123.4A
PAGE: 02.3

Tot KW:

0081.2

PAGE: 02.4

TotKVAR: 0024.6
PAGE: 02.5

Tot KVA: 0101.1
PAGE: 02.6

Avg CC:

0031.3A

PAGE: 02.7

CKVAR:

028.35

PAGE: 02.8

LS PF:

0.82

PAGE: 02.9

LS KVAR: 0043.9
PAGE: 02.10

LS KVA:

0125.7

PAGE: 02.11

Freq:

49.9Hz

The Overall values Display menu has submenus as displayed above. As its
self explanatory it means:
Avg Vol: Average voltage of all the three line to line voltage values.
Avg Cur: Average current of all the three phase line current values.
Tot KW: Overall kW of the three phase system measured at source.
TotKVAR: Overall kVAr of the three phase system measured at source.
Tot KVA: Overall kVA of the three phase system measured at source.
Avg CC: Average of three phase current through capacitor panel.
CKVAR: Capacitive kVAr that is compensated by the system.
LS PF: Load side PF. (PF value if not compensated.
LS KVAR: Load side kVAr.
LS KVA: Load side kVA.
Freq: Supply frequency in Hz.
- 12 -

PAGE: 03

2.Per-Phase RMS

PRESS
PAGE: 03.1

R-Y Vol: 415.7 V
PAGE: 03.2

Y-B Vol: 415.7 V
PAGE: 03.3

B-R Vol: 415.7 V
PAGE: 03.4

Rph Cur: 0110.8A
PAGE: 03.5

Yph Cur: 0110.8A
PAGE: 03.6

Bph Cur: 0110.8A
PAGE: 03.7

Neutral: 0010.2A
PAGE: 03.8

Rph Cap: 0022.5A
PAGE: 03.9

Yph Cap: 0022.5A
PAGE: 03.10

Bph Cap: 0022.5A

Per Phase RMS: Submenu:
R-Y Vol: Measured AC Voltage RMS value across R and Y phase.
Y-B Vol: Measured AC Voltage RMS value across Y and B phase.
B-R Vol: Measured AC Voltage RMS value across B and R phase.
Rph Cur: Line current RMS value in R phase. Mains source.
Yph Cur: Line current RMS value in Y phase. Mains source.
Bph Cur: Line current RMS value in B phase. Mains source.
Neutral: Neutral current RMS value.
Rph Cap: Capacitor current RMS value in R phase.
Yph Cap: Capacitor current RMS value in Y phase.
Bph Cap: Capacitor current RMS value in B phase.

- 13 -

PAGE: 04

3.Power
PRESS
PAGE: 04.1

Rph PF:

PAGE: 04.10

1.00

Rph KVA: 0109.7

PAGE: 04.2

Yph PF:

PAGE: 04.11

1.00

Yph KVA: 0109.7

PAGE: 04.3

Bph PF:

PAGE: 04.12

1.00

Bph KVA: 0109.7

PAGE: 04.4

Rph KW:

PAGE: 04.13

0100.2

RphCKVAR: 010.76

PAGE: 04.5

Yph KW:

PAGE: 04.14

0100.2

YphCKVAR: 010.76

PAGE: 04.6

Bph KW:

PAGE: 04.15

0100.2

BphCKVAR: 010.76

PAGE: 04.7

PAGE: 04.16

RphKVAR: 0020.4

Rph mF

PAGE: 04.8

: 165.06

PAGE: 04.17

YphKVAR: 0020.4

Yph mF

PAGE: 04.9

: 165.06

PAGE: 04.18

BphKVAR: 0020.4

Bph mF

: 165.06

Power: Submenu:
Rph PF: Power Factor of R phase on mains source.
Yph PF: Power Factor of Y phase on mains source.
Bph PF: Power Factor of B phase on mains source.
Rph kW: Active Power in kW in R-phase.
Yph kW: Active Power in kW in Y-phase.
Bph kW: Active Power in kW in B-phase.
RphkVAR: Reactive Power in kVAr in R-phase.
YphkVAR: Reactive Power in kVAr in Y-phase.
BphkVAR: Reactive Power in kVAr in B-phase.
Rph KVA: Apparent Power in kVA in R-phase.
Yph KVA: Apparent Power in kVA in Y-phase.
Bph KVA: Apparent Power in kVA in B-phase.
RphCKVAR: Capacitor injected reactive power in R-phase.
YphCKVAR: Capacitor injected reactive power in Y-phase.
BphCKVAR: Capacitor injected reactive power in B-phase.
Rph mF: Capacitor value in micro-farad in R-phase.
Yph mF: Capacitor value in micro-farad in Y-phase.
Bph mF: Capacitor value in micro-farad in B-phase.
- 14 -

PAGE: 05

4.Energy
PRESS
PAGE: 05.1

KWH:

1234567.8

PAGE: 05.2

IndKVARH:12345.6
PAGE: 05.3

CapKVARH:12345.6
PAGE: 05.4

KVAH:

1234567.8

PAGE: 05.5

CKVARH:1234567.8

Energy: Submenu:
KWH: Overall cumulative active energy in kWh on Mains supply.
IndKVARH: Inductive reactive energy in kVArh on Mains supply.
CapKVARH: Capacitive reactive energy in kVArh on Mains supply.
KVAH: Overall cumulative apparent energy in kVA on Mains supply.
CKVARH: Capacitor compensated reactive energy in kVArh.

- 15 -

PAGE: 06

5.Harmonics
PRESS
PAGE: 06.1

Vr-THD-F: 002.4%
PAGE: 06.2

Vy-THD-F: 002.4%
PAGE: 06.3

Vb-THD-F: 002.4%
PAGE: 06.4

Ir-THD-F: 012.5%
PAGE: 06.5

Iy-THD-F: 012.5%
PAGE: 06.6

Ib-THD-F: 012.5%
PAGE: 06.7

In-THD-F: 005.0%
PAGE: 06.8

CCr-THD-F:028.2%
PAGE: 06.9

CCy-THD-F:028.2%
PAGE: 06.10

CCb-THD-F:028.2%

Harmonics: Submenu:
Vr-THD-F/R: R-Y line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Vy-THD-F/R: Y-B line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Vb-THD-F/R: B-R line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Ir-THD-F/R: R phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Iy-THD-F/R: Y phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Ib-THD-F/R: B phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
In-THD-F/R: Neutral current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
CCr-THD-F/R: R phase Capacitor current % Total Harmonic Distortion.
CCy-THD-F/R: Y phase Capacitor current % Total Harmonic Distortion.
CCb-THD-F/R: B phase Capacitor current % Total Harmonic Distortion.

- 16 -

PAGE: 07

6.Step KVAR
PRESS
PAGE: 07.1

Stp1 KVAR:0009.0
PAGE: 07.2

Stp2 KVAR:0009.0
PAGE: 07.3

Stp3 KVAR:0009.0
PAGE: 07.4

Stp4 KVAR:0009.0
PAGE: 07.5

Stp5 KVAR:0009.0
PAGE: 07.6

Stp6 KVAR:0009.0

Step KVAR: Submenu:
Stp1 KVAR: Step 1 kVAr value normalized at Capacitor rated voltage.
Stp2 KVAR: Step 2 kVAr value normalized at Capacitor rated voltage.
Stp3 KVAR: Step 3 kVAr value normalized at Capacitor rated voltage.
Stp4 KVAR: Step 4 kVAr value normalized at Capacitor rated voltage.
Stp5 KVAR: Step 5 kVAr value normalized at Capacitor rated voltage.
Stp6 KVAR: Step 6 kVAr value normalized at Capacitor rated voltage.

- 17 -

PAGE: 08

Time: 10:10:00
Real Time Clock: RTC time set in the SPF-25 is displayed here. Its in
HH:MM:SS format.

PAGE: 09

Date: 07:11:06
Real Time Clock: RTC date set in the SPF-25 is displayed here. Its in
dd:mm:yy format.

PAGE: 10

SPF-25 1.0.6

SPF-25 internal firmware version number is displayed here. (Just for user
information)

Total number of Main display pages are 11nos ranging from “00” to
“10”.

- 18 -

Method for Keyboard/Display usage.

Flow chart for entering into different modes:

PRESS
Enable

Default
Display
mode

If Password
Option is
Enable/Disable.

Disable

Enter Pwd: ****
PRESS
Enter the 4
Digit password
By use of
L, R, UP & DN
Keys.

PRESS

NO

IF
PASSWORD
Correct?

*

YES
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

1.Edit Mode

2.Auto Mode

3.Manual Mode

- 19 -

Parameter Editing Submenu Level 1:

*
1.General
2.System
3.Fault
4.Step
5.Communication

Sub-menu
Level 1
for
Parameter
Editing.

Parameter Editing
Sub-Menu
LEVEL 2

1.General and IO: Parameters related with general function and Input/Output
2. System: Electrical system (Mains supply) related parameters.

3. Fault: Setting Faults and fault levels.
4. Step: Capacitor Steps related parameters.
5. Communication: Parameters related with communication and data logging.

- 20 -

Parameter Editing Method:
(For Submenu Level 2 : L2)

Sub-Menu Level 1.
Cursor Blinking
at Parameter Values.

1.Submenu L2: ****

1.Submenu L2: ****
PRESS

key to increment value.

PRESS

Key to decrement value.

PRESS

Key to shift cursor Left.

PRESS

Key to shift cursor Right.
2.Submenu L2: ****

2.Submenu L2: ****
PRESS

key to increment value.

PRESS

Key to decrement value.

PRESS

Key to shift cursor Left.

PRESS

Key to shift cursor Right.

3.Submenu L2: ****

Exit: No Save

Exit: No Save

Without saving

Default
Display.

With saving

Screen for 1second

Saving In EEProm

Exit: With Save

- 21 -

Parameter Editing Submenu Level 2:
Menu
General

Parameter
Pwd
Ch-Pwd
Ld Def
THD
Rst. Energy

Meaning of Parameter
Password Control
Password value
Load all factory default parameters.
Type of THD factor to be displayed
Energy Counters reset to zero option

Default
Enable
1111
No
F-THD
No

Menu
System

Parameter
Meas. Vol.
Ld. Cur. Pr.
Cap. Cur. Pr.
PF Target
PF Target
Auto Sync
Async Tol.
Reset Async

Meaning of Parameter
Default
SPF-25 rated measurement voltage
440
Primary current value of mains CT
0180
0075
Primary current value of capacitor CT
Target PF for deciding Lag or Lead
Lag
1.00
Target PF exact value
Automatic synchronisation requirement Yes
% load variation tolerence for Auto-sync. 30
No
Reset Auto-sync to default value.

Menu
Fault

Parameter
Over Vol.
Over Vol. Lim
Over Vol. Clr
Under Vol.
Under Vol. Lim
Under Vol. Clr
Over Load
Over Ld. Lim
Over Ld. Clr
Under Ld.
Under Ld. Lim
Under Ld. Clr
Ld. Unbalance
Ld. Unb. Lim
Over CC
Over CC. Lim
Over CC. Clr
Over CC. Rst.
Over CC. Rst.
Under CC.
Under CC. Lim
Under CC. CLr
CC THD
CC THD Lim
CC THD Clr
Step Check
Cap. Cur Tol
Under Comp.
RTC Bat

Meaning of Parameter
Default
Over Voltage Fault: action by PDE-30 Off Step
Over Voltage activation limit value
1.10
Over Voltage resumption limit value 1.05
Under Voltage Fault: Action?
Off Step
Under Voltage activation limit value 0.70
Under Voltage resumption limit value 0.75
Over Load Fault: Action?
Indicate
Mains current over load limit value
1.30
Mains cur. over load resume value
1.25
Under Load on Mains: Action?
Indicate
Under load Activation limit value
0.03
Under load Resumption limit value
0.05
Load Un-balance Fault: Action?
Off Step
Load Un-balance limit
025%
Capacitor Over Current Fault: Action? Disable
Cap. Over Current Limit value.
1.30
Cap. Over Current Resume value.
1.25
Auto reset feature on Cap. Over Cur. No
If Over CC. Rst.=Yes. Time for reset. 120 sec
Under Capacitor current fault: Action? Disable
Under Cap. Cur. Limit value.
0.95
Under Cap. Cur. Resume value.
0.97
Capacitor current Over THD: Action? Disable
Cap.Cur. Over THD limit value.
0.10
Cap.Cur. Over THD resume value.
0.08
Every step kVAr healthiness monitor. Disable
Step kVAr healthiness: tolerence.
0.10
Out of Banks Indication.
Disable
RTC Battery fault monitoring.
Enable

- 22 -

Min
Disable
0000
No
R-THD
No
Min
Non
0001
0001
Lead
0.70Lag
No
01
No

Min

Max
Enable
9999
Yes
F-THD
Yes
Max
Edible
9999
9999
Lag
0.85Lead
Yes
50
Yes

Max

Disable, Indicative, Off Step

0.90
0.85

1.20
1.15

Disable, Indicative, Off Step

0.70
0.75

0.95
1.00

Disable, Indicative, Off Step

1.10
1.05

1.30
1.25

Disable, Indicative, Off Step

0.01
0.02

0.20
0.25

Disable, Indicative, Off Step

005%

100%

Disable, Indicative, Off Step

1.05
1.00
No
15

1.50
1.45
Yes
900

Disable, Indicative, Off Step

0.75
0.80

0.98
1.00

Disable, Indicative, Off Step

0.02
0.01
Disable
0.03
Disable
Disable

0.99
0.90
Enable
0.50
Enable
Enable

Menu
Step

Parameter
No. of Steps
Step Vol
Corr. Time
Discharge Time
Step 1 KVAR
Step 2 KVAR
Step 3 KVAR
Step 4 KVAR
Step 5 KVAR
Step 6 KVAR

Meaning of Parameter
Number of Capacitor steps utilised
Voltage at which kVAr is defined
Correction cycle time.
Capacitor discharge time.
Step 1 kVAr value.
Step 2 kVAr value.
Step 3 kVAr value.
Step 4 kVAr value.
Step 5 kVAr value.
Step 6 kVAr value.

Menu
Parameter
Meaning of Parameter
Communication Unit ID
Communication ID of the unit
Baud Rate
Serial communication baud rate.
Time
RTC time to be set
Date
RTC date to be set
Init RTC
Initialise RTC?
Clear NVRAM Clear all contents on NV RAM?

Default
3
440
120 secs
120 secs
006
009
018
018
018
018

Min
1
380
010
010
001
001
001
001
001
001

Default
3001
09600
--No
No

Min
0000
04800
--No
No

Max
6
660
240
240
250
250
250
250
250
250

Max
9999
38400
--Yes
Yes

Note that all the parameters in the Sub-Menu Level 2 should be carefully filled in the
SPF-25. Failing to put the correct parameters can make SPF-25 to malfunction.
Its therefore advised that a trained person should only be allowed to change these
values.

- 23 -

Commissioning Instructions :
before panel is powered up for the first time.
1. Panel Wiring Check
Ensure that all connections in the panel is tightened properly and there are no
loose connections. Also ensure that the wiring is done as per the wiring
diagram.
2. Power Wiring Check
Ensure that the power cables are connected properly from the Panel I/C to the
feeder I/C or the transformer bushings. The connection has to be after the
Load Feed back CT looking from the Transformer side.
Ensure that the Bus Bars and/or Lugs are clean and free of Dust, Corrosion or
Oxidation on the contact sides so that good electrical connection is maintained.
The surface area should be flat so as to get maximum contact area.
If required Clean the Bus Bars and/ or Lugs by rubbing it with Polish Paper to
remove the oxidation layer. Provide contact paste in between the contacts
surfaces.
Not performing this, can result in to a weaker source point for Capacitor
charging during Step on and this can generate undesirable Noise which can
hamper the performance of equipments installed in the capacitor panel.
3. Load Feed Back CT connection.
Ensure that the load feed back CT connections are done properly. Confirm that
correct phase CT is connected with the correct phase input terminals. (Even
though auto sync is capable of taking care of wrong CT polarities or CT
position interchanging, but then on display, the Phase readings may be seen to
be interchanged. (May be R-phase reading would be seen in B-phase and
vice-versa.
CT connections to be done carefully so as to ensure that the wire does not get
open and there is no loose connection.

Loose connection’s or open CT secondary can result in to very high voltages
getting developed in the circuit which can damage the CT and also produce
high levels of noise in the system.

- 24 -

Fault Finding Guidelines :

Fault Type

Probable Reason

Action to Take

Unit Does not
turn ON. No
display on LCD.

•Input auxiliary supply
not coming.
•Input side fuses
blown

•Check the input
supply to restore
•Check fuses in the
unit for OK.

Unit does not
turn On any
capacitors even
if PF is below
Lower PF limit.

•If auto-sync failure
message is there at
Power On.

• Load may be highly
fluctuating so need of
manual
synchronisation only.
• This is OK
condition.

• The load KW is too
low with Under load
fault enable condition.
•Control connections
from SPF-25 to
contactor coils are not
proper

•Check control supply
and connections from
SPF-25 to contactors.

BF indication on
Default display.

• Internal Ni-Cd
3.2Vdc battery used
for RTC and NV RAM
must be drained down.

• Replace this battery
in consultancy with
TAS trained
personnel.

Some Capacitor
banks are
declared as
faulty even if
they are
checked to be
OK.

•Individual step health
monitoring is enabled
and tolerance limits
set are too stringent.
• Capacitor current
THD factor is
continuously
fluctuating.

•Set the tolerance
limits for individual
steps monitoring as
relaxed.
• With continuously
fluctuating THD of
Capacitor current and
higher level of THD
can cause some
errors in individual
step KVAR
measurement. Under
this condition, best is
to keep this feature
disabled.

- 25 -

Fault Finding Guidelines (continued):

Fault Type

Probable Reason

Action to Take

Serial
Communication
is not working.

• Baud rate selection
is not proper.
• Unit ID is not set
properly.
• Serial
communication cable
connections are not
proper.

• Select proper baud
rate.
• Set the unit ID
correctly.
• Check the serial
cable continuity as
per the connections
given earlier in this
manual.

Data logging is
not taking place.

• Possible that RTC
date is not set
properly.

• Change the battery
by help of TAS’s
authorised person.

SPF-25 resets
occasionally on
turning OFF of
any contactor.

• The contactor supply
phase may be the
same as used for SPF25 auxiliary supply.
• RC snubbers/ free
wheeling diodes are
not put with contactor
coils.

• Use the different
phase for control
supply of contactors
and for SPF-25 supply
• Usage of RC
snubbers / free
wheeling diodes is
mandatory.

- 26 -

Corporate Office/Works/Design Centre:
W-61, MIDC, Ambad, Nasik - 422010, Maharashtra (India)
Tel: +91-(253)-2384038 / 2381090
Email: [email protected]
Marketing and After-Sales Service:
A/58, Kamal Pushpa, K.C. Road, Bandra, Mumbai-400050.
Tel: +91-9930513923
Email: [email protected]
Regional Office: Delhi
191-B, Ground Floor, Padam Nagar (Filter Market),
New Delhi - 110007 (India).
Tel: +91-9911615701
Email: [email protected]


Slide 3

Operations Manual
SPF-25/6
AUTOMATIC POWER FACTOR
CONTROLLER

TAS Powertek Pvt. Ltd.
Corporate Office:
W-61, MIDC, Ambad, Nasik - 422010, Maharashtra (India)
Tel: +91-(253)-2384038 / 2381090
Email: [email protected]

NOTE
These instructions do not purport to cover all details or
variations in equipment, nor to provide for every possible
contingency to be met in connection with installation,
operation or maintenance.

Should further information be desired or should particular
problems arise which are not covered sufficiently for the
purchasers purposes, the matter should be referred to our
TAS Powertek Pvt. Ltd., office.
The contents of this instruction Manual shall not become
part of or modify any prior or existing agreement or
relationship. The sales contract contains the entire
obligations of TAS Powertek Pvt. Ltd. The warranty
contained in the contract between the parties is the sole
warranty of TAS Powertek Pvt. Ltd. Any statements
contained herein do not create new warranties or modify the
existing warranty.

The reproduction, transmission or use of this
document or its contents is not permitted
without express written authority. Offenders
will be liable for damages. All rights are
reserved.

Index
Index Page
-----------------Features & Specifications
----------Mechanical Dimensions/ mounting --------Functional Block diagram
-----------------PF correction technique
-----------------Back Side terminals
-----------------------Typical wiring scheme ---------------------Front Facia
---------------------------------Communication connector connections ----Display of various parameters / Status ---Method of Keyboard/Display usage -------Parameter Submenu -----------------------Commissioning Instruction (before Powerup)
Fault finding Guidelines ---------------------

-1-

1
2
3
4
5
6
7
8
9
10
19
22
24
25

Features:
• Totally Micro-processor controlled Digital Signal processing
logic for measurements.
• All measurements with 1.0 class accuracy.
• Automatic Synchronisation capable of giving the correct
results for wrong connections at CT terminals (even wrong
polarity of CTs).
• Measurement and kVAr compensation are frequency / THD
compensated.
• Load V,Iph, In and Cap. current THD measurement.
• Up-to 6 output banks control.
• Capable of doing the kVAr measurements on basis of mean
of the correction cycle time and provide kVAr compensation.
• Standard 144 X 144 cabinet for panel door flush mounting.
• Serial communication through standard TAS protocols.
• Manual testing mode for user checking of the Capacitor steps
switching.
• Protections provided (user settable):
Over/under Voltage
Cap. Over/under current / THD.
Over/Under frequency (internally set limits)
Over / Under load.
Load unbalance.
Capacitor individual step kVAr monitoring.
Out of steps: Under-compensation (only for indication)
NV-RAM battery down.
• Data logging for various parameters for 2months period at an
interval of 1hr.
• Unit comes along with PC (Windows compatible) software
for downloading and viewing the logged data.

Specifications:
•
•
•
•
•
•
•
•
•
•
•
•

Feed-back Voltage:440Volt (+10%/-30%)
Current input : 1Amp for load and capacitor feed-back.
Measurement Accuracy: Class 1.0
Auxiliary Supply: 525Vac to 300Vac.
Correction / Discharge time:
Selectable in seconds from 10sec. to 240sec.
Output commands:
NO contacts each with current rating of 0.5Amp AC. at
240Vac.
RS-232 baud rate selectable from 4.8kBPS to 38.4kBPS.
Operating temperature: 0 to 55oC.
1.0class measurement Operating temperature: 0 to 50oC.
Storage temperature: -10 to +75oC.
Humidity: 0 to 98%.
Supply frequency: 45Hz to 55Hz.

-2-

Mechanical Dimensions:
135

144

135

120
144

6

Recommended size for cutout on panel door is 138 X 138.
All Dimensions given are in mm.

Maximum weight: (with clamps and terminals) = 2.5kg.

-3-

Functional Block Diagram:
3 channel
Current f.b.

3
Channel
Cap.
Current
f.b.

3 channel
Voltage f.b.

SPF-25

V, I, PF and Power
Measurement
Block
For every AC mains
Cycle.

Calculation
Block for
• Energy Parameters
• Harmonic analysis

EEPROM
For Data
Logging

Keyboard,
Display and
Other support
Functions
Block.

RS-232 Serial
Communication.
TAS-01
Protocol stack.

Power Factor
Correction Block
+ event monitoring.

Outputs Commands
For Capacitor
Switching.

Power Supply
Block.

Above block diagram gives the functional blocks that are built into SPF-25 PF
correction relay.
These blocks are made up with the combination of functions from hardware and
corresponding firmware that resides in the Program memory of the micro-processor
used therein.
Even though the basic blocks exists as shown in the diagram, there functionality is
interdependent. The entire combination is carefully designed so as to have
minimum effects of Electrical and Electromagnetic noise level on the functionality of
this SPF-25.
The firmware written takes into various error handling eventualities so that the
functioning of this PF relay is error free and highly reliable.

-4-

PF correction technique:
KVAr Inductive

Target
PF.
Cos Φ
= PF

1.5 X kVAr
Of Smallest
Capacitor bank

KW

No change band.
KVAr Capacitive
Capacitor Addition band.
Capacitor Removal band.
SPF-25 for kVAr compensation works with the kW v/s kVAr diagram as shown here
above.
A band is created across the target PF value. (Target PF is set by user). This band
is of +0.75 of the smallest capacitor bank kVAr. Thus, total band width is always 1.5
times the smallest capacitor bank kVAr used. This is a no change band. If the
mains source parameters are within this band, SPF-25 would not change the
capacitors bank status.
If the mains parameters are out of this “No change band”, then SPF-25 calculates
the correct capacitor bank combination to be added / subtracted and within one
correction cycle brings it within the No change band.
The no change band width is selected as mentioned because it has to prevent unnecessary hunting (switching on/off) of the capacitor banks.

-5-

Back Side terminals:

Voltage
Feed-Back

Auxiliary
Supply

Current
Feed-Back
Output commands.

-6-

Capacitor
Current
Feed-Back

Typical Wiring with SPF-25 PF correction system.
L
O
A
D

L
C
R
+

L
C
R
-

L
C
Y
+

L
C
Y
-

L
C
B
+

L
C
B
-

PH 3
PH 2
PH 1
CCR+
CCRCCY+
CCYCCB+
CCB-

S
P
F
2
5

Auxiliary
Supply

L1
L2

Com
C01
C02
|

C06

Mains Connections:
Phase 1 control:
Neutral control:
Commands:
Load Current CT:
Capacitor Current CT:

-7-

Front Facia of SPF-25:
LCD Display

Step status LED indication
Serial Communication Port

Membrane Keypad

Usage of the UP and DN key makes the LCD display to scroll up
and down. This is used for display of various status as well as for
viewing the On line measured electrical values.
These keys are also used for changing values in Parameters
Editing mode and used for status changing of banks in Manual
mode.
Usage of ENT key is for entering the submenu and / or for setting
up some values.
The L and R keys are used in changing the position of the cursor
from Left to Right and vice-versa.

-8-

RS-232 serial communication 9 pin D connector:

5

4

6

3

7

2

8

1

9
RXD

GND

TXD

RS-232 cable connection Details:

PIN
NO

PC side
Connection

CONNECTION

SPF-25

1

NC

2

RXD

TXD

3

TXD

RXD

GND

GND

4
5
6
7
8
9

NC

-9-

Display of Various Parameters / Status:
PAGE: 00

COSΦ= -0.99 A OK

This is default display screen giving
information on PF, mode and
working status.

COSΦ= -0.99 :This part of the display indicates the Power Factor running value. The
sign –ve indicates that PF is Capacitive and no sign (+ve) indicates that PF is Inductive.
The PF indicated is the overall PF of the three phase system.
A or M :
This part either indicates the letter “A” or letter “M”. The letter A means
that SPF-25 is working in Auto mode.
The letter M means that SPF-25 is presently in Manual mode.
The Auto or Manual modes can be selected by pressing ENT key on this page.
(If Password option is enabled, enter the same by using UP/DN/L/R keys and then
Pressing ENT)
Then by UP or DN key you can stroll between the displays:
“1. Edit Mode”, “2. Auto Mode”, “3.Manual Mode”.
The first one “1.Edit Mode” is for parameter changing. The details of parameter changing
are explained in detail in later part of this manual.
The second and third one as display indicates are for selecting Auto or Manual mode
respectively. The ENT key pressed on selecting the mode desired, puts the SPF-25 into
that mode.
Auto Mode: In this mode SPF-25 works in automatic mode. It switches the capacitor
banks automatically depending on the parameter setting of target PF. This mode is the
default mode and is to be used for unmanned operation of the system controlled by
SPF-25.
Manual Mode: This mode is activated for checking/testing the capacitor banks switching.
Its also used for changing the Masking status of the capacitor banks. More on this is
explained later. (On Page 01 explanation)
OK or ** :
The last part of the display that is blinking every 500mS indicates the
working status of SPF-25. “OK” indicates that unit is working fine without any trip
conditions. If there is other indication, the meaning of the same can be as:
OK
:
No Fault
OC
:
Over Capacitor Current
UC
:
Under Capacitor Current
OL
:
Over Load
UL
:
Under Load
OV
:
Over Voltage
UV
:
Under Voltage
OF
:
Over Frequency
UF
:
Under Frequency
OH
:
Over Capacitor Current THD %.
OB
:
Out of Banks
LU
:
Load Unbalance
BF
:
Battery Failure (RTC)
NV
:
NVRAM Checksum Error
VA
:
Voltage Absent
- 10 -

PAGE: 01

PAGE: 01

______

AUTO

______

MAN

This display indicates the Bank status in Auto mode and in Manual mode it helps
to make the specific bank On or Off or declare masked.
: Means Bank is On.
: Means Bank is Off.
: Means Bank is Off and is declared masked (out of action)
: Means Bank does not exist for compensation.
When the Page 01 is in Auto mode, its only for indication of Bank status.
But in Manual mode, the “ENT” key press activates the manual control
mode. The cursor over the bank number starts blinking. The UP and DN
keys can turn On and Off the respective bank.
The DN key pressed puts the respective bank in Masking mode and another
press of DN key brings it out of Masking mode.

Putting the bank masking status permanently:
If a bank is to be permanently put in masked mode or is to be brought out of
permanent masked mode, it can be done by bringing the blinking cursor on
the position of the respective bank by use of L or R key. Then by pressing
DN key, bring the status of the bank to the required level (Masked or
Unmasked). Then press ENT key so that cursor stops blinking. After that by
pressing UP key go to Page 00. Then Press ENT. (If Password option is
enabled, enter the same by using UP/DN/L/R keys and then Press ENT)
“1.EDIT MODE” would be displayed. Press ENT one more time. “1.General
and IO” would be displayed. Press ENT again. “Pwd : Disable” or “Pwd :
Enable” would be displayed. Press UP key. “Exit: No Save” would be
displayed. Press ENT so that cursor will start blinking. Press UP. “Exit: With
Save” would be displayed with cursor blinking. Press ENT. “Saving in
EEPROM” would be displayed for a short time and then Page 00 would be
displayed.
You will observe that the bank status as requirement is changed
permanently to the status desired.

- 11 -

PAGE: 02

1.Overall Values
PRESS
PAGE: 02.1

Avg Vol: 415.7 V
PAGE: 02.2

Avg Cur: 0123.4A
PAGE: 02.3

Tot KW:

0081.2

PAGE: 02.4

TotKVAR: 0024.6
PAGE: 02.5

Tot KVA: 0101.1
PAGE: 02.6

Avg CC:

0031.3A

PAGE: 02.7

CKVAR:

028.35

PAGE: 02.8

LS PF:

0.82

PAGE: 02.9

LS KVAR: 0043.9
PAGE: 02.10

LS KVA:

0125.7

PAGE: 02.11

Freq:

49.9Hz

The Overall values Display menu has submenus as displayed above. As its
self explanatory it means:
Avg Vol: Average voltage of all the three line to line voltage values.
Avg Cur: Average current of all the three phase line current values.
Tot KW: Overall kW of the three phase system measured at source.
TotKVAR: Overall kVAr of the three phase system measured at source.
Tot KVA: Overall kVA of the three phase system measured at source.
Avg CC: Average of three phase current through capacitor panel.
CKVAR: Capacitive kVAr that is compensated by the system.
LS PF: Load side PF. (PF value if not compensated.
LS KVAR: Load side kVAr.
LS KVA: Load side kVA.
Freq: Supply frequency in Hz.
- 12 -

PAGE: 03

2.Per-Phase RMS

PRESS
PAGE: 03.1

R-Y Vol: 415.7 V
PAGE: 03.2

Y-B Vol: 415.7 V
PAGE: 03.3

B-R Vol: 415.7 V
PAGE: 03.4

Rph Cur: 0110.8A
PAGE: 03.5

Yph Cur: 0110.8A
PAGE: 03.6

Bph Cur: 0110.8A
PAGE: 03.7

Neutral: 0010.2A
PAGE: 03.8

Rph Cap: 0022.5A
PAGE: 03.9

Yph Cap: 0022.5A
PAGE: 03.10

Bph Cap: 0022.5A

Per Phase RMS: Submenu:
R-Y Vol: Measured AC Voltage RMS value across R and Y phase.
Y-B Vol: Measured AC Voltage RMS value across Y and B phase.
B-R Vol: Measured AC Voltage RMS value across B and R phase.
Rph Cur: Line current RMS value in R phase. Mains source.
Yph Cur: Line current RMS value in Y phase. Mains source.
Bph Cur: Line current RMS value in B phase. Mains source.
Neutral: Neutral current RMS value.
Rph Cap: Capacitor current RMS value in R phase.
Yph Cap: Capacitor current RMS value in Y phase.
Bph Cap: Capacitor current RMS value in B phase.

- 13 -

PAGE: 04

3.Power
PRESS
PAGE: 04.1

Rph PF:

PAGE: 04.10

1.00

Rph KVA: 0109.7

PAGE: 04.2

Yph PF:

PAGE: 04.11

1.00

Yph KVA: 0109.7

PAGE: 04.3

Bph PF:

PAGE: 04.12

1.00

Bph KVA: 0109.7

PAGE: 04.4

Rph KW:

PAGE: 04.13

0100.2

RphCKVAR: 010.76

PAGE: 04.5

Yph KW:

PAGE: 04.14

0100.2

YphCKVAR: 010.76

PAGE: 04.6

Bph KW:

PAGE: 04.15

0100.2

BphCKVAR: 010.76

PAGE: 04.7

PAGE: 04.16

RphKVAR: 0020.4

Rph mF

PAGE: 04.8

: 165.06

PAGE: 04.17

YphKVAR: 0020.4

Yph mF

PAGE: 04.9

: 165.06

PAGE: 04.18

BphKVAR: 0020.4

Bph mF

: 165.06

Power: Submenu:
Rph PF: Power Factor of R phase on mains source.
Yph PF: Power Factor of Y phase on mains source.
Bph PF: Power Factor of B phase on mains source.
Rph kW: Active Power in kW in R-phase.
Yph kW: Active Power in kW in Y-phase.
Bph kW: Active Power in kW in B-phase.
RphkVAR: Reactive Power in kVAr in R-phase.
YphkVAR: Reactive Power in kVAr in Y-phase.
BphkVAR: Reactive Power in kVAr in B-phase.
Rph KVA: Apparent Power in kVA in R-phase.
Yph KVA: Apparent Power in kVA in Y-phase.
Bph KVA: Apparent Power in kVA in B-phase.
RphCKVAR: Capacitor injected reactive power in R-phase.
YphCKVAR: Capacitor injected reactive power in Y-phase.
BphCKVAR: Capacitor injected reactive power in B-phase.
Rph mF: Capacitor value in micro-farad in R-phase.
Yph mF: Capacitor value in micro-farad in Y-phase.
Bph mF: Capacitor value in micro-farad in B-phase.
- 14 -

PAGE: 05

4.Energy
PRESS
PAGE: 05.1

KWH:

1234567.8

PAGE: 05.2

IndKVARH:12345.6
PAGE: 05.3

CapKVARH:12345.6
PAGE: 05.4

KVAH:

1234567.8

PAGE: 05.5

CKVARH:1234567.8

Energy: Submenu:
KWH: Overall cumulative active energy in kWh on Mains supply.
IndKVARH: Inductive reactive energy in kVArh on Mains supply.
CapKVARH: Capacitive reactive energy in kVArh on Mains supply.
KVAH: Overall cumulative apparent energy in kVA on Mains supply.
CKVARH: Capacitor compensated reactive energy in kVArh.

- 15 -

PAGE: 06

5.Harmonics
PRESS
PAGE: 06.1

Vr-THD-F: 002.4%
PAGE: 06.2

Vy-THD-F: 002.4%
PAGE: 06.3

Vb-THD-F: 002.4%
PAGE: 06.4

Ir-THD-F: 012.5%
PAGE: 06.5

Iy-THD-F: 012.5%
PAGE: 06.6

Ib-THD-F: 012.5%
PAGE: 06.7

In-THD-F: 005.0%
PAGE: 06.8

CCr-THD-F:028.2%
PAGE: 06.9

CCy-THD-F:028.2%
PAGE: 06.10

CCb-THD-F:028.2%

Harmonics: Submenu:
Vr-THD-F/R: R-Y line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Vy-THD-F/R: Y-B line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Vb-THD-F/R: B-R line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Ir-THD-F/R: R phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Iy-THD-F/R: Y phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Ib-THD-F/R: B phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
In-THD-F/R: Neutral current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
CCr-THD-F/R: R phase Capacitor current % Total Harmonic Distortion.
CCy-THD-F/R: Y phase Capacitor current % Total Harmonic Distortion.
CCb-THD-F/R: B phase Capacitor current % Total Harmonic Distortion.

- 16 -

PAGE: 07

6.Step KVAR
PRESS
PAGE: 07.1

Stp1 KVAR:0009.0
PAGE: 07.2

Stp2 KVAR:0009.0
PAGE: 07.3

Stp3 KVAR:0009.0
PAGE: 07.4

Stp4 KVAR:0009.0
PAGE: 07.5

Stp5 KVAR:0009.0
PAGE: 07.6

Stp6 KVAR:0009.0

Step KVAR: Submenu:
Stp1 KVAR: Step 1 kVAr value normalized at Capacitor rated voltage.
Stp2 KVAR: Step 2 kVAr value normalized at Capacitor rated voltage.
Stp3 KVAR: Step 3 kVAr value normalized at Capacitor rated voltage.
Stp4 KVAR: Step 4 kVAr value normalized at Capacitor rated voltage.
Stp5 KVAR: Step 5 kVAr value normalized at Capacitor rated voltage.
Stp6 KVAR: Step 6 kVAr value normalized at Capacitor rated voltage.

- 17 -

PAGE: 08

Time: 10:10:00
Real Time Clock: RTC time set in the SPF-25 is displayed here. Its in
HH:MM:SS format.

PAGE: 09

Date: 07:11:06
Real Time Clock: RTC date set in the SPF-25 is displayed here. Its in
dd:mm:yy format.

PAGE: 10

SPF-25 1.0.6

SPF-25 internal firmware version number is displayed here. (Just for user
information)

Total number of Main display pages are 11nos ranging from “00” to
“10”.

- 18 -

Method for Keyboard/Display usage.

Flow chart for entering into different modes:

PRESS
Enable

Default
Display
mode

If Password
Option is
Enable/Disable.

Disable

Enter Pwd: ****
PRESS
Enter the 4
Digit password
By use of
L, R, UP & DN
Keys.

PRESS

NO

IF
PASSWORD
Correct?

*

YES
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

1.Edit Mode

2.Auto Mode

3.Manual Mode

- 19 -

Parameter Editing Submenu Level 1:

*
1.General
2.System
3.Fault
4.Step
5.Communication

Sub-menu
Level 1
for
Parameter
Editing.

Parameter Editing
Sub-Menu
LEVEL 2

1.General and IO: Parameters related with general function and Input/Output
2. System: Electrical system (Mains supply) related parameters.

3. Fault: Setting Faults and fault levels.
4. Step: Capacitor Steps related parameters.
5. Communication: Parameters related with communication and data logging.

- 20 -

Parameter Editing Method:
(For Submenu Level 2 : L2)

Sub-Menu Level 1.
Cursor Blinking
at Parameter Values.

1.Submenu L2: ****

1.Submenu L2: ****
PRESS

key to increment value.

PRESS

Key to decrement value.

PRESS

Key to shift cursor Left.

PRESS

Key to shift cursor Right.
2.Submenu L2: ****

2.Submenu L2: ****
PRESS

key to increment value.

PRESS

Key to decrement value.

PRESS

Key to shift cursor Left.

PRESS

Key to shift cursor Right.

3.Submenu L2: ****

Exit: No Save

Exit: No Save

Without saving

Default
Display.

With saving

Screen for 1second

Saving In EEProm

Exit: With Save

- 21 -

Parameter Editing Submenu Level 2:
Menu
General

Parameter
Pwd
Ch-Pwd
Ld Def
THD
Rst. Energy

Meaning of Parameter
Password Control
Password value
Load all factory default parameters.
Type of THD factor to be displayed
Energy Counters reset to zero option

Default
Enable
1111
No
F-THD
No

Menu
System

Parameter
Meas. Vol.
Ld. Cur. Pr.
Cap. Cur. Pr.
PF Target
PF Target
Auto Sync
Async Tol.
Reset Async

Meaning of Parameter
Default
SPF-25 rated measurement voltage
440
Primary current value of mains CT
0180
0075
Primary current value of capacitor CT
Target PF for deciding Lag or Lead
Lag
1.00
Target PF exact value
Automatic synchronisation requirement Yes
% load variation tolerence for Auto-sync. 30
No
Reset Auto-sync to default value.

Menu
Fault

Parameter
Over Vol.
Over Vol. Lim
Over Vol. Clr
Under Vol.
Under Vol. Lim
Under Vol. Clr
Over Load
Over Ld. Lim
Over Ld. Clr
Under Ld.
Under Ld. Lim
Under Ld. Clr
Ld. Unbalance
Ld. Unb. Lim
Over CC
Over CC. Lim
Over CC. Clr
Over CC. Rst.
Over CC. Rst.
Under CC.
Under CC. Lim
Under CC. CLr
CC THD
CC THD Lim
CC THD Clr
Step Check
Cap. Cur Tol
Under Comp.
RTC Bat

Meaning of Parameter
Default
Over Voltage Fault: action by PDE-30 Off Step
Over Voltage activation limit value
1.10
Over Voltage resumption limit value 1.05
Under Voltage Fault: Action?
Off Step
Under Voltage activation limit value 0.70
Under Voltage resumption limit value 0.75
Over Load Fault: Action?
Indicate
Mains current over load limit value
1.30
Mains cur. over load resume value
1.25
Under Load on Mains: Action?
Indicate
Under load Activation limit value
0.03
Under load Resumption limit value
0.05
Load Un-balance Fault: Action?
Off Step
Load Un-balance limit
025%
Capacitor Over Current Fault: Action? Disable
Cap. Over Current Limit value.
1.30
Cap. Over Current Resume value.
1.25
Auto reset feature on Cap. Over Cur. No
If Over CC. Rst.=Yes. Time for reset. 120 sec
Under Capacitor current fault: Action? Disable
Under Cap. Cur. Limit value.
0.95
Under Cap. Cur. Resume value.
0.97
Capacitor current Over THD: Action? Disable
Cap.Cur. Over THD limit value.
0.10
Cap.Cur. Over THD resume value.
0.08
Every step kVAr healthiness monitor. Disable
Step kVAr healthiness: tolerence.
0.10
Out of Banks Indication.
Disable
RTC Battery fault monitoring.
Enable

- 22 -

Min
Disable
0000
No
R-THD
No
Min
Non
0001
0001
Lead
0.70Lag
No
01
No

Min

Max
Enable
9999
Yes
F-THD
Yes
Max
Edible
9999
9999
Lag
0.85Lead
Yes
50
Yes

Max

Disable, Indicative, Off Step

0.90
0.85

1.20
1.15

Disable, Indicative, Off Step

0.70
0.75

0.95
1.00

Disable, Indicative, Off Step

1.10
1.05

1.30
1.25

Disable, Indicative, Off Step

0.01
0.02

0.20
0.25

Disable, Indicative, Off Step

005%

100%

Disable, Indicative, Off Step

1.05
1.00
No
15

1.50
1.45
Yes
900

Disable, Indicative, Off Step

0.75
0.80

0.98
1.00

Disable, Indicative, Off Step

0.02
0.01
Disable
0.03
Disable
Disable

0.99
0.90
Enable
0.50
Enable
Enable

Menu
Step

Parameter
No. of Steps
Step Vol
Corr. Time
Discharge Time
Step 1 KVAR
Step 2 KVAR
Step 3 KVAR
Step 4 KVAR
Step 5 KVAR
Step 6 KVAR

Meaning of Parameter
Number of Capacitor steps utilised
Voltage at which kVAr is defined
Correction cycle time.
Capacitor discharge time.
Step 1 kVAr value.
Step 2 kVAr value.
Step 3 kVAr value.
Step 4 kVAr value.
Step 5 kVAr value.
Step 6 kVAr value.

Menu
Parameter
Meaning of Parameter
Communication Unit ID
Communication ID of the unit
Baud Rate
Serial communication baud rate.
Time
RTC time to be set
Date
RTC date to be set
Init RTC
Initialise RTC?
Clear NVRAM Clear all contents on NV RAM?

Default
3
440
120 secs
120 secs
006
009
018
018
018
018

Min
1
380
010
010
001
001
001
001
001
001

Default
3001
09600
--No
No

Min
0000
04800
--No
No

Max
6
660
240
240
250
250
250
250
250
250

Max
9999
38400
--Yes
Yes

Note that all the parameters in the Sub-Menu Level 2 should be carefully filled in the
SPF-25. Failing to put the correct parameters can make SPF-25 to malfunction.
Its therefore advised that a trained person should only be allowed to change these
values.

- 23 -

Commissioning Instructions :
before panel is powered up for the first time.
1. Panel Wiring Check
Ensure that all connections in the panel is tightened properly and there are no
loose connections. Also ensure that the wiring is done as per the wiring
diagram.
2. Power Wiring Check
Ensure that the power cables are connected properly from the Panel I/C to the
feeder I/C or the transformer bushings. The connection has to be after the
Load Feed back CT looking from the Transformer side.
Ensure that the Bus Bars and/or Lugs are clean and free of Dust, Corrosion or
Oxidation on the contact sides so that good electrical connection is maintained.
The surface area should be flat so as to get maximum contact area.
If required Clean the Bus Bars and/ or Lugs by rubbing it with Polish Paper to
remove the oxidation layer. Provide contact paste in between the contacts
surfaces.
Not performing this, can result in to a weaker source point for Capacitor
charging during Step on and this can generate undesirable Noise which can
hamper the performance of equipments installed in the capacitor panel.
3. Load Feed Back CT connection.
Ensure that the load feed back CT connections are done properly. Confirm that
correct phase CT is connected with the correct phase input terminals. (Even
though auto sync is capable of taking care of wrong CT polarities or CT
position interchanging, but then on display, the Phase readings may be seen to
be interchanged. (May be R-phase reading would be seen in B-phase and
vice-versa.
CT connections to be done carefully so as to ensure that the wire does not get
open and there is no loose connection.

Loose connection’s or open CT secondary can result in to very high voltages
getting developed in the circuit which can damage the CT and also produce
high levels of noise in the system.

- 24 -

Fault Finding Guidelines :

Fault Type

Probable Reason

Action to Take

Unit Does not
turn ON. No
display on LCD.

•Input auxiliary supply
not coming.
•Input side fuses
blown

•Check the input
supply to restore
•Check fuses in the
unit for OK.

Unit does not
turn On any
capacitors even
if PF is below
Lower PF limit.

•If auto-sync failure
message is there at
Power On.

• Load may be highly
fluctuating so need of
manual
synchronisation only.
• This is OK
condition.

• The load KW is too
low with Under load
fault enable condition.
•Control connections
from SPF-25 to
contactor coils are not
proper

•Check control supply
and connections from
SPF-25 to contactors.

BF indication on
Default display.

• Internal Ni-Cd
3.2Vdc battery used
for RTC and NV RAM
must be drained down.

• Replace this battery
in consultancy with
TAS trained
personnel.

Some Capacitor
banks are
declared as
faulty even if
they are
checked to be
OK.

•Individual step health
monitoring is enabled
and tolerance limits
set are too stringent.
• Capacitor current
THD factor is
continuously
fluctuating.

•Set the tolerance
limits for individual
steps monitoring as
relaxed.
• With continuously
fluctuating THD of
Capacitor current and
higher level of THD
can cause some
errors in individual
step KVAR
measurement. Under
this condition, best is
to keep this feature
disabled.

- 25 -

Fault Finding Guidelines (continued):

Fault Type

Probable Reason

Action to Take

Serial
Communication
is not working.

• Baud rate selection
is not proper.
• Unit ID is not set
properly.
• Serial
communication cable
connections are not
proper.

• Select proper baud
rate.
• Set the unit ID
correctly.
• Check the serial
cable continuity as
per the connections
given earlier in this
manual.

Data logging is
not taking place.

• Possible that RTC
date is not set
properly.

• Change the battery
by help of TAS’s
authorised person.

SPF-25 resets
occasionally on
turning OFF of
any contactor.

• The contactor supply
phase may be the
same as used for SPF25 auxiliary supply.
• RC snubbers/ free
wheeling diodes are
not put with contactor
coils.

• Use the different
phase for control
supply of contactors
and for SPF-25 supply
• Usage of RC
snubbers / free
wheeling diodes is
mandatory.

- 26 -

Corporate Office/Works/Design Centre:
W-61, MIDC, Ambad, Nasik - 422010, Maharashtra (India)
Tel: +91-(253)-2384038 / 2381090
Email: [email protected]
Marketing and After-Sales Service:
A/58, Kamal Pushpa, K.C. Road, Bandra, Mumbai-400050.
Tel: +91-9930513923
Email: [email protected]
Regional Office: Delhi
191-B, Ground Floor, Padam Nagar (Filter Market),
New Delhi - 110007 (India).
Tel: +91-9911615701
Email: [email protected]


Slide 4

Operations Manual
SPF-25/6
AUTOMATIC POWER FACTOR
CONTROLLER

TAS Powertek Pvt. Ltd.
Corporate Office:
W-61, MIDC, Ambad, Nasik - 422010, Maharashtra (India)
Tel: +91-(253)-2384038 / 2381090
Email: [email protected]

NOTE
These instructions do not purport to cover all details or
variations in equipment, nor to provide for every possible
contingency to be met in connection with installation,
operation or maintenance.

Should further information be desired or should particular
problems arise which are not covered sufficiently for the
purchasers purposes, the matter should be referred to our
TAS Powertek Pvt. Ltd., office.
The contents of this instruction Manual shall not become
part of or modify any prior or existing agreement or
relationship. The sales contract contains the entire
obligations of TAS Powertek Pvt. Ltd. The warranty
contained in the contract between the parties is the sole
warranty of TAS Powertek Pvt. Ltd. Any statements
contained herein do not create new warranties or modify the
existing warranty.

The reproduction, transmission or use of this
document or its contents is not permitted
without express written authority. Offenders
will be liable for damages. All rights are
reserved.

Index
Index Page
-----------------Features & Specifications
----------Mechanical Dimensions/ mounting --------Functional Block diagram
-----------------PF correction technique
-----------------Back Side terminals
-----------------------Typical wiring scheme ---------------------Front Facia
---------------------------------Communication connector connections ----Display of various parameters / Status ---Method of Keyboard/Display usage -------Parameter Submenu -----------------------Commissioning Instruction (before Powerup)
Fault finding Guidelines ---------------------

-1-

1
2
3
4
5
6
7
8
9
10
19
22
24
25

Features:
• Totally Micro-processor controlled Digital Signal processing
logic for measurements.
• All measurements with 1.0 class accuracy.
• Automatic Synchronisation capable of giving the correct
results for wrong connections at CT terminals (even wrong
polarity of CTs).
• Measurement and kVAr compensation are frequency / THD
compensated.
• Load V,Iph, In and Cap. current THD measurement.
• Up-to 6 output banks control.
• Capable of doing the kVAr measurements on basis of mean
of the correction cycle time and provide kVAr compensation.
• Standard 144 X 144 cabinet for panel door flush mounting.
• Serial communication through standard TAS protocols.
• Manual testing mode for user checking of the Capacitor steps
switching.
• Protections provided (user settable):
Over/under Voltage
Cap. Over/under current / THD.
Over/Under frequency (internally set limits)
Over / Under load.
Load unbalance.
Capacitor individual step kVAr monitoring.
Out of steps: Under-compensation (only for indication)
NV-RAM battery down.
• Data logging for various parameters for 2months period at an
interval of 1hr.
• Unit comes along with PC (Windows compatible) software
for downloading and viewing the logged data.

Specifications:
•
•
•
•
•
•
•
•
•
•
•
•

Feed-back Voltage:440Volt (+10%/-30%)
Current input : 1Amp for load and capacitor feed-back.
Measurement Accuracy: Class 1.0
Auxiliary Supply: 525Vac to 300Vac.
Correction / Discharge time:
Selectable in seconds from 10sec. to 240sec.
Output commands:
NO contacts each with current rating of 0.5Amp AC. at
240Vac.
RS-232 baud rate selectable from 4.8kBPS to 38.4kBPS.
Operating temperature: 0 to 55oC.
1.0class measurement Operating temperature: 0 to 50oC.
Storage temperature: -10 to +75oC.
Humidity: 0 to 98%.
Supply frequency: 45Hz to 55Hz.

-2-

Mechanical Dimensions:
135

144

135

120
144

6

Recommended size for cutout on panel door is 138 X 138.
All Dimensions given are in mm.

Maximum weight: (with clamps and terminals) = 2.5kg.

-3-

Functional Block Diagram:
3 channel
Current f.b.

3
Channel
Cap.
Current
f.b.

3 channel
Voltage f.b.

SPF-25

V, I, PF and Power
Measurement
Block
For every AC mains
Cycle.

Calculation
Block for
• Energy Parameters
• Harmonic analysis

EEPROM
For Data
Logging

Keyboard,
Display and
Other support
Functions
Block.

RS-232 Serial
Communication.
TAS-01
Protocol stack.

Power Factor
Correction Block
+ event monitoring.

Outputs Commands
For Capacitor
Switching.

Power Supply
Block.

Above block diagram gives the functional blocks that are built into SPF-25 PF
correction relay.
These blocks are made up with the combination of functions from hardware and
corresponding firmware that resides in the Program memory of the micro-processor
used therein.
Even though the basic blocks exists as shown in the diagram, there functionality is
interdependent. The entire combination is carefully designed so as to have
minimum effects of Electrical and Electromagnetic noise level on the functionality of
this SPF-25.
The firmware written takes into various error handling eventualities so that the
functioning of this PF relay is error free and highly reliable.

-4-

PF correction technique:
KVAr Inductive

Target
PF.
Cos Φ
= PF

1.5 X kVAr
Of Smallest
Capacitor bank

KW

No change band.
KVAr Capacitive
Capacitor Addition band.
Capacitor Removal band.
SPF-25 for kVAr compensation works with the kW v/s kVAr diagram as shown here
above.
A band is created across the target PF value. (Target PF is set by user). This band
is of +0.75 of the smallest capacitor bank kVAr. Thus, total band width is always 1.5
times the smallest capacitor bank kVAr used. This is a no change band. If the
mains source parameters are within this band, SPF-25 would not change the
capacitors bank status.
If the mains parameters are out of this “No change band”, then SPF-25 calculates
the correct capacitor bank combination to be added / subtracted and within one
correction cycle brings it within the No change band.
The no change band width is selected as mentioned because it has to prevent unnecessary hunting (switching on/off) of the capacitor banks.

-5-

Back Side terminals:

Voltage
Feed-Back

Auxiliary
Supply

Current
Feed-Back
Output commands.

-6-

Capacitor
Current
Feed-Back

Typical Wiring with SPF-25 PF correction system.
L
O
A
D

L
C
R
+

L
C
R
-

L
C
Y
+

L
C
Y
-

L
C
B
+

L
C
B
-

PH 3
PH 2
PH 1
CCR+
CCRCCY+
CCYCCB+
CCB-

S
P
F
2
5

Auxiliary
Supply

L1
L2

Com
C01
C02
|

C06

Mains Connections:
Phase 1 control:
Neutral control:
Commands:
Load Current CT:
Capacitor Current CT:

-7-

Front Facia of SPF-25:
LCD Display

Step status LED indication
Serial Communication Port

Membrane Keypad

Usage of the UP and DN key makes the LCD display to scroll up
and down. This is used for display of various status as well as for
viewing the On line measured electrical values.
These keys are also used for changing values in Parameters
Editing mode and used for status changing of banks in Manual
mode.
Usage of ENT key is for entering the submenu and / or for setting
up some values.
The L and R keys are used in changing the position of the cursor
from Left to Right and vice-versa.

-8-

RS-232 serial communication 9 pin D connector:

5

4

6

3

7

2

8

1

9
RXD

GND

TXD

RS-232 cable connection Details:

PIN
NO

PC side
Connection

CONNECTION

SPF-25

1

NC

2

RXD

TXD

3

TXD

RXD

GND

GND

4
5
6
7
8
9

NC

-9-

Display of Various Parameters / Status:
PAGE: 00

COSΦ= -0.99 A OK

This is default display screen giving
information on PF, mode and
working status.

COSΦ= -0.99 :This part of the display indicates the Power Factor running value. The
sign –ve indicates that PF is Capacitive and no sign (+ve) indicates that PF is Inductive.
The PF indicated is the overall PF of the three phase system.
A or M :
This part either indicates the letter “A” or letter “M”. The letter A means
that SPF-25 is working in Auto mode.
The letter M means that SPF-25 is presently in Manual mode.
The Auto or Manual modes can be selected by pressing ENT key on this page.
(If Password option is enabled, enter the same by using UP/DN/L/R keys and then
Pressing ENT)
Then by UP or DN key you can stroll between the displays:
“1. Edit Mode”, “2. Auto Mode”, “3.Manual Mode”.
The first one “1.Edit Mode” is for parameter changing. The details of parameter changing
are explained in detail in later part of this manual.
The second and third one as display indicates are for selecting Auto or Manual mode
respectively. The ENT key pressed on selecting the mode desired, puts the SPF-25 into
that mode.
Auto Mode: In this mode SPF-25 works in automatic mode. It switches the capacitor
banks automatically depending on the parameter setting of target PF. This mode is the
default mode and is to be used for unmanned operation of the system controlled by
SPF-25.
Manual Mode: This mode is activated for checking/testing the capacitor banks switching.
Its also used for changing the Masking status of the capacitor banks. More on this is
explained later. (On Page 01 explanation)
OK or ** :
The last part of the display that is blinking every 500mS indicates the
working status of SPF-25. “OK” indicates that unit is working fine without any trip
conditions. If there is other indication, the meaning of the same can be as:
OK
:
No Fault
OC
:
Over Capacitor Current
UC
:
Under Capacitor Current
OL
:
Over Load
UL
:
Under Load
OV
:
Over Voltage
UV
:
Under Voltage
OF
:
Over Frequency
UF
:
Under Frequency
OH
:
Over Capacitor Current THD %.
OB
:
Out of Banks
LU
:
Load Unbalance
BF
:
Battery Failure (RTC)
NV
:
NVRAM Checksum Error
VA
:
Voltage Absent
- 10 -

PAGE: 01

PAGE: 01

______

AUTO

______

MAN

This display indicates the Bank status in Auto mode and in Manual mode it helps
to make the specific bank On or Off or declare masked.
: Means Bank is On.
: Means Bank is Off.
: Means Bank is Off and is declared masked (out of action)
: Means Bank does not exist for compensation.
When the Page 01 is in Auto mode, its only for indication of Bank status.
But in Manual mode, the “ENT” key press activates the manual control
mode. The cursor over the bank number starts blinking. The UP and DN
keys can turn On and Off the respective bank.
The DN key pressed puts the respective bank in Masking mode and another
press of DN key brings it out of Masking mode.

Putting the bank masking status permanently:
If a bank is to be permanently put in masked mode or is to be brought out of
permanent masked mode, it can be done by bringing the blinking cursor on
the position of the respective bank by use of L or R key. Then by pressing
DN key, bring the status of the bank to the required level (Masked or
Unmasked). Then press ENT key so that cursor stops blinking. After that by
pressing UP key go to Page 00. Then Press ENT. (If Password option is
enabled, enter the same by using UP/DN/L/R keys and then Press ENT)
“1.EDIT MODE” would be displayed. Press ENT one more time. “1.General
and IO” would be displayed. Press ENT again. “Pwd : Disable” or “Pwd :
Enable” would be displayed. Press UP key. “Exit: No Save” would be
displayed. Press ENT so that cursor will start blinking. Press UP. “Exit: With
Save” would be displayed with cursor blinking. Press ENT. “Saving in
EEPROM” would be displayed for a short time and then Page 00 would be
displayed.
You will observe that the bank status as requirement is changed
permanently to the status desired.

- 11 -

PAGE: 02

1.Overall Values
PRESS
PAGE: 02.1

Avg Vol: 415.7 V
PAGE: 02.2

Avg Cur: 0123.4A
PAGE: 02.3

Tot KW:

0081.2

PAGE: 02.4

TotKVAR: 0024.6
PAGE: 02.5

Tot KVA: 0101.1
PAGE: 02.6

Avg CC:

0031.3A

PAGE: 02.7

CKVAR:

028.35

PAGE: 02.8

LS PF:

0.82

PAGE: 02.9

LS KVAR: 0043.9
PAGE: 02.10

LS KVA:

0125.7

PAGE: 02.11

Freq:

49.9Hz

The Overall values Display menu has submenus as displayed above. As its
self explanatory it means:
Avg Vol: Average voltage of all the three line to line voltage values.
Avg Cur: Average current of all the three phase line current values.
Tot KW: Overall kW of the three phase system measured at source.
TotKVAR: Overall kVAr of the three phase system measured at source.
Tot KVA: Overall kVA of the three phase system measured at source.
Avg CC: Average of three phase current through capacitor panel.
CKVAR: Capacitive kVAr that is compensated by the system.
LS PF: Load side PF. (PF value if not compensated.
LS KVAR: Load side kVAr.
LS KVA: Load side kVA.
Freq: Supply frequency in Hz.
- 12 -

PAGE: 03

2.Per-Phase RMS

PRESS
PAGE: 03.1

R-Y Vol: 415.7 V
PAGE: 03.2

Y-B Vol: 415.7 V
PAGE: 03.3

B-R Vol: 415.7 V
PAGE: 03.4

Rph Cur: 0110.8A
PAGE: 03.5

Yph Cur: 0110.8A
PAGE: 03.6

Bph Cur: 0110.8A
PAGE: 03.7

Neutral: 0010.2A
PAGE: 03.8

Rph Cap: 0022.5A
PAGE: 03.9

Yph Cap: 0022.5A
PAGE: 03.10

Bph Cap: 0022.5A

Per Phase RMS: Submenu:
R-Y Vol: Measured AC Voltage RMS value across R and Y phase.
Y-B Vol: Measured AC Voltage RMS value across Y and B phase.
B-R Vol: Measured AC Voltage RMS value across B and R phase.
Rph Cur: Line current RMS value in R phase. Mains source.
Yph Cur: Line current RMS value in Y phase. Mains source.
Bph Cur: Line current RMS value in B phase. Mains source.
Neutral: Neutral current RMS value.
Rph Cap: Capacitor current RMS value in R phase.
Yph Cap: Capacitor current RMS value in Y phase.
Bph Cap: Capacitor current RMS value in B phase.

- 13 -

PAGE: 04

3.Power
PRESS
PAGE: 04.1

Rph PF:

PAGE: 04.10

1.00

Rph KVA: 0109.7

PAGE: 04.2

Yph PF:

PAGE: 04.11

1.00

Yph KVA: 0109.7

PAGE: 04.3

Bph PF:

PAGE: 04.12

1.00

Bph KVA: 0109.7

PAGE: 04.4

Rph KW:

PAGE: 04.13

0100.2

RphCKVAR: 010.76

PAGE: 04.5

Yph KW:

PAGE: 04.14

0100.2

YphCKVAR: 010.76

PAGE: 04.6

Bph KW:

PAGE: 04.15

0100.2

BphCKVAR: 010.76

PAGE: 04.7

PAGE: 04.16

RphKVAR: 0020.4

Rph mF

PAGE: 04.8

: 165.06

PAGE: 04.17

YphKVAR: 0020.4

Yph mF

PAGE: 04.9

: 165.06

PAGE: 04.18

BphKVAR: 0020.4

Bph mF

: 165.06

Power: Submenu:
Rph PF: Power Factor of R phase on mains source.
Yph PF: Power Factor of Y phase on mains source.
Bph PF: Power Factor of B phase on mains source.
Rph kW: Active Power in kW in R-phase.
Yph kW: Active Power in kW in Y-phase.
Bph kW: Active Power in kW in B-phase.
RphkVAR: Reactive Power in kVAr in R-phase.
YphkVAR: Reactive Power in kVAr in Y-phase.
BphkVAR: Reactive Power in kVAr in B-phase.
Rph KVA: Apparent Power in kVA in R-phase.
Yph KVA: Apparent Power in kVA in Y-phase.
Bph KVA: Apparent Power in kVA in B-phase.
RphCKVAR: Capacitor injected reactive power in R-phase.
YphCKVAR: Capacitor injected reactive power in Y-phase.
BphCKVAR: Capacitor injected reactive power in B-phase.
Rph mF: Capacitor value in micro-farad in R-phase.
Yph mF: Capacitor value in micro-farad in Y-phase.
Bph mF: Capacitor value in micro-farad in B-phase.
- 14 -

PAGE: 05

4.Energy
PRESS
PAGE: 05.1

KWH:

1234567.8

PAGE: 05.2

IndKVARH:12345.6
PAGE: 05.3

CapKVARH:12345.6
PAGE: 05.4

KVAH:

1234567.8

PAGE: 05.5

CKVARH:1234567.8

Energy: Submenu:
KWH: Overall cumulative active energy in kWh on Mains supply.
IndKVARH: Inductive reactive energy in kVArh on Mains supply.
CapKVARH: Capacitive reactive energy in kVArh on Mains supply.
KVAH: Overall cumulative apparent energy in kVA on Mains supply.
CKVARH: Capacitor compensated reactive energy in kVArh.

- 15 -

PAGE: 06

5.Harmonics
PRESS
PAGE: 06.1

Vr-THD-F: 002.4%
PAGE: 06.2

Vy-THD-F: 002.4%
PAGE: 06.3

Vb-THD-F: 002.4%
PAGE: 06.4

Ir-THD-F: 012.5%
PAGE: 06.5

Iy-THD-F: 012.5%
PAGE: 06.6

Ib-THD-F: 012.5%
PAGE: 06.7

In-THD-F: 005.0%
PAGE: 06.8

CCr-THD-F:028.2%
PAGE: 06.9

CCy-THD-F:028.2%
PAGE: 06.10

CCb-THD-F:028.2%

Harmonics: Submenu:
Vr-THD-F/R: R-Y line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Vy-THD-F/R: Y-B line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Vb-THD-F/R: B-R line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Ir-THD-F/R: R phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Iy-THD-F/R: Y phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Ib-THD-F/R: B phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
In-THD-F/R: Neutral current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
CCr-THD-F/R: R phase Capacitor current % Total Harmonic Distortion.
CCy-THD-F/R: Y phase Capacitor current % Total Harmonic Distortion.
CCb-THD-F/R: B phase Capacitor current % Total Harmonic Distortion.

- 16 -

PAGE: 07

6.Step KVAR
PRESS
PAGE: 07.1

Stp1 KVAR:0009.0
PAGE: 07.2

Stp2 KVAR:0009.0
PAGE: 07.3

Stp3 KVAR:0009.0
PAGE: 07.4

Stp4 KVAR:0009.0
PAGE: 07.5

Stp5 KVAR:0009.0
PAGE: 07.6

Stp6 KVAR:0009.0

Step KVAR: Submenu:
Stp1 KVAR: Step 1 kVAr value normalized at Capacitor rated voltage.
Stp2 KVAR: Step 2 kVAr value normalized at Capacitor rated voltage.
Stp3 KVAR: Step 3 kVAr value normalized at Capacitor rated voltage.
Stp4 KVAR: Step 4 kVAr value normalized at Capacitor rated voltage.
Stp5 KVAR: Step 5 kVAr value normalized at Capacitor rated voltage.
Stp6 KVAR: Step 6 kVAr value normalized at Capacitor rated voltage.

- 17 -

PAGE: 08

Time: 10:10:00
Real Time Clock: RTC time set in the SPF-25 is displayed here. Its in
HH:MM:SS format.

PAGE: 09

Date: 07:11:06
Real Time Clock: RTC date set in the SPF-25 is displayed here. Its in
dd:mm:yy format.

PAGE: 10

SPF-25 1.0.6

SPF-25 internal firmware version number is displayed here. (Just for user
information)

Total number of Main display pages are 11nos ranging from “00” to
“10”.

- 18 -

Method for Keyboard/Display usage.

Flow chart for entering into different modes:

PRESS
Enable

Default
Display
mode

If Password
Option is
Enable/Disable.

Disable

Enter Pwd: ****
PRESS
Enter the 4
Digit password
By use of
L, R, UP & DN
Keys.

PRESS

NO

IF
PASSWORD
Correct?

*

YES
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

1.Edit Mode

2.Auto Mode

3.Manual Mode

- 19 -

Parameter Editing Submenu Level 1:

*
1.General
2.System
3.Fault
4.Step
5.Communication

Sub-menu
Level 1
for
Parameter
Editing.

Parameter Editing
Sub-Menu
LEVEL 2

1.General and IO: Parameters related with general function and Input/Output
2. System: Electrical system (Mains supply) related parameters.

3. Fault: Setting Faults and fault levels.
4. Step: Capacitor Steps related parameters.
5. Communication: Parameters related with communication and data logging.

- 20 -

Parameter Editing Method:
(For Submenu Level 2 : L2)

Sub-Menu Level 1.
Cursor Blinking
at Parameter Values.

1.Submenu L2: ****

1.Submenu L2: ****
PRESS

key to increment value.

PRESS

Key to decrement value.

PRESS

Key to shift cursor Left.

PRESS

Key to shift cursor Right.
2.Submenu L2: ****

2.Submenu L2: ****
PRESS

key to increment value.

PRESS

Key to decrement value.

PRESS

Key to shift cursor Left.

PRESS

Key to shift cursor Right.

3.Submenu L2: ****

Exit: No Save

Exit: No Save

Without saving

Default
Display.

With saving

Screen for 1second

Saving In EEProm

Exit: With Save

- 21 -

Parameter Editing Submenu Level 2:
Menu
General

Parameter
Pwd
Ch-Pwd
Ld Def
THD
Rst. Energy

Meaning of Parameter
Password Control
Password value
Load all factory default parameters.
Type of THD factor to be displayed
Energy Counters reset to zero option

Default
Enable
1111
No
F-THD
No

Menu
System

Parameter
Meas. Vol.
Ld. Cur. Pr.
Cap. Cur. Pr.
PF Target
PF Target
Auto Sync
Async Tol.
Reset Async

Meaning of Parameter
Default
SPF-25 rated measurement voltage
440
Primary current value of mains CT
0180
0075
Primary current value of capacitor CT
Target PF for deciding Lag or Lead
Lag
1.00
Target PF exact value
Automatic synchronisation requirement Yes
% load variation tolerence for Auto-sync. 30
No
Reset Auto-sync to default value.

Menu
Fault

Parameter
Over Vol.
Over Vol. Lim
Over Vol. Clr
Under Vol.
Under Vol. Lim
Under Vol. Clr
Over Load
Over Ld. Lim
Over Ld. Clr
Under Ld.
Under Ld. Lim
Under Ld. Clr
Ld. Unbalance
Ld. Unb. Lim
Over CC
Over CC. Lim
Over CC. Clr
Over CC. Rst.
Over CC. Rst.
Under CC.
Under CC. Lim
Under CC. CLr
CC THD
CC THD Lim
CC THD Clr
Step Check
Cap. Cur Tol
Under Comp.
RTC Bat

Meaning of Parameter
Default
Over Voltage Fault: action by PDE-30 Off Step
Over Voltage activation limit value
1.10
Over Voltage resumption limit value 1.05
Under Voltage Fault: Action?
Off Step
Under Voltage activation limit value 0.70
Under Voltage resumption limit value 0.75
Over Load Fault: Action?
Indicate
Mains current over load limit value
1.30
Mains cur. over load resume value
1.25
Under Load on Mains: Action?
Indicate
Under load Activation limit value
0.03
Under load Resumption limit value
0.05
Load Un-balance Fault: Action?
Off Step
Load Un-balance limit
025%
Capacitor Over Current Fault: Action? Disable
Cap. Over Current Limit value.
1.30
Cap. Over Current Resume value.
1.25
Auto reset feature on Cap. Over Cur. No
If Over CC. Rst.=Yes. Time for reset. 120 sec
Under Capacitor current fault: Action? Disable
Under Cap. Cur. Limit value.
0.95
Under Cap. Cur. Resume value.
0.97
Capacitor current Over THD: Action? Disable
Cap.Cur. Over THD limit value.
0.10
Cap.Cur. Over THD resume value.
0.08
Every step kVAr healthiness monitor. Disable
Step kVAr healthiness: tolerence.
0.10
Out of Banks Indication.
Disable
RTC Battery fault monitoring.
Enable

- 22 -

Min
Disable
0000
No
R-THD
No
Min
Non
0001
0001
Lead
0.70Lag
No
01
No

Min

Max
Enable
9999
Yes
F-THD
Yes
Max
Edible
9999
9999
Lag
0.85Lead
Yes
50
Yes

Max

Disable, Indicative, Off Step

0.90
0.85

1.20
1.15

Disable, Indicative, Off Step

0.70
0.75

0.95
1.00

Disable, Indicative, Off Step

1.10
1.05

1.30
1.25

Disable, Indicative, Off Step

0.01
0.02

0.20
0.25

Disable, Indicative, Off Step

005%

100%

Disable, Indicative, Off Step

1.05
1.00
No
15

1.50
1.45
Yes
900

Disable, Indicative, Off Step

0.75
0.80

0.98
1.00

Disable, Indicative, Off Step

0.02
0.01
Disable
0.03
Disable
Disable

0.99
0.90
Enable
0.50
Enable
Enable

Menu
Step

Parameter
No. of Steps
Step Vol
Corr. Time
Discharge Time
Step 1 KVAR
Step 2 KVAR
Step 3 KVAR
Step 4 KVAR
Step 5 KVAR
Step 6 KVAR

Meaning of Parameter
Number of Capacitor steps utilised
Voltage at which kVAr is defined
Correction cycle time.
Capacitor discharge time.
Step 1 kVAr value.
Step 2 kVAr value.
Step 3 kVAr value.
Step 4 kVAr value.
Step 5 kVAr value.
Step 6 kVAr value.

Menu
Parameter
Meaning of Parameter
Communication Unit ID
Communication ID of the unit
Baud Rate
Serial communication baud rate.
Time
RTC time to be set
Date
RTC date to be set
Init RTC
Initialise RTC?
Clear NVRAM Clear all contents on NV RAM?

Default
3
440
120 secs
120 secs
006
009
018
018
018
018

Min
1
380
010
010
001
001
001
001
001
001

Default
3001
09600
--No
No

Min
0000
04800
--No
No

Max
6
660
240
240
250
250
250
250
250
250

Max
9999
38400
--Yes
Yes

Note that all the parameters in the Sub-Menu Level 2 should be carefully filled in the
SPF-25. Failing to put the correct parameters can make SPF-25 to malfunction.
Its therefore advised that a trained person should only be allowed to change these
values.

- 23 -

Commissioning Instructions :
before panel is powered up for the first time.
1. Panel Wiring Check
Ensure that all connections in the panel is tightened properly and there are no
loose connections. Also ensure that the wiring is done as per the wiring
diagram.
2. Power Wiring Check
Ensure that the power cables are connected properly from the Panel I/C to the
feeder I/C or the transformer bushings. The connection has to be after the
Load Feed back CT looking from the Transformer side.
Ensure that the Bus Bars and/or Lugs are clean and free of Dust, Corrosion or
Oxidation on the contact sides so that good electrical connection is maintained.
The surface area should be flat so as to get maximum contact area.
If required Clean the Bus Bars and/ or Lugs by rubbing it with Polish Paper to
remove the oxidation layer. Provide contact paste in between the contacts
surfaces.
Not performing this, can result in to a weaker source point for Capacitor
charging during Step on and this can generate undesirable Noise which can
hamper the performance of equipments installed in the capacitor panel.
3. Load Feed Back CT connection.
Ensure that the load feed back CT connections are done properly. Confirm that
correct phase CT is connected with the correct phase input terminals. (Even
though auto sync is capable of taking care of wrong CT polarities or CT
position interchanging, but then on display, the Phase readings may be seen to
be interchanged. (May be R-phase reading would be seen in B-phase and
vice-versa.
CT connections to be done carefully so as to ensure that the wire does not get
open and there is no loose connection.

Loose connection’s or open CT secondary can result in to very high voltages
getting developed in the circuit which can damage the CT and also produce
high levels of noise in the system.

- 24 -

Fault Finding Guidelines :

Fault Type

Probable Reason

Action to Take

Unit Does not
turn ON. No
display on LCD.

•Input auxiliary supply
not coming.
•Input side fuses
blown

•Check the input
supply to restore
•Check fuses in the
unit for OK.

Unit does not
turn On any
capacitors even
if PF is below
Lower PF limit.

•If auto-sync failure
message is there at
Power On.

• Load may be highly
fluctuating so need of
manual
synchronisation only.
• This is OK
condition.

• The load KW is too
low with Under load
fault enable condition.
•Control connections
from SPF-25 to
contactor coils are not
proper

•Check control supply
and connections from
SPF-25 to contactors.

BF indication on
Default display.

• Internal Ni-Cd
3.2Vdc battery used
for RTC and NV RAM
must be drained down.

• Replace this battery
in consultancy with
TAS trained
personnel.

Some Capacitor
banks are
declared as
faulty even if
they are
checked to be
OK.

•Individual step health
monitoring is enabled
and tolerance limits
set are too stringent.
• Capacitor current
THD factor is
continuously
fluctuating.

•Set the tolerance
limits for individual
steps monitoring as
relaxed.
• With continuously
fluctuating THD of
Capacitor current and
higher level of THD
can cause some
errors in individual
step KVAR
measurement. Under
this condition, best is
to keep this feature
disabled.

- 25 -

Fault Finding Guidelines (continued):

Fault Type

Probable Reason

Action to Take

Serial
Communication
is not working.

• Baud rate selection
is not proper.
• Unit ID is not set
properly.
• Serial
communication cable
connections are not
proper.

• Select proper baud
rate.
• Set the unit ID
correctly.
• Check the serial
cable continuity as
per the connections
given earlier in this
manual.

Data logging is
not taking place.

• Possible that RTC
date is not set
properly.

• Change the battery
by help of TAS’s
authorised person.

SPF-25 resets
occasionally on
turning OFF of
any contactor.

• The contactor supply
phase may be the
same as used for SPF25 auxiliary supply.
• RC snubbers/ free
wheeling diodes are
not put with contactor
coils.

• Use the different
phase for control
supply of contactors
and for SPF-25 supply
• Usage of RC
snubbers / free
wheeling diodes is
mandatory.

- 26 -

Corporate Office/Works/Design Centre:
W-61, MIDC, Ambad, Nasik - 422010, Maharashtra (India)
Tel: +91-(253)-2384038 / 2381090
Email: [email protected]
Marketing and After-Sales Service:
A/58, Kamal Pushpa, K.C. Road, Bandra, Mumbai-400050.
Tel: +91-9930513923
Email: [email protected]
Regional Office: Delhi
191-B, Ground Floor, Padam Nagar (Filter Market),
New Delhi - 110007 (India).
Tel: +91-9911615701
Email: [email protected]


Slide 5

Operations Manual
SPF-25/6
AUTOMATIC POWER FACTOR
CONTROLLER

TAS Powertek Pvt. Ltd.
Corporate Office:
W-61, MIDC, Ambad, Nasik - 422010, Maharashtra (India)
Tel: +91-(253)-2384038 / 2381090
Email: [email protected]

NOTE
These instructions do not purport to cover all details or
variations in equipment, nor to provide for every possible
contingency to be met in connection with installation,
operation or maintenance.

Should further information be desired or should particular
problems arise which are not covered sufficiently for the
purchasers purposes, the matter should be referred to our
TAS Powertek Pvt. Ltd., office.
The contents of this instruction Manual shall not become
part of or modify any prior or existing agreement or
relationship. The sales contract contains the entire
obligations of TAS Powertek Pvt. Ltd. The warranty
contained in the contract between the parties is the sole
warranty of TAS Powertek Pvt. Ltd. Any statements
contained herein do not create new warranties or modify the
existing warranty.

The reproduction, transmission or use of this
document or its contents is not permitted
without express written authority. Offenders
will be liable for damages. All rights are
reserved.

Index
Index Page
-----------------Features & Specifications
----------Mechanical Dimensions/ mounting --------Functional Block diagram
-----------------PF correction technique
-----------------Back Side terminals
-----------------------Typical wiring scheme ---------------------Front Facia
---------------------------------Communication connector connections ----Display of various parameters / Status ---Method of Keyboard/Display usage -------Parameter Submenu -----------------------Commissioning Instruction (before Powerup)
Fault finding Guidelines ---------------------

-1-

1
2
3
4
5
6
7
8
9
10
19
22
24
25

Features:
• Totally Micro-processor controlled Digital Signal processing
logic for measurements.
• All measurements with 1.0 class accuracy.
• Automatic Synchronisation capable of giving the correct
results for wrong connections at CT terminals (even wrong
polarity of CTs).
• Measurement and kVAr compensation are frequency / THD
compensated.
• Load V,Iph, In and Cap. current THD measurement.
• Up-to 6 output banks control.
• Capable of doing the kVAr measurements on basis of mean
of the correction cycle time and provide kVAr compensation.
• Standard 144 X 144 cabinet for panel door flush mounting.
• Serial communication through standard TAS protocols.
• Manual testing mode for user checking of the Capacitor steps
switching.
• Protections provided (user settable):
Over/under Voltage
Cap. Over/under current / THD.
Over/Under frequency (internally set limits)
Over / Under load.
Load unbalance.
Capacitor individual step kVAr monitoring.
Out of steps: Under-compensation (only for indication)
NV-RAM battery down.
• Data logging for various parameters for 2months period at an
interval of 1hr.
• Unit comes along with PC (Windows compatible) software
for downloading and viewing the logged data.

Specifications:
•
•
•
•
•
•
•
•
•
•
•
•

Feed-back Voltage:440Volt (+10%/-30%)
Current input : 1Amp for load and capacitor feed-back.
Measurement Accuracy: Class 1.0
Auxiliary Supply: 525Vac to 300Vac.
Correction / Discharge time:
Selectable in seconds from 10sec. to 240sec.
Output commands:
NO contacts each with current rating of 0.5Amp AC. at
240Vac.
RS-232 baud rate selectable from 4.8kBPS to 38.4kBPS.
Operating temperature: 0 to 55oC.
1.0class measurement Operating temperature: 0 to 50oC.
Storage temperature: -10 to +75oC.
Humidity: 0 to 98%.
Supply frequency: 45Hz to 55Hz.

-2-

Mechanical Dimensions:
135

144

135

120
144

6

Recommended size for cutout on panel door is 138 X 138.
All Dimensions given are in mm.

Maximum weight: (with clamps and terminals) = 2.5kg.

-3-

Functional Block Diagram:
3 channel
Current f.b.

3
Channel
Cap.
Current
f.b.

3 channel
Voltage f.b.

SPF-25

V, I, PF and Power
Measurement
Block
For every AC mains
Cycle.

Calculation
Block for
• Energy Parameters
• Harmonic analysis

EEPROM
For Data
Logging

Keyboard,
Display and
Other support
Functions
Block.

RS-232 Serial
Communication.
TAS-01
Protocol stack.

Power Factor
Correction Block
+ event monitoring.

Outputs Commands
For Capacitor
Switching.

Power Supply
Block.

Above block diagram gives the functional blocks that are built into SPF-25 PF
correction relay.
These blocks are made up with the combination of functions from hardware and
corresponding firmware that resides in the Program memory of the micro-processor
used therein.
Even though the basic blocks exists as shown in the diagram, there functionality is
interdependent. The entire combination is carefully designed so as to have
minimum effects of Electrical and Electromagnetic noise level on the functionality of
this SPF-25.
The firmware written takes into various error handling eventualities so that the
functioning of this PF relay is error free and highly reliable.

-4-

PF correction technique:
KVAr Inductive

Target
PF.
Cos Φ
= PF

1.5 X kVAr
Of Smallest
Capacitor bank

KW

No change band.
KVAr Capacitive
Capacitor Addition band.
Capacitor Removal band.
SPF-25 for kVAr compensation works with the kW v/s kVAr diagram as shown here
above.
A band is created across the target PF value. (Target PF is set by user). This band
is of +0.75 of the smallest capacitor bank kVAr. Thus, total band width is always 1.5
times the smallest capacitor bank kVAr used. This is a no change band. If the
mains source parameters are within this band, SPF-25 would not change the
capacitors bank status.
If the mains parameters are out of this “No change band”, then SPF-25 calculates
the correct capacitor bank combination to be added / subtracted and within one
correction cycle brings it within the No change band.
The no change band width is selected as mentioned because it has to prevent unnecessary hunting (switching on/off) of the capacitor banks.

-5-

Back Side terminals:

Voltage
Feed-Back

Auxiliary
Supply

Current
Feed-Back
Output commands.

-6-

Capacitor
Current
Feed-Back

Typical Wiring with SPF-25 PF correction system.
L
O
A
D

L
C
R
+

L
C
R
-

L
C
Y
+

L
C
Y
-

L
C
B
+

L
C
B
-

PH 3
PH 2
PH 1
CCR+
CCRCCY+
CCYCCB+
CCB-

S
P
F
2
5

Auxiliary
Supply

L1
L2

Com
C01
C02
|

C06

Mains Connections:
Phase 1 control:
Neutral control:
Commands:
Load Current CT:
Capacitor Current CT:

-7-

Front Facia of SPF-25:
LCD Display

Step status LED indication
Serial Communication Port

Membrane Keypad

Usage of the UP and DN key makes the LCD display to scroll up
and down. This is used for display of various status as well as for
viewing the On line measured electrical values.
These keys are also used for changing values in Parameters
Editing mode and used for status changing of banks in Manual
mode.
Usage of ENT key is for entering the submenu and / or for setting
up some values.
The L and R keys are used in changing the position of the cursor
from Left to Right and vice-versa.

-8-

RS-232 serial communication 9 pin D connector:

5

4

6

3

7

2

8

1

9
RXD

GND

TXD

RS-232 cable connection Details:

PIN
NO

PC side
Connection

CONNECTION

SPF-25

1

NC

2

RXD

TXD

3

TXD

RXD

GND

GND

4
5
6
7
8
9

NC

-9-

Display of Various Parameters / Status:
PAGE: 00

COSΦ= -0.99 A OK

This is default display screen giving
information on PF, mode and
working status.

COSΦ= -0.99 :This part of the display indicates the Power Factor running value. The
sign –ve indicates that PF is Capacitive and no sign (+ve) indicates that PF is Inductive.
The PF indicated is the overall PF of the three phase system.
A or M :
This part either indicates the letter “A” or letter “M”. The letter A means
that SPF-25 is working in Auto mode.
The letter M means that SPF-25 is presently in Manual mode.
The Auto or Manual modes can be selected by pressing ENT key on this page.
(If Password option is enabled, enter the same by using UP/DN/L/R keys and then
Pressing ENT)
Then by UP or DN key you can stroll between the displays:
“1. Edit Mode”, “2. Auto Mode”, “3.Manual Mode”.
The first one “1.Edit Mode” is for parameter changing. The details of parameter changing
are explained in detail in later part of this manual.
The second and third one as display indicates are for selecting Auto or Manual mode
respectively. The ENT key pressed on selecting the mode desired, puts the SPF-25 into
that mode.
Auto Mode: In this mode SPF-25 works in automatic mode. It switches the capacitor
banks automatically depending on the parameter setting of target PF. This mode is the
default mode and is to be used for unmanned operation of the system controlled by
SPF-25.
Manual Mode: This mode is activated for checking/testing the capacitor banks switching.
Its also used for changing the Masking status of the capacitor banks. More on this is
explained later. (On Page 01 explanation)
OK or ** :
The last part of the display that is blinking every 500mS indicates the
working status of SPF-25. “OK” indicates that unit is working fine without any trip
conditions. If there is other indication, the meaning of the same can be as:
OK
:
No Fault
OC
:
Over Capacitor Current
UC
:
Under Capacitor Current
OL
:
Over Load
UL
:
Under Load
OV
:
Over Voltage
UV
:
Under Voltage
OF
:
Over Frequency
UF
:
Under Frequency
OH
:
Over Capacitor Current THD %.
OB
:
Out of Banks
LU
:
Load Unbalance
BF
:
Battery Failure (RTC)
NV
:
NVRAM Checksum Error
VA
:
Voltage Absent
- 10 -

PAGE: 01

PAGE: 01

______

AUTO

______

MAN

This display indicates the Bank status in Auto mode and in Manual mode it helps
to make the specific bank On or Off or declare masked.
: Means Bank is On.
: Means Bank is Off.
: Means Bank is Off and is declared masked (out of action)
: Means Bank does not exist for compensation.
When the Page 01 is in Auto mode, its only for indication of Bank status.
But in Manual mode, the “ENT” key press activates the manual control
mode. The cursor over the bank number starts blinking. The UP and DN
keys can turn On and Off the respective bank.
The DN key pressed puts the respective bank in Masking mode and another
press of DN key brings it out of Masking mode.

Putting the bank masking status permanently:
If a bank is to be permanently put in masked mode or is to be brought out of
permanent masked mode, it can be done by bringing the blinking cursor on
the position of the respective bank by use of L or R key. Then by pressing
DN key, bring the status of the bank to the required level (Masked or
Unmasked). Then press ENT key so that cursor stops blinking. After that by
pressing UP key go to Page 00. Then Press ENT. (If Password option is
enabled, enter the same by using UP/DN/L/R keys and then Press ENT)
“1.EDIT MODE” would be displayed. Press ENT one more time. “1.General
and IO” would be displayed. Press ENT again. “Pwd : Disable” or “Pwd :
Enable” would be displayed. Press UP key. “Exit: No Save” would be
displayed. Press ENT so that cursor will start blinking. Press UP. “Exit: With
Save” would be displayed with cursor blinking. Press ENT. “Saving in
EEPROM” would be displayed for a short time and then Page 00 would be
displayed.
You will observe that the bank status as requirement is changed
permanently to the status desired.

- 11 -

PAGE: 02

1.Overall Values
PRESS
PAGE: 02.1

Avg Vol: 415.7 V
PAGE: 02.2

Avg Cur: 0123.4A
PAGE: 02.3

Tot KW:

0081.2

PAGE: 02.4

TotKVAR: 0024.6
PAGE: 02.5

Tot KVA: 0101.1
PAGE: 02.6

Avg CC:

0031.3A

PAGE: 02.7

CKVAR:

028.35

PAGE: 02.8

LS PF:

0.82

PAGE: 02.9

LS KVAR: 0043.9
PAGE: 02.10

LS KVA:

0125.7

PAGE: 02.11

Freq:

49.9Hz

The Overall values Display menu has submenus as displayed above. As its
self explanatory it means:
Avg Vol: Average voltage of all the three line to line voltage values.
Avg Cur: Average current of all the three phase line current values.
Tot KW: Overall kW of the three phase system measured at source.
TotKVAR: Overall kVAr of the three phase system measured at source.
Tot KVA: Overall kVA of the three phase system measured at source.
Avg CC: Average of three phase current through capacitor panel.
CKVAR: Capacitive kVAr that is compensated by the system.
LS PF: Load side PF. (PF value if not compensated.
LS KVAR: Load side kVAr.
LS KVA: Load side kVA.
Freq: Supply frequency in Hz.
- 12 -

PAGE: 03

2.Per-Phase RMS

PRESS
PAGE: 03.1

R-Y Vol: 415.7 V
PAGE: 03.2

Y-B Vol: 415.7 V
PAGE: 03.3

B-R Vol: 415.7 V
PAGE: 03.4

Rph Cur: 0110.8A
PAGE: 03.5

Yph Cur: 0110.8A
PAGE: 03.6

Bph Cur: 0110.8A
PAGE: 03.7

Neutral: 0010.2A
PAGE: 03.8

Rph Cap: 0022.5A
PAGE: 03.9

Yph Cap: 0022.5A
PAGE: 03.10

Bph Cap: 0022.5A

Per Phase RMS: Submenu:
R-Y Vol: Measured AC Voltage RMS value across R and Y phase.
Y-B Vol: Measured AC Voltage RMS value across Y and B phase.
B-R Vol: Measured AC Voltage RMS value across B and R phase.
Rph Cur: Line current RMS value in R phase. Mains source.
Yph Cur: Line current RMS value in Y phase. Mains source.
Bph Cur: Line current RMS value in B phase. Mains source.
Neutral: Neutral current RMS value.
Rph Cap: Capacitor current RMS value in R phase.
Yph Cap: Capacitor current RMS value in Y phase.
Bph Cap: Capacitor current RMS value in B phase.

- 13 -

PAGE: 04

3.Power
PRESS
PAGE: 04.1

Rph PF:

PAGE: 04.10

1.00

Rph KVA: 0109.7

PAGE: 04.2

Yph PF:

PAGE: 04.11

1.00

Yph KVA: 0109.7

PAGE: 04.3

Bph PF:

PAGE: 04.12

1.00

Bph KVA: 0109.7

PAGE: 04.4

Rph KW:

PAGE: 04.13

0100.2

RphCKVAR: 010.76

PAGE: 04.5

Yph KW:

PAGE: 04.14

0100.2

YphCKVAR: 010.76

PAGE: 04.6

Bph KW:

PAGE: 04.15

0100.2

BphCKVAR: 010.76

PAGE: 04.7

PAGE: 04.16

RphKVAR: 0020.4

Rph mF

PAGE: 04.8

: 165.06

PAGE: 04.17

YphKVAR: 0020.4

Yph mF

PAGE: 04.9

: 165.06

PAGE: 04.18

BphKVAR: 0020.4

Bph mF

: 165.06

Power: Submenu:
Rph PF: Power Factor of R phase on mains source.
Yph PF: Power Factor of Y phase on mains source.
Bph PF: Power Factor of B phase on mains source.
Rph kW: Active Power in kW in R-phase.
Yph kW: Active Power in kW in Y-phase.
Bph kW: Active Power in kW in B-phase.
RphkVAR: Reactive Power in kVAr in R-phase.
YphkVAR: Reactive Power in kVAr in Y-phase.
BphkVAR: Reactive Power in kVAr in B-phase.
Rph KVA: Apparent Power in kVA in R-phase.
Yph KVA: Apparent Power in kVA in Y-phase.
Bph KVA: Apparent Power in kVA in B-phase.
RphCKVAR: Capacitor injected reactive power in R-phase.
YphCKVAR: Capacitor injected reactive power in Y-phase.
BphCKVAR: Capacitor injected reactive power in B-phase.
Rph mF: Capacitor value in micro-farad in R-phase.
Yph mF: Capacitor value in micro-farad in Y-phase.
Bph mF: Capacitor value in micro-farad in B-phase.
- 14 -

PAGE: 05

4.Energy
PRESS
PAGE: 05.1

KWH:

1234567.8

PAGE: 05.2

IndKVARH:12345.6
PAGE: 05.3

CapKVARH:12345.6
PAGE: 05.4

KVAH:

1234567.8

PAGE: 05.5

CKVARH:1234567.8

Energy: Submenu:
KWH: Overall cumulative active energy in kWh on Mains supply.
IndKVARH: Inductive reactive energy in kVArh on Mains supply.
CapKVARH: Capacitive reactive energy in kVArh on Mains supply.
KVAH: Overall cumulative apparent energy in kVA on Mains supply.
CKVARH: Capacitor compensated reactive energy in kVArh.

- 15 -

PAGE: 06

5.Harmonics
PRESS
PAGE: 06.1

Vr-THD-F: 002.4%
PAGE: 06.2

Vy-THD-F: 002.4%
PAGE: 06.3

Vb-THD-F: 002.4%
PAGE: 06.4

Ir-THD-F: 012.5%
PAGE: 06.5

Iy-THD-F: 012.5%
PAGE: 06.6

Ib-THD-F: 012.5%
PAGE: 06.7

In-THD-F: 005.0%
PAGE: 06.8

CCr-THD-F:028.2%
PAGE: 06.9

CCy-THD-F:028.2%
PAGE: 06.10

CCb-THD-F:028.2%

Harmonics: Submenu:
Vr-THD-F/R: R-Y line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Vy-THD-F/R: Y-B line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Vb-THD-F/R: B-R line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Ir-THD-F/R: R phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Iy-THD-F/R: Y phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Ib-THD-F/R: B phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
In-THD-F/R: Neutral current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
CCr-THD-F/R: R phase Capacitor current % Total Harmonic Distortion.
CCy-THD-F/R: Y phase Capacitor current % Total Harmonic Distortion.
CCb-THD-F/R: B phase Capacitor current % Total Harmonic Distortion.

- 16 -

PAGE: 07

6.Step KVAR
PRESS
PAGE: 07.1

Stp1 KVAR:0009.0
PAGE: 07.2

Stp2 KVAR:0009.0
PAGE: 07.3

Stp3 KVAR:0009.0
PAGE: 07.4

Stp4 KVAR:0009.0
PAGE: 07.5

Stp5 KVAR:0009.0
PAGE: 07.6

Stp6 KVAR:0009.0

Step KVAR: Submenu:
Stp1 KVAR: Step 1 kVAr value normalized at Capacitor rated voltage.
Stp2 KVAR: Step 2 kVAr value normalized at Capacitor rated voltage.
Stp3 KVAR: Step 3 kVAr value normalized at Capacitor rated voltage.
Stp4 KVAR: Step 4 kVAr value normalized at Capacitor rated voltage.
Stp5 KVAR: Step 5 kVAr value normalized at Capacitor rated voltage.
Stp6 KVAR: Step 6 kVAr value normalized at Capacitor rated voltage.

- 17 -

PAGE: 08

Time: 10:10:00
Real Time Clock: RTC time set in the SPF-25 is displayed here. Its in
HH:MM:SS format.

PAGE: 09

Date: 07:11:06
Real Time Clock: RTC date set in the SPF-25 is displayed here. Its in
dd:mm:yy format.

PAGE: 10

SPF-25 1.0.6

SPF-25 internal firmware version number is displayed here. (Just for user
information)

Total number of Main display pages are 11nos ranging from “00” to
“10”.

- 18 -

Method for Keyboard/Display usage.

Flow chart for entering into different modes:

PRESS
Enable

Default
Display
mode

If Password
Option is
Enable/Disable.

Disable

Enter Pwd: ****
PRESS
Enter the 4
Digit password
By use of
L, R, UP & DN
Keys.

PRESS

NO

IF
PASSWORD
Correct?

*

YES
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

1.Edit Mode

2.Auto Mode

3.Manual Mode

- 19 -

Parameter Editing Submenu Level 1:

*
1.General
2.System
3.Fault
4.Step
5.Communication

Sub-menu
Level 1
for
Parameter
Editing.

Parameter Editing
Sub-Menu
LEVEL 2

1.General and IO: Parameters related with general function and Input/Output
2. System: Electrical system (Mains supply) related parameters.

3. Fault: Setting Faults and fault levels.
4. Step: Capacitor Steps related parameters.
5. Communication: Parameters related with communication and data logging.

- 20 -

Parameter Editing Method:
(For Submenu Level 2 : L2)

Sub-Menu Level 1.
Cursor Blinking
at Parameter Values.

1.Submenu L2: ****

1.Submenu L2: ****
PRESS

key to increment value.

PRESS

Key to decrement value.

PRESS

Key to shift cursor Left.

PRESS

Key to shift cursor Right.
2.Submenu L2: ****

2.Submenu L2: ****
PRESS

key to increment value.

PRESS

Key to decrement value.

PRESS

Key to shift cursor Left.

PRESS

Key to shift cursor Right.

3.Submenu L2: ****

Exit: No Save

Exit: No Save

Without saving

Default
Display.

With saving

Screen for 1second

Saving In EEProm

Exit: With Save

- 21 -

Parameter Editing Submenu Level 2:
Menu
General

Parameter
Pwd
Ch-Pwd
Ld Def
THD
Rst. Energy

Meaning of Parameter
Password Control
Password value
Load all factory default parameters.
Type of THD factor to be displayed
Energy Counters reset to zero option

Default
Enable
1111
No
F-THD
No

Menu
System

Parameter
Meas. Vol.
Ld. Cur. Pr.
Cap. Cur. Pr.
PF Target
PF Target
Auto Sync
Async Tol.
Reset Async

Meaning of Parameter
Default
SPF-25 rated measurement voltage
440
Primary current value of mains CT
0180
0075
Primary current value of capacitor CT
Target PF for deciding Lag or Lead
Lag
1.00
Target PF exact value
Automatic synchronisation requirement Yes
% load variation tolerence for Auto-sync. 30
No
Reset Auto-sync to default value.

Menu
Fault

Parameter
Over Vol.
Over Vol. Lim
Over Vol. Clr
Under Vol.
Under Vol. Lim
Under Vol. Clr
Over Load
Over Ld. Lim
Over Ld. Clr
Under Ld.
Under Ld. Lim
Under Ld. Clr
Ld. Unbalance
Ld. Unb. Lim
Over CC
Over CC. Lim
Over CC. Clr
Over CC. Rst.
Over CC. Rst.
Under CC.
Under CC. Lim
Under CC. CLr
CC THD
CC THD Lim
CC THD Clr
Step Check
Cap. Cur Tol
Under Comp.
RTC Bat

Meaning of Parameter
Default
Over Voltage Fault: action by PDE-30 Off Step
Over Voltage activation limit value
1.10
Over Voltage resumption limit value 1.05
Under Voltage Fault: Action?
Off Step
Under Voltage activation limit value 0.70
Under Voltage resumption limit value 0.75
Over Load Fault: Action?
Indicate
Mains current over load limit value
1.30
Mains cur. over load resume value
1.25
Under Load on Mains: Action?
Indicate
Under load Activation limit value
0.03
Under load Resumption limit value
0.05
Load Un-balance Fault: Action?
Off Step
Load Un-balance limit
025%
Capacitor Over Current Fault: Action? Disable
Cap. Over Current Limit value.
1.30
Cap. Over Current Resume value.
1.25
Auto reset feature on Cap. Over Cur. No
If Over CC. Rst.=Yes. Time for reset. 120 sec
Under Capacitor current fault: Action? Disable
Under Cap. Cur. Limit value.
0.95
Under Cap. Cur. Resume value.
0.97
Capacitor current Over THD: Action? Disable
Cap.Cur. Over THD limit value.
0.10
Cap.Cur. Over THD resume value.
0.08
Every step kVAr healthiness monitor. Disable
Step kVAr healthiness: tolerence.
0.10
Out of Banks Indication.
Disable
RTC Battery fault monitoring.
Enable

- 22 -

Min
Disable
0000
No
R-THD
No
Min
Non
0001
0001
Lead
0.70Lag
No
01
No

Min

Max
Enable
9999
Yes
F-THD
Yes
Max
Edible
9999
9999
Lag
0.85Lead
Yes
50
Yes

Max

Disable, Indicative, Off Step

0.90
0.85

1.20
1.15

Disable, Indicative, Off Step

0.70
0.75

0.95
1.00

Disable, Indicative, Off Step

1.10
1.05

1.30
1.25

Disable, Indicative, Off Step

0.01
0.02

0.20
0.25

Disable, Indicative, Off Step

005%

100%

Disable, Indicative, Off Step

1.05
1.00
No
15

1.50
1.45
Yes
900

Disable, Indicative, Off Step

0.75
0.80

0.98
1.00

Disable, Indicative, Off Step

0.02
0.01
Disable
0.03
Disable
Disable

0.99
0.90
Enable
0.50
Enable
Enable

Menu
Step

Parameter
No. of Steps
Step Vol
Corr. Time
Discharge Time
Step 1 KVAR
Step 2 KVAR
Step 3 KVAR
Step 4 KVAR
Step 5 KVAR
Step 6 KVAR

Meaning of Parameter
Number of Capacitor steps utilised
Voltage at which kVAr is defined
Correction cycle time.
Capacitor discharge time.
Step 1 kVAr value.
Step 2 kVAr value.
Step 3 kVAr value.
Step 4 kVAr value.
Step 5 kVAr value.
Step 6 kVAr value.

Menu
Parameter
Meaning of Parameter
Communication Unit ID
Communication ID of the unit
Baud Rate
Serial communication baud rate.
Time
RTC time to be set
Date
RTC date to be set
Init RTC
Initialise RTC?
Clear NVRAM Clear all contents on NV RAM?

Default
3
440
120 secs
120 secs
006
009
018
018
018
018

Min
1
380
010
010
001
001
001
001
001
001

Default
3001
09600
--No
No

Min
0000
04800
--No
No

Max
6
660
240
240
250
250
250
250
250
250

Max
9999
38400
--Yes
Yes

Note that all the parameters in the Sub-Menu Level 2 should be carefully filled in the
SPF-25. Failing to put the correct parameters can make SPF-25 to malfunction.
Its therefore advised that a trained person should only be allowed to change these
values.

- 23 -

Commissioning Instructions :
before panel is powered up for the first time.
1. Panel Wiring Check
Ensure that all connections in the panel is tightened properly and there are no
loose connections. Also ensure that the wiring is done as per the wiring
diagram.
2. Power Wiring Check
Ensure that the power cables are connected properly from the Panel I/C to the
feeder I/C or the transformer bushings. The connection has to be after the
Load Feed back CT looking from the Transformer side.
Ensure that the Bus Bars and/or Lugs are clean and free of Dust, Corrosion or
Oxidation on the contact sides so that good electrical connection is maintained.
The surface area should be flat so as to get maximum contact area.
If required Clean the Bus Bars and/ or Lugs by rubbing it with Polish Paper to
remove the oxidation layer. Provide contact paste in between the contacts
surfaces.
Not performing this, can result in to a weaker source point for Capacitor
charging during Step on and this can generate undesirable Noise which can
hamper the performance of equipments installed in the capacitor panel.
3. Load Feed Back CT connection.
Ensure that the load feed back CT connections are done properly. Confirm that
correct phase CT is connected with the correct phase input terminals. (Even
though auto sync is capable of taking care of wrong CT polarities or CT
position interchanging, but then on display, the Phase readings may be seen to
be interchanged. (May be R-phase reading would be seen in B-phase and
vice-versa.
CT connections to be done carefully so as to ensure that the wire does not get
open and there is no loose connection.

Loose connection’s or open CT secondary can result in to very high voltages
getting developed in the circuit which can damage the CT and also produce
high levels of noise in the system.

- 24 -

Fault Finding Guidelines :

Fault Type

Probable Reason

Action to Take

Unit Does not
turn ON. No
display on LCD.

•Input auxiliary supply
not coming.
•Input side fuses
blown

•Check the input
supply to restore
•Check fuses in the
unit for OK.

Unit does not
turn On any
capacitors even
if PF is below
Lower PF limit.

•If auto-sync failure
message is there at
Power On.

• Load may be highly
fluctuating so need of
manual
synchronisation only.
• This is OK
condition.

• The load KW is too
low with Under load
fault enable condition.
•Control connections
from SPF-25 to
contactor coils are not
proper

•Check control supply
and connections from
SPF-25 to contactors.

BF indication on
Default display.

• Internal Ni-Cd
3.2Vdc battery used
for RTC and NV RAM
must be drained down.

• Replace this battery
in consultancy with
TAS trained
personnel.

Some Capacitor
banks are
declared as
faulty even if
they are
checked to be
OK.

•Individual step health
monitoring is enabled
and tolerance limits
set are too stringent.
• Capacitor current
THD factor is
continuously
fluctuating.

•Set the tolerance
limits for individual
steps monitoring as
relaxed.
• With continuously
fluctuating THD of
Capacitor current and
higher level of THD
can cause some
errors in individual
step KVAR
measurement. Under
this condition, best is
to keep this feature
disabled.

- 25 -

Fault Finding Guidelines (continued):

Fault Type

Probable Reason

Action to Take

Serial
Communication
is not working.

• Baud rate selection
is not proper.
• Unit ID is not set
properly.
• Serial
communication cable
connections are not
proper.

• Select proper baud
rate.
• Set the unit ID
correctly.
• Check the serial
cable continuity as
per the connections
given earlier in this
manual.

Data logging is
not taking place.

• Possible that RTC
date is not set
properly.

• Change the battery
by help of TAS’s
authorised person.

SPF-25 resets
occasionally on
turning OFF of
any contactor.

• The contactor supply
phase may be the
same as used for SPF25 auxiliary supply.
• RC snubbers/ free
wheeling diodes are
not put with contactor
coils.

• Use the different
phase for control
supply of contactors
and for SPF-25 supply
• Usage of RC
snubbers / free
wheeling diodes is
mandatory.

- 26 -

Corporate Office/Works/Design Centre:
W-61, MIDC, Ambad, Nasik - 422010, Maharashtra (India)
Tel: +91-(253)-2384038 / 2381090
Email: [email protected]
Marketing and After-Sales Service:
A/58, Kamal Pushpa, K.C. Road, Bandra, Mumbai-400050.
Tel: +91-9930513923
Email: [email protected]
Regional Office: Delhi
191-B, Ground Floor, Padam Nagar (Filter Market),
New Delhi - 110007 (India).
Tel: +91-9911615701
Email: [email protected]


Slide 6

Operations Manual
SPF-25/6
AUTOMATIC POWER FACTOR
CONTROLLER

TAS Powertek Pvt. Ltd.
Corporate Office:
W-61, MIDC, Ambad, Nasik - 422010, Maharashtra (India)
Tel: +91-(253)-2384038 / 2381090
Email: [email protected]

NOTE
These instructions do not purport to cover all details or
variations in equipment, nor to provide for every possible
contingency to be met in connection with installation,
operation or maintenance.

Should further information be desired or should particular
problems arise which are not covered sufficiently for the
purchasers purposes, the matter should be referred to our
TAS Powertek Pvt. Ltd., office.
The contents of this instruction Manual shall not become
part of or modify any prior or existing agreement or
relationship. The sales contract contains the entire
obligations of TAS Powertek Pvt. Ltd. The warranty
contained in the contract between the parties is the sole
warranty of TAS Powertek Pvt. Ltd. Any statements
contained herein do not create new warranties or modify the
existing warranty.

The reproduction, transmission or use of this
document or its contents is not permitted
without express written authority. Offenders
will be liable for damages. All rights are
reserved.

Index
Index Page
-----------------Features & Specifications
----------Mechanical Dimensions/ mounting --------Functional Block diagram
-----------------PF correction technique
-----------------Back Side terminals
-----------------------Typical wiring scheme ---------------------Front Facia
---------------------------------Communication connector connections ----Display of various parameters / Status ---Method of Keyboard/Display usage -------Parameter Submenu -----------------------Commissioning Instruction (before Powerup)
Fault finding Guidelines ---------------------

-1-

1
2
3
4
5
6
7
8
9
10
19
22
24
25

Features:
• Totally Micro-processor controlled Digital Signal processing
logic for measurements.
• All measurements with 1.0 class accuracy.
• Automatic Synchronisation capable of giving the correct
results for wrong connections at CT terminals (even wrong
polarity of CTs).
• Measurement and kVAr compensation are frequency / THD
compensated.
• Load V,Iph, In and Cap. current THD measurement.
• Up-to 6 output banks control.
• Capable of doing the kVAr measurements on basis of mean
of the correction cycle time and provide kVAr compensation.
• Standard 144 X 144 cabinet for panel door flush mounting.
• Serial communication through standard TAS protocols.
• Manual testing mode for user checking of the Capacitor steps
switching.
• Protections provided (user settable):
Over/under Voltage
Cap. Over/under current / THD.
Over/Under frequency (internally set limits)
Over / Under load.
Load unbalance.
Capacitor individual step kVAr monitoring.
Out of steps: Under-compensation (only for indication)
NV-RAM battery down.
• Data logging for various parameters for 2months period at an
interval of 1hr.
• Unit comes along with PC (Windows compatible) software
for downloading and viewing the logged data.

Specifications:
•
•
•
•
•
•
•
•
•
•
•
•

Feed-back Voltage:440Volt (+10%/-30%)
Current input : 1Amp for load and capacitor feed-back.
Measurement Accuracy: Class 1.0
Auxiliary Supply: 525Vac to 300Vac.
Correction / Discharge time:
Selectable in seconds from 10sec. to 240sec.
Output commands:
NO contacts each with current rating of 0.5Amp AC. at
240Vac.
RS-232 baud rate selectable from 4.8kBPS to 38.4kBPS.
Operating temperature: 0 to 55oC.
1.0class measurement Operating temperature: 0 to 50oC.
Storage temperature: -10 to +75oC.
Humidity: 0 to 98%.
Supply frequency: 45Hz to 55Hz.

-2-

Mechanical Dimensions:
135

144

135

120
144

6

Recommended size for cutout on panel door is 138 X 138.
All Dimensions given are in mm.

Maximum weight: (with clamps and terminals) = 2.5kg.

-3-

Functional Block Diagram:
3 channel
Current f.b.

3
Channel
Cap.
Current
f.b.

3 channel
Voltage f.b.

SPF-25

V, I, PF and Power
Measurement
Block
For every AC mains
Cycle.

Calculation
Block for
• Energy Parameters
• Harmonic analysis

EEPROM
For Data
Logging

Keyboard,
Display and
Other support
Functions
Block.

RS-232 Serial
Communication.
TAS-01
Protocol stack.

Power Factor
Correction Block
+ event monitoring.

Outputs Commands
For Capacitor
Switching.

Power Supply
Block.

Above block diagram gives the functional blocks that are built into SPF-25 PF
correction relay.
These blocks are made up with the combination of functions from hardware and
corresponding firmware that resides in the Program memory of the micro-processor
used therein.
Even though the basic blocks exists as shown in the diagram, there functionality is
interdependent. The entire combination is carefully designed so as to have
minimum effects of Electrical and Electromagnetic noise level on the functionality of
this SPF-25.
The firmware written takes into various error handling eventualities so that the
functioning of this PF relay is error free and highly reliable.

-4-

PF correction technique:
KVAr Inductive

Target
PF.
Cos Φ
= PF

1.5 X kVAr
Of Smallest
Capacitor bank

KW

No change band.
KVAr Capacitive
Capacitor Addition band.
Capacitor Removal band.
SPF-25 for kVAr compensation works with the kW v/s kVAr diagram as shown here
above.
A band is created across the target PF value. (Target PF is set by user). This band
is of +0.75 of the smallest capacitor bank kVAr. Thus, total band width is always 1.5
times the smallest capacitor bank kVAr used. This is a no change band. If the
mains source parameters are within this band, SPF-25 would not change the
capacitors bank status.
If the mains parameters are out of this “No change band”, then SPF-25 calculates
the correct capacitor bank combination to be added / subtracted and within one
correction cycle brings it within the No change band.
The no change band width is selected as mentioned because it has to prevent unnecessary hunting (switching on/off) of the capacitor banks.

-5-

Back Side terminals:

Voltage
Feed-Back

Auxiliary
Supply

Current
Feed-Back
Output commands.

-6-

Capacitor
Current
Feed-Back

Typical Wiring with SPF-25 PF correction system.
L
O
A
D

L
C
R
+

L
C
R
-

L
C
Y
+

L
C
Y
-

L
C
B
+

L
C
B
-

PH 3
PH 2
PH 1
CCR+
CCRCCY+
CCYCCB+
CCB-

S
P
F
2
5

Auxiliary
Supply

L1
L2

Com
C01
C02
|

C06

Mains Connections:
Phase 1 control:
Neutral control:
Commands:
Load Current CT:
Capacitor Current CT:

-7-

Front Facia of SPF-25:
LCD Display

Step status LED indication
Serial Communication Port

Membrane Keypad

Usage of the UP and DN key makes the LCD display to scroll up
and down. This is used for display of various status as well as for
viewing the On line measured electrical values.
These keys are also used for changing values in Parameters
Editing mode and used for status changing of banks in Manual
mode.
Usage of ENT key is for entering the submenu and / or for setting
up some values.
The L and R keys are used in changing the position of the cursor
from Left to Right and vice-versa.

-8-

RS-232 serial communication 9 pin D connector:

5

4

6

3

7

2

8

1

9
RXD

GND

TXD

RS-232 cable connection Details:

PIN
NO

PC side
Connection

CONNECTION

SPF-25

1

NC

2

RXD

TXD

3

TXD

RXD

GND

GND

4
5
6
7
8
9

NC

-9-

Display of Various Parameters / Status:
PAGE: 00

COSΦ= -0.99 A OK

This is default display screen giving
information on PF, mode and
working status.

COSΦ= -0.99 :This part of the display indicates the Power Factor running value. The
sign –ve indicates that PF is Capacitive and no sign (+ve) indicates that PF is Inductive.
The PF indicated is the overall PF of the three phase system.
A or M :
This part either indicates the letter “A” or letter “M”. The letter A means
that SPF-25 is working in Auto mode.
The letter M means that SPF-25 is presently in Manual mode.
The Auto or Manual modes can be selected by pressing ENT key on this page.
(If Password option is enabled, enter the same by using UP/DN/L/R keys and then
Pressing ENT)
Then by UP or DN key you can stroll between the displays:
“1. Edit Mode”, “2. Auto Mode”, “3.Manual Mode”.
The first one “1.Edit Mode” is for parameter changing. The details of parameter changing
are explained in detail in later part of this manual.
The second and third one as display indicates are for selecting Auto or Manual mode
respectively. The ENT key pressed on selecting the mode desired, puts the SPF-25 into
that mode.
Auto Mode: In this mode SPF-25 works in automatic mode. It switches the capacitor
banks automatically depending on the parameter setting of target PF. This mode is the
default mode and is to be used for unmanned operation of the system controlled by
SPF-25.
Manual Mode: This mode is activated for checking/testing the capacitor banks switching.
Its also used for changing the Masking status of the capacitor banks. More on this is
explained later. (On Page 01 explanation)
OK or ** :
The last part of the display that is blinking every 500mS indicates the
working status of SPF-25. “OK” indicates that unit is working fine without any trip
conditions. If there is other indication, the meaning of the same can be as:
OK
:
No Fault
OC
:
Over Capacitor Current
UC
:
Under Capacitor Current
OL
:
Over Load
UL
:
Under Load
OV
:
Over Voltage
UV
:
Under Voltage
OF
:
Over Frequency
UF
:
Under Frequency
OH
:
Over Capacitor Current THD %.
OB
:
Out of Banks
LU
:
Load Unbalance
BF
:
Battery Failure (RTC)
NV
:
NVRAM Checksum Error
VA
:
Voltage Absent
- 10 -

PAGE: 01

PAGE: 01

______

AUTO

______

MAN

This display indicates the Bank status in Auto mode and in Manual mode it helps
to make the specific bank On or Off or declare masked.
: Means Bank is On.
: Means Bank is Off.
: Means Bank is Off and is declared masked (out of action)
: Means Bank does not exist for compensation.
When the Page 01 is in Auto mode, its only for indication of Bank status.
But in Manual mode, the “ENT” key press activates the manual control
mode. The cursor over the bank number starts blinking. The UP and DN
keys can turn On and Off the respective bank.
The DN key pressed puts the respective bank in Masking mode and another
press of DN key brings it out of Masking mode.

Putting the bank masking status permanently:
If a bank is to be permanently put in masked mode or is to be brought out of
permanent masked mode, it can be done by bringing the blinking cursor on
the position of the respective bank by use of L or R key. Then by pressing
DN key, bring the status of the bank to the required level (Masked or
Unmasked). Then press ENT key so that cursor stops blinking. After that by
pressing UP key go to Page 00. Then Press ENT. (If Password option is
enabled, enter the same by using UP/DN/L/R keys and then Press ENT)
“1.EDIT MODE” would be displayed. Press ENT one more time. “1.General
and IO” would be displayed. Press ENT again. “Pwd : Disable” or “Pwd :
Enable” would be displayed. Press UP key. “Exit: No Save” would be
displayed. Press ENT so that cursor will start blinking. Press UP. “Exit: With
Save” would be displayed with cursor blinking. Press ENT. “Saving in
EEPROM” would be displayed for a short time and then Page 00 would be
displayed.
You will observe that the bank status as requirement is changed
permanently to the status desired.

- 11 -

PAGE: 02

1.Overall Values
PRESS
PAGE: 02.1

Avg Vol: 415.7 V
PAGE: 02.2

Avg Cur: 0123.4A
PAGE: 02.3

Tot KW:

0081.2

PAGE: 02.4

TotKVAR: 0024.6
PAGE: 02.5

Tot KVA: 0101.1
PAGE: 02.6

Avg CC:

0031.3A

PAGE: 02.7

CKVAR:

028.35

PAGE: 02.8

LS PF:

0.82

PAGE: 02.9

LS KVAR: 0043.9
PAGE: 02.10

LS KVA:

0125.7

PAGE: 02.11

Freq:

49.9Hz

The Overall values Display menu has submenus as displayed above. As its
self explanatory it means:
Avg Vol: Average voltage of all the three line to line voltage values.
Avg Cur: Average current of all the three phase line current values.
Tot KW: Overall kW of the three phase system measured at source.
TotKVAR: Overall kVAr of the three phase system measured at source.
Tot KVA: Overall kVA of the three phase system measured at source.
Avg CC: Average of three phase current through capacitor panel.
CKVAR: Capacitive kVAr that is compensated by the system.
LS PF: Load side PF. (PF value if not compensated.
LS KVAR: Load side kVAr.
LS KVA: Load side kVA.
Freq: Supply frequency in Hz.
- 12 -

PAGE: 03

2.Per-Phase RMS

PRESS
PAGE: 03.1

R-Y Vol: 415.7 V
PAGE: 03.2

Y-B Vol: 415.7 V
PAGE: 03.3

B-R Vol: 415.7 V
PAGE: 03.4

Rph Cur: 0110.8A
PAGE: 03.5

Yph Cur: 0110.8A
PAGE: 03.6

Bph Cur: 0110.8A
PAGE: 03.7

Neutral: 0010.2A
PAGE: 03.8

Rph Cap: 0022.5A
PAGE: 03.9

Yph Cap: 0022.5A
PAGE: 03.10

Bph Cap: 0022.5A

Per Phase RMS: Submenu:
R-Y Vol: Measured AC Voltage RMS value across R and Y phase.
Y-B Vol: Measured AC Voltage RMS value across Y and B phase.
B-R Vol: Measured AC Voltage RMS value across B and R phase.
Rph Cur: Line current RMS value in R phase. Mains source.
Yph Cur: Line current RMS value in Y phase. Mains source.
Bph Cur: Line current RMS value in B phase. Mains source.
Neutral: Neutral current RMS value.
Rph Cap: Capacitor current RMS value in R phase.
Yph Cap: Capacitor current RMS value in Y phase.
Bph Cap: Capacitor current RMS value in B phase.

- 13 -

PAGE: 04

3.Power
PRESS
PAGE: 04.1

Rph PF:

PAGE: 04.10

1.00

Rph KVA: 0109.7

PAGE: 04.2

Yph PF:

PAGE: 04.11

1.00

Yph KVA: 0109.7

PAGE: 04.3

Bph PF:

PAGE: 04.12

1.00

Bph KVA: 0109.7

PAGE: 04.4

Rph KW:

PAGE: 04.13

0100.2

RphCKVAR: 010.76

PAGE: 04.5

Yph KW:

PAGE: 04.14

0100.2

YphCKVAR: 010.76

PAGE: 04.6

Bph KW:

PAGE: 04.15

0100.2

BphCKVAR: 010.76

PAGE: 04.7

PAGE: 04.16

RphKVAR: 0020.4

Rph mF

PAGE: 04.8

: 165.06

PAGE: 04.17

YphKVAR: 0020.4

Yph mF

PAGE: 04.9

: 165.06

PAGE: 04.18

BphKVAR: 0020.4

Bph mF

: 165.06

Power: Submenu:
Rph PF: Power Factor of R phase on mains source.
Yph PF: Power Factor of Y phase on mains source.
Bph PF: Power Factor of B phase on mains source.
Rph kW: Active Power in kW in R-phase.
Yph kW: Active Power in kW in Y-phase.
Bph kW: Active Power in kW in B-phase.
RphkVAR: Reactive Power in kVAr in R-phase.
YphkVAR: Reactive Power in kVAr in Y-phase.
BphkVAR: Reactive Power in kVAr in B-phase.
Rph KVA: Apparent Power in kVA in R-phase.
Yph KVA: Apparent Power in kVA in Y-phase.
Bph KVA: Apparent Power in kVA in B-phase.
RphCKVAR: Capacitor injected reactive power in R-phase.
YphCKVAR: Capacitor injected reactive power in Y-phase.
BphCKVAR: Capacitor injected reactive power in B-phase.
Rph mF: Capacitor value in micro-farad in R-phase.
Yph mF: Capacitor value in micro-farad in Y-phase.
Bph mF: Capacitor value in micro-farad in B-phase.
- 14 -

PAGE: 05

4.Energy
PRESS
PAGE: 05.1

KWH:

1234567.8

PAGE: 05.2

IndKVARH:12345.6
PAGE: 05.3

CapKVARH:12345.6
PAGE: 05.4

KVAH:

1234567.8

PAGE: 05.5

CKVARH:1234567.8

Energy: Submenu:
KWH: Overall cumulative active energy in kWh on Mains supply.
IndKVARH: Inductive reactive energy in kVArh on Mains supply.
CapKVARH: Capacitive reactive energy in kVArh on Mains supply.
KVAH: Overall cumulative apparent energy in kVA on Mains supply.
CKVARH: Capacitor compensated reactive energy in kVArh.

- 15 -

PAGE: 06

5.Harmonics
PRESS
PAGE: 06.1

Vr-THD-F: 002.4%
PAGE: 06.2

Vy-THD-F: 002.4%
PAGE: 06.3

Vb-THD-F: 002.4%
PAGE: 06.4

Ir-THD-F: 012.5%
PAGE: 06.5

Iy-THD-F: 012.5%
PAGE: 06.6

Ib-THD-F: 012.5%
PAGE: 06.7

In-THD-F: 005.0%
PAGE: 06.8

CCr-THD-F:028.2%
PAGE: 06.9

CCy-THD-F:028.2%
PAGE: 06.10

CCb-THD-F:028.2%

Harmonics: Submenu:
Vr-THD-F/R: R-Y line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Vy-THD-F/R: Y-B line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Vb-THD-F/R: B-R line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Ir-THD-F/R: R phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Iy-THD-F/R: Y phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Ib-THD-F/R: B phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
In-THD-F/R: Neutral current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
CCr-THD-F/R: R phase Capacitor current % Total Harmonic Distortion.
CCy-THD-F/R: Y phase Capacitor current % Total Harmonic Distortion.
CCb-THD-F/R: B phase Capacitor current % Total Harmonic Distortion.

- 16 -

PAGE: 07

6.Step KVAR
PRESS
PAGE: 07.1

Stp1 KVAR:0009.0
PAGE: 07.2

Stp2 KVAR:0009.0
PAGE: 07.3

Stp3 KVAR:0009.0
PAGE: 07.4

Stp4 KVAR:0009.0
PAGE: 07.5

Stp5 KVAR:0009.0
PAGE: 07.6

Stp6 KVAR:0009.0

Step KVAR: Submenu:
Stp1 KVAR: Step 1 kVAr value normalized at Capacitor rated voltage.
Stp2 KVAR: Step 2 kVAr value normalized at Capacitor rated voltage.
Stp3 KVAR: Step 3 kVAr value normalized at Capacitor rated voltage.
Stp4 KVAR: Step 4 kVAr value normalized at Capacitor rated voltage.
Stp5 KVAR: Step 5 kVAr value normalized at Capacitor rated voltage.
Stp6 KVAR: Step 6 kVAr value normalized at Capacitor rated voltage.

- 17 -

PAGE: 08

Time: 10:10:00
Real Time Clock: RTC time set in the SPF-25 is displayed here. Its in
HH:MM:SS format.

PAGE: 09

Date: 07:11:06
Real Time Clock: RTC date set in the SPF-25 is displayed here. Its in
dd:mm:yy format.

PAGE: 10

SPF-25 1.0.6

SPF-25 internal firmware version number is displayed here. (Just for user
information)

Total number of Main display pages are 11nos ranging from “00” to
“10”.

- 18 -

Method for Keyboard/Display usage.

Flow chart for entering into different modes:

PRESS
Enable

Default
Display
mode

If Password
Option is
Enable/Disable.

Disable

Enter Pwd: ****
PRESS
Enter the 4
Digit password
By use of
L, R, UP & DN
Keys.

PRESS

NO

IF
PASSWORD
Correct?

*

YES
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

1.Edit Mode

2.Auto Mode

3.Manual Mode

- 19 -

Parameter Editing Submenu Level 1:

*
1.General
2.System
3.Fault
4.Step
5.Communication

Sub-menu
Level 1
for
Parameter
Editing.

Parameter Editing
Sub-Menu
LEVEL 2

1.General and IO: Parameters related with general function and Input/Output
2. System: Electrical system (Mains supply) related parameters.

3. Fault: Setting Faults and fault levels.
4. Step: Capacitor Steps related parameters.
5. Communication: Parameters related with communication and data logging.

- 20 -

Parameter Editing Method:
(For Submenu Level 2 : L2)

Sub-Menu Level 1.
Cursor Blinking
at Parameter Values.

1.Submenu L2: ****

1.Submenu L2: ****
PRESS

key to increment value.

PRESS

Key to decrement value.

PRESS

Key to shift cursor Left.

PRESS

Key to shift cursor Right.
2.Submenu L2: ****

2.Submenu L2: ****
PRESS

key to increment value.

PRESS

Key to decrement value.

PRESS

Key to shift cursor Left.

PRESS

Key to shift cursor Right.

3.Submenu L2: ****

Exit: No Save

Exit: No Save

Without saving

Default
Display.

With saving

Screen for 1second

Saving In EEProm

Exit: With Save

- 21 -

Parameter Editing Submenu Level 2:
Menu
General

Parameter
Pwd
Ch-Pwd
Ld Def
THD
Rst. Energy

Meaning of Parameter
Password Control
Password value
Load all factory default parameters.
Type of THD factor to be displayed
Energy Counters reset to zero option

Default
Enable
1111
No
F-THD
No

Menu
System

Parameter
Meas. Vol.
Ld. Cur. Pr.
Cap. Cur. Pr.
PF Target
PF Target
Auto Sync
Async Tol.
Reset Async

Meaning of Parameter
Default
SPF-25 rated measurement voltage
440
Primary current value of mains CT
0180
0075
Primary current value of capacitor CT
Target PF for deciding Lag or Lead
Lag
1.00
Target PF exact value
Automatic synchronisation requirement Yes
% load variation tolerence for Auto-sync. 30
No
Reset Auto-sync to default value.

Menu
Fault

Parameter
Over Vol.
Over Vol. Lim
Over Vol. Clr
Under Vol.
Under Vol. Lim
Under Vol. Clr
Over Load
Over Ld. Lim
Over Ld. Clr
Under Ld.
Under Ld. Lim
Under Ld. Clr
Ld. Unbalance
Ld. Unb. Lim
Over CC
Over CC. Lim
Over CC. Clr
Over CC. Rst.
Over CC. Rst.
Under CC.
Under CC. Lim
Under CC. CLr
CC THD
CC THD Lim
CC THD Clr
Step Check
Cap. Cur Tol
Under Comp.
RTC Bat

Meaning of Parameter
Default
Over Voltage Fault: action by PDE-30 Off Step
Over Voltage activation limit value
1.10
Over Voltage resumption limit value 1.05
Under Voltage Fault: Action?
Off Step
Under Voltage activation limit value 0.70
Under Voltage resumption limit value 0.75
Over Load Fault: Action?
Indicate
Mains current over load limit value
1.30
Mains cur. over load resume value
1.25
Under Load on Mains: Action?
Indicate
Under load Activation limit value
0.03
Under load Resumption limit value
0.05
Load Un-balance Fault: Action?
Off Step
Load Un-balance limit
025%
Capacitor Over Current Fault: Action? Disable
Cap. Over Current Limit value.
1.30
Cap. Over Current Resume value.
1.25
Auto reset feature on Cap. Over Cur. No
If Over CC. Rst.=Yes. Time for reset. 120 sec
Under Capacitor current fault: Action? Disable
Under Cap. Cur. Limit value.
0.95
Under Cap. Cur. Resume value.
0.97
Capacitor current Over THD: Action? Disable
Cap.Cur. Over THD limit value.
0.10
Cap.Cur. Over THD resume value.
0.08
Every step kVAr healthiness monitor. Disable
Step kVAr healthiness: tolerence.
0.10
Out of Banks Indication.
Disable
RTC Battery fault monitoring.
Enable

- 22 -

Min
Disable
0000
No
R-THD
No
Min
Non
0001
0001
Lead
0.70Lag
No
01
No

Min

Max
Enable
9999
Yes
F-THD
Yes
Max
Edible
9999
9999
Lag
0.85Lead
Yes
50
Yes

Max

Disable, Indicative, Off Step

0.90
0.85

1.20
1.15

Disable, Indicative, Off Step

0.70
0.75

0.95
1.00

Disable, Indicative, Off Step

1.10
1.05

1.30
1.25

Disable, Indicative, Off Step

0.01
0.02

0.20
0.25

Disable, Indicative, Off Step

005%

100%

Disable, Indicative, Off Step

1.05
1.00
No
15

1.50
1.45
Yes
900

Disable, Indicative, Off Step

0.75
0.80

0.98
1.00

Disable, Indicative, Off Step

0.02
0.01
Disable
0.03
Disable
Disable

0.99
0.90
Enable
0.50
Enable
Enable

Menu
Step

Parameter
No. of Steps
Step Vol
Corr. Time
Discharge Time
Step 1 KVAR
Step 2 KVAR
Step 3 KVAR
Step 4 KVAR
Step 5 KVAR
Step 6 KVAR

Meaning of Parameter
Number of Capacitor steps utilised
Voltage at which kVAr is defined
Correction cycle time.
Capacitor discharge time.
Step 1 kVAr value.
Step 2 kVAr value.
Step 3 kVAr value.
Step 4 kVAr value.
Step 5 kVAr value.
Step 6 kVAr value.

Menu
Parameter
Meaning of Parameter
Communication Unit ID
Communication ID of the unit
Baud Rate
Serial communication baud rate.
Time
RTC time to be set
Date
RTC date to be set
Init RTC
Initialise RTC?
Clear NVRAM Clear all contents on NV RAM?

Default
3
440
120 secs
120 secs
006
009
018
018
018
018

Min
1
380
010
010
001
001
001
001
001
001

Default
3001
09600
--No
No

Min
0000
04800
--No
No

Max
6
660
240
240
250
250
250
250
250
250

Max
9999
38400
--Yes
Yes

Note that all the parameters in the Sub-Menu Level 2 should be carefully filled in the
SPF-25. Failing to put the correct parameters can make SPF-25 to malfunction.
Its therefore advised that a trained person should only be allowed to change these
values.

- 23 -

Commissioning Instructions :
before panel is powered up for the first time.
1. Panel Wiring Check
Ensure that all connections in the panel is tightened properly and there are no
loose connections. Also ensure that the wiring is done as per the wiring
diagram.
2. Power Wiring Check
Ensure that the power cables are connected properly from the Panel I/C to the
feeder I/C or the transformer bushings. The connection has to be after the
Load Feed back CT looking from the Transformer side.
Ensure that the Bus Bars and/or Lugs are clean and free of Dust, Corrosion or
Oxidation on the contact sides so that good electrical connection is maintained.
The surface area should be flat so as to get maximum contact area.
If required Clean the Bus Bars and/ or Lugs by rubbing it with Polish Paper to
remove the oxidation layer. Provide contact paste in between the contacts
surfaces.
Not performing this, can result in to a weaker source point for Capacitor
charging during Step on and this can generate undesirable Noise which can
hamper the performance of equipments installed in the capacitor panel.
3. Load Feed Back CT connection.
Ensure that the load feed back CT connections are done properly. Confirm that
correct phase CT is connected with the correct phase input terminals. (Even
though auto sync is capable of taking care of wrong CT polarities or CT
position interchanging, but then on display, the Phase readings may be seen to
be interchanged. (May be R-phase reading would be seen in B-phase and
vice-versa.
CT connections to be done carefully so as to ensure that the wire does not get
open and there is no loose connection.

Loose connection’s or open CT secondary can result in to very high voltages
getting developed in the circuit which can damage the CT and also produce
high levels of noise in the system.

- 24 -

Fault Finding Guidelines :

Fault Type

Probable Reason

Action to Take

Unit Does not
turn ON. No
display on LCD.

•Input auxiliary supply
not coming.
•Input side fuses
blown

•Check the input
supply to restore
•Check fuses in the
unit for OK.

Unit does not
turn On any
capacitors even
if PF is below
Lower PF limit.

•If auto-sync failure
message is there at
Power On.

• Load may be highly
fluctuating so need of
manual
synchronisation only.
• This is OK
condition.

• The load KW is too
low with Under load
fault enable condition.
•Control connections
from SPF-25 to
contactor coils are not
proper

•Check control supply
and connections from
SPF-25 to contactors.

BF indication on
Default display.

• Internal Ni-Cd
3.2Vdc battery used
for RTC and NV RAM
must be drained down.

• Replace this battery
in consultancy with
TAS trained
personnel.

Some Capacitor
banks are
declared as
faulty even if
they are
checked to be
OK.

•Individual step health
monitoring is enabled
and tolerance limits
set are too stringent.
• Capacitor current
THD factor is
continuously
fluctuating.

•Set the tolerance
limits for individual
steps monitoring as
relaxed.
• With continuously
fluctuating THD of
Capacitor current and
higher level of THD
can cause some
errors in individual
step KVAR
measurement. Under
this condition, best is
to keep this feature
disabled.

- 25 -

Fault Finding Guidelines (continued):

Fault Type

Probable Reason

Action to Take

Serial
Communication
is not working.

• Baud rate selection
is not proper.
• Unit ID is not set
properly.
• Serial
communication cable
connections are not
proper.

• Select proper baud
rate.
• Set the unit ID
correctly.
• Check the serial
cable continuity as
per the connections
given earlier in this
manual.

Data logging is
not taking place.

• Possible that RTC
date is not set
properly.

• Change the battery
by help of TAS’s
authorised person.

SPF-25 resets
occasionally on
turning OFF of
any contactor.

• The contactor supply
phase may be the
same as used for SPF25 auxiliary supply.
• RC snubbers/ free
wheeling diodes are
not put with contactor
coils.

• Use the different
phase for control
supply of contactors
and for SPF-25 supply
• Usage of RC
snubbers / free
wheeling diodes is
mandatory.

- 26 -

Corporate Office/Works/Design Centre:
W-61, MIDC, Ambad, Nasik - 422010, Maharashtra (India)
Tel: +91-(253)-2384038 / 2381090
Email: [email protected]
Marketing and After-Sales Service:
A/58, Kamal Pushpa, K.C. Road, Bandra, Mumbai-400050.
Tel: +91-9930513923
Email: [email protected]
Regional Office: Delhi
191-B, Ground Floor, Padam Nagar (Filter Market),
New Delhi - 110007 (India).
Tel: +91-9911615701
Email: [email protected]


Slide 7

Operations Manual
SPF-25/6
AUTOMATIC POWER FACTOR
CONTROLLER

TAS Powertek Pvt. Ltd.
Corporate Office:
W-61, MIDC, Ambad, Nasik - 422010, Maharashtra (India)
Tel: +91-(253)-2384038 / 2381090
Email: [email protected]

NOTE
These instructions do not purport to cover all details or
variations in equipment, nor to provide for every possible
contingency to be met in connection with installation,
operation or maintenance.

Should further information be desired or should particular
problems arise which are not covered sufficiently for the
purchasers purposes, the matter should be referred to our
TAS Powertek Pvt. Ltd., office.
The contents of this instruction Manual shall not become
part of or modify any prior or existing agreement or
relationship. The sales contract contains the entire
obligations of TAS Powertek Pvt. Ltd. The warranty
contained in the contract between the parties is the sole
warranty of TAS Powertek Pvt. Ltd. Any statements
contained herein do not create new warranties or modify the
existing warranty.

The reproduction, transmission or use of this
document or its contents is not permitted
without express written authority. Offenders
will be liable for damages. All rights are
reserved.

Index
Index Page
-----------------Features & Specifications
----------Mechanical Dimensions/ mounting --------Functional Block diagram
-----------------PF correction technique
-----------------Back Side terminals
-----------------------Typical wiring scheme ---------------------Front Facia
---------------------------------Communication connector connections ----Display of various parameters / Status ---Method of Keyboard/Display usage -------Parameter Submenu -----------------------Commissioning Instruction (before Powerup)
Fault finding Guidelines ---------------------

-1-

1
2
3
4
5
6
7
8
9
10
19
22
24
25

Features:
• Totally Micro-processor controlled Digital Signal processing
logic for measurements.
• All measurements with 1.0 class accuracy.
• Automatic Synchronisation capable of giving the correct
results for wrong connections at CT terminals (even wrong
polarity of CTs).
• Measurement and kVAr compensation are frequency / THD
compensated.
• Load V,Iph, In and Cap. current THD measurement.
• Up-to 6 output banks control.
• Capable of doing the kVAr measurements on basis of mean
of the correction cycle time and provide kVAr compensation.
• Standard 144 X 144 cabinet for panel door flush mounting.
• Serial communication through standard TAS protocols.
• Manual testing mode for user checking of the Capacitor steps
switching.
• Protections provided (user settable):
Over/under Voltage
Cap. Over/under current / THD.
Over/Under frequency (internally set limits)
Over / Under load.
Load unbalance.
Capacitor individual step kVAr monitoring.
Out of steps: Under-compensation (only for indication)
NV-RAM battery down.
• Data logging for various parameters for 2months period at an
interval of 1hr.
• Unit comes along with PC (Windows compatible) software
for downloading and viewing the logged data.

Specifications:
•
•
•
•
•
•
•
•
•
•
•
•

Feed-back Voltage:440Volt (+10%/-30%)
Current input : 1Amp for load and capacitor feed-back.
Measurement Accuracy: Class 1.0
Auxiliary Supply: 525Vac to 300Vac.
Correction / Discharge time:
Selectable in seconds from 10sec. to 240sec.
Output commands:
NO contacts each with current rating of 0.5Amp AC. at
240Vac.
RS-232 baud rate selectable from 4.8kBPS to 38.4kBPS.
Operating temperature: 0 to 55oC.
1.0class measurement Operating temperature: 0 to 50oC.
Storage temperature: -10 to +75oC.
Humidity: 0 to 98%.
Supply frequency: 45Hz to 55Hz.

-2-

Mechanical Dimensions:
135

144

135

120
144

6

Recommended size for cutout on panel door is 138 X 138.
All Dimensions given are in mm.

Maximum weight: (with clamps and terminals) = 2.5kg.

-3-

Functional Block Diagram:
3 channel
Current f.b.

3
Channel
Cap.
Current
f.b.

3 channel
Voltage f.b.

SPF-25

V, I, PF and Power
Measurement
Block
For every AC mains
Cycle.

Calculation
Block for
• Energy Parameters
• Harmonic analysis

EEPROM
For Data
Logging

Keyboard,
Display and
Other support
Functions
Block.

RS-232 Serial
Communication.
TAS-01
Protocol stack.

Power Factor
Correction Block
+ event monitoring.

Outputs Commands
For Capacitor
Switching.

Power Supply
Block.

Above block diagram gives the functional blocks that are built into SPF-25 PF
correction relay.
These blocks are made up with the combination of functions from hardware and
corresponding firmware that resides in the Program memory of the micro-processor
used therein.
Even though the basic blocks exists as shown in the diagram, there functionality is
interdependent. The entire combination is carefully designed so as to have
minimum effects of Electrical and Electromagnetic noise level on the functionality of
this SPF-25.
The firmware written takes into various error handling eventualities so that the
functioning of this PF relay is error free and highly reliable.

-4-

PF correction technique:
KVAr Inductive

Target
PF.
Cos Φ
= PF

1.5 X kVAr
Of Smallest
Capacitor bank

KW

No change band.
KVAr Capacitive
Capacitor Addition band.
Capacitor Removal band.
SPF-25 for kVAr compensation works with the kW v/s kVAr diagram as shown here
above.
A band is created across the target PF value. (Target PF is set by user). This band
is of +0.75 of the smallest capacitor bank kVAr. Thus, total band width is always 1.5
times the smallest capacitor bank kVAr used. This is a no change band. If the
mains source parameters are within this band, SPF-25 would not change the
capacitors bank status.
If the mains parameters are out of this “No change band”, then SPF-25 calculates
the correct capacitor bank combination to be added / subtracted and within one
correction cycle brings it within the No change band.
The no change band width is selected as mentioned because it has to prevent unnecessary hunting (switching on/off) of the capacitor banks.

-5-

Back Side terminals:

Voltage
Feed-Back

Auxiliary
Supply

Current
Feed-Back
Output commands.

-6-

Capacitor
Current
Feed-Back

Typical Wiring with SPF-25 PF correction system.
L
O
A
D

L
C
R
+

L
C
R
-

L
C
Y
+

L
C
Y
-

L
C
B
+

L
C
B
-

PH 3
PH 2
PH 1
CCR+
CCRCCY+
CCYCCB+
CCB-

S
P
F
2
5

Auxiliary
Supply

L1
L2

Com
C01
C02
|

C06

Mains Connections:
Phase 1 control:
Neutral control:
Commands:
Load Current CT:
Capacitor Current CT:

-7-

Front Facia of SPF-25:
LCD Display

Step status LED indication
Serial Communication Port

Membrane Keypad

Usage of the UP and DN key makes the LCD display to scroll up
and down. This is used for display of various status as well as for
viewing the On line measured electrical values.
These keys are also used for changing values in Parameters
Editing mode and used for status changing of banks in Manual
mode.
Usage of ENT key is for entering the submenu and / or for setting
up some values.
The L and R keys are used in changing the position of the cursor
from Left to Right and vice-versa.

-8-

RS-232 serial communication 9 pin D connector:

5

4

6

3

7

2

8

1

9
RXD

GND

TXD

RS-232 cable connection Details:

PIN
NO

PC side
Connection

CONNECTION

SPF-25

1

NC

2

RXD

TXD

3

TXD

RXD

GND

GND

4
5
6
7
8
9

NC

-9-

Display of Various Parameters / Status:
PAGE: 00

COSΦ= -0.99 A OK

This is default display screen giving
information on PF, mode and
working status.

COSΦ= -0.99 :This part of the display indicates the Power Factor running value. The
sign –ve indicates that PF is Capacitive and no sign (+ve) indicates that PF is Inductive.
The PF indicated is the overall PF of the three phase system.
A or M :
This part either indicates the letter “A” or letter “M”. The letter A means
that SPF-25 is working in Auto mode.
The letter M means that SPF-25 is presently in Manual mode.
The Auto or Manual modes can be selected by pressing ENT key on this page.
(If Password option is enabled, enter the same by using UP/DN/L/R keys and then
Pressing ENT)
Then by UP or DN key you can stroll between the displays:
“1. Edit Mode”, “2. Auto Mode”, “3.Manual Mode”.
The first one “1.Edit Mode” is for parameter changing. The details of parameter changing
are explained in detail in later part of this manual.
The second and third one as display indicates are for selecting Auto or Manual mode
respectively. The ENT key pressed on selecting the mode desired, puts the SPF-25 into
that mode.
Auto Mode: In this mode SPF-25 works in automatic mode. It switches the capacitor
banks automatically depending on the parameter setting of target PF. This mode is the
default mode and is to be used for unmanned operation of the system controlled by
SPF-25.
Manual Mode: This mode is activated for checking/testing the capacitor banks switching.
Its also used for changing the Masking status of the capacitor banks. More on this is
explained later. (On Page 01 explanation)
OK or ** :
The last part of the display that is blinking every 500mS indicates the
working status of SPF-25. “OK” indicates that unit is working fine without any trip
conditions. If there is other indication, the meaning of the same can be as:
OK
:
No Fault
OC
:
Over Capacitor Current
UC
:
Under Capacitor Current
OL
:
Over Load
UL
:
Under Load
OV
:
Over Voltage
UV
:
Under Voltage
OF
:
Over Frequency
UF
:
Under Frequency
OH
:
Over Capacitor Current THD %.
OB
:
Out of Banks
LU
:
Load Unbalance
BF
:
Battery Failure (RTC)
NV
:
NVRAM Checksum Error
VA
:
Voltage Absent
- 10 -

PAGE: 01

PAGE: 01

______

AUTO

______

MAN

This display indicates the Bank status in Auto mode and in Manual mode it helps
to make the specific bank On or Off or declare masked.
: Means Bank is On.
: Means Bank is Off.
: Means Bank is Off and is declared masked (out of action)
: Means Bank does not exist for compensation.
When the Page 01 is in Auto mode, its only for indication of Bank status.
But in Manual mode, the “ENT” key press activates the manual control
mode. The cursor over the bank number starts blinking. The UP and DN
keys can turn On and Off the respective bank.
The DN key pressed puts the respective bank in Masking mode and another
press of DN key brings it out of Masking mode.

Putting the bank masking status permanently:
If a bank is to be permanently put in masked mode or is to be brought out of
permanent masked mode, it can be done by bringing the blinking cursor on
the position of the respective bank by use of L or R key. Then by pressing
DN key, bring the status of the bank to the required level (Masked or
Unmasked). Then press ENT key so that cursor stops blinking. After that by
pressing UP key go to Page 00. Then Press ENT. (If Password option is
enabled, enter the same by using UP/DN/L/R keys and then Press ENT)
“1.EDIT MODE” would be displayed. Press ENT one more time. “1.General
and IO” would be displayed. Press ENT again. “Pwd : Disable” or “Pwd :
Enable” would be displayed. Press UP key. “Exit: No Save” would be
displayed. Press ENT so that cursor will start blinking. Press UP. “Exit: With
Save” would be displayed with cursor blinking. Press ENT. “Saving in
EEPROM” would be displayed for a short time and then Page 00 would be
displayed.
You will observe that the bank status as requirement is changed
permanently to the status desired.

- 11 -

PAGE: 02

1.Overall Values
PRESS
PAGE: 02.1

Avg Vol: 415.7 V
PAGE: 02.2

Avg Cur: 0123.4A
PAGE: 02.3

Tot KW:

0081.2

PAGE: 02.4

TotKVAR: 0024.6
PAGE: 02.5

Tot KVA: 0101.1
PAGE: 02.6

Avg CC:

0031.3A

PAGE: 02.7

CKVAR:

028.35

PAGE: 02.8

LS PF:

0.82

PAGE: 02.9

LS KVAR: 0043.9
PAGE: 02.10

LS KVA:

0125.7

PAGE: 02.11

Freq:

49.9Hz

The Overall values Display menu has submenus as displayed above. As its
self explanatory it means:
Avg Vol: Average voltage of all the three line to line voltage values.
Avg Cur: Average current of all the three phase line current values.
Tot KW: Overall kW of the three phase system measured at source.
TotKVAR: Overall kVAr of the three phase system measured at source.
Tot KVA: Overall kVA of the three phase system measured at source.
Avg CC: Average of three phase current through capacitor panel.
CKVAR: Capacitive kVAr that is compensated by the system.
LS PF: Load side PF. (PF value if not compensated.
LS KVAR: Load side kVAr.
LS KVA: Load side kVA.
Freq: Supply frequency in Hz.
- 12 -

PAGE: 03

2.Per-Phase RMS

PRESS
PAGE: 03.1

R-Y Vol: 415.7 V
PAGE: 03.2

Y-B Vol: 415.7 V
PAGE: 03.3

B-R Vol: 415.7 V
PAGE: 03.4

Rph Cur: 0110.8A
PAGE: 03.5

Yph Cur: 0110.8A
PAGE: 03.6

Bph Cur: 0110.8A
PAGE: 03.7

Neutral: 0010.2A
PAGE: 03.8

Rph Cap: 0022.5A
PAGE: 03.9

Yph Cap: 0022.5A
PAGE: 03.10

Bph Cap: 0022.5A

Per Phase RMS: Submenu:
R-Y Vol: Measured AC Voltage RMS value across R and Y phase.
Y-B Vol: Measured AC Voltage RMS value across Y and B phase.
B-R Vol: Measured AC Voltage RMS value across B and R phase.
Rph Cur: Line current RMS value in R phase. Mains source.
Yph Cur: Line current RMS value in Y phase. Mains source.
Bph Cur: Line current RMS value in B phase. Mains source.
Neutral: Neutral current RMS value.
Rph Cap: Capacitor current RMS value in R phase.
Yph Cap: Capacitor current RMS value in Y phase.
Bph Cap: Capacitor current RMS value in B phase.

- 13 -

PAGE: 04

3.Power
PRESS
PAGE: 04.1

Rph PF:

PAGE: 04.10

1.00

Rph KVA: 0109.7

PAGE: 04.2

Yph PF:

PAGE: 04.11

1.00

Yph KVA: 0109.7

PAGE: 04.3

Bph PF:

PAGE: 04.12

1.00

Bph KVA: 0109.7

PAGE: 04.4

Rph KW:

PAGE: 04.13

0100.2

RphCKVAR: 010.76

PAGE: 04.5

Yph KW:

PAGE: 04.14

0100.2

YphCKVAR: 010.76

PAGE: 04.6

Bph KW:

PAGE: 04.15

0100.2

BphCKVAR: 010.76

PAGE: 04.7

PAGE: 04.16

RphKVAR: 0020.4

Rph mF

PAGE: 04.8

: 165.06

PAGE: 04.17

YphKVAR: 0020.4

Yph mF

PAGE: 04.9

: 165.06

PAGE: 04.18

BphKVAR: 0020.4

Bph mF

: 165.06

Power: Submenu:
Rph PF: Power Factor of R phase on mains source.
Yph PF: Power Factor of Y phase on mains source.
Bph PF: Power Factor of B phase on mains source.
Rph kW: Active Power in kW in R-phase.
Yph kW: Active Power in kW in Y-phase.
Bph kW: Active Power in kW in B-phase.
RphkVAR: Reactive Power in kVAr in R-phase.
YphkVAR: Reactive Power in kVAr in Y-phase.
BphkVAR: Reactive Power in kVAr in B-phase.
Rph KVA: Apparent Power in kVA in R-phase.
Yph KVA: Apparent Power in kVA in Y-phase.
Bph KVA: Apparent Power in kVA in B-phase.
RphCKVAR: Capacitor injected reactive power in R-phase.
YphCKVAR: Capacitor injected reactive power in Y-phase.
BphCKVAR: Capacitor injected reactive power in B-phase.
Rph mF: Capacitor value in micro-farad in R-phase.
Yph mF: Capacitor value in micro-farad in Y-phase.
Bph mF: Capacitor value in micro-farad in B-phase.
- 14 -

PAGE: 05

4.Energy
PRESS
PAGE: 05.1

KWH:

1234567.8

PAGE: 05.2

IndKVARH:12345.6
PAGE: 05.3

CapKVARH:12345.6
PAGE: 05.4

KVAH:

1234567.8

PAGE: 05.5

CKVARH:1234567.8

Energy: Submenu:
KWH: Overall cumulative active energy in kWh on Mains supply.
IndKVARH: Inductive reactive energy in kVArh on Mains supply.
CapKVARH: Capacitive reactive energy in kVArh on Mains supply.
KVAH: Overall cumulative apparent energy in kVA on Mains supply.
CKVARH: Capacitor compensated reactive energy in kVArh.

- 15 -

PAGE: 06

5.Harmonics
PRESS
PAGE: 06.1

Vr-THD-F: 002.4%
PAGE: 06.2

Vy-THD-F: 002.4%
PAGE: 06.3

Vb-THD-F: 002.4%
PAGE: 06.4

Ir-THD-F: 012.5%
PAGE: 06.5

Iy-THD-F: 012.5%
PAGE: 06.6

Ib-THD-F: 012.5%
PAGE: 06.7

In-THD-F: 005.0%
PAGE: 06.8

CCr-THD-F:028.2%
PAGE: 06.9

CCy-THD-F:028.2%
PAGE: 06.10

CCb-THD-F:028.2%

Harmonics: Submenu:
Vr-THD-F/R: R-Y line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Vy-THD-F/R: Y-B line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Vb-THD-F/R: B-R line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Ir-THD-F/R: R phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Iy-THD-F/R: Y phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Ib-THD-F/R: B phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
In-THD-F/R: Neutral current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
CCr-THD-F/R: R phase Capacitor current % Total Harmonic Distortion.
CCy-THD-F/R: Y phase Capacitor current % Total Harmonic Distortion.
CCb-THD-F/R: B phase Capacitor current % Total Harmonic Distortion.

- 16 -

PAGE: 07

6.Step KVAR
PRESS
PAGE: 07.1

Stp1 KVAR:0009.0
PAGE: 07.2

Stp2 KVAR:0009.0
PAGE: 07.3

Stp3 KVAR:0009.0
PAGE: 07.4

Stp4 KVAR:0009.0
PAGE: 07.5

Stp5 KVAR:0009.0
PAGE: 07.6

Stp6 KVAR:0009.0

Step KVAR: Submenu:
Stp1 KVAR: Step 1 kVAr value normalized at Capacitor rated voltage.
Stp2 KVAR: Step 2 kVAr value normalized at Capacitor rated voltage.
Stp3 KVAR: Step 3 kVAr value normalized at Capacitor rated voltage.
Stp4 KVAR: Step 4 kVAr value normalized at Capacitor rated voltage.
Stp5 KVAR: Step 5 kVAr value normalized at Capacitor rated voltage.
Stp6 KVAR: Step 6 kVAr value normalized at Capacitor rated voltage.

- 17 -

PAGE: 08

Time: 10:10:00
Real Time Clock: RTC time set in the SPF-25 is displayed here. Its in
HH:MM:SS format.

PAGE: 09

Date: 07:11:06
Real Time Clock: RTC date set in the SPF-25 is displayed here. Its in
dd:mm:yy format.

PAGE: 10

SPF-25 1.0.6

SPF-25 internal firmware version number is displayed here. (Just for user
information)

Total number of Main display pages are 11nos ranging from “00” to
“10”.

- 18 -

Method for Keyboard/Display usage.

Flow chart for entering into different modes:

PRESS
Enable

Default
Display
mode

If Password
Option is
Enable/Disable.

Disable

Enter Pwd: ****
PRESS
Enter the 4
Digit password
By use of
L, R, UP & DN
Keys.

PRESS

NO

IF
PASSWORD
Correct?

*

YES
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

1.Edit Mode

2.Auto Mode

3.Manual Mode

- 19 -

Parameter Editing Submenu Level 1:

*
1.General
2.System
3.Fault
4.Step
5.Communication

Sub-menu
Level 1
for
Parameter
Editing.

Parameter Editing
Sub-Menu
LEVEL 2

1.General and IO: Parameters related with general function and Input/Output
2. System: Electrical system (Mains supply) related parameters.

3. Fault: Setting Faults and fault levels.
4. Step: Capacitor Steps related parameters.
5. Communication: Parameters related with communication and data logging.

- 20 -

Parameter Editing Method:
(For Submenu Level 2 : L2)

Sub-Menu Level 1.
Cursor Blinking
at Parameter Values.

1.Submenu L2: ****

1.Submenu L2: ****
PRESS

key to increment value.

PRESS

Key to decrement value.

PRESS

Key to shift cursor Left.

PRESS

Key to shift cursor Right.
2.Submenu L2: ****

2.Submenu L2: ****
PRESS

key to increment value.

PRESS

Key to decrement value.

PRESS

Key to shift cursor Left.

PRESS

Key to shift cursor Right.

3.Submenu L2: ****

Exit: No Save

Exit: No Save

Without saving

Default
Display.

With saving

Screen for 1second

Saving In EEProm

Exit: With Save

- 21 -

Parameter Editing Submenu Level 2:
Menu
General

Parameter
Pwd
Ch-Pwd
Ld Def
THD
Rst. Energy

Meaning of Parameter
Password Control
Password value
Load all factory default parameters.
Type of THD factor to be displayed
Energy Counters reset to zero option

Default
Enable
1111
No
F-THD
No

Menu
System

Parameter
Meas. Vol.
Ld. Cur. Pr.
Cap. Cur. Pr.
PF Target
PF Target
Auto Sync
Async Tol.
Reset Async

Meaning of Parameter
Default
SPF-25 rated measurement voltage
440
Primary current value of mains CT
0180
0075
Primary current value of capacitor CT
Target PF for deciding Lag or Lead
Lag
1.00
Target PF exact value
Automatic synchronisation requirement Yes
% load variation tolerence for Auto-sync. 30
No
Reset Auto-sync to default value.

Menu
Fault

Parameter
Over Vol.
Over Vol. Lim
Over Vol. Clr
Under Vol.
Under Vol. Lim
Under Vol. Clr
Over Load
Over Ld. Lim
Over Ld. Clr
Under Ld.
Under Ld. Lim
Under Ld. Clr
Ld. Unbalance
Ld. Unb. Lim
Over CC
Over CC. Lim
Over CC. Clr
Over CC. Rst.
Over CC. Rst.
Under CC.
Under CC. Lim
Under CC. CLr
CC THD
CC THD Lim
CC THD Clr
Step Check
Cap. Cur Tol
Under Comp.
RTC Bat

Meaning of Parameter
Default
Over Voltage Fault: action by PDE-30 Off Step
Over Voltage activation limit value
1.10
Over Voltage resumption limit value 1.05
Under Voltage Fault: Action?
Off Step
Under Voltage activation limit value 0.70
Under Voltage resumption limit value 0.75
Over Load Fault: Action?
Indicate
Mains current over load limit value
1.30
Mains cur. over load resume value
1.25
Under Load on Mains: Action?
Indicate
Under load Activation limit value
0.03
Under load Resumption limit value
0.05
Load Un-balance Fault: Action?
Off Step
Load Un-balance limit
025%
Capacitor Over Current Fault: Action? Disable
Cap. Over Current Limit value.
1.30
Cap. Over Current Resume value.
1.25
Auto reset feature on Cap. Over Cur. No
If Over CC. Rst.=Yes. Time for reset. 120 sec
Under Capacitor current fault: Action? Disable
Under Cap. Cur. Limit value.
0.95
Under Cap. Cur. Resume value.
0.97
Capacitor current Over THD: Action? Disable
Cap.Cur. Over THD limit value.
0.10
Cap.Cur. Over THD resume value.
0.08
Every step kVAr healthiness monitor. Disable
Step kVAr healthiness: tolerence.
0.10
Out of Banks Indication.
Disable
RTC Battery fault monitoring.
Enable

- 22 -

Min
Disable
0000
No
R-THD
No
Min
Non
0001
0001
Lead
0.70Lag
No
01
No

Min

Max
Enable
9999
Yes
F-THD
Yes
Max
Edible
9999
9999
Lag
0.85Lead
Yes
50
Yes

Max

Disable, Indicative, Off Step

0.90
0.85

1.20
1.15

Disable, Indicative, Off Step

0.70
0.75

0.95
1.00

Disable, Indicative, Off Step

1.10
1.05

1.30
1.25

Disable, Indicative, Off Step

0.01
0.02

0.20
0.25

Disable, Indicative, Off Step

005%

100%

Disable, Indicative, Off Step

1.05
1.00
No
15

1.50
1.45
Yes
900

Disable, Indicative, Off Step

0.75
0.80

0.98
1.00

Disable, Indicative, Off Step

0.02
0.01
Disable
0.03
Disable
Disable

0.99
0.90
Enable
0.50
Enable
Enable

Menu
Step

Parameter
No. of Steps
Step Vol
Corr. Time
Discharge Time
Step 1 KVAR
Step 2 KVAR
Step 3 KVAR
Step 4 KVAR
Step 5 KVAR
Step 6 KVAR

Meaning of Parameter
Number of Capacitor steps utilised
Voltage at which kVAr is defined
Correction cycle time.
Capacitor discharge time.
Step 1 kVAr value.
Step 2 kVAr value.
Step 3 kVAr value.
Step 4 kVAr value.
Step 5 kVAr value.
Step 6 kVAr value.

Menu
Parameter
Meaning of Parameter
Communication Unit ID
Communication ID of the unit
Baud Rate
Serial communication baud rate.
Time
RTC time to be set
Date
RTC date to be set
Init RTC
Initialise RTC?
Clear NVRAM Clear all contents on NV RAM?

Default
3
440
120 secs
120 secs
006
009
018
018
018
018

Min
1
380
010
010
001
001
001
001
001
001

Default
3001
09600
--No
No

Min
0000
04800
--No
No

Max
6
660
240
240
250
250
250
250
250
250

Max
9999
38400
--Yes
Yes

Note that all the parameters in the Sub-Menu Level 2 should be carefully filled in the
SPF-25. Failing to put the correct parameters can make SPF-25 to malfunction.
Its therefore advised that a trained person should only be allowed to change these
values.

- 23 -

Commissioning Instructions :
before panel is powered up for the first time.
1. Panel Wiring Check
Ensure that all connections in the panel is tightened properly and there are no
loose connections. Also ensure that the wiring is done as per the wiring
diagram.
2. Power Wiring Check
Ensure that the power cables are connected properly from the Panel I/C to the
feeder I/C or the transformer bushings. The connection has to be after the
Load Feed back CT looking from the Transformer side.
Ensure that the Bus Bars and/or Lugs are clean and free of Dust, Corrosion or
Oxidation on the contact sides so that good electrical connection is maintained.
The surface area should be flat so as to get maximum contact area.
If required Clean the Bus Bars and/ or Lugs by rubbing it with Polish Paper to
remove the oxidation layer. Provide contact paste in between the contacts
surfaces.
Not performing this, can result in to a weaker source point for Capacitor
charging during Step on and this can generate undesirable Noise which can
hamper the performance of equipments installed in the capacitor panel.
3. Load Feed Back CT connection.
Ensure that the load feed back CT connections are done properly. Confirm that
correct phase CT is connected with the correct phase input terminals. (Even
though auto sync is capable of taking care of wrong CT polarities or CT
position interchanging, but then on display, the Phase readings may be seen to
be interchanged. (May be R-phase reading would be seen in B-phase and
vice-versa.
CT connections to be done carefully so as to ensure that the wire does not get
open and there is no loose connection.

Loose connection’s or open CT secondary can result in to very high voltages
getting developed in the circuit which can damage the CT and also produce
high levels of noise in the system.

- 24 -

Fault Finding Guidelines :

Fault Type

Probable Reason

Action to Take

Unit Does not
turn ON. No
display on LCD.

•Input auxiliary supply
not coming.
•Input side fuses
blown

•Check the input
supply to restore
•Check fuses in the
unit for OK.

Unit does not
turn On any
capacitors even
if PF is below
Lower PF limit.

•If auto-sync failure
message is there at
Power On.

• Load may be highly
fluctuating so need of
manual
synchronisation only.
• This is OK
condition.

• The load KW is too
low with Under load
fault enable condition.
•Control connections
from SPF-25 to
contactor coils are not
proper

•Check control supply
and connections from
SPF-25 to contactors.

BF indication on
Default display.

• Internal Ni-Cd
3.2Vdc battery used
for RTC and NV RAM
must be drained down.

• Replace this battery
in consultancy with
TAS trained
personnel.

Some Capacitor
banks are
declared as
faulty even if
they are
checked to be
OK.

•Individual step health
monitoring is enabled
and tolerance limits
set are too stringent.
• Capacitor current
THD factor is
continuously
fluctuating.

•Set the tolerance
limits for individual
steps monitoring as
relaxed.
• With continuously
fluctuating THD of
Capacitor current and
higher level of THD
can cause some
errors in individual
step KVAR
measurement. Under
this condition, best is
to keep this feature
disabled.

- 25 -

Fault Finding Guidelines (continued):

Fault Type

Probable Reason

Action to Take

Serial
Communication
is not working.

• Baud rate selection
is not proper.
• Unit ID is not set
properly.
• Serial
communication cable
connections are not
proper.

• Select proper baud
rate.
• Set the unit ID
correctly.
• Check the serial
cable continuity as
per the connections
given earlier in this
manual.

Data logging is
not taking place.

• Possible that RTC
date is not set
properly.

• Change the battery
by help of TAS’s
authorised person.

SPF-25 resets
occasionally on
turning OFF of
any contactor.

• The contactor supply
phase may be the
same as used for SPF25 auxiliary supply.
• RC snubbers/ free
wheeling diodes are
not put with contactor
coils.

• Use the different
phase for control
supply of contactors
and for SPF-25 supply
• Usage of RC
snubbers / free
wheeling diodes is
mandatory.

- 26 -

Corporate Office/Works/Design Centre:
W-61, MIDC, Ambad, Nasik - 422010, Maharashtra (India)
Tel: +91-(253)-2384038 / 2381090
Email: [email protected]
Marketing and After-Sales Service:
A/58, Kamal Pushpa, K.C. Road, Bandra, Mumbai-400050.
Tel: +91-9930513923
Email: [email protected]
Regional Office: Delhi
191-B, Ground Floor, Padam Nagar (Filter Market),
New Delhi - 110007 (India).
Tel: +91-9911615701
Email: [email protected]


Slide 8

Operations Manual
SPF-25/6
AUTOMATIC POWER FACTOR
CONTROLLER

TAS Powertek Pvt. Ltd.
Corporate Office:
W-61, MIDC, Ambad, Nasik - 422010, Maharashtra (India)
Tel: +91-(253)-2384038 / 2381090
Email: [email protected]

NOTE
These instructions do not purport to cover all details or
variations in equipment, nor to provide for every possible
contingency to be met in connection with installation,
operation or maintenance.

Should further information be desired or should particular
problems arise which are not covered sufficiently for the
purchasers purposes, the matter should be referred to our
TAS Powertek Pvt. Ltd., office.
The contents of this instruction Manual shall not become
part of or modify any prior or existing agreement or
relationship. The sales contract contains the entire
obligations of TAS Powertek Pvt. Ltd. The warranty
contained in the contract between the parties is the sole
warranty of TAS Powertek Pvt. Ltd. Any statements
contained herein do not create new warranties or modify the
existing warranty.

The reproduction, transmission or use of this
document or its contents is not permitted
without express written authority. Offenders
will be liable for damages. All rights are
reserved.

Index
Index Page
-----------------Features & Specifications
----------Mechanical Dimensions/ mounting --------Functional Block diagram
-----------------PF correction technique
-----------------Back Side terminals
-----------------------Typical wiring scheme ---------------------Front Facia
---------------------------------Communication connector connections ----Display of various parameters / Status ---Method of Keyboard/Display usage -------Parameter Submenu -----------------------Commissioning Instruction (before Powerup)
Fault finding Guidelines ---------------------

-1-

1
2
3
4
5
6
7
8
9
10
19
22
24
25

Features:
• Totally Micro-processor controlled Digital Signal processing
logic for measurements.
• All measurements with 1.0 class accuracy.
• Automatic Synchronisation capable of giving the correct
results for wrong connections at CT terminals (even wrong
polarity of CTs).
• Measurement and kVAr compensation are frequency / THD
compensated.
• Load V,Iph, In and Cap. current THD measurement.
• Up-to 6 output banks control.
• Capable of doing the kVAr measurements on basis of mean
of the correction cycle time and provide kVAr compensation.
• Standard 144 X 144 cabinet for panel door flush mounting.
• Serial communication through standard TAS protocols.
• Manual testing mode for user checking of the Capacitor steps
switching.
• Protections provided (user settable):
Over/under Voltage
Cap. Over/under current / THD.
Over/Under frequency (internally set limits)
Over / Under load.
Load unbalance.
Capacitor individual step kVAr monitoring.
Out of steps: Under-compensation (only for indication)
NV-RAM battery down.
• Data logging for various parameters for 2months period at an
interval of 1hr.
• Unit comes along with PC (Windows compatible) software
for downloading and viewing the logged data.

Specifications:
•
•
•
•
•
•
•
•
•
•
•
•

Feed-back Voltage:440Volt (+10%/-30%)
Current input : 1Amp for load and capacitor feed-back.
Measurement Accuracy: Class 1.0
Auxiliary Supply: 525Vac to 300Vac.
Correction / Discharge time:
Selectable in seconds from 10sec. to 240sec.
Output commands:
NO contacts each with current rating of 0.5Amp AC. at
240Vac.
RS-232 baud rate selectable from 4.8kBPS to 38.4kBPS.
Operating temperature: 0 to 55oC.
1.0class measurement Operating temperature: 0 to 50oC.
Storage temperature: -10 to +75oC.
Humidity: 0 to 98%.
Supply frequency: 45Hz to 55Hz.

-2-

Mechanical Dimensions:
135

144

135

120
144

6

Recommended size for cutout on panel door is 138 X 138.
All Dimensions given are in mm.

Maximum weight: (with clamps and terminals) = 2.5kg.

-3-

Functional Block Diagram:
3 channel
Current f.b.

3
Channel
Cap.
Current
f.b.

3 channel
Voltage f.b.

SPF-25

V, I, PF and Power
Measurement
Block
For every AC mains
Cycle.

Calculation
Block for
• Energy Parameters
• Harmonic analysis

EEPROM
For Data
Logging

Keyboard,
Display and
Other support
Functions
Block.

RS-232 Serial
Communication.
TAS-01
Protocol stack.

Power Factor
Correction Block
+ event monitoring.

Outputs Commands
For Capacitor
Switching.

Power Supply
Block.

Above block diagram gives the functional blocks that are built into SPF-25 PF
correction relay.
These blocks are made up with the combination of functions from hardware and
corresponding firmware that resides in the Program memory of the micro-processor
used therein.
Even though the basic blocks exists as shown in the diagram, there functionality is
interdependent. The entire combination is carefully designed so as to have
minimum effects of Electrical and Electromagnetic noise level on the functionality of
this SPF-25.
The firmware written takes into various error handling eventualities so that the
functioning of this PF relay is error free and highly reliable.

-4-

PF correction technique:
KVAr Inductive

Target
PF.
Cos Φ
= PF

1.5 X kVAr
Of Smallest
Capacitor bank

KW

No change band.
KVAr Capacitive
Capacitor Addition band.
Capacitor Removal band.
SPF-25 for kVAr compensation works with the kW v/s kVAr diagram as shown here
above.
A band is created across the target PF value. (Target PF is set by user). This band
is of +0.75 of the smallest capacitor bank kVAr. Thus, total band width is always 1.5
times the smallest capacitor bank kVAr used. This is a no change band. If the
mains source parameters are within this band, SPF-25 would not change the
capacitors bank status.
If the mains parameters are out of this “No change band”, then SPF-25 calculates
the correct capacitor bank combination to be added / subtracted and within one
correction cycle brings it within the No change band.
The no change band width is selected as mentioned because it has to prevent unnecessary hunting (switching on/off) of the capacitor banks.

-5-

Back Side terminals:

Voltage
Feed-Back

Auxiliary
Supply

Current
Feed-Back
Output commands.

-6-

Capacitor
Current
Feed-Back

Typical Wiring with SPF-25 PF correction system.
L
O
A
D

L
C
R
+

L
C
R
-

L
C
Y
+

L
C
Y
-

L
C
B
+

L
C
B
-

PH 3
PH 2
PH 1
CCR+
CCRCCY+
CCYCCB+
CCB-

S
P
F
2
5

Auxiliary
Supply

L1
L2

Com
C01
C02
|

C06

Mains Connections:
Phase 1 control:
Neutral control:
Commands:
Load Current CT:
Capacitor Current CT:

-7-

Front Facia of SPF-25:
LCD Display

Step status LED indication
Serial Communication Port

Membrane Keypad

Usage of the UP and DN key makes the LCD display to scroll up
and down. This is used for display of various status as well as for
viewing the On line measured electrical values.
These keys are also used for changing values in Parameters
Editing mode and used for status changing of banks in Manual
mode.
Usage of ENT key is for entering the submenu and / or for setting
up some values.
The L and R keys are used in changing the position of the cursor
from Left to Right and vice-versa.

-8-

RS-232 serial communication 9 pin D connector:

5

4

6

3

7

2

8

1

9
RXD

GND

TXD

RS-232 cable connection Details:

PIN
NO

PC side
Connection

CONNECTION

SPF-25

1

NC

2

RXD

TXD

3

TXD

RXD

GND

GND

4
5
6
7
8
9

NC

-9-

Display of Various Parameters / Status:
PAGE: 00

COSΦ= -0.99 A OK

This is default display screen giving
information on PF, mode and
working status.

COSΦ= -0.99 :This part of the display indicates the Power Factor running value. The
sign –ve indicates that PF is Capacitive and no sign (+ve) indicates that PF is Inductive.
The PF indicated is the overall PF of the three phase system.
A or M :
This part either indicates the letter “A” or letter “M”. The letter A means
that SPF-25 is working in Auto mode.
The letter M means that SPF-25 is presently in Manual mode.
The Auto or Manual modes can be selected by pressing ENT key on this page.
(If Password option is enabled, enter the same by using UP/DN/L/R keys and then
Pressing ENT)
Then by UP or DN key you can stroll between the displays:
“1. Edit Mode”, “2. Auto Mode”, “3.Manual Mode”.
The first one “1.Edit Mode” is for parameter changing. The details of parameter changing
are explained in detail in later part of this manual.
The second and third one as display indicates are for selecting Auto or Manual mode
respectively. The ENT key pressed on selecting the mode desired, puts the SPF-25 into
that mode.
Auto Mode: In this mode SPF-25 works in automatic mode. It switches the capacitor
banks automatically depending on the parameter setting of target PF. This mode is the
default mode and is to be used for unmanned operation of the system controlled by
SPF-25.
Manual Mode: This mode is activated for checking/testing the capacitor banks switching.
Its also used for changing the Masking status of the capacitor banks. More on this is
explained later. (On Page 01 explanation)
OK or ** :
The last part of the display that is blinking every 500mS indicates the
working status of SPF-25. “OK” indicates that unit is working fine without any trip
conditions. If there is other indication, the meaning of the same can be as:
OK
:
No Fault
OC
:
Over Capacitor Current
UC
:
Under Capacitor Current
OL
:
Over Load
UL
:
Under Load
OV
:
Over Voltage
UV
:
Under Voltage
OF
:
Over Frequency
UF
:
Under Frequency
OH
:
Over Capacitor Current THD %.
OB
:
Out of Banks
LU
:
Load Unbalance
BF
:
Battery Failure (RTC)
NV
:
NVRAM Checksum Error
VA
:
Voltage Absent
- 10 -

PAGE: 01

PAGE: 01

______

AUTO

______

MAN

This display indicates the Bank status in Auto mode and in Manual mode it helps
to make the specific bank On or Off or declare masked.
: Means Bank is On.
: Means Bank is Off.
: Means Bank is Off and is declared masked (out of action)
: Means Bank does not exist for compensation.
When the Page 01 is in Auto mode, its only for indication of Bank status.
But in Manual mode, the “ENT” key press activates the manual control
mode. The cursor over the bank number starts blinking. The UP and DN
keys can turn On and Off the respective bank.
The DN key pressed puts the respective bank in Masking mode and another
press of DN key brings it out of Masking mode.

Putting the bank masking status permanently:
If a bank is to be permanently put in masked mode or is to be brought out of
permanent masked mode, it can be done by bringing the blinking cursor on
the position of the respective bank by use of L or R key. Then by pressing
DN key, bring the status of the bank to the required level (Masked or
Unmasked). Then press ENT key so that cursor stops blinking. After that by
pressing UP key go to Page 00. Then Press ENT. (If Password option is
enabled, enter the same by using UP/DN/L/R keys and then Press ENT)
“1.EDIT MODE” would be displayed. Press ENT one more time. “1.General
and IO” would be displayed. Press ENT again. “Pwd : Disable” or “Pwd :
Enable” would be displayed. Press UP key. “Exit: No Save” would be
displayed. Press ENT so that cursor will start blinking. Press UP. “Exit: With
Save” would be displayed with cursor blinking. Press ENT. “Saving in
EEPROM” would be displayed for a short time and then Page 00 would be
displayed.
You will observe that the bank status as requirement is changed
permanently to the status desired.

- 11 -

PAGE: 02

1.Overall Values
PRESS
PAGE: 02.1

Avg Vol: 415.7 V
PAGE: 02.2

Avg Cur: 0123.4A
PAGE: 02.3

Tot KW:

0081.2

PAGE: 02.4

TotKVAR: 0024.6
PAGE: 02.5

Tot KVA: 0101.1
PAGE: 02.6

Avg CC:

0031.3A

PAGE: 02.7

CKVAR:

028.35

PAGE: 02.8

LS PF:

0.82

PAGE: 02.9

LS KVAR: 0043.9
PAGE: 02.10

LS KVA:

0125.7

PAGE: 02.11

Freq:

49.9Hz

The Overall values Display menu has submenus as displayed above. As its
self explanatory it means:
Avg Vol: Average voltage of all the three line to line voltage values.
Avg Cur: Average current of all the three phase line current values.
Tot KW: Overall kW of the three phase system measured at source.
TotKVAR: Overall kVAr of the three phase system measured at source.
Tot KVA: Overall kVA of the three phase system measured at source.
Avg CC: Average of three phase current through capacitor panel.
CKVAR: Capacitive kVAr that is compensated by the system.
LS PF: Load side PF. (PF value if not compensated.
LS KVAR: Load side kVAr.
LS KVA: Load side kVA.
Freq: Supply frequency in Hz.
- 12 -

PAGE: 03

2.Per-Phase RMS

PRESS
PAGE: 03.1

R-Y Vol: 415.7 V
PAGE: 03.2

Y-B Vol: 415.7 V
PAGE: 03.3

B-R Vol: 415.7 V
PAGE: 03.4

Rph Cur: 0110.8A
PAGE: 03.5

Yph Cur: 0110.8A
PAGE: 03.6

Bph Cur: 0110.8A
PAGE: 03.7

Neutral: 0010.2A
PAGE: 03.8

Rph Cap: 0022.5A
PAGE: 03.9

Yph Cap: 0022.5A
PAGE: 03.10

Bph Cap: 0022.5A

Per Phase RMS: Submenu:
R-Y Vol: Measured AC Voltage RMS value across R and Y phase.
Y-B Vol: Measured AC Voltage RMS value across Y and B phase.
B-R Vol: Measured AC Voltage RMS value across B and R phase.
Rph Cur: Line current RMS value in R phase. Mains source.
Yph Cur: Line current RMS value in Y phase. Mains source.
Bph Cur: Line current RMS value in B phase. Mains source.
Neutral: Neutral current RMS value.
Rph Cap: Capacitor current RMS value in R phase.
Yph Cap: Capacitor current RMS value in Y phase.
Bph Cap: Capacitor current RMS value in B phase.

- 13 -

PAGE: 04

3.Power
PRESS
PAGE: 04.1

Rph PF:

PAGE: 04.10

1.00

Rph KVA: 0109.7

PAGE: 04.2

Yph PF:

PAGE: 04.11

1.00

Yph KVA: 0109.7

PAGE: 04.3

Bph PF:

PAGE: 04.12

1.00

Bph KVA: 0109.7

PAGE: 04.4

Rph KW:

PAGE: 04.13

0100.2

RphCKVAR: 010.76

PAGE: 04.5

Yph KW:

PAGE: 04.14

0100.2

YphCKVAR: 010.76

PAGE: 04.6

Bph KW:

PAGE: 04.15

0100.2

BphCKVAR: 010.76

PAGE: 04.7

PAGE: 04.16

RphKVAR: 0020.4

Rph mF

PAGE: 04.8

: 165.06

PAGE: 04.17

YphKVAR: 0020.4

Yph mF

PAGE: 04.9

: 165.06

PAGE: 04.18

BphKVAR: 0020.4

Bph mF

: 165.06

Power: Submenu:
Rph PF: Power Factor of R phase on mains source.
Yph PF: Power Factor of Y phase on mains source.
Bph PF: Power Factor of B phase on mains source.
Rph kW: Active Power in kW in R-phase.
Yph kW: Active Power in kW in Y-phase.
Bph kW: Active Power in kW in B-phase.
RphkVAR: Reactive Power in kVAr in R-phase.
YphkVAR: Reactive Power in kVAr in Y-phase.
BphkVAR: Reactive Power in kVAr in B-phase.
Rph KVA: Apparent Power in kVA in R-phase.
Yph KVA: Apparent Power in kVA in Y-phase.
Bph KVA: Apparent Power in kVA in B-phase.
RphCKVAR: Capacitor injected reactive power in R-phase.
YphCKVAR: Capacitor injected reactive power in Y-phase.
BphCKVAR: Capacitor injected reactive power in B-phase.
Rph mF: Capacitor value in micro-farad in R-phase.
Yph mF: Capacitor value in micro-farad in Y-phase.
Bph mF: Capacitor value in micro-farad in B-phase.
- 14 -

PAGE: 05

4.Energy
PRESS
PAGE: 05.1

KWH:

1234567.8

PAGE: 05.2

IndKVARH:12345.6
PAGE: 05.3

CapKVARH:12345.6
PAGE: 05.4

KVAH:

1234567.8

PAGE: 05.5

CKVARH:1234567.8

Energy: Submenu:
KWH: Overall cumulative active energy in kWh on Mains supply.
IndKVARH: Inductive reactive energy in kVArh on Mains supply.
CapKVARH: Capacitive reactive energy in kVArh on Mains supply.
KVAH: Overall cumulative apparent energy in kVA on Mains supply.
CKVARH: Capacitor compensated reactive energy in kVArh.

- 15 -

PAGE: 06

5.Harmonics
PRESS
PAGE: 06.1

Vr-THD-F: 002.4%
PAGE: 06.2

Vy-THD-F: 002.4%
PAGE: 06.3

Vb-THD-F: 002.4%
PAGE: 06.4

Ir-THD-F: 012.5%
PAGE: 06.5

Iy-THD-F: 012.5%
PAGE: 06.6

Ib-THD-F: 012.5%
PAGE: 06.7

In-THD-F: 005.0%
PAGE: 06.8

CCr-THD-F:028.2%
PAGE: 06.9

CCy-THD-F:028.2%
PAGE: 06.10

CCb-THD-F:028.2%

Harmonics: Submenu:
Vr-THD-F/R: R-Y line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Vy-THD-F/R: Y-B line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Vb-THD-F/R: B-R line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Ir-THD-F/R: R phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Iy-THD-F/R: Y phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Ib-THD-F/R: B phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
In-THD-F/R: Neutral current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
CCr-THD-F/R: R phase Capacitor current % Total Harmonic Distortion.
CCy-THD-F/R: Y phase Capacitor current % Total Harmonic Distortion.
CCb-THD-F/R: B phase Capacitor current % Total Harmonic Distortion.

- 16 -

PAGE: 07

6.Step KVAR
PRESS
PAGE: 07.1

Stp1 KVAR:0009.0
PAGE: 07.2

Stp2 KVAR:0009.0
PAGE: 07.3

Stp3 KVAR:0009.0
PAGE: 07.4

Stp4 KVAR:0009.0
PAGE: 07.5

Stp5 KVAR:0009.0
PAGE: 07.6

Stp6 KVAR:0009.0

Step KVAR: Submenu:
Stp1 KVAR: Step 1 kVAr value normalized at Capacitor rated voltage.
Stp2 KVAR: Step 2 kVAr value normalized at Capacitor rated voltage.
Stp3 KVAR: Step 3 kVAr value normalized at Capacitor rated voltage.
Stp4 KVAR: Step 4 kVAr value normalized at Capacitor rated voltage.
Stp5 KVAR: Step 5 kVAr value normalized at Capacitor rated voltage.
Stp6 KVAR: Step 6 kVAr value normalized at Capacitor rated voltage.

- 17 -

PAGE: 08

Time: 10:10:00
Real Time Clock: RTC time set in the SPF-25 is displayed here. Its in
HH:MM:SS format.

PAGE: 09

Date: 07:11:06
Real Time Clock: RTC date set in the SPF-25 is displayed here. Its in
dd:mm:yy format.

PAGE: 10

SPF-25 1.0.6

SPF-25 internal firmware version number is displayed here. (Just for user
information)

Total number of Main display pages are 11nos ranging from “00” to
“10”.

- 18 -

Method for Keyboard/Display usage.

Flow chart for entering into different modes:

PRESS
Enable

Default
Display
mode

If Password
Option is
Enable/Disable.

Disable

Enter Pwd: ****
PRESS
Enter the 4
Digit password
By use of
L, R, UP & DN
Keys.

PRESS

NO

IF
PASSWORD
Correct?

*

YES
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

1.Edit Mode

2.Auto Mode

3.Manual Mode

- 19 -

Parameter Editing Submenu Level 1:

*
1.General
2.System
3.Fault
4.Step
5.Communication

Sub-menu
Level 1
for
Parameter
Editing.

Parameter Editing
Sub-Menu
LEVEL 2

1.General and IO: Parameters related with general function and Input/Output
2. System: Electrical system (Mains supply) related parameters.

3. Fault: Setting Faults and fault levels.
4. Step: Capacitor Steps related parameters.
5. Communication: Parameters related with communication and data logging.

- 20 -

Parameter Editing Method:
(For Submenu Level 2 : L2)

Sub-Menu Level 1.
Cursor Blinking
at Parameter Values.

1.Submenu L2: ****

1.Submenu L2: ****
PRESS

key to increment value.

PRESS

Key to decrement value.

PRESS

Key to shift cursor Left.

PRESS

Key to shift cursor Right.
2.Submenu L2: ****

2.Submenu L2: ****
PRESS

key to increment value.

PRESS

Key to decrement value.

PRESS

Key to shift cursor Left.

PRESS

Key to shift cursor Right.

3.Submenu L2: ****

Exit: No Save

Exit: No Save

Without saving

Default
Display.

With saving

Screen for 1second

Saving In EEProm

Exit: With Save

- 21 -

Parameter Editing Submenu Level 2:
Menu
General

Parameter
Pwd
Ch-Pwd
Ld Def
THD
Rst. Energy

Meaning of Parameter
Password Control
Password value
Load all factory default parameters.
Type of THD factor to be displayed
Energy Counters reset to zero option

Default
Enable
1111
No
F-THD
No

Menu
System

Parameter
Meas. Vol.
Ld. Cur. Pr.
Cap. Cur. Pr.
PF Target
PF Target
Auto Sync
Async Tol.
Reset Async

Meaning of Parameter
Default
SPF-25 rated measurement voltage
440
Primary current value of mains CT
0180
0075
Primary current value of capacitor CT
Target PF for deciding Lag or Lead
Lag
1.00
Target PF exact value
Automatic synchronisation requirement Yes
% load variation tolerence for Auto-sync. 30
No
Reset Auto-sync to default value.

Menu
Fault

Parameter
Over Vol.
Over Vol. Lim
Over Vol. Clr
Under Vol.
Under Vol. Lim
Under Vol. Clr
Over Load
Over Ld. Lim
Over Ld. Clr
Under Ld.
Under Ld. Lim
Under Ld. Clr
Ld. Unbalance
Ld. Unb. Lim
Over CC
Over CC. Lim
Over CC. Clr
Over CC. Rst.
Over CC. Rst.
Under CC.
Under CC. Lim
Under CC. CLr
CC THD
CC THD Lim
CC THD Clr
Step Check
Cap. Cur Tol
Under Comp.
RTC Bat

Meaning of Parameter
Default
Over Voltage Fault: action by PDE-30 Off Step
Over Voltage activation limit value
1.10
Over Voltage resumption limit value 1.05
Under Voltage Fault: Action?
Off Step
Under Voltage activation limit value 0.70
Under Voltage resumption limit value 0.75
Over Load Fault: Action?
Indicate
Mains current over load limit value
1.30
Mains cur. over load resume value
1.25
Under Load on Mains: Action?
Indicate
Under load Activation limit value
0.03
Under load Resumption limit value
0.05
Load Un-balance Fault: Action?
Off Step
Load Un-balance limit
025%
Capacitor Over Current Fault: Action? Disable
Cap. Over Current Limit value.
1.30
Cap. Over Current Resume value.
1.25
Auto reset feature on Cap. Over Cur. No
If Over CC. Rst.=Yes. Time for reset. 120 sec
Under Capacitor current fault: Action? Disable
Under Cap. Cur. Limit value.
0.95
Under Cap. Cur. Resume value.
0.97
Capacitor current Over THD: Action? Disable
Cap.Cur. Over THD limit value.
0.10
Cap.Cur. Over THD resume value.
0.08
Every step kVAr healthiness monitor. Disable
Step kVAr healthiness: tolerence.
0.10
Out of Banks Indication.
Disable
RTC Battery fault monitoring.
Enable

- 22 -

Min
Disable
0000
No
R-THD
No
Min
Non
0001
0001
Lead
0.70Lag
No
01
No

Min

Max
Enable
9999
Yes
F-THD
Yes
Max
Edible
9999
9999
Lag
0.85Lead
Yes
50
Yes

Max

Disable, Indicative, Off Step

0.90
0.85

1.20
1.15

Disable, Indicative, Off Step

0.70
0.75

0.95
1.00

Disable, Indicative, Off Step

1.10
1.05

1.30
1.25

Disable, Indicative, Off Step

0.01
0.02

0.20
0.25

Disable, Indicative, Off Step

005%

100%

Disable, Indicative, Off Step

1.05
1.00
No
15

1.50
1.45
Yes
900

Disable, Indicative, Off Step

0.75
0.80

0.98
1.00

Disable, Indicative, Off Step

0.02
0.01
Disable
0.03
Disable
Disable

0.99
0.90
Enable
0.50
Enable
Enable

Menu
Step

Parameter
No. of Steps
Step Vol
Corr. Time
Discharge Time
Step 1 KVAR
Step 2 KVAR
Step 3 KVAR
Step 4 KVAR
Step 5 KVAR
Step 6 KVAR

Meaning of Parameter
Number of Capacitor steps utilised
Voltage at which kVAr is defined
Correction cycle time.
Capacitor discharge time.
Step 1 kVAr value.
Step 2 kVAr value.
Step 3 kVAr value.
Step 4 kVAr value.
Step 5 kVAr value.
Step 6 kVAr value.

Menu
Parameter
Meaning of Parameter
Communication Unit ID
Communication ID of the unit
Baud Rate
Serial communication baud rate.
Time
RTC time to be set
Date
RTC date to be set
Init RTC
Initialise RTC?
Clear NVRAM Clear all contents on NV RAM?

Default
3
440
120 secs
120 secs
006
009
018
018
018
018

Min
1
380
010
010
001
001
001
001
001
001

Default
3001
09600
--No
No

Min
0000
04800
--No
No

Max
6
660
240
240
250
250
250
250
250
250

Max
9999
38400
--Yes
Yes

Note that all the parameters in the Sub-Menu Level 2 should be carefully filled in the
SPF-25. Failing to put the correct parameters can make SPF-25 to malfunction.
Its therefore advised that a trained person should only be allowed to change these
values.

- 23 -

Commissioning Instructions :
before panel is powered up for the first time.
1. Panel Wiring Check
Ensure that all connections in the panel is tightened properly and there are no
loose connections. Also ensure that the wiring is done as per the wiring
diagram.
2. Power Wiring Check
Ensure that the power cables are connected properly from the Panel I/C to the
feeder I/C or the transformer bushings. The connection has to be after the
Load Feed back CT looking from the Transformer side.
Ensure that the Bus Bars and/or Lugs are clean and free of Dust, Corrosion or
Oxidation on the contact sides so that good electrical connection is maintained.
The surface area should be flat so as to get maximum contact area.
If required Clean the Bus Bars and/ or Lugs by rubbing it with Polish Paper to
remove the oxidation layer. Provide contact paste in between the contacts
surfaces.
Not performing this, can result in to a weaker source point for Capacitor
charging during Step on and this can generate undesirable Noise which can
hamper the performance of equipments installed in the capacitor panel.
3. Load Feed Back CT connection.
Ensure that the load feed back CT connections are done properly. Confirm that
correct phase CT is connected with the correct phase input terminals. (Even
though auto sync is capable of taking care of wrong CT polarities or CT
position interchanging, but then on display, the Phase readings may be seen to
be interchanged. (May be R-phase reading would be seen in B-phase and
vice-versa.
CT connections to be done carefully so as to ensure that the wire does not get
open and there is no loose connection.

Loose connection’s or open CT secondary can result in to very high voltages
getting developed in the circuit which can damage the CT and also produce
high levels of noise in the system.

- 24 -

Fault Finding Guidelines :

Fault Type

Probable Reason

Action to Take

Unit Does not
turn ON. No
display on LCD.

•Input auxiliary supply
not coming.
•Input side fuses
blown

•Check the input
supply to restore
•Check fuses in the
unit for OK.

Unit does not
turn On any
capacitors even
if PF is below
Lower PF limit.

•If auto-sync failure
message is there at
Power On.

• Load may be highly
fluctuating so need of
manual
synchronisation only.
• This is OK
condition.

• The load KW is too
low with Under load
fault enable condition.
•Control connections
from SPF-25 to
contactor coils are not
proper

•Check control supply
and connections from
SPF-25 to contactors.

BF indication on
Default display.

• Internal Ni-Cd
3.2Vdc battery used
for RTC and NV RAM
must be drained down.

• Replace this battery
in consultancy with
TAS trained
personnel.

Some Capacitor
banks are
declared as
faulty even if
they are
checked to be
OK.

•Individual step health
monitoring is enabled
and tolerance limits
set are too stringent.
• Capacitor current
THD factor is
continuously
fluctuating.

•Set the tolerance
limits for individual
steps monitoring as
relaxed.
• With continuously
fluctuating THD of
Capacitor current and
higher level of THD
can cause some
errors in individual
step KVAR
measurement. Under
this condition, best is
to keep this feature
disabled.

- 25 -

Fault Finding Guidelines (continued):

Fault Type

Probable Reason

Action to Take

Serial
Communication
is not working.

• Baud rate selection
is not proper.
• Unit ID is not set
properly.
• Serial
communication cable
connections are not
proper.

• Select proper baud
rate.
• Set the unit ID
correctly.
• Check the serial
cable continuity as
per the connections
given earlier in this
manual.

Data logging is
not taking place.

• Possible that RTC
date is not set
properly.

• Change the battery
by help of TAS’s
authorised person.

SPF-25 resets
occasionally on
turning OFF of
any contactor.

• The contactor supply
phase may be the
same as used for SPF25 auxiliary supply.
• RC snubbers/ free
wheeling diodes are
not put with contactor
coils.

• Use the different
phase for control
supply of contactors
and for SPF-25 supply
• Usage of RC
snubbers / free
wheeling diodes is
mandatory.

- 26 -

Corporate Office/Works/Design Centre:
W-61, MIDC, Ambad, Nasik - 422010, Maharashtra (India)
Tel: +91-(253)-2384038 / 2381090
Email: [email protected]
Marketing and After-Sales Service:
A/58, Kamal Pushpa, K.C. Road, Bandra, Mumbai-400050.
Tel: +91-9930513923
Email: [email protected]
Regional Office: Delhi
191-B, Ground Floor, Padam Nagar (Filter Market),
New Delhi - 110007 (India).
Tel: +91-9911615701
Email: [email protected]


Slide 9

Operations Manual
SPF-25/6
AUTOMATIC POWER FACTOR
CONTROLLER

TAS Powertek Pvt. Ltd.
Corporate Office:
W-61, MIDC, Ambad, Nasik - 422010, Maharashtra (India)
Tel: +91-(253)-2384038 / 2381090
Email: [email protected]

NOTE
These instructions do not purport to cover all details or
variations in equipment, nor to provide for every possible
contingency to be met in connection with installation,
operation or maintenance.

Should further information be desired or should particular
problems arise which are not covered sufficiently for the
purchasers purposes, the matter should be referred to our
TAS Powertek Pvt. Ltd., office.
The contents of this instruction Manual shall not become
part of or modify any prior or existing agreement or
relationship. The sales contract contains the entire
obligations of TAS Powertek Pvt. Ltd. The warranty
contained in the contract between the parties is the sole
warranty of TAS Powertek Pvt. Ltd. Any statements
contained herein do not create new warranties or modify the
existing warranty.

The reproduction, transmission or use of this
document or its contents is not permitted
without express written authority. Offenders
will be liable for damages. All rights are
reserved.

Index
Index Page
-----------------Features & Specifications
----------Mechanical Dimensions/ mounting --------Functional Block diagram
-----------------PF correction technique
-----------------Back Side terminals
-----------------------Typical wiring scheme ---------------------Front Facia
---------------------------------Communication connector connections ----Display of various parameters / Status ---Method of Keyboard/Display usage -------Parameter Submenu -----------------------Commissioning Instruction (before Powerup)
Fault finding Guidelines ---------------------

-1-

1
2
3
4
5
6
7
8
9
10
19
22
24
25

Features:
• Totally Micro-processor controlled Digital Signal processing
logic for measurements.
• All measurements with 1.0 class accuracy.
• Automatic Synchronisation capable of giving the correct
results for wrong connections at CT terminals (even wrong
polarity of CTs).
• Measurement and kVAr compensation are frequency / THD
compensated.
• Load V,Iph, In and Cap. current THD measurement.
• Up-to 6 output banks control.
• Capable of doing the kVAr measurements on basis of mean
of the correction cycle time and provide kVAr compensation.
• Standard 144 X 144 cabinet for panel door flush mounting.
• Serial communication through standard TAS protocols.
• Manual testing mode for user checking of the Capacitor steps
switching.
• Protections provided (user settable):
Over/under Voltage
Cap. Over/under current / THD.
Over/Under frequency (internally set limits)
Over / Under load.
Load unbalance.
Capacitor individual step kVAr monitoring.
Out of steps: Under-compensation (only for indication)
NV-RAM battery down.
• Data logging for various parameters for 2months period at an
interval of 1hr.
• Unit comes along with PC (Windows compatible) software
for downloading and viewing the logged data.

Specifications:
•
•
•
•
•
•
•
•
•
•
•
•

Feed-back Voltage:440Volt (+10%/-30%)
Current input : 1Amp for load and capacitor feed-back.
Measurement Accuracy: Class 1.0
Auxiliary Supply: 525Vac to 300Vac.
Correction / Discharge time:
Selectable in seconds from 10sec. to 240sec.
Output commands:
NO contacts each with current rating of 0.5Amp AC. at
240Vac.
RS-232 baud rate selectable from 4.8kBPS to 38.4kBPS.
Operating temperature: 0 to 55oC.
1.0class measurement Operating temperature: 0 to 50oC.
Storage temperature: -10 to +75oC.
Humidity: 0 to 98%.
Supply frequency: 45Hz to 55Hz.

-2-

Mechanical Dimensions:
135

144

135

120
144

6

Recommended size for cutout on panel door is 138 X 138.
All Dimensions given are in mm.

Maximum weight: (with clamps and terminals) = 2.5kg.

-3-

Functional Block Diagram:
3 channel
Current f.b.

3
Channel
Cap.
Current
f.b.

3 channel
Voltage f.b.

SPF-25

V, I, PF and Power
Measurement
Block
For every AC mains
Cycle.

Calculation
Block for
• Energy Parameters
• Harmonic analysis

EEPROM
For Data
Logging

Keyboard,
Display and
Other support
Functions
Block.

RS-232 Serial
Communication.
TAS-01
Protocol stack.

Power Factor
Correction Block
+ event monitoring.

Outputs Commands
For Capacitor
Switching.

Power Supply
Block.

Above block diagram gives the functional blocks that are built into SPF-25 PF
correction relay.
These blocks are made up with the combination of functions from hardware and
corresponding firmware that resides in the Program memory of the micro-processor
used therein.
Even though the basic blocks exists as shown in the diagram, there functionality is
interdependent. The entire combination is carefully designed so as to have
minimum effects of Electrical and Electromagnetic noise level on the functionality of
this SPF-25.
The firmware written takes into various error handling eventualities so that the
functioning of this PF relay is error free and highly reliable.

-4-

PF correction technique:
KVAr Inductive

Target
PF.
Cos Φ
= PF

1.5 X kVAr
Of Smallest
Capacitor bank

KW

No change band.
KVAr Capacitive
Capacitor Addition band.
Capacitor Removal band.
SPF-25 for kVAr compensation works with the kW v/s kVAr diagram as shown here
above.
A band is created across the target PF value. (Target PF is set by user). This band
is of +0.75 of the smallest capacitor bank kVAr. Thus, total band width is always 1.5
times the smallest capacitor bank kVAr used. This is a no change band. If the
mains source parameters are within this band, SPF-25 would not change the
capacitors bank status.
If the mains parameters are out of this “No change band”, then SPF-25 calculates
the correct capacitor bank combination to be added / subtracted and within one
correction cycle brings it within the No change band.
The no change band width is selected as mentioned because it has to prevent unnecessary hunting (switching on/off) of the capacitor banks.

-5-

Back Side terminals:

Voltage
Feed-Back

Auxiliary
Supply

Current
Feed-Back
Output commands.

-6-

Capacitor
Current
Feed-Back

Typical Wiring with SPF-25 PF correction system.
L
O
A
D

L
C
R
+

L
C
R
-

L
C
Y
+

L
C
Y
-

L
C
B
+

L
C
B
-

PH 3
PH 2
PH 1
CCR+
CCRCCY+
CCYCCB+
CCB-

S
P
F
2
5

Auxiliary
Supply

L1
L2

Com
C01
C02
|

C06

Mains Connections:
Phase 1 control:
Neutral control:
Commands:
Load Current CT:
Capacitor Current CT:

-7-

Front Facia of SPF-25:
LCD Display

Step status LED indication
Serial Communication Port

Membrane Keypad

Usage of the UP and DN key makes the LCD display to scroll up
and down. This is used for display of various status as well as for
viewing the On line measured electrical values.
These keys are also used for changing values in Parameters
Editing mode and used for status changing of banks in Manual
mode.
Usage of ENT key is for entering the submenu and / or for setting
up some values.
The L and R keys are used in changing the position of the cursor
from Left to Right and vice-versa.

-8-

RS-232 serial communication 9 pin D connector:

5

4

6

3

7

2

8

1

9
RXD

GND

TXD

RS-232 cable connection Details:

PIN
NO

PC side
Connection

CONNECTION

SPF-25

1

NC

2

RXD

TXD

3

TXD

RXD

GND

GND

4
5
6
7
8
9

NC

-9-

Display of Various Parameters / Status:
PAGE: 00

COSΦ= -0.99 A OK

This is default display screen giving
information on PF, mode and
working status.

COSΦ= -0.99 :This part of the display indicates the Power Factor running value. The
sign –ve indicates that PF is Capacitive and no sign (+ve) indicates that PF is Inductive.
The PF indicated is the overall PF of the three phase system.
A or M :
This part either indicates the letter “A” or letter “M”. The letter A means
that SPF-25 is working in Auto mode.
The letter M means that SPF-25 is presently in Manual mode.
The Auto or Manual modes can be selected by pressing ENT key on this page.
(If Password option is enabled, enter the same by using UP/DN/L/R keys and then
Pressing ENT)
Then by UP or DN key you can stroll between the displays:
“1. Edit Mode”, “2. Auto Mode”, “3.Manual Mode”.
The first one “1.Edit Mode” is for parameter changing. The details of parameter changing
are explained in detail in later part of this manual.
The second and third one as display indicates are for selecting Auto or Manual mode
respectively. The ENT key pressed on selecting the mode desired, puts the SPF-25 into
that mode.
Auto Mode: In this mode SPF-25 works in automatic mode. It switches the capacitor
banks automatically depending on the parameter setting of target PF. This mode is the
default mode and is to be used for unmanned operation of the system controlled by
SPF-25.
Manual Mode: This mode is activated for checking/testing the capacitor banks switching.
Its also used for changing the Masking status of the capacitor banks. More on this is
explained later. (On Page 01 explanation)
OK or ** :
The last part of the display that is blinking every 500mS indicates the
working status of SPF-25. “OK” indicates that unit is working fine without any trip
conditions. If there is other indication, the meaning of the same can be as:
OK
:
No Fault
OC
:
Over Capacitor Current
UC
:
Under Capacitor Current
OL
:
Over Load
UL
:
Under Load
OV
:
Over Voltage
UV
:
Under Voltage
OF
:
Over Frequency
UF
:
Under Frequency
OH
:
Over Capacitor Current THD %.
OB
:
Out of Banks
LU
:
Load Unbalance
BF
:
Battery Failure (RTC)
NV
:
NVRAM Checksum Error
VA
:
Voltage Absent
- 10 -

PAGE: 01

PAGE: 01

______

AUTO

______

MAN

This display indicates the Bank status in Auto mode and in Manual mode it helps
to make the specific bank On or Off or declare masked.
: Means Bank is On.
: Means Bank is Off.
: Means Bank is Off and is declared masked (out of action)
: Means Bank does not exist for compensation.
When the Page 01 is in Auto mode, its only for indication of Bank status.
But in Manual mode, the “ENT” key press activates the manual control
mode. The cursor over the bank number starts blinking. The UP and DN
keys can turn On and Off the respective bank.
The DN key pressed puts the respective bank in Masking mode and another
press of DN key brings it out of Masking mode.

Putting the bank masking status permanently:
If a bank is to be permanently put in masked mode or is to be brought out of
permanent masked mode, it can be done by bringing the blinking cursor on
the position of the respective bank by use of L or R key. Then by pressing
DN key, bring the status of the bank to the required level (Masked or
Unmasked). Then press ENT key so that cursor stops blinking. After that by
pressing UP key go to Page 00. Then Press ENT. (If Password option is
enabled, enter the same by using UP/DN/L/R keys and then Press ENT)
“1.EDIT MODE” would be displayed. Press ENT one more time. “1.General
and IO” would be displayed. Press ENT again. “Pwd : Disable” or “Pwd :
Enable” would be displayed. Press UP key. “Exit: No Save” would be
displayed. Press ENT so that cursor will start blinking. Press UP. “Exit: With
Save” would be displayed with cursor blinking. Press ENT. “Saving in
EEPROM” would be displayed for a short time and then Page 00 would be
displayed.
You will observe that the bank status as requirement is changed
permanently to the status desired.

- 11 -

PAGE: 02

1.Overall Values
PRESS
PAGE: 02.1

Avg Vol: 415.7 V
PAGE: 02.2

Avg Cur: 0123.4A
PAGE: 02.3

Tot KW:

0081.2

PAGE: 02.4

TotKVAR: 0024.6
PAGE: 02.5

Tot KVA: 0101.1
PAGE: 02.6

Avg CC:

0031.3A

PAGE: 02.7

CKVAR:

028.35

PAGE: 02.8

LS PF:

0.82

PAGE: 02.9

LS KVAR: 0043.9
PAGE: 02.10

LS KVA:

0125.7

PAGE: 02.11

Freq:

49.9Hz

The Overall values Display menu has submenus as displayed above. As its
self explanatory it means:
Avg Vol: Average voltage of all the three line to line voltage values.
Avg Cur: Average current of all the three phase line current values.
Tot KW: Overall kW of the three phase system measured at source.
TotKVAR: Overall kVAr of the three phase system measured at source.
Tot KVA: Overall kVA of the three phase system measured at source.
Avg CC: Average of three phase current through capacitor panel.
CKVAR: Capacitive kVAr that is compensated by the system.
LS PF: Load side PF. (PF value if not compensated.
LS KVAR: Load side kVAr.
LS KVA: Load side kVA.
Freq: Supply frequency in Hz.
- 12 -

PAGE: 03

2.Per-Phase RMS

PRESS
PAGE: 03.1

R-Y Vol: 415.7 V
PAGE: 03.2

Y-B Vol: 415.7 V
PAGE: 03.3

B-R Vol: 415.7 V
PAGE: 03.4

Rph Cur: 0110.8A
PAGE: 03.5

Yph Cur: 0110.8A
PAGE: 03.6

Bph Cur: 0110.8A
PAGE: 03.7

Neutral: 0010.2A
PAGE: 03.8

Rph Cap: 0022.5A
PAGE: 03.9

Yph Cap: 0022.5A
PAGE: 03.10

Bph Cap: 0022.5A

Per Phase RMS: Submenu:
R-Y Vol: Measured AC Voltage RMS value across R and Y phase.
Y-B Vol: Measured AC Voltage RMS value across Y and B phase.
B-R Vol: Measured AC Voltage RMS value across B and R phase.
Rph Cur: Line current RMS value in R phase. Mains source.
Yph Cur: Line current RMS value in Y phase. Mains source.
Bph Cur: Line current RMS value in B phase. Mains source.
Neutral: Neutral current RMS value.
Rph Cap: Capacitor current RMS value in R phase.
Yph Cap: Capacitor current RMS value in Y phase.
Bph Cap: Capacitor current RMS value in B phase.

- 13 -

PAGE: 04

3.Power
PRESS
PAGE: 04.1

Rph PF:

PAGE: 04.10

1.00

Rph KVA: 0109.7

PAGE: 04.2

Yph PF:

PAGE: 04.11

1.00

Yph KVA: 0109.7

PAGE: 04.3

Bph PF:

PAGE: 04.12

1.00

Bph KVA: 0109.7

PAGE: 04.4

Rph KW:

PAGE: 04.13

0100.2

RphCKVAR: 010.76

PAGE: 04.5

Yph KW:

PAGE: 04.14

0100.2

YphCKVAR: 010.76

PAGE: 04.6

Bph KW:

PAGE: 04.15

0100.2

BphCKVAR: 010.76

PAGE: 04.7

PAGE: 04.16

RphKVAR: 0020.4

Rph mF

PAGE: 04.8

: 165.06

PAGE: 04.17

YphKVAR: 0020.4

Yph mF

PAGE: 04.9

: 165.06

PAGE: 04.18

BphKVAR: 0020.4

Bph mF

: 165.06

Power: Submenu:
Rph PF: Power Factor of R phase on mains source.
Yph PF: Power Factor of Y phase on mains source.
Bph PF: Power Factor of B phase on mains source.
Rph kW: Active Power in kW in R-phase.
Yph kW: Active Power in kW in Y-phase.
Bph kW: Active Power in kW in B-phase.
RphkVAR: Reactive Power in kVAr in R-phase.
YphkVAR: Reactive Power in kVAr in Y-phase.
BphkVAR: Reactive Power in kVAr in B-phase.
Rph KVA: Apparent Power in kVA in R-phase.
Yph KVA: Apparent Power in kVA in Y-phase.
Bph KVA: Apparent Power in kVA in B-phase.
RphCKVAR: Capacitor injected reactive power in R-phase.
YphCKVAR: Capacitor injected reactive power in Y-phase.
BphCKVAR: Capacitor injected reactive power in B-phase.
Rph mF: Capacitor value in micro-farad in R-phase.
Yph mF: Capacitor value in micro-farad in Y-phase.
Bph mF: Capacitor value in micro-farad in B-phase.
- 14 -

PAGE: 05

4.Energy
PRESS
PAGE: 05.1

KWH:

1234567.8

PAGE: 05.2

IndKVARH:12345.6
PAGE: 05.3

CapKVARH:12345.6
PAGE: 05.4

KVAH:

1234567.8

PAGE: 05.5

CKVARH:1234567.8

Energy: Submenu:
KWH: Overall cumulative active energy in kWh on Mains supply.
IndKVARH: Inductive reactive energy in kVArh on Mains supply.
CapKVARH: Capacitive reactive energy in kVArh on Mains supply.
KVAH: Overall cumulative apparent energy in kVA on Mains supply.
CKVARH: Capacitor compensated reactive energy in kVArh.

- 15 -

PAGE: 06

5.Harmonics
PRESS
PAGE: 06.1

Vr-THD-F: 002.4%
PAGE: 06.2

Vy-THD-F: 002.4%
PAGE: 06.3

Vb-THD-F: 002.4%
PAGE: 06.4

Ir-THD-F: 012.5%
PAGE: 06.5

Iy-THD-F: 012.5%
PAGE: 06.6

Ib-THD-F: 012.5%
PAGE: 06.7

In-THD-F: 005.0%
PAGE: 06.8

CCr-THD-F:028.2%
PAGE: 06.9

CCy-THD-F:028.2%
PAGE: 06.10

CCb-THD-F:028.2%

Harmonics: Submenu:
Vr-THD-F/R: R-Y line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Vy-THD-F/R: Y-B line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Vb-THD-F/R: B-R line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Ir-THD-F/R: R phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Iy-THD-F/R: Y phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Ib-THD-F/R: B phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
In-THD-F/R: Neutral current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
CCr-THD-F/R: R phase Capacitor current % Total Harmonic Distortion.
CCy-THD-F/R: Y phase Capacitor current % Total Harmonic Distortion.
CCb-THD-F/R: B phase Capacitor current % Total Harmonic Distortion.

- 16 -

PAGE: 07

6.Step KVAR
PRESS
PAGE: 07.1

Stp1 KVAR:0009.0
PAGE: 07.2

Stp2 KVAR:0009.0
PAGE: 07.3

Stp3 KVAR:0009.0
PAGE: 07.4

Stp4 KVAR:0009.0
PAGE: 07.5

Stp5 KVAR:0009.0
PAGE: 07.6

Stp6 KVAR:0009.0

Step KVAR: Submenu:
Stp1 KVAR: Step 1 kVAr value normalized at Capacitor rated voltage.
Stp2 KVAR: Step 2 kVAr value normalized at Capacitor rated voltage.
Stp3 KVAR: Step 3 kVAr value normalized at Capacitor rated voltage.
Stp4 KVAR: Step 4 kVAr value normalized at Capacitor rated voltage.
Stp5 KVAR: Step 5 kVAr value normalized at Capacitor rated voltage.
Stp6 KVAR: Step 6 kVAr value normalized at Capacitor rated voltage.

- 17 -

PAGE: 08

Time: 10:10:00
Real Time Clock: RTC time set in the SPF-25 is displayed here. Its in
HH:MM:SS format.

PAGE: 09

Date: 07:11:06
Real Time Clock: RTC date set in the SPF-25 is displayed here. Its in
dd:mm:yy format.

PAGE: 10

SPF-25 1.0.6

SPF-25 internal firmware version number is displayed here. (Just for user
information)

Total number of Main display pages are 11nos ranging from “00” to
“10”.

- 18 -

Method for Keyboard/Display usage.

Flow chart for entering into different modes:

PRESS
Enable

Default
Display
mode

If Password
Option is
Enable/Disable.

Disable

Enter Pwd: ****
PRESS
Enter the 4
Digit password
By use of
L, R, UP & DN
Keys.

PRESS

NO

IF
PASSWORD
Correct?

*

YES
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

1.Edit Mode

2.Auto Mode

3.Manual Mode

- 19 -

Parameter Editing Submenu Level 1:

*
1.General
2.System
3.Fault
4.Step
5.Communication

Sub-menu
Level 1
for
Parameter
Editing.

Parameter Editing
Sub-Menu
LEVEL 2

1.General and IO: Parameters related with general function and Input/Output
2. System: Electrical system (Mains supply) related parameters.

3. Fault: Setting Faults and fault levels.
4. Step: Capacitor Steps related parameters.
5. Communication: Parameters related with communication and data logging.

- 20 -

Parameter Editing Method:
(For Submenu Level 2 : L2)

Sub-Menu Level 1.
Cursor Blinking
at Parameter Values.

1.Submenu L2: ****

1.Submenu L2: ****
PRESS

key to increment value.

PRESS

Key to decrement value.

PRESS

Key to shift cursor Left.

PRESS

Key to shift cursor Right.
2.Submenu L2: ****

2.Submenu L2: ****
PRESS

key to increment value.

PRESS

Key to decrement value.

PRESS

Key to shift cursor Left.

PRESS

Key to shift cursor Right.

3.Submenu L2: ****

Exit: No Save

Exit: No Save

Without saving

Default
Display.

With saving

Screen for 1second

Saving In EEProm

Exit: With Save

- 21 -

Parameter Editing Submenu Level 2:
Menu
General

Parameter
Pwd
Ch-Pwd
Ld Def
THD
Rst. Energy

Meaning of Parameter
Password Control
Password value
Load all factory default parameters.
Type of THD factor to be displayed
Energy Counters reset to zero option

Default
Enable
1111
No
F-THD
No

Menu
System

Parameter
Meas. Vol.
Ld. Cur. Pr.
Cap. Cur. Pr.
PF Target
PF Target
Auto Sync
Async Tol.
Reset Async

Meaning of Parameter
Default
SPF-25 rated measurement voltage
440
Primary current value of mains CT
0180
0075
Primary current value of capacitor CT
Target PF for deciding Lag or Lead
Lag
1.00
Target PF exact value
Automatic synchronisation requirement Yes
% load variation tolerence for Auto-sync. 30
No
Reset Auto-sync to default value.

Menu
Fault

Parameter
Over Vol.
Over Vol. Lim
Over Vol. Clr
Under Vol.
Under Vol. Lim
Under Vol. Clr
Over Load
Over Ld. Lim
Over Ld. Clr
Under Ld.
Under Ld. Lim
Under Ld. Clr
Ld. Unbalance
Ld. Unb. Lim
Over CC
Over CC. Lim
Over CC. Clr
Over CC. Rst.
Over CC. Rst.
Under CC.
Under CC. Lim
Under CC. CLr
CC THD
CC THD Lim
CC THD Clr
Step Check
Cap. Cur Tol
Under Comp.
RTC Bat

Meaning of Parameter
Default
Over Voltage Fault: action by PDE-30 Off Step
Over Voltage activation limit value
1.10
Over Voltage resumption limit value 1.05
Under Voltage Fault: Action?
Off Step
Under Voltage activation limit value 0.70
Under Voltage resumption limit value 0.75
Over Load Fault: Action?
Indicate
Mains current over load limit value
1.30
Mains cur. over load resume value
1.25
Under Load on Mains: Action?
Indicate
Under load Activation limit value
0.03
Under load Resumption limit value
0.05
Load Un-balance Fault: Action?
Off Step
Load Un-balance limit
025%
Capacitor Over Current Fault: Action? Disable
Cap. Over Current Limit value.
1.30
Cap. Over Current Resume value.
1.25
Auto reset feature on Cap. Over Cur. No
If Over CC. Rst.=Yes. Time for reset. 120 sec
Under Capacitor current fault: Action? Disable
Under Cap. Cur. Limit value.
0.95
Under Cap. Cur. Resume value.
0.97
Capacitor current Over THD: Action? Disable
Cap.Cur. Over THD limit value.
0.10
Cap.Cur. Over THD resume value.
0.08
Every step kVAr healthiness monitor. Disable
Step kVAr healthiness: tolerence.
0.10
Out of Banks Indication.
Disable
RTC Battery fault monitoring.
Enable

- 22 -

Min
Disable
0000
No
R-THD
No
Min
Non
0001
0001
Lead
0.70Lag
No
01
No

Min

Max
Enable
9999
Yes
F-THD
Yes
Max
Edible
9999
9999
Lag
0.85Lead
Yes
50
Yes

Max

Disable, Indicative, Off Step

0.90
0.85

1.20
1.15

Disable, Indicative, Off Step

0.70
0.75

0.95
1.00

Disable, Indicative, Off Step

1.10
1.05

1.30
1.25

Disable, Indicative, Off Step

0.01
0.02

0.20
0.25

Disable, Indicative, Off Step

005%

100%

Disable, Indicative, Off Step

1.05
1.00
No
15

1.50
1.45
Yes
900

Disable, Indicative, Off Step

0.75
0.80

0.98
1.00

Disable, Indicative, Off Step

0.02
0.01
Disable
0.03
Disable
Disable

0.99
0.90
Enable
0.50
Enable
Enable

Menu
Step

Parameter
No. of Steps
Step Vol
Corr. Time
Discharge Time
Step 1 KVAR
Step 2 KVAR
Step 3 KVAR
Step 4 KVAR
Step 5 KVAR
Step 6 KVAR

Meaning of Parameter
Number of Capacitor steps utilised
Voltage at which kVAr is defined
Correction cycle time.
Capacitor discharge time.
Step 1 kVAr value.
Step 2 kVAr value.
Step 3 kVAr value.
Step 4 kVAr value.
Step 5 kVAr value.
Step 6 kVAr value.

Menu
Parameter
Meaning of Parameter
Communication Unit ID
Communication ID of the unit
Baud Rate
Serial communication baud rate.
Time
RTC time to be set
Date
RTC date to be set
Init RTC
Initialise RTC?
Clear NVRAM Clear all contents on NV RAM?

Default
3
440
120 secs
120 secs
006
009
018
018
018
018

Min
1
380
010
010
001
001
001
001
001
001

Default
3001
09600
--No
No

Min
0000
04800
--No
No

Max
6
660
240
240
250
250
250
250
250
250

Max
9999
38400
--Yes
Yes

Note that all the parameters in the Sub-Menu Level 2 should be carefully filled in the
SPF-25. Failing to put the correct parameters can make SPF-25 to malfunction.
Its therefore advised that a trained person should only be allowed to change these
values.

- 23 -

Commissioning Instructions :
before panel is powered up for the first time.
1. Panel Wiring Check
Ensure that all connections in the panel is tightened properly and there are no
loose connections. Also ensure that the wiring is done as per the wiring
diagram.
2. Power Wiring Check
Ensure that the power cables are connected properly from the Panel I/C to the
feeder I/C or the transformer bushings. The connection has to be after the
Load Feed back CT looking from the Transformer side.
Ensure that the Bus Bars and/or Lugs are clean and free of Dust, Corrosion or
Oxidation on the contact sides so that good electrical connection is maintained.
The surface area should be flat so as to get maximum contact area.
If required Clean the Bus Bars and/ or Lugs by rubbing it with Polish Paper to
remove the oxidation layer. Provide contact paste in between the contacts
surfaces.
Not performing this, can result in to a weaker source point for Capacitor
charging during Step on and this can generate undesirable Noise which can
hamper the performance of equipments installed in the capacitor panel.
3. Load Feed Back CT connection.
Ensure that the load feed back CT connections are done properly. Confirm that
correct phase CT is connected with the correct phase input terminals. (Even
though auto sync is capable of taking care of wrong CT polarities or CT
position interchanging, but then on display, the Phase readings may be seen to
be interchanged. (May be R-phase reading would be seen in B-phase and
vice-versa.
CT connections to be done carefully so as to ensure that the wire does not get
open and there is no loose connection.

Loose connection’s or open CT secondary can result in to very high voltages
getting developed in the circuit which can damage the CT and also produce
high levels of noise in the system.

- 24 -

Fault Finding Guidelines :

Fault Type

Probable Reason

Action to Take

Unit Does not
turn ON. No
display on LCD.

•Input auxiliary supply
not coming.
•Input side fuses
blown

•Check the input
supply to restore
•Check fuses in the
unit for OK.

Unit does not
turn On any
capacitors even
if PF is below
Lower PF limit.

•If auto-sync failure
message is there at
Power On.

• Load may be highly
fluctuating so need of
manual
synchronisation only.
• This is OK
condition.

• The load KW is too
low with Under load
fault enable condition.
•Control connections
from SPF-25 to
contactor coils are not
proper

•Check control supply
and connections from
SPF-25 to contactors.

BF indication on
Default display.

• Internal Ni-Cd
3.2Vdc battery used
for RTC and NV RAM
must be drained down.

• Replace this battery
in consultancy with
TAS trained
personnel.

Some Capacitor
banks are
declared as
faulty even if
they are
checked to be
OK.

•Individual step health
monitoring is enabled
and tolerance limits
set are too stringent.
• Capacitor current
THD factor is
continuously
fluctuating.

•Set the tolerance
limits for individual
steps monitoring as
relaxed.
• With continuously
fluctuating THD of
Capacitor current and
higher level of THD
can cause some
errors in individual
step KVAR
measurement. Under
this condition, best is
to keep this feature
disabled.

- 25 -

Fault Finding Guidelines (continued):

Fault Type

Probable Reason

Action to Take

Serial
Communication
is not working.

• Baud rate selection
is not proper.
• Unit ID is not set
properly.
• Serial
communication cable
connections are not
proper.

• Select proper baud
rate.
• Set the unit ID
correctly.
• Check the serial
cable continuity as
per the connections
given earlier in this
manual.

Data logging is
not taking place.

• Possible that RTC
date is not set
properly.

• Change the battery
by help of TAS’s
authorised person.

SPF-25 resets
occasionally on
turning OFF of
any contactor.

• The contactor supply
phase may be the
same as used for SPF25 auxiliary supply.
• RC snubbers/ free
wheeling diodes are
not put with contactor
coils.

• Use the different
phase for control
supply of contactors
and for SPF-25 supply
• Usage of RC
snubbers / free
wheeling diodes is
mandatory.

- 26 -

Corporate Office/Works/Design Centre:
W-61, MIDC, Ambad, Nasik - 422010, Maharashtra (India)
Tel: +91-(253)-2384038 / 2381090
Email: [email protected]
Marketing and After-Sales Service:
A/58, Kamal Pushpa, K.C. Road, Bandra, Mumbai-400050.
Tel: +91-9930513923
Email: [email protected]
Regional Office: Delhi
191-B, Ground Floor, Padam Nagar (Filter Market),
New Delhi - 110007 (India).
Tel: +91-9911615701
Email: [email protected]


Slide 10

Operations Manual
SPF-25/6
AUTOMATIC POWER FACTOR
CONTROLLER

TAS Powertek Pvt. Ltd.
Corporate Office:
W-61, MIDC, Ambad, Nasik - 422010, Maharashtra (India)
Tel: +91-(253)-2384038 / 2381090
Email: [email protected]

NOTE
These instructions do not purport to cover all details or
variations in equipment, nor to provide for every possible
contingency to be met in connection with installation,
operation or maintenance.

Should further information be desired or should particular
problems arise which are not covered sufficiently for the
purchasers purposes, the matter should be referred to our
TAS Powertek Pvt. Ltd., office.
The contents of this instruction Manual shall not become
part of or modify any prior or existing agreement or
relationship. The sales contract contains the entire
obligations of TAS Powertek Pvt. Ltd. The warranty
contained in the contract between the parties is the sole
warranty of TAS Powertek Pvt. Ltd. Any statements
contained herein do not create new warranties or modify the
existing warranty.

The reproduction, transmission or use of this
document or its contents is not permitted
without express written authority. Offenders
will be liable for damages. All rights are
reserved.

Index
Index Page
-----------------Features & Specifications
----------Mechanical Dimensions/ mounting --------Functional Block diagram
-----------------PF correction technique
-----------------Back Side terminals
-----------------------Typical wiring scheme ---------------------Front Facia
---------------------------------Communication connector connections ----Display of various parameters / Status ---Method of Keyboard/Display usage -------Parameter Submenu -----------------------Commissioning Instruction (before Powerup)
Fault finding Guidelines ---------------------

-1-

1
2
3
4
5
6
7
8
9
10
19
22
24
25

Features:
• Totally Micro-processor controlled Digital Signal processing
logic for measurements.
• All measurements with 1.0 class accuracy.
• Automatic Synchronisation capable of giving the correct
results for wrong connections at CT terminals (even wrong
polarity of CTs).
• Measurement and kVAr compensation are frequency / THD
compensated.
• Load V,Iph, In and Cap. current THD measurement.
• Up-to 6 output banks control.
• Capable of doing the kVAr measurements on basis of mean
of the correction cycle time and provide kVAr compensation.
• Standard 144 X 144 cabinet for panel door flush mounting.
• Serial communication through standard TAS protocols.
• Manual testing mode for user checking of the Capacitor steps
switching.
• Protections provided (user settable):
Over/under Voltage
Cap. Over/under current / THD.
Over/Under frequency (internally set limits)
Over / Under load.
Load unbalance.
Capacitor individual step kVAr monitoring.
Out of steps: Under-compensation (only for indication)
NV-RAM battery down.
• Data logging for various parameters for 2months period at an
interval of 1hr.
• Unit comes along with PC (Windows compatible) software
for downloading and viewing the logged data.

Specifications:
•
•
•
•
•
•
•
•
•
•
•
•

Feed-back Voltage:440Volt (+10%/-30%)
Current input : 1Amp for load and capacitor feed-back.
Measurement Accuracy: Class 1.0
Auxiliary Supply: 525Vac to 300Vac.
Correction / Discharge time:
Selectable in seconds from 10sec. to 240sec.
Output commands:
NO contacts each with current rating of 0.5Amp AC. at
240Vac.
RS-232 baud rate selectable from 4.8kBPS to 38.4kBPS.
Operating temperature: 0 to 55oC.
1.0class measurement Operating temperature: 0 to 50oC.
Storage temperature: -10 to +75oC.
Humidity: 0 to 98%.
Supply frequency: 45Hz to 55Hz.

-2-

Mechanical Dimensions:
135

144

135

120
144

6

Recommended size for cutout on panel door is 138 X 138.
All Dimensions given are in mm.

Maximum weight: (with clamps and terminals) = 2.5kg.

-3-

Functional Block Diagram:
3 channel
Current f.b.

3
Channel
Cap.
Current
f.b.

3 channel
Voltage f.b.

SPF-25

V, I, PF and Power
Measurement
Block
For every AC mains
Cycle.

Calculation
Block for
• Energy Parameters
• Harmonic analysis

EEPROM
For Data
Logging

Keyboard,
Display and
Other support
Functions
Block.

RS-232 Serial
Communication.
TAS-01
Protocol stack.

Power Factor
Correction Block
+ event monitoring.

Outputs Commands
For Capacitor
Switching.

Power Supply
Block.

Above block diagram gives the functional blocks that are built into SPF-25 PF
correction relay.
These blocks are made up with the combination of functions from hardware and
corresponding firmware that resides in the Program memory of the micro-processor
used therein.
Even though the basic blocks exists as shown in the diagram, there functionality is
interdependent. The entire combination is carefully designed so as to have
minimum effects of Electrical and Electromagnetic noise level on the functionality of
this SPF-25.
The firmware written takes into various error handling eventualities so that the
functioning of this PF relay is error free and highly reliable.

-4-

PF correction technique:
KVAr Inductive

Target
PF.
Cos Φ
= PF

1.5 X kVAr
Of Smallest
Capacitor bank

KW

No change band.
KVAr Capacitive
Capacitor Addition band.
Capacitor Removal band.
SPF-25 for kVAr compensation works with the kW v/s kVAr diagram as shown here
above.
A band is created across the target PF value. (Target PF is set by user). This band
is of +0.75 of the smallest capacitor bank kVAr. Thus, total band width is always 1.5
times the smallest capacitor bank kVAr used. This is a no change band. If the
mains source parameters are within this band, SPF-25 would not change the
capacitors bank status.
If the mains parameters are out of this “No change band”, then SPF-25 calculates
the correct capacitor bank combination to be added / subtracted and within one
correction cycle brings it within the No change band.
The no change band width is selected as mentioned because it has to prevent unnecessary hunting (switching on/off) of the capacitor banks.

-5-

Back Side terminals:

Voltage
Feed-Back

Auxiliary
Supply

Current
Feed-Back
Output commands.

-6-

Capacitor
Current
Feed-Back

Typical Wiring with SPF-25 PF correction system.
L
O
A
D

L
C
R
+

L
C
R
-

L
C
Y
+

L
C
Y
-

L
C
B
+

L
C
B
-

PH 3
PH 2
PH 1
CCR+
CCRCCY+
CCYCCB+
CCB-

S
P
F
2
5

Auxiliary
Supply

L1
L2

Com
C01
C02
|

C06

Mains Connections:
Phase 1 control:
Neutral control:
Commands:
Load Current CT:
Capacitor Current CT:

-7-

Front Facia of SPF-25:
LCD Display

Step status LED indication
Serial Communication Port

Membrane Keypad

Usage of the UP and DN key makes the LCD display to scroll up
and down. This is used for display of various status as well as for
viewing the On line measured electrical values.
These keys are also used for changing values in Parameters
Editing mode and used for status changing of banks in Manual
mode.
Usage of ENT key is for entering the submenu and / or for setting
up some values.
The L and R keys are used in changing the position of the cursor
from Left to Right and vice-versa.

-8-

RS-232 serial communication 9 pin D connector:

5

4

6

3

7

2

8

1

9
RXD

GND

TXD

RS-232 cable connection Details:

PIN
NO

PC side
Connection

CONNECTION

SPF-25

1

NC

2

RXD

TXD

3

TXD

RXD

GND

GND

4
5
6
7
8
9

NC

-9-

Display of Various Parameters / Status:
PAGE: 00

COSΦ= -0.99 A OK

This is default display screen giving
information on PF, mode and
working status.

COSΦ= -0.99 :This part of the display indicates the Power Factor running value. The
sign –ve indicates that PF is Capacitive and no sign (+ve) indicates that PF is Inductive.
The PF indicated is the overall PF of the three phase system.
A or M :
This part either indicates the letter “A” or letter “M”. The letter A means
that SPF-25 is working in Auto mode.
The letter M means that SPF-25 is presently in Manual mode.
The Auto or Manual modes can be selected by pressing ENT key on this page.
(If Password option is enabled, enter the same by using UP/DN/L/R keys and then
Pressing ENT)
Then by UP or DN key you can stroll between the displays:
“1. Edit Mode”, “2. Auto Mode”, “3.Manual Mode”.
The first one “1.Edit Mode” is for parameter changing. The details of parameter changing
are explained in detail in later part of this manual.
The second and third one as display indicates are for selecting Auto or Manual mode
respectively. The ENT key pressed on selecting the mode desired, puts the SPF-25 into
that mode.
Auto Mode: In this mode SPF-25 works in automatic mode. It switches the capacitor
banks automatically depending on the parameter setting of target PF. This mode is the
default mode and is to be used for unmanned operation of the system controlled by
SPF-25.
Manual Mode: This mode is activated for checking/testing the capacitor banks switching.
Its also used for changing the Masking status of the capacitor banks. More on this is
explained later. (On Page 01 explanation)
OK or ** :
The last part of the display that is blinking every 500mS indicates the
working status of SPF-25. “OK” indicates that unit is working fine without any trip
conditions. If there is other indication, the meaning of the same can be as:
OK
:
No Fault
OC
:
Over Capacitor Current
UC
:
Under Capacitor Current
OL
:
Over Load
UL
:
Under Load
OV
:
Over Voltage
UV
:
Under Voltage
OF
:
Over Frequency
UF
:
Under Frequency
OH
:
Over Capacitor Current THD %.
OB
:
Out of Banks
LU
:
Load Unbalance
BF
:
Battery Failure (RTC)
NV
:
NVRAM Checksum Error
VA
:
Voltage Absent
- 10 -

PAGE: 01

PAGE: 01

______

AUTO

______

MAN

This display indicates the Bank status in Auto mode and in Manual mode it helps
to make the specific bank On or Off or declare masked.
: Means Bank is On.
: Means Bank is Off.
: Means Bank is Off and is declared masked (out of action)
: Means Bank does not exist for compensation.
When the Page 01 is in Auto mode, its only for indication of Bank status.
But in Manual mode, the “ENT” key press activates the manual control
mode. The cursor over the bank number starts blinking. The UP and DN
keys can turn On and Off the respective bank.
The DN key pressed puts the respective bank in Masking mode and another
press of DN key brings it out of Masking mode.

Putting the bank masking status permanently:
If a bank is to be permanently put in masked mode or is to be brought out of
permanent masked mode, it can be done by bringing the blinking cursor on
the position of the respective bank by use of L or R key. Then by pressing
DN key, bring the status of the bank to the required level (Masked or
Unmasked). Then press ENT key so that cursor stops blinking. After that by
pressing UP key go to Page 00. Then Press ENT. (If Password option is
enabled, enter the same by using UP/DN/L/R keys and then Press ENT)
“1.EDIT MODE” would be displayed. Press ENT one more time. “1.General
and IO” would be displayed. Press ENT again. “Pwd : Disable” or “Pwd :
Enable” would be displayed. Press UP key. “Exit: No Save” would be
displayed. Press ENT so that cursor will start blinking. Press UP. “Exit: With
Save” would be displayed with cursor blinking. Press ENT. “Saving in
EEPROM” would be displayed for a short time and then Page 00 would be
displayed.
You will observe that the bank status as requirement is changed
permanently to the status desired.

- 11 -

PAGE: 02

1.Overall Values
PRESS
PAGE: 02.1

Avg Vol: 415.7 V
PAGE: 02.2

Avg Cur: 0123.4A
PAGE: 02.3

Tot KW:

0081.2

PAGE: 02.4

TotKVAR: 0024.6
PAGE: 02.5

Tot KVA: 0101.1
PAGE: 02.6

Avg CC:

0031.3A

PAGE: 02.7

CKVAR:

028.35

PAGE: 02.8

LS PF:

0.82

PAGE: 02.9

LS KVAR: 0043.9
PAGE: 02.10

LS KVA:

0125.7

PAGE: 02.11

Freq:

49.9Hz

The Overall values Display menu has submenus as displayed above. As its
self explanatory it means:
Avg Vol: Average voltage of all the three line to line voltage values.
Avg Cur: Average current of all the three phase line current values.
Tot KW: Overall kW of the three phase system measured at source.
TotKVAR: Overall kVAr of the three phase system measured at source.
Tot KVA: Overall kVA of the three phase system measured at source.
Avg CC: Average of three phase current through capacitor panel.
CKVAR: Capacitive kVAr that is compensated by the system.
LS PF: Load side PF. (PF value if not compensated.
LS KVAR: Load side kVAr.
LS KVA: Load side kVA.
Freq: Supply frequency in Hz.
- 12 -

PAGE: 03

2.Per-Phase RMS

PRESS
PAGE: 03.1

R-Y Vol: 415.7 V
PAGE: 03.2

Y-B Vol: 415.7 V
PAGE: 03.3

B-R Vol: 415.7 V
PAGE: 03.4

Rph Cur: 0110.8A
PAGE: 03.5

Yph Cur: 0110.8A
PAGE: 03.6

Bph Cur: 0110.8A
PAGE: 03.7

Neutral: 0010.2A
PAGE: 03.8

Rph Cap: 0022.5A
PAGE: 03.9

Yph Cap: 0022.5A
PAGE: 03.10

Bph Cap: 0022.5A

Per Phase RMS: Submenu:
R-Y Vol: Measured AC Voltage RMS value across R and Y phase.
Y-B Vol: Measured AC Voltage RMS value across Y and B phase.
B-R Vol: Measured AC Voltage RMS value across B and R phase.
Rph Cur: Line current RMS value in R phase. Mains source.
Yph Cur: Line current RMS value in Y phase. Mains source.
Bph Cur: Line current RMS value in B phase. Mains source.
Neutral: Neutral current RMS value.
Rph Cap: Capacitor current RMS value in R phase.
Yph Cap: Capacitor current RMS value in Y phase.
Bph Cap: Capacitor current RMS value in B phase.

- 13 -

PAGE: 04

3.Power
PRESS
PAGE: 04.1

Rph PF:

PAGE: 04.10

1.00

Rph KVA: 0109.7

PAGE: 04.2

Yph PF:

PAGE: 04.11

1.00

Yph KVA: 0109.7

PAGE: 04.3

Bph PF:

PAGE: 04.12

1.00

Bph KVA: 0109.7

PAGE: 04.4

Rph KW:

PAGE: 04.13

0100.2

RphCKVAR: 010.76

PAGE: 04.5

Yph KW:

PAGE: 04.14

0100.2

YphCKVAR: 010.76

PAGE: 04.6

Bph KW:

PAGE: 04.15

0100.2

BphCKVAR: 010.76

PAGE: 04.7

PAGE: 04.16

RphKVAR: 0020.4

Rph mF

PAGE: 04.8

: 165.06

PAGE: 04.17

YphKVAR: 0020.4

Yph mF

PAGE: 04.9

: 165.06

PAGE: 04.18

BphKVAR: 0020.4

Bph mF

: 165.06

Power: Submenu:
Rph PF: Power Factor of R phase on mains source.
Yph PF: Power Factor of Y phase on mains source.
Bph PF: Power Factor of B phase on mains source.
Rph kW: Active Power in kW in R-phase.
Yph kW: Active Power in kW in Y-phase.
Bph kW: Active Power in kW in B-phase.
RphkVAR: Reactive Power in kVAr in R-phase.
YphkVAR: Reactive Power in kVAr in Y-phase.
BphkVAR: Reactive Power in kVAr in B-phase.
Rph KVA: Apparent Power in kVA in R-phase.
Yph KVA: Apparent Power in kVA in Y-phase.
Bph KVA: Apparent Power in kVA in B-phase.
RphCKVAR: Capacitor injected reactive power in R-phase.
YphCKVAR: Capacitor injected reactive power in Y-phase.
BphCKVAR: Capacitor injected reactive power in B-phase.
Rph mF: Capacitor value in micro-farad in R-phase.
Yph mF: Capacitor value in micro-farad in Y-phase.
Bph mF: Capacitor value in micro-farad in B-phase.
- 14 -

PAGE: 05

4.Energy
PRESS
PAGE: 05.1

KWH:

1234567.8

PAGE: 05.2

IndKVARH:12345.6
PAGE: 05.3

CapKVARH:12345.6
PAGE: 05.4

KVAH:

1234567.8

PAGE: 05.5

CKVARH:1234567.8

Energy: Submenu:
KWH: Overall cumulative active energy in kWh on Mains supply.
IndKVARH: Inductive reactive energy in kVArh on Mains supply.
CapKVARH: Capacitive reactive energy in kVArh on Mains supply.
KVAH: Overall cumulative apparent energy in kVA on Mains supply.
CKVARH: Capacitor compensated reactive energy in kVArh.

- 15 -

PAGE: 06

5.Harmonics
PRESS
PAGE: 06.1

Vr-THD-F: 002.4%
PAGE: 06.2

Vy-THD-F: 002.4%
PAGE: 06.3

Vb-THD-F: 002.4%
PAGE: 06.4

Ir-THD-F: 012.5%
PAGE: 06.5

Iy-THD-F: 012.5%
PAGE: 06.6

Ib-THD-F: 012.5%
PAGE: 06.7

In-THD-F: 005.0%
PAGE: 06.8

CCr-THD-F:028.2%
PAGE: 06.9

CCy-THD-F:028.2%
PAGE: 06.10

CCb-THD-F:028.2%

Harmonics: Submenu:
Vr-THD-F/R: R-Y line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Vy-THD-F/R: Y-B line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Vb-THD-F/R: B-R line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Ir-THD-F/R: R phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Iy-THD-F/R: Y phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Ib-THD-F/R: B phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
In-THD-F/R: Neutral current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
CCr-THD-F/R: R phase Capacitor current % Total Harmonic Distortion.
CCy-THD-F/R: Y phase Capacitor current % Total Harmonic Distortion.
CCb-THD-F/R: B phase Capacitor current % Total Harmonic Distortion.

- 16 -

PAGE: 07

6.Step KVAR
PRESS
PAGE: 07.1

Stp1 KVAR:0009.0
PAGE: 07.2

Stp2 KVAR:0009.0
PAGE: 07.3

Stp3 KVAR:0009.0
PAGE: 07.4

Stp4 KVAR:0009.0
PAGE: 07.5

Stp5 KVAR:0009.0
PAGE: 07.6

Stp6 KVAR:0009.0

Step KVAR: Submenu:
Stp1 KVAR: Step 1 kVAr value normalized at Capacitor rated voltage.
Stp2 KVAR: Step 2 kVAr value normalized at Capacitor rated voltage.
Stp3 KVAR: Step 3 kVAr value normalized at Capacitor rated voltage.
Stp4 KVAR: Step 4 kVAr value normalized at Capacitor rated voltage.
Stp5 KVAR: Step 5 kVAr value normalized at Capacitor rated voltage.
Stp6 KVAR: Step 6 kVAr value normalized at Capacitor rated voltage.

- 17 -

PAGE: 08

Time: 10:10:00
Real Time Clock: RTC time set in the SPF-25 is displayed here. Its in
HH:MM:SS format.

PAGE: 09

Date: 07:11:06
Real Time Clock: RTC date set in the SPF-25 is displayed here. Its in
dd:mm:yy format.

PAGE: 10

SPF-25 1.0.6

SPF-25 internal firmware version number is displayed here. (Just for user
information)

Total number of Main display pages are 11nos ranging from “00” to
“10”.

- 18 -

Method for Keyboard/Display usage.

Flow chart for entering into different modes:

PRESS
Enable

Default
Display
mode

If Password
Option is
Enable/Disable.

Disable

Enter Pwd: ****
PRESS
Enter the 4
Digit password
By use of
L, R, UP & DN
Keys.

PRESS

NO

IF
PASSWORD
Correct?

*

YES
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

1.Edit Mode

2.Auto Mode

3.Manual Mode

- 19 -

Parameter Editing Submenu Level 1:

*
1.General
2.System
3.Fault
4.Step
5.Communication

Sub-menu
Level 1
for
Parameter
Editing.

Parameter Editing
Sub-Menu
LEVEL 2

1.General and IO: Parameters related with general function and Input/Output
2. System: Electrical system (Mains supply) related parameters.

3. Fault: Setting Faults and fault levels.
4. Step: Capacitor Steps related parameters.
5. Communication: Parameters related with communication and data logging.

- 20 -

Parameter Editing Method:
(For Submenu Level 2 : L2)

Sub-Menu Level 1.
Cursor Blinking
at Parameter Values.

1.Submenu L2: ****

1.Submenu L2: ****
PRESS

key to increment value.

PRESS

Key to decrement value.

PRESS

Key to shift cursor Left.

PRESS

Key to shift cursor Right.
2.Submenu L2: ****

2.Submenu L2: ****
PRESS

key to increment value.

PRESS

Key to decrement value.

PRESS

Key to shift cursor Left.

PRESS

Key to shift cursor Right.

3.Submenu L2: ****

Exit: No Save

Exit: No Save

Without saving

Default
Display.

With saving

Screen for 1second

Saving In EEProm

Exit: With Save

- 21 -

Parameter Editing Submenu Level 2:
Menu
General

Parameter
Pwd
Ch-Pwd
Ld Def
THD
Rst. Energy

Meaning of Parameter
Password Control
Password value
Load all factory default parameters.
Type of THD factor to be displayed
Energy Counters reset to zero option

Default
Enable
1111
No
F-THD
No

Menu
System

Parameter
Meas. Vol.
Ld. Cur. Pr.
Cap. Cur. Pr.
PF Target
PF Target
Auto Sync
Async Tol.
Reset Async

Meaning of Parameter
Default
SPF-25 rated measurement voltage
440
Primary current value of mains CT
0180
0075
Primary current value of capacitor CT
Target PF for deciding Lag or Lead
Lag
1.00
Target PF exact value
Automatic synchronisation requirement Yes
% load variation tolerence for Auto-sync. 30
No
Reset Auto-sync to default value.

Menu
Fault

Parameter
Over Vol.
Over Vol. Lim
Over Vol. Clr
Under Vol.
Under Vol. Lim
Under Vol. Clr
Over Load
Over Ld. Lim
Over Ld. Clr
Under Ld.
Under Ld. Lim
Under Ld. Clr
Ld. Unbalance
Ld. Unb. Lim
Over CC
Over CC. Lim
Over CC. Clr
Over CC. Rst.
Over CC. Rst.
Under CC.
Under CC. Lim
Under CC. CLr
CC THD
CC THD Lim
CC THD Clr
Step Check
Cap. Cur Tol
Under Comp.
RTC Bat

Meaning of Parameter
Default
Over Voltage Fault: action by PDE-30 Off Step
Over Voltage activation limit value
1.10
Over Voltage resumption limit value 1.05
Under Voltage Fault: Action?
Off Step
Under Voltage activation limit value 0.70
Under Voltage resumption limit value 0.75
Over Load Fault: Action?
Indicate
Mains current over load limit value
1.30
Mains cur. over load resume value
1.25
Under Load on Mains: Action?
Indicate
Under load Activation limit value
0.03
Under load Resumption limit value
0.05
Load Un-balance Fault: Action?
Off Step
Load Un-balance limit
025%
Capacitor Over Current Fault: Action? Disable
Cap. Over Current Limit value.
1.30
Cap. Over Current Resume value.
1.25
Auto reset feature on Cap. Over Cur. No
If Over CC. Rst.=Yes. Time for reset. 120 sec
Under Capacitor current fault: Action? Disable
Under Cap. Cur. Limit value.
0.95
Under Cap. Cur. Resume value.
0.97
Capacitor current Over THD: Action? Disable
Cap.Cur. Over THD limit value.
0.10
Cap.Cur. Over THD resume value.
0.08
Every step kVAr healthiness monitor. Disable
Step kVAr healthiness: tolerence.
0.10
Out of Banks Indication.
Disable
RTC Battery fault monitoring.
Enable

- 22 -

Min
Disable
0000
No
R-THD
No
Min
Non
0001
0001
Lead
0.70Lag
No
01
No

Min

Max
Enable
9999
Yes
F-THD
Yes
Max
Edible
9999
9999
Lag
0.85Lead
Yes
50
Yes

Max

Disable, Indicative, Off Step

0.90
0.85

1.20
1.15

Disable, Indicative, Off Step

0.70
0.75

0.95
1.00

Disable, Indicative, Off Step

1.10
1.05

1.30
1.25

Disable, Indicative, Off Step

0.01
0.02

0.20
0.25

Disable, Indicative, Off Step

005%

100%

Disable, Indicative, Off Step

1.05
1.00
No
15

1.50
1.45
Yes
900

Disable, Indicative, Off Step

0.75
0.80

0.98
1.00

Disable, Indicative, Off Step

0.02
0.01
Disable
0.03
Disable
Disable

0.99
0.90
Enable
0.50
Enable
Enable

Menu
Step

Parameter
No. of Steps
Step Vol
Corr. Time
Discharge Time
Step 1 KVAR
Step 2 KVAR
Step 3 KVAR
Step 4 KVAR
Step 5 KVAR
Step 6 KVAR

Meaning of Parameter
Number of Capacitor steps utilised
Voltage at which kVAr is defined
Correction cycle time.
Capacitor discharge time.
Step 1 kVAr value.
Step 2 kVAr value.
Step 3 kVAr value.
Step 4 kVAr value.
Step 5 kVAr value.
Step 6 kVAr value.

Menu
Parameter
Meaning of Parameter
Communication Unit ID
Communication ID of the unit
Baud Rate
Serial communication baud rate.
Time
RTC time to be set
Date
RTC date to be set
Init RTC
Initialise RTC?
Clear NVRAM Clear all contents on NV RAM?

Default
3
440
120 secs
120 secs
006
009
018
018
018
018

Min
1
380
010
010
001
001
001
001
001
001

Default
3001
09600
--No
No

Min
0000
04800
--No
No

Max
6
660
240
240
250
250
250
250
250
250

Max
9999
38400
--Yes
Yes

Note that all the parameters in the Sub-Menu Level 2 should be carefully filled in the
SPF-25. Failing to put the correct parameters can make SPF-25 to malfunction.
Its therefore advised that a trained person should only be allowed to change these
values.

- 23 -

Commissioning Instructions :
before panel is powered up for the first time.
1. Panel Wiring Check
Ensure that all connections in the panel is tightened properly and there are no
loose connections. Also ensure that the wiring is done as per the wiring
diagram.
2. Power Wiring Check
Ensure that the power cables are connected properly from the Panel I/C to the
feeder I/C or the transformer bushings. The connection has to be after the
Load Feed back CT looking from the Transformer side.
Ensure that the Bus Bars and/or Lugs are clean and free of Dust, Corrosion or
Oxidation on the contact sides so that good electrical connection is maintained.
The surface area should be flat so as to get maximum contact area.
If required Clean the Bus Bars and/ or Lugs by rubbing it with Polish Paper to
remove the oxidation layer. Provide contact paste in between the contacts
surfaces.
Not performing this, can result in to a weaker source point for Capacitor
charging during Step on and this can generate undesirable Noise which can
hamper the performance of equipments installed in the capacitor panel.
3. Load Feed Back CT connection.
Ensure that the load feed back CT connections are done properly. Confirm that
correct phase CT is connected with the correct phase input terminals. (Even
though auto sync is capable of taking care of wrong CT polarities or CT
position interchanging, but then on display, the Phase readings may be seen to
be interchanged. (May be R-phase reading would be seen in B-phase and
vice-versa.
CT connections to be done carefully so as to ensure that the wire does not get
open and there is no loose connection.

Loose connection’s or open CT secondary can result in to very high voltages
getting developed in the circuit which can damage the CT and also produce
high levels of noise in the system.

- 24 -

Fault Finding Guidelines :

Fault Type

Probable Reason

Action to Take

Unit Does not
turn ON. No
display on LCD.

•Input auxiliary supply
not coming.
•Input side fuses
blown

•Check the input
supply to restore
•Check fuses in the
unit for OK.

Unit does not
turn On any
capacitors even
if PF is below
Lower PF limit.

•If auto-sync failure
message is there at
Power On.

• Load may be highly
fluctuating so need of
manual
synchronisation only.
• This is OK
condition.

• The load KW is too
low with Under load
fault enable condition.
•Control connections
from SPF-25 to
contactor coils are not
proper

•Check control supply
and connections from
SPF-25 to contactors.

BF indication on
Default display.

• Internal Ni-Cd
3.2Vdc battery used
for RTC and NV RAM
must be drained down.

• Replace this battery
in consultancy with
TAS trained
personnel.

Some Capacitor
banks are
declared as
faulty even if
they are
checked to be
OK.

•Individual step health
monitoring is enabled
and tolerance limits
set are too stringent.
• Capacitor current
THD factor is
continuously
fluctuating.

•Set the tolerance
limits for individual
steps monitoring as
relaxed.
• With continuously
fluctuating THD of
Capacitor current and
higher level of THD
can cause some
errors in individual
step KVAR
measurement. Under
this condition, best is
to keep this feature
disabled.

- 25 -

Fault Finding Guidelines (continued):

Fault Type

Probable Reason

Action to Take

Serial
Communication
is not working.

• Baud rate selection
is not proper.
• Unit ID is not set
properly.
• Serial
communication cable
connections are not
proper.

• Select proper baud
rate.
• Set the unit ID
correctly.
• Check the serial
cable continuity as
per the connections
given earlier in this
manual.

Data logging is
not taking place.

• Possible that RTC
date is not set
properly.

• Change the battery
by help of TAS’s
authorised person.

SPF-25 resets
occasionally on
turning OFF of
any contactor.

• The contactor supply
phase may be the
same as used for SPF25 auxiliary supply.
• RC snubbers/ free
wheeling diodes are
not put with contactor
coils.

• Use the different
phase for control
supply of contactors
and for SPF-25 supply
• Usage of RC
snubbers / free
wheeling diodes is
mandatory.

- 26 -

Corporate Office/Works/Design Centre:
W-61, MIDC, Ambad, Nasik - 422010, Maharashtra (India)
Tel: +91-(253)-2384038 / 2381090
Email: [email protected]
Marketing and After-Sales Service:
A/58, Kamal Pushpa, K.C. Road, Bandra, Mumbai-400050.
Tel: +91-9930513923
Email: [email protected]
Regional Office: Delhi
191-B, Ground Floor, Padam Nagar (Filter Market),
New Delhi - 110007 (India).
Tel: +91-9911615701
Email: [email protected]


Slide 11

Operations Manual
SPF-25/6
AUTOMATIC POWER FACTOR
CONTROLLER

TAS Powertek Pvt. Ltd.
Corporate Office:
W-61, MIDC, Ambad, Nasik - 422010, Maharashtra (India)
Tel: +91-(253)-2384038 / 2381090
Email: [email protected]

NOTE
These instructions do not purport to cover all details or
variations in equipment, nor to provide for every possible
contingency to be met in connection with installation,
operation or maintenance.

Should further information be desired or should particular
problems arise which are not covered sufficiently for the
purchasers purposes, the matter should be referred to our
TAS Powertek Pvt. Ltd., office.
The contents of this instruction Manual shall not become
part of or modify any prior or existing agreement or
relationship. The sales contract contains the entire
obligations of TAS Powertek Pvt. Ltd. The warranty
contained in the contract between the parties is the sole
warranty of TAS Powertek Pvt. Ltd. Any statements
contained herein do not create new warranties or modify the
existing warranty.

The reproduction, transmission or use of this
document or its contents is not permitted
without express written authority. Offenders
will be liable for damages. All rights are
reserved.

Index
Index Page
-----------------Features & Specifications
----------Mechanical Dimensions/ mounting --------Functional Block diagram
-----------------PF correction technique
-----------------Back Side terminals
-----------------------Typical wiring scheme ---------------------Front Facia
---------------------------------Communication connector connections ----Display of various parameters / Status ---Method of Keyboard/Display usage -------Parameter Submenu -----------------------Commissioning Instruction (before Powerup)
Fault finding Guidelines ---------------------

-1-

1
2
3
4
5
6
7
8
9
10
19
22
24
25

Features:
• Totally Micro-processor controlled Digital Signal processing
logic for measurements.
• All measurements with 1.0 class accuracy.
• Automatic Synchronisation capable of giving the correct
results for wrong connections at CT terminals (even wrong
polarity of CTs).
• Measurement and kVAr compensation are frequency / THD
compensated.
• Load V,Iph, In and Cap. current THD measurement.
• Up-to 6 output banks control.
• Capable of doing the kVAr measurements on basis of mean
of the correction cycle time and provide kVAr compensation.
• Standard 144 X 144 cabinet for panel door flush mounting.
• Serial communication through standard TAS protocols.
• Manual testing mode for user checking of the Capacitor steps
switching.
• Protections provided (user settable):
Over/under Voltage
Cap. Over/under current / THD.
Over/Under frequency (internally set limits)
Over / Under load.
Load unbalance.
Capacitor individual step kVAr monitoring.
Out of steps: Under-compensation (only for indication)
NV-RAM battery down.
• Data logging for various parameters for 2months period at an
interval of 1hr.
• Unit comes along with PC (Windows compatible) software
for downloading and viewing the logged data.

Specifications:
•
•
•
•
•
•
•
•
•
•
•
•

Feed-back Voltage:440Volt (+10%/-30%)
Current input : 1Amp for load and capacitor feed-back.
Measurement Accuracy: Class 1.0
Auxiliary Supply: 525Vac to 300Vac.
Correction / Discharge time:
Selectable in seconds from 10sec. to 240sec.
Output commands:
NO contacts each with current rating of 0.5Amp AC. at
240Vac.
RS-232 baud rate selectable from 4.8kBPS to 38.4kBPS.
Operating temperature: 0 to 55oC.
1.0class measurement Operating temperature: 0 to 50oC.
Storage temperature: -10 to +75oC.
Humidity: 0 to 98%.
Supply frequency: 45Hz to 55Hz.

-2-

Mechanical Dimensions:
135

144

135

120
144

6

Recommended size for cutout on panel door is 138 X 138.
All Dimensions given are in mm.

Maximum weight: (with clamps and terminals) = 2.5kg.

-3-

Functional Block Diagram:
3 channel
Current f.b.

3
Channel
Cap.
Current
f.b.

3 channel
Voltage f.b.

SPF-25

V, I, PF and Power
Measurement
Block
For every AC mains
Cycle.

Calculation
Block for
• Energy Parameters
• Harmonic analysis

EEPROM
For Data
Logging

Keyboard,
Display and
Other support
Functions
Block.

RS-232 Serial
Communication.
TAS-01
Protocol stack.

Power Factor
Correction Block
+ event monitoring.

Outputs Commands
For Capacitor
Switching.

Power Supply
Block.

Above block diagram gives the functional blocks that are built into SPF-25 PF
correction relay.
These blocks are made up with the combination of functions from hardware and
corresponding firmware that resides in the Program memory of the micro-processor
used therein.
Even though the basic blocks exists as shown in the diagram, there functionality is
interdependent. The entire combination is carefully designed so as to have
minimum effects of Electrical and Electromagnetic noise level on the functionality of
this SPF-25.
The firmware written takes into various error handling eventualities so that the
functioning of this PF relay is error free and highly reliable.

-4-

PF correction technique:
KVAr Inductive

Target
PF.
Cos Φ
= PF

1.5 X kVAr
Of Smallest
Capacitor bank

KW

No change band.
KVAr Capacitive
Capacitor Addition band.
Capacitor Removal band.
SPF-25 for kVAr compensation works with the kW v/s kVAr diagram as shown here
above.
A band is created across the target PF value. (Target PF is set by user). This band
is of +0.75 of the smallest capacitor bank kVAr. Thus, total band width is always 1.5
times the smallest capacitor bank kVAr used. This is a no change band. If the
mains source parameters are within this band, SPF-25 would not change the
capacitors bank status.
If the mains parameters are out of this “No change band”, then SPF-25 calculates
the correct capacitor bank combination to be added / subtracted and within one
correction cycle brings it within the No change band.
The no change band width is selected as mentioned because it has to prevent unnecessary hunting (switching on/off) of the capacitor banks.

-5-

Back Side terminals:

Voltage
Feed-Back

Auxiliary
Supply

Current
Feed-Back
Output commands.

-6-

Capacitor
Current
Feed-Back

Typical Wiring with SPF-25 PF correction system.
L
O
A
D

L
C
R
+

L
C
R
-

L
C
Y
+

L
C
Y
-

L
C
B
+

L
C
B
-

PH 3
PH 2
PH 1
CCR+
CCRCCY+
CCYCCB+
CCB-

S
P
F
2
5

Auxiliary
Supply

L1
L2

Com
C01
C02
|

C06

Mains Connections:
Phase 1 control:
Neutral control:
Commands:
Load Current CT:
Capacitor Current CT:

-7-

Front Facia of SPF-25:
LCD Display

Step status LED indication
Serial Communication Port

Membrane Keypad

Usage of the UP and DN key makes the LCD display to scroll up
and down. This is used for display of various status as well as for
viewing the On line measured electrical values.
These keys are also used for changing values in Parameters
Editing mode and used for status changing of banks in Manual
mode.
Usage of ENT key is for entering the submenu and / or for setting
up some values.
The L and R keys are used in changing the position of the cursor
from Left to Right and vice-versa.

-8-

RS-232 serial communication 9 pin D connector:

5

4

6

3

7

2

8

1

9
RXD

GND

TXD

RS-232 cable connection Details:

PIN
NO

PC side
Connection

CONNECTION

SPF-25

1

NC

2

RXD

TXD

3

TXD

RXD

GND

GND

4
5
6
7
8
9

NC

-9-

Display of Various Parameters / Status:
PAGE: 00

COSΦ= -0.99 A OK

This is default display screen giving
information on PF, mode and
working status.

COSΦ= -0.99 :This part of the display indicates the Power Factor running value. The
sign –ve indicates that PF is Capacitive and no sign (+ve) indicates that PF is Inductive.
The PF indicated is the overall PF of the three phase system.
A or M :
This part either indicates the letter “A” or letter “M”. The letter A means
that SPF-25 is working in Auto mode.
The letter M means that SPF-25 is presently in Manual mode.
The Auto or Manual modes can be selected by pressing ENT key on this page.
(If Password option is enabled, enter the same by using UP/DN/L/R keys and then
Pressing ENT)
Then by UP or DN key you can stroll between the displays:
“1. Edit Mode”, “2. Auto Mode”, “3.Manual Mode”.
The first one “1.Edit Mode” is for parameter changing. The details of parameter changing
are explained in detail in later part of this manual.
The second and third one as display indicates are for selecting Auto or Manual mode
respectively. The ENT key pressed on selecting the mode desired, puts the SPF-25 into
that mode.
Auto Mode: In this mode SPF-25 works in automatic mode. It switches the capacitor
banks automatically depending on the parameter setting of target PF. This mode is the
default mode and is to be used for unmanned operation of the system controlled by
SPF-25.
Manual Mode: This mode is activated for checking/testing the capacitor banks switching.
Its also used for changing the Masking status of the capacitor banks. More on this is
explained later. (On Page 01 explanation)
OK or ** :
The last part of the display that is blinking every 500mS indicates the
working status of SPF-25. “OK” indicates that unit is working fine without any trip
conditions. If there is other indication, the meaning of the same can be as:
OK
:
No Fault
OC
:
Over Capacitor Current
UC
:
Under Capacitor Current
OL
:
Over Load
UL
:
Under Load
OV
:
Over Voltage
UV
:
Under Voltage
OF
:
Over Frequency
UF
:
Under Frequency
OH
:
Over Capacitor Current THD %.
OB
:
Out of Banks
LU
:
Load Unbalance
BF
:
Battery Failure (RTC)
NV
:
NVRAM Checksum Error
VA
:
Voltage Absent
- 10 -

PAGE: 01

PAGE: 01

______

AUTO

______

MAN

This display indicates the Bank status in Auto mode and in Manual mode it helps
to make the specific bank On or Off or declare masked.
: Means Bank is On.
: Means Bank is Off.
: Means Bank is Off and is declared masked (out of action)
: Means Bank does not exist for compensation.
When the Page 01 is in Auto mode, its only for indication of Bank status.
But in Manual mode, the “ENT” key press activates the manual control
mode. The cursor over the bank number starts blinking. The UP and DN
keys can turn On and Off the respective bank.
The DN key pressed puts the respective bank in Masking mode and another
press of DN key brings it out of Masking mode.

Putting the bank masking status permanently:
If a bank is to be permanently put in masked mode or is to be brought out of
permanent masked mode, it can be done by bringing the blinking cursor on
the position of the respective bank by use of L or R key. Then by pressing
DN key, bring the status of the bank to the required level (Masked or
Unmasked). Then press ENT key so that cursor stops blinking. After that by
pressing UP key go to Page 00. Then Press ENT. (If Password option is
enabled, enter the same by using UP/DN/L/R keys and then Press ENT)
“1.EDIT MODE” would be displayed. Press ENT one more time. “1.General
and IO” would be displayed. Press ENT again. “Pwd : Disable” or “Pwd :
Enable” would be displayed. Press UP key. “Exit: No Save” would be
displayed. Press ENT so that cursor will start blinking. Press UP. “Exit: With
Save” would be displayed with cursor blinking. Press ENT. “Saving in
EEPROM” would be displayed for a short time and then Page 00 would be
displayed.
You will observe that the bank status as requirement is changed
permanently to the status desired.

- 11 -

PAGE: 02

1.Overall Values
PRESS
PAGE: 02.1

Avg Vol: 415.7 V
PAGE: 02.2

Avg Cur: 0123.4A
PAGE: 02.3

Tot KW:

0081.2

PAGE: 02.4

TotKVAR: 0024.6
PAGE: 02.5

Tot KVA: 0101.1
PAGE: 02.6

Avg CC:

0031.3A

PAGE: 02.7

CKVAR:

028.35

PAGE: 02.8

LS PF:

0.82

PAGE: 02.9

LS KVAR: 0043.9
PAGE: 02.10

LS KVA:

0125.7

PAGE: 02.11

Freq:

49.9Hz

The Overall values Display menu has submenus as displayed above. As its
self explanatory it means:
Avg Vol: Average voltage of all the three line to line voltage values.
Avg Cur: Average current of all the three phase line current values.
Tot KW: Overall kW of the three phase system measured at source.
TotKVAR: Overall kVAr of the three phase system measured at source.
Tot KVA: Overall kVA of the three phase system measured at source.
Avg CC: Average of three phase current through capacitor panel.
CKVAR: Capacitive kVAr that is compensated by the system.
LS PF: Load side PF. (PF value if not compensated.
LS KVAR: Load side kVAr.
LS KVA: Load side kVA.
Freq: Supply frequency in Hz.
- 12 -

PAGE: 03

2.Per-Phase RMS

PRESS
PAGE: 03.1

R-Y Vol: 415.7 V
PAGE: 03.2

Y-B Vol: 415.7 V
PAGE: 03.3

B-R Vol: 415.7 V
PAGE: 03.4

Rph Cur: 0110.8A
PAGE: 03.5

Yph Cur: 0110.8A
PAGE: 03.6

Bph Cur: 0110.8A
PAGE: 03.7

Neutral: 0010.2A
PAGE: 03.8

Rph Cap: 0022.5A
PAGE: 03.9

Yph Cap: 0022.5A
PAGE: 03.10

Bph Cap: 0022.5A

Per Phase RMS: Submenu:
R-Y Vol: Measured AC Voltage RMS value across R and Y phase.
Y-B Vol: Measured AC Voltage RMS value across Y and B phase.
B-R Vol: Measured AC Voltage RMS value across B and R phase.
Rph Cur: Line current RMS value in R phase. Mains source.
Yph Cur: Line current RMS value in Y phase. Mains source.
Bph Cur: Line current RMS value in B phase. Mains source.
Neutral: Neutral current RMS value.
Rph Cap: Capacitor current RMS value in R phase.
Yph Cap: Capacitor current RMS value in Y phase.
Bph Cap: Capacitor current RMS value in B phase.

- 13 -

PAGE: 04

3.Power
PRESS
PAGE: 04.1

Rph PF:

PAGE: 04.10

1.00

Rph KVA: 0109.7

PAGE: 04.2

Yph PF:

PAGE: 04.11

1.00

Yph KVA: 0109.7

PAGE: 04.3

Bph PF:

PAGE: 04.12

1.00

Bph KVA: 0109.7

PAGE: 04.4

Rph KW:

PAGE: 04.13

0100.2

RphCKVAR: 010.76

PAGE: 04.5

Yph KW:

PAGE: 04.14

0100.2

YphCKVAR: 010.76

PAGE: 04.6

Bph KW:

PAGE: 04.15

0100.2

BphCKVAR: 010.76

PAGE: 04.7

PAGE: 04.16

RphKVAR: 0020.4

Rph mF

PAGE: 04.8

: 165.06

PAGE: 04.17

YphKVAR: 0020.4

Yph mF

PAGE: 04.9

: 165.06

PAGE: 04.18

BphKVAR: 0020.4

Bph mF

: 165.06

Power: Submenu:
Rph PF: Power Factor of R phase on mains source.
Yph PF: Power Factor of Y phase on mains source.
Bph PF: Power Factor of B phase on mains source.
Rph kW: Active Power in kW in R-phase.
Yph kW: Active Power in kW in Y-phase.
Bph kW: Active Power in kW in B-phase.
RphkVAR: Reactive Power in kVAr in R-phase.
YphkVAR: Reactive Power in kVAr in Y-phase.
BphkVAR: Reactive Power in kVAr in B-phase.
Rph KVA: Apparent Power in kVA in R-phase.
Yph KVA: Apparent Power in kVA in Y-phase.
Bph KVA: Apparent Power in kVA in B-phase.
RphCKVAR: Capacitor injected reactive power in R-phase.
YphCKVAR: Capacitor injected reactive power in Y-phase.
BphCKVAR: Capacitor injected reactive power in B-phase.
Rph mF: Capacitor value in micro-farad in R-phase.
Yph mF: Capacitor value in micro-farad in Y-phase.
Bph mF: Capacitor value in micro-farad in B-phase.
- 14 -

PAGE: 05

4.Energy
PRESS
PAGE: 05.1

KWH:

1234567.8

PAGE: 05.2

IndKVARH:12345.6
PAGE: 05.3

CapKVARH:12345.6
PAGE: 05.4

KVAH:

1234567.8

PAGE: 05.5

CKVARH:1234567.8

Energy: Submenu:
KWH: Overall cumulative active energy in kWh on Mains supply.
IndKVARH: Inductive reactive energy in kVArh on Mains supply.
CapKVARH: Capacitive reactive energy in kVArh on Mains supply.
KVAH: Overall cumulative apparent energy in kVA on Mains supply.
CKVARH: Capacitor compensated reactive energy in kVArh.

- 15 -

PAGE: 06

5.Harmonics
PRESS
PAGE: 06.1

Vr-THD-F: 002.4%
PAGE: 06.2

Vy-THD-F: 002.4%
PAGE: 06.3

Vb-THD-F: 002.4%
PAGE: 06.4

Ir-THD-F: 012.5%
PAGE: 06.5

Iy-THD-F: 012.5%
PAGE: 06.6

Ib-THD-F: 012.5%
PAGE: 06.7

In-THD-F: 005.0%
PAGE: 06.8

CCr-THD-F:028.2%
PAGE: 06.9

CCy-THD-F:028.2%
PAGE: 06.10

CCb-THD-F:028.2%

Harmonics: Submenu:
Vr-THD-F/R: R-Y line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Vy-THD-F/R: Y-B line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Vb-THD-F/R: B-R line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Ir-THD-F/R: R phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Iy-THD-F/R: Y phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Ib-THD-F/R: B phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
In-THD-F/R: Neutral current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
CCr-THD-F/R: R phase Capacitor current % Total Harmonic Distortion.
CCy-THD-F/R: Y phase Capacitor current % Total Harmonic Distortion.
CCb-THD-F/R: B phase Capacitor current % Total Harmonic Distortion.

- 16 -

PAGE: 07

6.Step KVAR
PRESS
PAGE: 07.1

Stp1 KVAR:0009.0
PAGE: 07.2

Stp2 KVAR:0009.0
PAGE: 07.3

Stp3 KVAR:0009.0
PAGE: 07.4

Stp4 KVAR:0009.0
PAGE: 07.5

Stp5 KVAR:0009.0
PAGE: 07.6

Stp6 KVAR:0009.0

Step KVAR: Submenu:
Stp1 KVAR: Step 1 kVAr value normalized at Capacitor rated voltage.
Stp2 KVAR: Step 2 kVAr value normalized at Capacitor rated voltage.
Stp3 KVAR: Step 3 kVAr value normalized at Capacitor rated voltage.
Stp4 KVAR: Step 4 kVAr value normalized at Capacitor rated voltage.
Stp5 KVAR: Step 5 kVAr value normalized at Capacitor rated voltage.
Stp6 KVAR: Step 6 kVAr value normalized at Capacitor rated voltage.

- 17 -

PAGE: 08

Time: 10:10:00
Real Time Clock: RTC time set in the SPF-25 is displayed here. Its in
HH:MM:SS format.

PAGE: 09

Date: 07:11:06
Real Time Clock: RTC date set in the SPF-25 is displayed here. Its in
dd:mm:yy format.

PAGE: 10

SPF-25 1.0.6

SPF-25 internal firmware version number is displayed here. (Just for user
information)

Total number of Main display pages are 11nos ranging from “00” to
“10”.

- 18 -

Method for Keyboard/Display usage.

Flow chart for entering into different modes:

PRESS
Enable

Default
Display
mode

If Password
Option is
Enable/Disable.

Disable

Enter Pwd: ****
PRESS
Enter the 4
Digit password
By use of
L, R, UP & DN
Keys.

PRESS

NO

IF
PASSWORD
Correct?

*

YES
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

1.Edit Mode

2.Auto Mode

3.Manual Mode

- 19 -

Parameter Editing Submenu Level 1:

*
1.General
2.System
3.Fault
4.Step
5.Communication

Sub-menu
Level 1
for
Parameter
Editing.

Parameter Editing
Sub-Menu
LEVEL 2

1.General and IO: Parameters related with general function and Input/Output
2. System: Electrical system (Mains supply) related parameters.

3. Fault: Setting Faults and fault levels.
4. Step: Capacitor Steps related parameters.
5. Communication: Parameters related with communication and data logging.

- 20 -

Parameter Editing Method:
(For Submenu Level 2 : L2)

Sub-Menu Level 1.
Cursor Blinking
at Parameter Values.

1.Submenu L2: ****

1.Submenu L2: ****
PRESS

key to increment value.

PRESS

Key to decrement value.

PRESS

Key to shift cursor Left.

PRESS

Key to shift cursor Right.
2.Submenu L2: ****

2.Submenu L2: ****
PRESS

key to increment value.

PRESS

Key to decrement value.

PRESS

Key to shift cursor Left.

PRESS

Key to shift cursor Right.

3.Submenu L2: ****

Exit: No Save

Exit: No Save

Without saving

Default
Display.

With saving

Screen for 1second

Saving In EEProm

Exit: With Save

- 21 -

Parameter Editing Submenu Level 2:
Menu
General

Parameter
Pwd
Ch-Pwd
Ld Def
THD
Rst. Energy

Meaning of Parameter
Password Control
Password value
Load all factory default parameters.
Type of THD factor to be displayed
Energy Counters reset to zero option

Default
Enable
1111
No
F-THD
No

Menu
System

Parameter
Meas. Vol.
Ld. Cur. Pr.
Cap. Cur. Pr.
PF Target
PF Target
Auto Sync
Async Tol.
Reset Async

Meaning of Parameter
Default
SPF-25 rated measurement voltage
440
Primary current value of mains CT
0180
0075
Primary current value of capacitor CT
Target PF for deciding Lag or Lead
Lag
1.00
Target PF exact value
Automatic synchronisation requirement Yes
% load variation tolerence for Auto-sync. 30
No
Reset Auto-sync to default value.

Menu
Fault

Parameter
Over Vol.
Over Vol. Lim
Over Vol. Clr
Under Vol.
Under Vol. Lim
Under Vol. Clr
Over Load
Over Ld. Lim
Over Ld. Clr
Under Ld.
Under Ld. Lim
Under Ld. Clr
Ld. Unbalance
Ld. Unb. Lim
Over CC
Over CC. Lim
Over CC. Clr
Over CC. Rst.
Over CC. Rst.
Under CC.
Under CC. Lim
Under CC. CLr
CC THD
CC THD Lim
CC THD Clr
Step Check
Cap. Cur Tol
Under Comp.
RTC Bat

Meaning of Parameter
Default
Over Voltage Fault: action by PDE-30 Off Step
Over Voltage activation limit value
1.10
Over Voltage resumption limit value 1.05
Under Voltage Fault: Action?
Off Step
Under Voltage activation limit value 0.70
Under Voltage resumption limit value 0.75
Over Load Fault: Action?
Indicate
Mains current over load limit value
1.30
Mains cur. over load resume value
1.25
Under Load on Mains: Action?
Indicate
Under load Activation limit value
0.03
Under load Resumption limit value
0.05
Load Un-balance Fault: Action?
Off Step
Load Un-balance limit
025%
Capacitor Over Current Fault: Action? Disable
Cap. Over Current Limit value.
1.30
Cap. Over Current Resume value.
1.25
Auto reset feature on Cap. Over Cur. No
If Over CC. Rst.=Yes. Time for reset. 120 sec
Under Capacitor current fault: Action? Disable
Under Cap. Cur. Limit value.
0.95
Under Cap. Cur. Resume value.
0.97
Capacitor current Over THD: Action? Disable
Cap.Cur. Over THD limit value.
0.10
Cap.Cur. Over THD resume value.
0.08
Every step kVAr healthiness monitor. Disable
Step kVAr healthiness: tolerence.
0.10
Out of Banks Indication.
Disable
RTC Battery fault monitoring.
Enable

- 22 -

Min
Disable
0000
No
R-THD
No
Min
Non
0001
0001
Lead
0.70Lag
No
01
No

Min

Max
Enable
9999
Yes
F-THD
Yes
Max
Edible
9999
9999
Lag
0.85Lead
Yes
50
Yes

Max

Disable, Indicative, Off Step

0.90
0.85

1.20
1.15

Disable, Indicative, Off Step

0.70
0.75

0.95
1.00

Disable, Indicative, Off Step

1.10
1.05

1.30
1.25

Disable, Indicative, Off Step

0.01
0.02

0.20
0.25

Disable, Indicative, Off Step

005%

100%

Disable, Indicative, Off Step

1.05
1.00
No
15

1.50
1.45
Yes
900

Disable, Indicative, Off Step

0.75
0.80

0.98
1.00

Disable, Indicative, Off Step

0.02
0.01
Disable
0.03
Disable
Disable

0.99
0.90
Enable
0.50
Enable
Enable

Menu
Step

Parameter
No. of Steps
Step Vol
Corr. Time
Discharge Time
Step 1 KVAR
Step 2 KVAR
Step 3 KVAR
Step 4 KVAR
Step 5 KVAR
Step 6 KVAR

Meaning of Parameter
Number of Capacitor steps utilised
Voltage at which kVAr is defined
Correction cycle time.
Capacitor discharge time.
Step 1 kVAr value.
Step 2 kVAr value.
Step 3 kVAr value.
Step 4 kVAr value.
Step 5 kVAr value.
Step 6 kVAr value.

Menu
Parameter
Meaning of Parameter
Communication Unit ID
Communication ID of the unit
Baud Rate
Serial communication baud rate.
Time
RTC time to be set
Date
RTC date to be set
Init RTC
Initialise RTC?
Clear NVRAM Clear all contents on NV RAM?

Default
3
440
120 secs
120 secs
006
009
018
018
018
018

Min
1
380
010
010
001
001
001
001
001
001

Default
3001
09600
--No
No

Min
0000
04800
--No
No

Max
6
660
240
240
250
250
250
250
250
250

Max
9999
38400
--Yes
Yes

Note that all the parameters in the Sub-Menu Level 2 should be carefully filled in the
SPF-25. Failing to put the correct parameters can make SPF-25 to malfunction.
Its therefore advised that a trained person should only be allowed to change these
values.

- 23 -

Commissioning Instructions :
before panel is powered up for the first time.
1. Panel Wiring Check
Ensure that all connections in the panel is tightened properly and there are no
loose connections. Also ensure that the wiring is done as per the wiring
diagram.
2. Power Wiring Check
Ensure that the power cables are connected properly from the Panel I/C to the
feeder I/C or the transformer bushings. The connection has to be after the
Load Feed back CT looking from the Transformer side.
Ensure that the Bus Bars and/or Lugs are clean and free of Dust, Corrosion or
Oxidation on the contact sides so that good electrical connection is maintained.
The surface area should be flat so as to get maximum contact area.
If required Clean the Bus Bars and/ or Lugs by rubbing it with Polish Paper to
remove the oxidation layer. Provide contact paste in between the contacts
surfaces.
Not performing this, can result in to a weaker source point for Capacitor
charging during Step on and this can generate undesirable Noise which can
hamper the performance of equipments installed in the capacitor panel.
3. Load Feed Back CT connection.
Ensure that the load feed back CT connections are done properly. Confirm that
correct phase CT is connected with the correct phase input terminals. (Even
though auto sync is capable of taking care of wrong CT polarities or CT
position interchanging, but then on display, the Phase readings may be seen to
be interchanged. (May be R-phase reading would be seen in B-phase and
vice-versa.
CT connections to be done carefully so as to ensure that the wire does not get
open and there is no loose connection.

Loose connection’s or open CT secondary can result in to very high voltages
getting developed in the circuit which can damage the CT and also produce
high levels of noise in the system.

- 24 -

Fault Finding Guidelines :

Fault Type

Probable Reason

Action to Take

Unit Does not
turn ON. No
display on LCD.

•Input auxiliary supply
not coming.
•Input side fuses
blown

•Check the input
supply to restore
•Check fuses in the
unit for OK.

Unit does not
turn On any
capacitors even
if PF is below
Lower PF limit.

•If auto-sync failure
message is there at
Power On.

• Load may be highly
fluctuating so need of
manual
synchronisation only.
• This is OK
condition.

• The load KW is too
low with Under load
fault enable condition.
•Control connections
from SPF-25 to
contactor coils are not
proper

•Check control supply
and connections from
SPF-25 to contactors.

BF indication on
Default display.

• Internal Ni-Cd
3.2Vdc battery used
for RTC and NV RAM
must be drained down.

• Replace this battery
in consultancy with
TAS trained
personnel.

Some Capacitor
banks are
declared as
faulty even if
they are
checked to be
OK.

•Individual step health
monitoring is enabled
and tolerance limits
set are too stringent.
• Capacitor current
THD factor is
continuously
fluctuating.

•Set the tolerance
limits for individual
steps monitoring as
relaxed.
• With continuously
fluctuating THD of
Capacitor current and
higher level of THD
can cause some
errors in individual
step KVAR
measurement. Under
this condition, best is
to keep this feature
disabled.

- 25 -

Fault Finding Guidelines (continued):

Fault Type

Probable Reason

Action to Take

Serial
Communication
is not working.

• Baud rate selection
is not proper.
• Unit ID is not set
properly.
• Serial
communication cable
connections are not
proper.

• Select proper baud
rate.
• Set the unit ID
correctly.
• Check the serial
cable continuity as
per the connections
given earlier in this
manual.

Data logging is
not taking place.

• Possible that RTC
date is not set
properly.

• Change the battery
by help of TAS’s
authorised person.

SPF-25 resets
occasionally on
turning OFF of
any contactor.

• The contactor supply
phase may be the
same as used for SPF25 auxiliary supply.
• RC snubbers/ free
wheeling diodes are
not put with contactor
coils.

• Use the different
phase for control
supply of contactors
and for SPF-25 supply
• Usage of RC
snubbers / free
wheeling diodes is
mandatory.

- 26 -

Corporate Office/Works/Design Centre:
W-61, MIDC, Ambad, Nasik - 422010, Maharashtra (India)
Tel: +91-(253)-2384038 / 2381090
Email: [email protected]
Marketing and After-Sales Service:
A/58, Kamal Pushpa, K.C. Road, Bandra, Mumbai-400050.
Tel: +91-9930513923
Email: [email protected]
Regional Office: Delhi
191-B, Ground Floor, Padam Nagar (Filter Market),
New Delhi - 110007 (India).
Tel: +91-9911615701
Email: [email protected]


Slide 12

Operations Manual
SPF-25/6
AUTOMATIC POWER FACTOR
CONTROLLER

TAS Powertek Pvt. Ltd.
Corporate Office:
W-61, MIDC, Ambad, Nasik - 422010, Maharashtra (India)
Tel: +91-(253)-2384038 / 2381090
Email: [email protected]

NOTE
These instructions do not purport to cover all details or
variations in equipment, nor to provide for every possible
contingency to be met in connection with installation,
operation or maintenance.

Should further information be desired or should particular
problems arise which are not covered sufficiently for the
purchasers purposes, the matter should be referred to our
TAS Powertek Pvt. Ltd., office.
The contents of this instruction Manual shall not become
part of or modify any prior or existing agreement or
relationship. The sales contract contains the entire
obligations of TAS Powertek Pvt. Ltd. The warranty
contained in the contract between the parties is the sole
warranty of TAS Powertek Pvt. Ltd. Any statements
contained herein do not create new warranties or modify the
existing warranty.

The reproduction, transmission or use of this
document or its contents is not permitted
without express written authority. Offenders
will be liable for damages. All rights are
reserved.

Index
Index Page
-----------------Features & Specifications
----------Mechanical Dimensions/ mounting --------Functional Block diagram
-----------------PF correction technique
-----------------Back Side terminals
-----------------------Typical wiring scheme ---------------------Front Facia
---------------------------------Communication connector connections ----Display of various parameters / Status ---Method of Keyboard/Display usage -------Parameter Submenu -----------------------Commissioning Instruction (before Powerup)
Fault finding Guidelines ---------------------

-1-

1
2
3
4
5
6
7
8
9
10
19
22
24
25

Features:
• Totally Micro-processor controlled Digital Signal processing
logic for measurements.
• All measurements with 1.0 class accuracy.
• Automatic Synchronisation capable of giving the correct
results for wrong connections at CT terminals (even wrong
polarity of CTs).
• Measurement and kVAr compensation are frequency / THD
compensated.
• Load V,Iph, In and Cap. current THD measurement.
• Up-to 6 output banks control.
• Capable of doing the kVAr measurements on basis of mean
of the correction cycle time and provide kVAr compensation.
• Standard 144 X 144 cabinet for panel door flush mounting.
• Serial communication through standard TAS protocols.
• Manual testing mode for user checking of the Capacitor steps
switching.
• Protections provided (user settable):
Over/under Voltage
Cap. Over/under current / THD.
Over/Under frequency (internally set limits)
Over / Under load.
Load unbalance.
Capacitor individual step kVAr monitoring.
Out of steps: Under-compensation (only for indication)
NV-RAM battery down.
• Data logging for various parameters for 2months period at an
interval of 1hr.
• Unit comes along with PC (Windows compatible) software
for downloading and viewing the logged data.

Specifications:
•
•
•
•
•
•
•
•
•
•
•
•

Feed-back Voltage:440Volt (+10%/-30%)
Current input : 1Amp for load and capacitor feed-back.
Measurement Accuracy: Class 1.0
Auxiliary Supply: 525Vac to 300Vac.
Correction / Discharge time:
Selectable in seconds from 10sec. to 240sec.
Output commands:
NO contacts each with current rating of 0.5Amp AC. at
240Vac.
RS-232 baud rate selectable from 4.8kBPS to 38.4kBPS.
Operating temperature: 0 to 55oC.
1.0class measurement Operating temperature: 0 to 50oC.
Storage temperature: -10 to +75oC.
Humidity: 0 to 98%.
Supply frequency: 45Hz to 55Hz.

-2-

Mechanical Dimensions:
135

144

135

120
144

6

Recommended size for cutout on panel door is 138 X 138.
All Dimensions given are in mm.

Maximum weight: (with clamps and terminals) = 2.5kg.

-3-

Functional Block Diagram:
3 channel
Current f.b.

3
Channel
Cap.
Current
f.b.

3 channel
Voltage f.b.

SPF-25

V, I, PF and Power
Measurement
Block
For every AC mains
Cycle.

Calculation
Block for
• Energy Parameters
• Harmonic analysis

EEPROM
For Data
Logging

Keyboard,
Display and
Other support
Functions
Block.

RS-232 Serial
Communication.
TAS-01
Protocol stack.

Power Factor
Correction Block
+ event monitoring.

Outputs Commands
For Capacitor
Switching.

Power Supply
Block.

Above block diagram gives the functional blocks that are built into SPF-25 PF
correction relay.
These blocks are made up with the combination of functions from hardware and
corresponding firmware that resides in the Program memory of the micro-processor
used therein.
Even though the basic blocks exists as shown in the diagram, there functionality is
interdependent. The entire combination is carefully designed so as to have
minimum effects of Electrical and Electromagnetic noise level on the functionality of
this SPF-25.
The firmware written takes into various error handling eventualities so that the
functioning of this PF relay is error free and highly reliable.

-4-

PF correction technique:
KVAr Inductive

Target
PF.
Cos Φ
= PF

1.5 X kVAr
Of Smallest
Capacitor bank

KW

No change band.
KVAr Capacitive
Capacitor Addition band.
Capacitor Removal band.
SPF-25 for kVAr compensation works with the kW v/s kVAr diagram as shown here
above.
A band is created across the target PF value. (Target PF is set by user). This band
is of +0.75 of the smallest capacitor bank kVAr. Thus, total band width is always 1.5
times the smallest capacitor bank kVAr used. This is a no change band. If the
mains source parameters are within this band, SPF-25 would not change the
capacitors bank status.
If the mains parameters are out of this “No change band”, then SPF-25 calculates
the correct capacitor bank combination to be added / subtracted and within one
correction cycle brings it within the No change band.
The no change band width is selected as mentioned because it has to prevent unnecessary hunting (switching on/off) of the capacitor banks.

-5-

Back Side terminals:

Voltage
Feed-Back

Auxiliary
Supply

Current
Feed-Back
Output commands.

-6-

Capacitor
Current
Feed-Back

Typical Wiring with SPF-25 PF correction system.
L
O
A
D

L
C
R
+

L
C
R
-

L
C
Y
+

L
C
Y
-

L
C
B
+

L
C
B
-

PH 3
PH 2
PH 1
CCR+
CCRCCY+
CCYCCB+
CCB-

S
P
F
2
5

Auxiliary
Supply

L1
L2

Com
C01
C02
|

C06

Mains Connections:
Phase 1 control:
Neutral control:
Commands:
Load Current CT:
Capacitor Current CT:

-7-

Front Facia of SPF-25:
LCD Display

Step status LED indication
Serial Communication Port

Membrane Keypad

Usage of the UP and DN key makes the LCD display to scroll up
and down. This is used for display of various status as well as for
viewing the On line measured electrical values.
These keys are also used for changing values in Parameters
Editing mode and used for status changing of banks in Manual
mode.
Usage of ENT key is for entering the submenu and / or for setting
up some values.
The L and R keys are used in changing the position of the cursor
from Left to Right and vice-versa.

-8-

RS-232 serial communication 9 pin D connector:

5

4

6

3

7

2

8

1

9
RXD

GND

TXD

RS-232 cable connection Details:

PIN
NO

PC side
Connection

CONNECTION

SPF-25

1

NC

2

RXD

TXD

3

TXD

RXD

GND

GND

4
5
6
7
8
9

NC

-9-

Display of Various Parameters / Status:
PAGE: 00

COSΦ= -0.99 A OK

This is default display screen giving
information on PF, mode and
working status.

COSΦ= -0.99 :This part of the display indicates the Power Factor running value. The
sign –ve indicates that PF is Capacitive and no sign (+ve) indicates that PF is Inductive.
The PF indicated is the overall PF of the three phase system.
A or M :
This part either indicates the letter “A” or letter “M”. The letter A means
that SPF-25 is working in Auto mode.
The letter M means that SPF-25 is presently in Manual mode.
The Auto or Manual modes can be selected by pressing ENT key on this page.
(If Password option is enabled, enter the same by using UP/DN/L/R keys and then
Pressing ENT)
Then by UP or DN key you can stroll between the displays:
“1. Edit Mode”, “2. Auto Mode”, “3.Manual Mode”.
The first one “1.Edit Mode” is for parameter changing. The details of parameter changing
are explained in detail in later part of this manual.
The second and third one as display indicates are for selecting Auto or Manual mode
respectively. The ENT key pressed on selecting the mode desired, puts the SPF-25 into
that mode.
Auto Mode: In this mode SPF-25 works in automatic mode. It switches the capacitor
banks automatically depending on the parameter setting of target PF. This mode is the
default mode and is to be used for unmanned operation of the system controlled by
SPF-25.
Manual Mode: This mode is activated for checking/testing the capacitor banks switching.
Its also used for changing the Masking status of the capacitor banks. More on this is
explained later. (On Page 01 explanation)
OK or ** :
The last part of the display that is blinking every 500mS indicates the
working status of SPF-25. “OK” indicates that unit is working fine without any trip
conditions. If there is other indication, the meaning of the same can be as:
OK
:
No Fault
OC
:
Over Capacitor Current
UC
:
Under Capacitor Current
OL
:
Over Load
UL
:
Under Load
OV
:
Over Voltage
UV
:
Under Voltage
OF
:
Over Frequency
UF
:
Under Frequency
OH
:
Over Capacitor Current THD %.
OB
:
Out of Banks
LU
:
Load Unbalance
BF
:
Battery Failure (RTC)
NV
:
NVRAM Checksum Error
VA
:
Voltage Absent
- 10 -

PAGE: 01

PAGE: 01

______

AUTO

______

MAN

This display indicates the Bank status in Auto mode and in Manual mode it helps
to make the specific bank On or Off or declare masked.
: Means Bank is On.
: Means Bank is Off.
: Means Bank is Off and is declared masked (out of action)
: Means Bank does not exist for compensation.
When the Page 01 is in Auto mode, its only for indication of Bank status.
But in Manual mode, the “ENT” key press activates the manual control
mode. The cursor over the bank number starts blinking. The UP and DN
keys can turn On and Off the respective bank.
The DN key pressed puts the respective bank in Masking mode and another
press of DN key brings it out of Masking mode.

Putting the bank masking status permanently:
If a bank is to be permanently put in masked mode or is to be brought out of
permanent masked mode, it can be done by bringing the blinking cursor on
the position of the respective bank by use of L or R key. Then by pressing
DN key, bring the status of the bank to the required level (Masked or
Unmasked). Then press ENT key so that cursor stops blinking. After that by
pressing UP key go to Page 00. Then Press ENT. (If Password option is
enabled, enter the same by using UP/DN/L/R keys and then Press ENT)
“1.EDIT MODE” would be displayed. Press ENT one more time. “1.General
and IO” would be displayed. Press ENT again. “Pwd : Disable” or “Pwd :
Enable” would be displayed. Press UP key. “Exit: No Save” would be
displayed. Press ENT so that cursor will start blinking. Press UP. “Exit: With
Save” would be displayed with cursor blinking. Press ENT. “Saving in
EEPROM” would be displayed for a short time and then Page 00 would be
displayed.
You will observe that the bank status as requirement is changed
permanently to the status desired.

- 11 -

PAGE: 02

1.Overall Values
PRESS
PAGE: 02.1

Avg Vol: 415.7 V
PAGE: 02.2

Avg Cur: 0123.4A
PAGE: 02.3

Tot KW:

0081.2

PAGE: 02.4

TotKVAR: 0024.6
PAGE: 02.5

Tot KVA: 0101.1
PAGE: 02.6

Avg CC:

0031.3A

PAGE: 02.7

CKVAR:

028.35

PAGE: 02.8

LS PF:

0.82

PAGE: 02.9

LS KVAR: 0043.9
PAGE: 02.10

LS KVA:

0125.7

PAGE: 02.11

Freq:

49.9Hz

The Overall values Display menu has submenus as displayed above. As its
self explanatory it means:
Avg Vol: Average voltage of all the three line to line voltage values.
Avg Cur: Average current of all the three phase line current values.
Tot KW: Overall kW of the three phase system measured at source.
TotKVAR: Overall kVAr of the three phase system measured at source.
Tot KVA: Overall kVA of the three phase system measured at source.
Avg CC: Average of three phase current through capacitor panel.
CKVAR: Capacitive kVAr that is compensated by the system.
LS PF: Load side PF. (PF value if not compensated.
LS KVAR: Load side kVAr.
LS KVA: Load side kVA.
Freq: Supply frequency in Hz.
- 12 -

PAGE: 03

2.Per-Phase RMS

PRESS
PAGE: 03.1

R-Y Vol: 415.7 V
PAGE: 03.2

Y-B Vol: 415.7 V
PAGE: 03.3

B-R Vol: 415.7 V
PAGE: 03.4

Rph Cur: 0110.8A
PAGE: 03.5

Yph Cur: 0110.8A
PAGE: 03.6

Bph Cur: 0110.8A
PAGE: 03.7

Neutral: 0010.2A
PAGE: 03.8

Rph Cap: 0022.5A
PAGE: 03.9

Yph Cap: 0022.5A
PAGE: 03.10

Bph Cap: 0022.5A

Per Phase RMS: Submenu:
R-Y Vol: Measured AC Voltage RMS value across R and Y phase.
Y-B Vol: Measured AC Voltage RMS value across Y and B phase.
B-R Vol: Measured AC Voltage RMS value across B and R phase.
Rph Cur: Line current RMS value in R phase. Mains source.
Yph Cur: Line current RMS value in Y phase. Mains source.
Bph Cur: Line current RMS value in B phase. Mains source.
Neutral: Neutral current RMS value.
Rph Cap: Capacitor current RMS value in R phase.
Yph Cap: Capacitor current RMS value in Y phase.
Bph Cap: Capacitor current RMS value in B phase.

- 13 -

PAGE: 04

3.Power
PRESS
PAGE: 04.1

Rph PF:

PAGE: 04.10

1.00

Rph KVA: 0109.7

PAGE: 04.2

Yph PF:

PAGE: 04.11

1.00

Yph KVA: 0109.7

PAGE: 04.3

Bph PF:

PAGE: 04.12

1.00

Bph KVA: 0109.7

PAGE: 04.4

Rph KW:

PAGE: 04.13

0100.2

RphCKVAR: 010.76

PAGE: 04.5

Yph KW:

PAGE: 04.14

0100.2

YphCKVAR: 010.76

PAGE: 04.6

Bph KW:

PAGE: 04.15

0100.2

BphCKVAR: 010.76

PAGE: 04.7

PAGE: 04.16

RphKVAR: 0020.4

Rph mF

PAGE: 04.8

: 165.06

PAGE: 04.17

YphKVAR: 0020.4

Yph mF

PAGE: 04.9

: 165.06

PAGE: 04.18

BphKVAR: 0020.4

Bph mF

: 165.06

Power: Submenu:
Rph PF: Power Factor of R phase on mains source.
Yph PF: Power Factor of Y phase on mains source.
Bph PF: Power Factor of B phase on mains source.
Rph kW: Active Power in kW in R-phase.
Yph kW: Active Power in kW in Y-phase.
Bph kW: Active Power in kW in B-phase.
RphkVAR: Reactive Power in kVAr in R-phase.
YphkVAR: Reactive Power in kVAr in Y-phase.
BphkVAR: Reactive Power in kVAr in B-phase.
Rph KVA: Apparent Power in kVA in R-phase.
Yph KVA: Apparent Power in kVA in Y-phase.
Bph KVA: Apparent Power in kVA in B-phase.
RphCKVAR: Capacitor injected reactive power in R-phase.
YphCKVAR: Capacitor injected reactive power in Y-phase.
BphCKVAR: Capacitor injected reactive power in B-phase.
Rph mF: Capacitor value in micro-farad in R-phase.
Yph mF: Capacitor value in micro-farad in Y-phase.
Bph mF: Capacitor value in micro-farad in B-phase.
- 14 -

PAGE: 05

4.Energy
PRESS
PAGE: 05.1

KWH:

1234567.8

PAGE: 05.2

IndKVARH:12345.6
PAGE: 05.3

CapKVARH:12345.6
PAGE: 05.4

KVAH:

1234567.8

PAGE: 05.5

CKVARH:1234567.8

Energy: Submenu:
KWH: Overall cumulative active energy in kWh on Mains supply.
IndKVARH: Inductive reactive energy in kVArh on Mains supply.
CapKVARH: Capacitive reactive energy in kVArh on Mains supply.
KVAH: Overall cumulative apparent energy in kVA on Mains supply.
CKVARH: Capacitor compensated reactive energy in kVArh.

- 15 -

PAGE: 06

5.Harmonics
PRESS
PAGE: 06.1

Vr-THD-F: 002.4%
PAGE: 06.2

Vy-THD-F: 002.4%
PAGE: 06.3

Vb-THD-F: 002.4%
PAGE: 06.4

Ir-THD-F: 012.5%
PAGE: 06.5

Iy-THD-F: 012.5%
PAGE: 06.6

Ib-THD-F: 012.5%
PAGE: 06.7

In-THD-F: 005.0%
PAGE: 06.8

CCr-THD-F:028.2%
PAGE: 06.9

CCy-THD-F:028.2%
PAGE: 06.10

CCb-THD-F:028.2%

Harmonics: Submenu:
Vr-THD-F/R: R-Y line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Vy-THD-F/R: Y-B line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Vb-THD-F/R: B-R line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Ir-THD-F/R: R phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Iy-THD-F/R: Y phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Ib-THD-F/R: B phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
In-THD-F/R: Neutral current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
CCr-THD-F/R: R phase Capacitor current % Total Harmonic Distortion.
CCy-THD-F/R: Y phase Capacitor current % Total Harmonic Distortion.
CCb-THD-F/R: B phase Capacitor current % Total Harmonic Distortion.

- 16 -

PAGE: 07

6.Step KVAR
PRESS
PAGE: 07.1

Stp1 KVAR:0009.0
PAGE: 07.2

Stp2 KVAR:0009.0
PAGE: 07.3

Stp3 KVAR:0009.0
PAGE: 07.4

Stp4 KVAR:0009.0
PAGE: 07.5

Stp5 KVAR:0009.0
PAGE: 07.6

Stp6 KVAR:0009.0

Step KVAR: Submenu:
Stp1 KVAR: Step 1 kVAr value normalized at Capacitor rated voltage.
Stp2 KVAR: Step 2 kVAr value normalized at Capacitor rated voltage.
Stp3 KVAR: Step 3 kVAr value normalized at Capacitor rated voltage.
Stp4 KVAR: Step 4 kVAr value normalized at Capacitor rated voltage.
Stp5 KVAR: Step 5 kVAr value normalized at Capacitor rated voltage.
Stp6 KVAR: Step 6 kVAr value normalized at Capacitor rated voltage.

- 17 -

PAGE: 08

Time: 10:10:00
Real Time Clock: RTC time set in the SPF-25 is displayed here. Its in
HH:MM:SS format.

PAGE: 09

Date: 07:11:06
Real Time Clock: RTC date set in the SPF-25 is displayed here. Its in
dd:mm:yy format.

PAGE: 10

SPF-25 1.0.6

SPF-25 internal firmware version number is displayed here. (Just for user
information)

Total number of Main display pages are 11nos ranging from “00” to
“10”.

- 18 -

Method for Keyboard/Display usage.

Flow chart for entering into different modes:

PRESS
Enable

Default
Display
mode

If Password
Option is
Enable/Disable.

Disable

Enter Pwd: ****
PRESS
Enter the 4
Digit password
By use of
L, R, UP & DN
Keys.

PRESS

NO

IF
PASSWORD
Correct?

*

YES
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

1.Edit Mode

2.Auto Mode

3.Manual Mode

- 19 -

Parameter Editing Submenu Level 1:

*
1.General
2.System
3.Fault
4.Step
5.Communication

Sub-menu
Level 1
for
Parameter
Editing.

Parameter Editing
Sub-Menu
LEVEL 2

1.General and IO: Parameters related with general function and Input/Output
2. System: Electrical system (Mains supply) related parameters.

3. Fault: Setting Faults and fault levels.
4. Step: Capacitor Steps related parameters.
5. Communication: Parameters related with communication and data logging.

- 20 -

Parameter Editing Method:
(For Submenu Level 2 : L2)

Sub-Menu Level 1.
Cursor Blinking
at Parameter Values.

1.Submenu L2: ****

1.Submenu L2: ****
PRESS

key to increment value.

PRESS

Key to decrement value.

PRESS

Key to shift cursor Left.

PRESS

Key to shift cursor Right.
2.Submenu L2: ****

2.Submenu L2: ****
PRESS

key to increment value.

PRESS

Key to decrement value.

PRESS

Key to shift cursor Left.

PRESS

Key to shift cursor Right.

3.Submenu L2: ****

Exit: No Save

Exit: No Save

Without saving

Default
Display.

With saving

Screen for 1second

Saving In EEProm

Exit: With Save

- 21 -

Parameter Editing Submenu Level 2:
Menu
General

Parameter
Pwd
Ch-Pwd
Ld Def
THD
Rst. Energy

Meaning of Parameter
Password Control
Password value
Load all factory default parameters.
Type of THD factor to be displayed
Energy Counters reset to zero option

Default
Enable
1111
No
F-THD
No

Menu
System

Parameter
Meas. Vol.
Ld. Cur. Pr.
Cap. Cur. Pr.
PF Target
PF Target
Auto Sync
Async Tol.
Reset Async

Meaning of Parameter
Default
SPF-25 rated measurement voltage
440
Primary current value of mains CT
0180
0075
Primary current value of capacitor CT
Target PF for deciding Lag or Lead
Lag
1.00
Target PF exact value
Automatic synchronisation requirement Yes
% load variation tolerence for Auto-sync. 30
No
Reset Auto-sync to default value.

Menu
Fault

Parameter
Over Vol.
Over Vol. Lim
Over Vol. Clr
Under Vol.
Under Vol. Lim
Under Vol. Clr
Over Load
Over Ld. Lim
Over Ld. Clr
Under Ld.
Under Ld. Lim
Under Ld. Clr
Ld. Unbalance
Ld. Unb. Lim
Over CC
Over CC. Lim
Over CC. Clr
Over CC. Rst.
Over CC. Rst.
Under CC.
Under CC. Lim
Under CC. CLr
CC THD
CC THD Lim
CC THD Clr
Step Check
Cap. Cur Tol
Under Comp.
RTC Bat

Meaning of Parameter
Default
Over Voltage Fault: action by PDE-30 Off Step
Over Voltage activation limit value
1.10
Over Voltage resumption limit value 1.05
Under Voltage Fault: Action?
Off Step
Under Voltage activation limit value 0.70
Under Voltage resumption limit value 0.75
Over Load Fault: Action?
Indicate
Mains current over load limit value
1.30
Mains cur. over load resume value
1.25
Under Load on Mains: Action?
Indicate
Under load Activation limit value
0.03
Under load Resumption limit value
0.05
Load Un-balance Fault: Action?
Off Step
Load Un-balance limit
025%
Capacitor Over Current Fault: Action? Disable
Cap. Over Current Limit value.
1.30
Cap. Over Current Resume value.
1.25
Auto reset feature on Cap. Over Cur. No
If Over CC. Rst.=Yes. Time for reset. 120 sec
Under Capacitor current fault: Action? Disable
Under Cap. Cur. Limit value.
0.95
Under Cap. Cur. Resume value.
0.97
Capacitor current Over THD: Action? Disable
Cap.Cur. Over THD limit value.
0.10
Cap.Cur. Over THD resume value.
0.08
Every step kVAr healthiness monitor. Disable
Step kVAr healthiness: tolerence.
0.10
Out of Banks Indication.
Disable
RTC Battery fault monitoring.
Enable

- 22 -

Min
Disable
0000
No
R-THD
No
Min
Non
0001
0001
Lead
0.70Lag
No
01
No

Min

Max
Enable
9999
Yes
F-THD
Yes
Max
Edible
9999
9999
Lag
0.85Lead
Yes
50
Yes

Max

Disable, Indicative, Off Step

0.90
0.85

1.20
1.15

Disable, Indicative, Off Step

0.70
0.75

0.95
1.00

Disable, Indicative, Off Step

1.10
1.05

1.30
1.25

Disable, Indicative, Off Step

0.01
0.02

0.20
0.25

Disable, Indicative, Off Step

005%

100%

Disable, Indicative, Off Step

1.05
1.00
No
15

1.50
1.45
Yes
900

Disable, Indicative, Off Step

0.75
0.80

0.98
1.00

Disable, Indicative, Off Step

0.02
0.01
Disable
0.03
Disable
Disable

0.99
0.90
Enable
0.50
Enable
Enable

Menu
Step

Parameter
No. of Steps
Step Vol
Corr. Time
Discharge Time
Step 1 KVAR
Step 2 KVAR
Step 3 KVAR
Step 4 KVAR
Step 5 KVAR
Step 6 KVAR

Meaning of Parameter
Number of Capacitor steps utilised
Voltage at which kVAr is defined
Correction cycle time.
Capacitor discharge time.
Step 1 kVAr value.
Step 2 kVAr value.
Step 3 kVAr value.
Step 4 kVAr value.
Step 5 kVAr value.
Step 6 kVAr value.

Menu
Parameter
Meaning of Parameter
Communication Unit ID
Communication ID of the unit
Baud Rate
Serial communication baud rate.
Time
RTC time to be set
Date
RTC date to be set
Init RTC
Initialise RTC?
Clear NVRAM Clear all contents on NV RAM?

Default
3
440
120 secs
120 secs
006
009
018
018
018
018

Min
1
380
010
010
001
001
001
001
001
001

Default
3001
09600
--No
No

Min
0000
04800
--No
No

Max
6
660
240
240
250
250
250
250
250
250

Max
9999
38400
--Yes
Yes

Note that all the parameters in the Sub-Menu Level 2 should be carefully filled in the
SPF-25. Failing to put the correct parameters can make SPF-25 to malfunction.
Its therefore advised that a trained person should only be allowed to change these
values.

- 23 -

Commissioning Instructions :
before panel is powered up for the first time.
1. Panel Wiring Check
Ensure that all connections in the panel is tightened properly and there are no
loose connections. Also ensure that the wiring is done as per the wiring
diagram.
2. Power Wiring Check
Ensure that the power cables are connected properly from the Panel I/C to the
feeder I/C or the transformer bushings. The connection has to be after the
Load Feed back CT looking from the Transformer side.
Ensure that the Bus Bars and/or Lugs are clean and free of Dust, Corrosion or
Oxidation on the contact sides so that good electrical connection is maintained.
The surface area should be flat so as to get maximum contact area.
If required Clean the Bus Bars and/ or Lugs by rubbing it with Polish Paper to
remove the oxidation layer. Provide contact paste in between the contacts
surfaces.
Not performing this, can result in to a weaker source point for Capacitor
charging during Step on and this can generate undesirable Noise which can
hamper the performance of equipments installed in the capacitor panel.
3. Load Feed Back CT connection.
Ensure that the load feed back CT connections are done properly. Confirm that
correct phase CT is connected with the correct phase input terminals. (Even
though auto sync is capable of taking care of wrong CT polarities or CT
position interchanging, but then on display, the Phase readings may be seen to
be interchanged. (May be R-phase reading would be seen in B-phase and
vice-versa.
CT connections to be done carefully so as to ensure that the wire does not get
open and there is no loose connection.

Loose connection’s or open CT secondary can result in to very high voltages
getting developed in the circuit which can damage the CT and also produce
high levels of noise in the system.

- 24 -

Fault Finding Guidelines :

Fault Type

Probable Reason

Action to Take

Unit Does not
turn ON. No
display on LCD.

•Input auxiliary supply
not coming.
•Input side fuses
blown

•Check the input
supply to restore
•Check fuses in the
unit for OK.

Unit does not
turn On any
capacitors even
if PF is below
Lower PF limit.

•If auto-sync failure
message is there at
Power On.

• Load may be highly
fluctuating so need of
manual
synchronisation only.
• This is OK
condition.

• The load KW is too
low with Under load
fault enable condition.
•Control connections
from SPF-25 to
contactor coils are not
proper

•Check control supply
and connections from
SPF-25 to contactors.

BF indication on
Default display.

• Internal Ni-Cd
3.2Vdc battery used
for RTC and NV RAM
must be drained down.

• Replace this battery
in consultancy with
TAS trained
personnel.

Some Capacitor
banks are
declared as
faulty even if
they are
checked to be
OK.

•Individual step health
monitoring is enabled
and tolerance limits
set are too stringent.
• Capacitor current
THD factor is
continuously
fluctuating.

•Set the tolerance
limits for individual
steps monitoring as
relaxed.
• With continuously
fluctuating THD of
Capacitor current and
higher level of THD
can cause some
errors in individual
step KVAR
measurement. Under
this condition, best is
to keep this feature
disabled.

- 25 -

Fault Finding Guidelines (continued):

Fault Type

Probable Reason

Action to Take

Serial
Communication
is not working.

• Baud rate selection
is not proper.
• Unit ID is not set
properly.
• Serial
communication cable
connections are not
proper.

• Select proper baud
rate.
• Set the unit ID
correctly.
• Check the serial
cable continuity as
per the connections
given earlier in this
manual.

Data logging is
not taking place.

• Possible that RTC
date is not set
properly.

• Change the battery
by help of TAS’s
authorised person.

SPF-25 resets
occasionally on
turning OFF of
any contactor.

• The contactor supply
phase may be the
same as used for SPF25 auxiliary supply.
• RC snubbers/ free
wheeling diodes are
not put with contactor
coils.

• Use the different
phase for control
supply of contactors
and for SPF-25 supply
• Usage of RC
snubbers / free
wheeling diodes is
mandatory.

- 26 -

Corporate Office/Works/Design Centre:
W-61, MIDC, Ambad, Nasik - 422010, Maharashtra (India)
Tel: +91-(253)-2384038 / 2381090
Email: [email protected]
Marketing and After-Sales Service:
A/58, Kamal Pushpa, K.C. Road, Bandra, Mumbai-400050.
Tel: +91-9930513923
Email: [email protected]
Regional Office: Delhi
191-B, Ground Floor, Padam Nagar (Filter Market),
New Delhi - 110007 (India).
Tel: +91-9911615701
Email: [email protected]


Slide 13

Operations Manual
SPF-25/6
AUTOMATIC POWER FACTOR
CONTROLLER

TAS Powertek Pvt. Ltd.
Corporate Office:
W-61, MIDC, Ambad, Nasik - 422010, Maharashtra (India)
Tel: +91-(253)-2384038 / 2381090
Email: [email protected]

NOTE
These instructions do not purport to cover all details or
variations in equipment, nor to provide for every possible
contingency to be met in connection with installation,
operation or maintenance.

Should further information be desired or should particular
problems arise which are not covered sufficiently for the
purchasers purposes, the matter should be referred to our
TAS Powertek Pvt. Ltd., office.
The contents of this instruction Manual shall not become
part of or modify any prior or existing agreement or
relationship. The sales contract contains the entire
obligations of TAS Powertek Pvt. Ltd. The warranty
contained in the contract between the parties is the sole
warranty of TAS Powertek Pvt. Ltd. Any statements
contained herein do not create new warranties or modify the
existing warranty.

The reproduction, transmission or use of this
document or its contents is not permitted
without express written authority. Offenders
will be liable for damages. All rights are
reserved.

Index
Index Page
-----------------Features & Specifications
----------Mechanical Dimensions/ mounting --------Functional Block diagram
-----------------PF correction technique
-----------------Back Side terminals
-----------------------Typical wiring scheme ---------------------Front Facia
---------------------------------Communication connector connections ----Display of various parameters / Status ---Method of Keyboard/Display usage -------Parameter Submenu -----------------------Commissioning Instruction (before Powerup)
Fault finding Guidelines ---------------------

-1-

1
2
3
4
5
6
7
8
9
10
19
22
24
25

Features:
• Totally Micro-processor controlled Digital Signal processing
logic for measurements.
• All measurements with 1.0 class accuracy.
• Automatic Synchronisation capable of giving the correct
results for wrong connections at CT terminals (even wrong
polarity of CTs).
• Measurement and kVAr compensation are frequency / THD
compensated.
• Load V,Iph, In and Cap. current THD measurement.
• Up-to 6 output banks control.
• Capable of doing the kVAr measurements on basis of mean
of the correction cycle time and provide kVAr compensation.
• Standard 144 X 144 cabinet for panel door flush mounting.
• Serial communication through standard TAS protocols.
• Manual testing mode for user checking of the Capacitor steps
switching.
• Protections provided (user settable):
Over/under Voltage
Cap. Over/under current / THD.
Over/Under frequency (internally set limits)
Over / Under load.
Load unbalance.
Capacitor individual step kVAr monitoring.
Out of steps: Under-compensation (only for indication)
NV-RAM battery down.
• Data logging for various parameters for 2months period at an
interval of 1hr.
• Unit comes along with PC (Windows compatible) software
for downloading and viewing the logged data.

Specifications:
•
•
•
•
•
•
•
•
•
•
•
•

Feed-back Voltage:440Volt (+10%/-30%)
Current input : 1Amp for load and capacitor feed-back.
Measurement Accuracy: Class 1.0
Auxiliary Supply: 525Vac to 300Vac.
Correction / Discharge time:
Selectable in seconds from 10sec. to 240sec.
Output commands:
NO contacts each with current rating of 0.5Amp AC. at
240Vac.
RS-232 baud rate selectable from 4.8kBPS to 38.4kBPS.
Operating temperature: 0 to 55oC.
1.0class measurement Operating temperature: 0 to 50oC.
Storage temperature: -10 to +75oC.
Humidity: 0 to 98%.
Supply frequency: 45Hz to 55Hz.

-2-

Mechanical Dimensions:
135

144

135

120
144

6

Recommended size for cutout on panel door is 138 X 138.
All Dimensions given are in mm.

Maximum weight: (with clamps and terminals) = 2.5kg.

-3-

Functional Block Diagram:
3 channel
Current f.b.

3
Channel
Cap.
Current
f.b.

3 channel
Voltage f.b.

SPF-25

V, I, PF and Power
Measurement
Block
For every AC mains
Cycle.

Calculation
Block for
• Energy Parameters
• Harmonic analysis

EEPROM
For Data
Logging

Keyboard,
Display and
Other support
Functions
Block.

RS-232 Serial
Communication.
TAS-01
Protocol stack.

Power Factor
Correction Block
+ event monitoring.

Outputs Commands
For Capacitor
Switching.

Power Supply
Block.

Above block diagram gives the functional blocks that are built into SPF-25 PF
correction relay.
These blocks are made up with the combination of functions from hardware and
corresponding firmware that resides in the Program memory of the micro-processor
used therein.
Even though the basic blocks exists as shown in the diagram, there functionality is
interdependent. The entire combination is carefully designed so as to have
minimum effects of Electrical and Electromagnetic noise level on the functionality of
this SPF-25.
The firmware written takes into various error handling eventualities so that the
functioning of this PF relay is error free and highly reliable.

-4-

PF correction technique:
KVAr Inductive

Target
PF.
Cos Φ
= PF

1.5 X kVAr
Of Smallest
Capacitor bank

KW

No change band.
KVAr Capacitive
Capacitor Addition band.
Capacitor Removal band.
SPF-25 for kVAr compensation works with the kW v/s kVAr diagram as shown here
above.
A band is created across the target PF value. (Target PF is set by user). This band
is of +0.75 of the smallest capacitor bank kVAr. Thus, total band width is always 1.5
times the smallest capacitor bank kVAr used. This is a no change band. If the
mains source parameters are within this band, SPF-25 would not change the
capacitors bank status.
If the mains parameters are out of this “No change band”, then SPF-25 calculates
the correct capacitor bank combination to be added / subtracted and within one
correction cycle brings it within the No change band.
The no change band width is selected as mentioned because it has to prevent unnecessary hunting (switching on/off) of the capacitor banks.

-5-

Back Side terminals:

Voltage
Feed-Back

Auxiliary
Supply

Current
Feed-Back
Output commands.

-6-

Capacitor
Current
Feed-Back

Typical Wiring with SPF-25 PF correction system.
L
O
A
D

L
C
R
+

L
C
R
-

L
C
Y
+

L
C
Y
-

L
C
B
+

L
C
B
-

PH 3
PH 2
PH 1
CCR+
CCRCCY+
CCYCCB+
CCB-

S
P
F
2
5

Auxiliary
Supply

L1
L2

Com
C01
C02
|

C06

Mains Connections:
Phase 1 control:
Neutral control:
Commands:
Load Current CT:
Capacitor Current CT:

-7-

Front Facia of SPF-25:
LCD Display

Step status LED indication
Serial Communication Port

Membrane Keypad

Usage of the UP and DN key makes the LCD display to scroll up
and down. This is used for display of various status as well as for
viewing the On line measured electrical values.
These keys are also used for changing values in Parameters
Editing mode and used for status changing of banks in Manual
mode.
Usage of ENT key is for entering the submenu and / or for setting
up some values.
The L and R keys are used in changing the position of the cursor
from Left to Right and vice-versa.

-8-

RS-232 serial communication 9 pin D connector:

5

4

6

3

7

2

8

1

9
RXD

GND

TXD

RS-232 cable connection Details:

PIN
NO

PC side
Connection

CONNECTION

SPF-25

1

NC

2

RXD

TXD

3

TXD

RXD

GND

GND

4
5
6
7
8
9

NC

-9-

Display of Various Parameters / Status:
PAGE: 00

COSΦ= -0.99 A OK

This is default display screen giving
information on PF, mode and
working status.

COSΦ= -0.99 :This part of the display indicates the Power Factor running value. The
sign –ve indicates that PF is Capacitive and no sign (+ve) indicates that PF is Inductive.
The PF indicated is the overall PF of the three phase system.
A or M :
This part either indicates the letter “A” or letter “M”. The letter A means
that SPF-25 is working in Auto mode.
The letter M means that SPF-25 is presently in Manual mode.
The Auto or Manual modes can be selected by pressing ENT key on this page.
(If Password option is enabled, enter the same by using UP/DN/L/R keys and then
Pressing ENT)
Then by UP or DN key you can stroll between the displays:
“1. Edit Mode”, “2. Auto Mode”, “3.Manual Mode”.
The first one “1.Edit Mode” is for parameter changing. The details of parameter changing
are explained in detail in later part of this manual.
The second and third one as display indicates are for selecting Auto or Manual mode
respectively. The ENT key pressed on selecting the mode desired, puts the SPF-25 into
that mode.
Auto Mode: In this mode SPF-25 works in automatic mode. It switches the capacitor
banks automatically depending on the parameter setting of target PF. This mode is the
default mode and is to be used for unmanned operation of the system controlled by
SPF-25.
Manual Mode: This mode is activated for checking/testing the capacitor banks switching.
Its also used for changing the Masking status of the capacitor banks. More on this is
explained later. (On Page 01 explanation)
OK or ** :
The last part of the display that is blinking every 500mS indicates the
working status of SPF-25. “OK” indicates that unit is working fine without any trip
conditions. If there is other indication, the meaning of the same can be as:
OK
:
No Fault
OC
:
Over Capacitor Current
UC
:
Under Capacitor Current
OL
:
Over Load
UL
:
Under Load
OV
:
Over Voltage
UV
:
Under Voltage
OF
:
Over Frequency
UF
:
Under Frequency
OH
:
Over Capacitor Current THD %.
OB
:
Out of Banks
LU
:
Load Unbalance
BF
:
Battery Failure (RTC)
NV
:
NVRAM Checksum Error
VA
:
Voltage Absent
- 10 -

PAGE: 01

PAGE: 01

______

AUTO

______

MAN

This display indicates the Bank status in Auto mode and in Manual mode it helps
to make the specific bank On or Off or declare masked.
: Means Bank is On.
: Means Bank is Off.
: Means Bank is Off and is declared masked (out of action)
: Means Bank does not exist for compensation.
When the Page 01 is in Auto mode, its only for indication of Bank status.
But in Manual mode, the “ENT” key press activates the manual control
mode. The cursor over the bank number starts blinking. The UP and DN
keys can turn On and Off the respective bank.
The DN key pressed puts the respective bank in Masking mode and another
press of DN key brings it out of Masking mode.

Putting the bank masking status permanently:
If a bank is to be permanently put in masked mode or is to be brought out of
permanent masked mode, it can be done by bringing the blinking cursor on
the position of the respective bank by use of L or R key. Then by pressing
DN key, bring the status of the bank to the required level (Masked or
Unmasked). Then press ENT key so that cursor stops blinking. After that by
pressing UP key go to Page 00. Then Press ENT. (If Password option is
enabled, enter the same by using UP/DN/L/R keys and then Press ENT)
“1.EDIT MODE” would be displayed. Press ENT one more time. “1.General
and IO” would be displayed. Press ENT again. “Pwd : Disable” or “Pwd :
Enable” would be displayed. Press UP key. “Exit: No Save” would be
displayed. Press ENT so that cursor will start blinking. Press UP. “Exit: With
Save” would be displayed with cursor blinking. Press ENT. “Saving in
EEPROM” would be displayed for a short time and then Page 00 would be
displayed.
You will observe that the bank status as requirement is changed
permanently to the status desired.

- 11 -

PAGE: 02

1.Overall Values
PRESS
PAGE: 02.1

Avg Vol: 415.7 V
PAGE: 02.2

Avg Cur: 0123.4A
PAGE: 02.3

Tot KW:

0081.2

PAGE: 02.4

TotKVAR: 0024.6
PAGE: 02.5

Tot KVA: 0101.1
PAGE: 02.6

Avg CC:

0031.3A

PAGE: 02.7

CKVAR:

028.35

PAGE: 02.8

LS PF:

0.82

PAGE: 02.9

LS KVAR: 0043.9
PAGE: 02.10

LS KVA:

0125.7

PAGE: 02.11

Freq:

49.9Hz

The Overall values Display menu has submenus as displayed above. As its
self explanatory it means:
Avg Vol: Average voltage of all the three line to line voltage values.
Avg Cur: Average current of all the three phase line current values.
Tot KW: Overall kW of the three phase system measured at source.
TotKVAR: Overall kVAr of the three phase system measured at source.
Tot KVA: Overall kVA of the three phase system measured at source.
Avg CC: Average of three phase current through capacitor panel.
CKVAR: Capacitive kVAr that is compensated by the system.
LS PF: Load side PF. (PF value if not compensated.
LS KVAR: Load side kVAr.
LS KVA: Load side kVA.
Freq: Supply frequency in Hz.
- 12 -

PAGE: 03

2.Per-Phase RMS

PRESS
PAGE: 03.1

R-Y Vol: 415.7 V
PAGE: 03.2

Y-B Vol: 415.7 V
PAGE: 03.3

B-R Vol: 415.7 V
PAGE: 03.4

Rph Cur: 0110.8A
PAGE: 03.5

Yph Cur: 0110.8A
PAGE: 03.6

Bph Cur: 0110.8A
PAGE: 03.7

Neutral: 0010.2A
PAGE: 03.8

Rph Cap: 0022.5A
PAGE: 03.9

Yph Cap: 0022.5A
PAGE: 03.10

Bph Cap: 0022.5A

Per Phase RMS: Submenu:
R-Y Vol: Measured AC Voltage RMS value across R and Y phase.
Y-B Vol: Measured AC Voltage RMS value across Y and B phase.
B-R Vol: Measured AC Voltage RMS value across B and R phase.
Rph Cur: Line current RMS value in R phase. Mains source.
Yph Cur: Line current RMS value in Y phase. Mains source.
Bph Cur: Line current RMS value in B phase. Mains source.
Neutral: Neutral current RMS value.
Rph Cap: Capacitor current RMS value in R phase.
Yph Cap: Capacitor current RMS value in Y phase.
Bph Cap: Capacitor current RMS value in B phase.

- 13 -

PAGE: 04

3.Power
PRESS
PAGE: 04.1

Rph PF:

PAGE: 04.10

1.00

Rph KVA: 0109.7

PAGE: 04.2

Yph PF:

PAGE: 04.11

1.00

Yph KVA: 0109.7

PAGE: 04.3

Bph PF:

PAGE: 04.12

1.00

Bph KVA: 0109.7

PAGE: 04.4

Rph KW:

PAGE: 04.13

0100.2

RphCKVAR: 010.76

PAGE: 04.5

Yph KW:

PAGE: 04.14

0100.2

YphCKVAR: 010.76

PAGE: 04.6

Bph KW:

PAGE: 04.15

0100.2

BphCKVAR: 010.76

PAGE: 04.7

PAGE: 04.16

RphKVAR: 0020.4

Rph mF

PAGE: 04.8

: 165.06

PAGE: 04.17

YphKVAR: 0020.4

Yph mF

PAGE: 04.9

: 165.06

PAGE: 04.18

BphKVAR: 0020.4

Bph mF

: 165.06

Power: Submenu:
Rph PF: Power Factor of R phase on mains source.
Yph PF: Power Factor of Y phase on mains source.
Bph PF: Power Factor of B phase on mains source.
Rph kW: Active Power in kW in R-phase.
Yph kW: Active Power in kW in Y-phase.
Bph kW: Active Power in kW in B-phase.
RphkVAR: Reactive Power in kVAr in R-phase.
YphkVAR: Reactive Power in kVAr in Y-phase.
BphkVAR: Reactive Power in kVAr in B-phase.
Rph KVA: Apparent Power in kVA in R-phase.
Yph KVA: Apparent Power in kVA in Y-phase.
Bph KVA: Apparent Power in kVA in B-phase.
RphCKVAR: Capacitor injected reactive power in R-phase.
YphCKVAR: Capacitor injected reactive power in Y-phase.
BphCKVAR: Capacitor injected reactive power in B-phase.
Rph mF: Capacitor value in micro-farad in R-phase.
Yph mF: Capacitor value in micro-farad in Y-phase.
Bph mF: Capacitor value in micro-farad in B-phase.
- 14 -

PAGE: 05

4.Energy
PRESS
PAGE: 05.1

KWH:

1234567.8

PAGE: 05.2

IndKVARH:12345.6
PAGE: 05.3

CapKVARH:12345.6
PAGE: 05.4

KVAH:

1234567.8

PAGE: 05.5

CKVARH:1234567.8

Energy: Submenu:
KWH: Overall cumulative active energy in kWh on Mains supply.
IndKVARH: Inductive reactive energy in kVArh on Mains supply.
CapKVARH: Capacitive reactive energy in kVArh on Mains supply.
KVAH: Overall cumulative apparent energy in kVA on Mains supply.
CKVARH: Capacitor compensated reactive energy in kVArh.

- 15 -

PAGE: 06

5.Harmonics
PRESS
PAGE: 06.1

Vr-THD-F: 002.4%
PAGE: 06.2

Vy-THD-F: 002.4%
PAGE: 06.3

Vb-THD-F: 002.4%
PAGE: 06.4

Ir-THD-F: 012.5%
PAGE: 06.5

Iy-THD-F: 012.5%
PAGE: 06.6

Ib-THD-F: 012.5%
PAGE: 06.7

In-THD-F: 005.0%
PAGE: 06.8

CCr-THD-F:028.2%
PAGE: 06.9

CCy-THD-F:028.2%
PAGE: 06.10

CCb-THD-F:028.2%

Harmonics: Submenu:
Vr-THD-F/R: R-Y line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Vy-THD-F/R: Y-B line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Vb-THD-F/R: B-R line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Ir-THD-F/R: R phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Iy-THD-F/R: Y phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Ib-THD-F/R: B phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
In-THD-F/R: Neutral current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
CCr-THD-F/R: R phase Capacitor current % Total Harmonic Distortion.
CCy-THD-F/R: Y phase Capacitor current % Total Harmonic Distortion.
CCb-THD-F/R: B phase Capacitor current % Total Harmonic Distortion.

- 16 -

PAGE: 07

6.Step KVAR
PRESS
PAGE: 07.1

Stp1 KVAR:0009.0
PAGE: 07.2

Stp2 KVAR:0009.0
PAGE: 07.3

Stp3 KVAR:0009.0
PAGE: 07.4

Stp4 KVAR:0009.0
PAGE: 07.5

Stp5 KVAR:0009.0
PAGE: 07.6

Stp6 KVAR:0009.0

Step KVAR: Submenu:
Stp1 KVAR: Step 1 kVAr value normalized at Capacitor rated voltage.
Stp2 KVAR: Step 2 kVAr value normalized at Capacitor rated voltage.
Stp3 KVAR: Step 3 kVAr value normalized at Capacitor rated voltage.
Stp4 KVAR: Step 4 kVAr value normalized at Capacitor rated voltage.
Stp5 KVAR: Step 5 kVAr value normalized at Capacitor rated voltage.
Stp6 KVAR: Step 6 kVAr value normalized at Capacitor rated voltage.

- 17 -

PAGE: 08

Time: 10:10:00
Real Time Clock: RTC time set in the SPF-25 is displayed here. Its in
HH:MM:SS format.

PAGE: 09

Date: 07:11:06
Real Time Clock: RTC date set in the SPF-25 is displayed here. Its in
dd:mm:yy format.

PAGE: 10

SPF-25 1.0.6

SPF-25 internal firmware version number is displayed here. (Just for user
information)

Total number of Main display pages are 11nos ranging from “00” to
“10”.

- 18 -

Method for Keyboard/Display usage.

Flow chart for entering into different modes:

PRESS
Enable

Default
Display
mode

If Password
Option is
Enable/Disable.

Disable

Enter Pwd: ****
PRESS
Enter the 4
Digit password
By use of
L, R, UP & DN
Keys.

PRESS

NO

IF
PASSWORD
Correct?

*

YES
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

1.Edit Mode

2.Auto Mode

3.Manual Mode

- 19 -

Parameter Editing Submenu Level 1:

*
1.General
2.System
3.Fault
4.Step
5.Communication

Sub-menu
Level 1
for
Parameter
Editing.

Parameter Editing
Sub-Menu
LEVEL 2

1.General and IO: Parameters related with general function and Input/Output
2. System: Electrical system (Mains supply) related parameters.

3. Fault: Setting Faults and fault levels.
4. Step: Capacitor Steps related parameters.
5. Communication: Parameters related with communication and data logging.

- 20 -

Parameter Editing Method:
(For Submenu Level 2 : L2)

Sub-Menu Level 1.
Cursor Blinking
at Parameter Values.

1.Submenu L2: ****

1.Submenu L2: ****
PRESS

key to increment value.

PRESS

Key to decrement value.

PRESS

Key to shift cursor Left.

PRESS

Key to shift cursor Right.
2.Submenu L2: ****

2.Submenu L2: ****
PRESS

key to increment value.

PRESS

Key to decrement value.

PRESS

Key to shift cursor Left.

PRESS

Key to shift cursor Right.

3.Submenu L2: ****

Exit: No Save

Exit: No Save

Without saving

Default
Display.

With saving

Screen for 1second

Saving In EEProm

Exit: With Save

- 21 -

Parameter Editing Submenu Level 2:
Menu
General

Parameter
Pwd
Ch-Pwd
Ld Def
THD
Rst. Energy

Meaning of Parameter
Password Control
Password value
Load all factory default parameters.
Type of THD factor to be displayed
Energy Counters reset to zero option

Default
Enable
1111
No
F-THD
No

Menu
System

Parameter
Meas. Vol.
Ld. Cur. Pr.
Cap. Cur. Pr.
PF Target
PF Target
Auto Sync
Async Tol.
Reset Async

Meaning of Parameter
Default
SPF-25 rated measurement voltage
440
Primary current value of mains CT
0180
0075
Primary current value of capacitor CT
Target PF for deciding Lag or Lead
Lag
1.00
Target PF exact value
Automatic synchronisation requirement Yes
% load variation tolerence for Auto-sync. 30
No
Reset Auto-sync to default value.

Menu
Fault

Parameter
Over Vol.
Over Vol. Lim
Over Vol. Clr
Under Vol.
Under Vol. Lim
Under Vol. Clr
Over Load
Over Ld. Lim
Over Ld. Clr
Under Ld.
Under Ld. Lim
Under Ld. Clr
Ld. Unbalance
Ld. Unb. Lim
Over CC
Over CC. Lim
Over CC. Clr
Over CC. Rst.
Over CC. Rst.
Under CC.
Under CC. Lim
Under CC. CLr
CC THD
CC THD Lim
CC THD Clr
Step Check
Cap. Cur Tol
Under Comp.
RTC Bat

Meaning of Parameter
Default
Over Voltage Fault: action by PDE-30 Off Step
Over Voltage activation limit value
1.10
Over Voltage resumption limit value 1.05
Under Voltage Fault: Action?
Off Step
Under Voltage activation limit value 0.70
Under Voltage resumption limit value 0.75
Over Load Fault: Action?
Indicate
Mains current over load limit value
1.30
Mains cur. over load resume value
1.25
Under Load on Mains: Action?
Indicate
Under load Activation limit value
0.03
Under load Resumption limit value
0.05
Load Un-balance Fault: Action?
Off Step
Load Un-balance limit
025%
Capacitor Over Current Fault: Action? Disable
Cap. Over Current Limit value.
1.30
Cap. Over Current Resume value.
1.25
Auto reset feature on Cap. Over Cur. No
If Over CC. Rst.=Yes. Time for reset. 120 sec
Under Capacitor current fault: Action? Disable
Under Cap. Cur. Limit value.
0.95
Under Cap. Cur. Resume value.
0.97
Capacitor current Over THD: Action? Disable
Cap.Cur. Over THD limit value.
0.10
Cap.Cur. Over THD resume value.
0.08
Every step kVAr healthiness monitor. Disable
Step kVAr healthiness: tolerence.
0.10
Out of Banks Indication.
Disable
RTC Battery fault monitoring.
Enable

- 22 -

Min
Disable
0000
No
R-THD
No
Min
Non
0001
0001
Lead
0.70Lag
No
01
No

Min

Max
Enable
9999
Yes
F-THD
Yes
Max
Edible
9999
9999
Lag
0.85Lead
Yes
50
Yes

Max

Disable, Indicative, Off Step

0.90
0.85

1.20
1.15

Disable, Indicative, Off Step

0.70
0.75

0.95
1.00

Disable, Indicative, Off Step

1.10
1.05

1.30
1.25

Disable, Indicative, Off Step

0.01
0.02

0.20
0.25

Disable, Indicative, Off Step

005%

100%

Disable, Indicative, Off Step

1.05
1.00
No
15

1.50
1.45
Yes
900

Disable, Indicative, Off Step

0.75
0.80

0.98
1.00

Disable, Indicative, Off Step

0.02
0.01
Disable
0.03
Disable
Disable

0.99
0.90
Enable
0.50
Enable
Enable

Menu
Step

Parameter
No. of Steps
Step Vol
Corr. Time
Discharge Time
Step 1 KVAR
Step 2 KVAR
Step 3 KVAR
Step 4 KVAR
Step 5 KVAR
Step 6 KVAR

Meaning of Parameter
Number of Capacitor steps utilised
Voltage at which kVAr is defined
Correction cycle time.
Capacitor discharge time.
Step 1 kVAr value.
Step 2 kVAr value.
Step 3 kVAr value.
Step 4 kVAr value.
Step 5 kVAr value.
Step 6 kVAr value.

Menu
Parameter
Meaning of Parameter
Communication Unit ID
Communication ID of the unit
Baud Rate
Serial communication baud rate.
Time
RTC time to be set
Date
RTC date to be set
Init RTC
Initialise RTC?
Clear NVRAM Clear all contents on NV RAM?

Default
3
440
120 secs
120 secs
006
009
018
018
018
018

Min
1
380
010
010
001
001
001
001
001
001

Default
3001
09600
--No
No

Min
0000
04800
--No
No

Max
6
660
240
240
250
250
250
250
250
250

Max
9999
38400
--Yes
Yes

Note that all the parameters in the Sub-Menu Level 2 should be carefully filled in the
SPF-25. Failing to put the correct parameters can make SPF-25 to malfunction.
Its therefore advised that a trained person should only be allowed to change these
values.

- 23 -

Commissioning Instructions :
before panel is powered up for the first time.
1. Panel Wiring Check
Ensure that all connections in the panel is tightened properly and there are no
loose connections. Also ensure that the wiring is done as per the wiring
diagram.
2. Power Wiring Check
Ensure that the power cables are connected properly from the Panel I/C to the
feeder I/C or the transformer bushings. The connection has to be after the
Load Feed back CT looking from the Transformer side.
Ensure that the Bus Bars and/or Lugs are clean and free of Dust, Corrosion or
Oxidation on the contact sides so that good electrical connection is maintained.
The surface area should be flat so as to get maximum contact area.
If required Clean the Bus Bars and/ or Lugs by rubbing it with Polish Paper to
remove the oxidation layer. Provide contact paste in between the contacts
surfaces.
Not performing this, can result in to a weaker source point for Capacitor
charging during Step on and this can generate undesirable Noise which can
hamper the performance of equipments installed in the capacitor panel.
3. Load Feed Back CT connection.
Ensure that the load feed back CT connections are done properly. Confirm that
correct phase CT is connected with the correct phase input terminals. (Even
though auto sync is capable of taking care of wrong CT polarities or CT
position interchanging, but then on display, the Phase readings may be seen to
be interchanged. (May be R-phase reading would be seen in B-phase and
vice-versa.
CT connections to be done carefully so as to ensure that the wire does not get
open and there is no loose connection.

Loose connection’s or open CT secondary can result in to very high voltages
getting developed in the circuit which can damage the CT and also produce
high levels of noise in the system.

- 24 -

Fault Finding Guidelines :

Fault Type

Probable Reason

Action to Take

Unit Does not
turn ON. No
display on LCD.

•Input auxiliary supply
not coming.
•Input side fuses
blown

•Check the input
supply to restore
•Check fuses in the
unit for OK.

Unit does not
turn On any
capacitors even
if PF is below
Lower PF limit.

•If auto-sync failure
message is there at
Power On.

• Load may be highly
fluctuating so need of
manual
synchronisation only.
• This is OK
condition.

• The load KW is too
low with Under load
fault enable condition.
•Control connections
from SPF-25 to
contactor coils are not
proper

•Check control supply
and connections from
SPF-25 to contactors.

BF indication on
Default display.

• Internal Ni-Cd
3.2Vdc battery used
for RTC and NV RAM
must be drained down.

• Replace this battery
in consultancy with
TAS trained
personnel.

Some Capacitor
banks are
declared as
faulty even if
they are
checked to be
OK.

•Individual step health
monitoring is enabled
and tolerance limits
set are too stringent.
• Capacitor current
THD factor is
continuously
fluctuating.

•Set the tolerance
limits for individual
steps monitoring as
relaxed.
• With continuously
fluctuating THD of
Capacitor current and
higher level of THD
can cause some
errors in individual
step KVAR
measurement. Under
this condition, best is
to keep this feature
disabled.

- 25 -

Fault Finding Guidelines (continued):

Fault Type

Probable Reason

Action to Take

Serial
Communication
is not working.

• Baud rate selection
is not proper.
• Unit ID is not set
properly.
• Serial
communication cable
connections are not
proper.

• Select proper baud
rate.
• Set the unit ID
correctly.
• Check the serial
cable continuity as
per the connections
given earlier in this
manual.

Data logging is
not taking place.

• Possible that RTC
date is not set
properly.

• Change the battery
by help of TAS’s
authorised person.

SPF-25 resets
occasionally on
turning OFF of
any contactor.

• The contactor supply
phase may be the
same as used for SPF25 auxiliary supply.
• RC snubbers/ free
wheeling diodes are
not put with contactor
coils.

• Use the different
phase for control
supply of contactors
and for SPF-25 supply
• Usage of RC
snubbers / free
wheeling diodes is
mandatory.

- 26 -

Corporate Office/Works/Design Centre:
W-61, MIDC, Ambad, Nasik - 422010, Maharashtra (India)
Tel: +91-(253)-2384038 / 2381090
Email: [email protected]
Marketing and After-Sales Service:
A/58, Kamal Pushpa, K.C. Road, Bandra, Mumbai-400050.
Tel: +91-9930513923
Email: [email protected]
Regional Office: Delhi
191-B, Ground Floor, Padam Nagar (Filter Market),
New Delhi - 110007 (India).
Tel: +91-9911615701
Email: [email protected]


Slide 14

Operations Manual
SPF-25/6
AUTOMATIC POWER FACTOR
CONTROLLER

TAS Powertek Pvt. Ltd.
Corporate Office:
W-61, MIDC, Ambad, Nasik - 422010, Maharashtra (India)
Tel: +91-(253)-2384038 / 2381090
Email: [email protected]

NOTE
These instructions do not purport to cover all details or
variations in equipment, nor to provide for every possible
contingency to be met in connection with installation,
operation or maintenance.

Should further information be desired or should particular
problems arise which are not covered sufficiently for the
purchasers purposes, the matter should be referred to our
TAS Powertek Pvt. Ltd., office.
The contents of this instruction Manual shall not become
part of or modify any prior or existing agreement or
relationship. The sales contract contains the entire
obligations of TAS Powertek Pvt. Ltd. The warranty
contained in the contract between the parties is the sole
warranty of TAS Powertek Pvt. Ltd. Any statements
contained herein do not create new warranties or modify the
existing warranty.

The reproduction, transmission or use of this
document or its contents is not permitted
without express written authority. Offenders
will be liable for damages. All rights are
reserved.

Index
Index Page
-----------------Features & Specifications
----------Mechanical Dimensions/ mounting --------Functional Block diagram
-----------------PF correction technique
-----------------Back Side terminals
-----------------------Typical wiring scheme ---------------------Front Facia
---------------------------------Communication connector connections ----Display of various parameters / Status ---Method of Keyboard/Display usage -------Parameter Submenu -----------------------Commissioning Instruction (before Powerup)
Fault finding Guidelines ---------------------

-1-

1
2
3
4
5
6
7
8
9
10
19
22
24
25

Features:
• Totally Micro-processor controlled Digital Signal processing
logic for measurements.
• All measurements with 1.0 class accuracy.
• Automatic Synchronisation capable of giving the correct
results for wrong connections at CT terminals (even wrong
polarity of CTs).
• Measurement and kVAr compensation are frequency / THD
compensated.
• Load V,Iph, In and Cap. current THD measurement.
• Up-to 6 output banks control.
• Capable of doing the kVAr measurements on basis of mean
of the correction cycle time and provide kVAr compensation.
• Standard 144 X 144 cabinet for panel door flush mounting.
• Serial communication through standard TAS protocols.
• Manual testing mode for user checking of the Capacitor steps
switching.
• Protections provided (user settable):
Over/under Voltage
Cap. Over/under current / THD.
Over/Under frequency (internally set limits)
Over / Under load.
Load unbalance.
Capacitor individual step kVAr monitoring.
Out of steps: Under-compensation (only for indication)
NV-RAM battery down.
• Data logging for various parameters for 2months period at an
interval of 1hr.
• Unit comes along with PC (Windows compatible) software
for downloading and viewing the logged data.

Specifications:
•
•
•
•
•
•
•
•
•
•
•
•

Feed-back Voltage:440Volt (+10%/-30%)
Current input : 1Amp for load and capacitor feed-back.
Measurement Accuracy: Class 1.0
Auxiliary Supply: 525Vac to 300Vac.
Correction / Discharge time:
Selectable in seconds from 10sec. to 240sec.
Output commands:
NO contacts each with current rating of 0.5Amp AC. at
240Vac.
RS-232 baud rate selectable from 4.8kBPS to 38.4kBPS.
Operating temperature: 0 to 55oC.
1.0class measurement Operating temperature: 0 to 50oC.
Storage temperature: -10 to +75oC.
Humidity: 0 to 98%.
Supply frequency: 45Hz to 55Hz.

-2-

Mechanical Dimensions:
135

144

135

120
144

6

Recommended size for cutout on panel door is 138 X 138.
All Dimensions given are in mm.

Maximum weight: (with clamps and terminals) = 2.5kg.

-3-

Functional Block Diagram:
3 channel
Current f.b.

3
Channel
Cap.
Current
f.b.

3 channel
Voltage f.b.

SPF-25

V, I, PF and Power
Measurement
Block
For every AC mains
Cycle.

Calculation
Block for
• Energy Parameters
• Harmonic analysis

EEPROM
For Data
Logging

Keyboard,
Display and
Other support
Functions
Block.

RS-232 Serial
Communication.
TAS-01
Protocol stack.

Power Factor
Correction Block
+ event monitoring.

Outputs Commands
For Capacitor
Switching.

Power Supply
Block.

Above block diagram gives the functional blocks that are built into SPF-25 PF
correction relay.
These blocks are made up with the combination of functions from hardware and
corresponding firmware that resides in the Program memory of the micro-processor
used therein.
Even though the basic blocks exists as shown in the diagram, there functionality is
interdependent. The entire combination is carefully designed so as to have
minimum effects of Electrical and Electromagnetic noise level on the functionality of
this SPF-25.
The firmware written takes into various error handling eventualities so that the
functioning of this PF relay is error free and highly reliable.

-4-

PF correction technique:
KVAr Inductive

Target
PF.
Cos Φ
= PF

1.5 X kVAr
Of Smallest
Capacitor bank

KW

No change band.
KVAr Capacitive
Capacitor Addition band.
Capacitor Removal band.
SPF-25 for kVAr compensation works with the kW v/s kVAr diagram as shown here
above.
A band is created across the target PF value. (Target PF is set by user). This band
is of +0.75 of the smallest capacitor bank kVAr. Thus, total band width is always 1.5
times the smallest capacitor bank kVAr used. This is a no change band. If the
mains source parameters are within this band, SPF-25 would not change the
capacitors bank status.
If the mains parameters are out of this “No change band”, then SPF-25 calculates
the correct capacitor bank combination to be added / subtracted and within one
correction cycle brings it within the No change band.
The no change band width is selected as mentioned because it has to prevent unnecessary hunting (switching on/off) of the capacitor banks.

-5-

Back Side terminals:

Voltage
Feed-Back

Auxiliary
Supply

Current
Feed-Back
Output commands.

-6-

Capacitor
Current
Feed-Back

Typical Wiring with SPF-25 PF correction system.
L
O
A
D

L
C
R
+

L
C
R
-

L
C
Y
+

L
C
Y
-

L
C
B
+

L
C
B
-

PH 3
PH 2
PH 1
CCR+
CCRCCY+
CCYCCB+
CCB-

S
P
F
2
5

Auxiliary
Supply

L1
L2

Com
C01
C02
|

C06

Mains Connections:
Phase 1 control:
Neutral control:
Commands:
Load Current CT:
Capacitor Current CT:

-7-

Front Facia of SPF-25:
LCD Display

Step status LED indication
Serial Communication Port

Membrane Keypad

Usage of the UP and DN key makes the LCD display to scroll up
and down. This is used for display of various status as well as for
viewing the On line measured electrical values.
These keys are also used for changing values in Parameters
Editing mode and used for status changing of banks in Manual
mode.
Usage of ENT key is for entering the submenu and / or for setting
up some values.
The L and R keys are used in changing the position of the cursor
from Left to Right and vice-versa.

-8-

RS-232 serial communication 9 pin D connector:

5

4

6

3

7

2

8

1

9
RXD

GND

TXD

RS-232 cable connection Details:

PIN
NO

PC side
Connection

CONNECTION

SPF-25

1

NC

2

RXD

TXD

3

TXD

RXD

GND

GND

4
5
6
7
8
9

NC

-9-

Display of Various Parameters / Status:
PAGE: 00

COSΦ= -0.99 A OK

This is default display screen giving
information on PF, mode and
working status.

COSΦ= -0.99 :This part of the display indicates the Power Factor running value. The
sign –ve indicates that PF is Capacitive and no sign (+ve) indicates that PF is Inductive.
The PF indicated is the overall PF of the three phase system.
A or M :
This part either indicates the letter “A” or letter “M”. The letter A means
that SPF-25 is working in Auto mode.
The letter M means that SPF-25 is presently in Manual mode.
The Auto or Manual modes can be selected by pressing ENT key on this page.
(If Password option is enabled, enter the same by using UP/DN/L/R keys and then
Pressing ENT)
Then by UP or DN key you can stroll between the displays:
“1. Edit Mode”, “2. Auto Mode”, “3.Manual Mode”.
The first one “1.Edit Mode” is for parameter changing. The details of parameter changing
are explained in detail in later part of this manual.
The second and third one as display indicates are for selecting Auto or Manual mode
respectively. The ENT key pressed on selecting the mode desired, puts the SPF-25 into
that mode.
Auto Mode: In this mode SPF-25 works in automatic mode. It switches the capacitor
banks automatically depending on the parameter setting of target PF. This mode is the
default mode and is to be used for unmanned operation of the system controlled by
SPF-25.
Manual Mode: This mode is activated for checking/testing the capacitor banks switching.
Its also used for changing the Masking status of the capacitor banks. More on this is
explained later. (On Page 01 explanation)
OK or ** :
The last part of the display that is blinking every 500mS indicates the
working status of SPF-25. “OK” indicates that unit is working fine without any trip
conditions. If there is other indication, the meaning of the same can be as:
OK
:
No Fault
OC
:
Over Capacitor Current
UC
:
Under Capacitor Current
OL
:
Over Load
UL
:
Under Load
OV
:
Over Voltage
UV
:
Under Voltage
OF
:
Over Frequency
UF
:
Under Frequency
OH
:
Over Capacitor Current THD %.
OB
:
Out of Banks
LU
:
Load Unbalance
BF
:
Battery Failure (RTC)
NV
:
NVRAM Checksum Error
VA
:
Voltage Absent
- 10 -

PAGE: 01

PAGE: 01

______

AUTO

______

MAN

This display indicates the Bank status in Auto mode and in Manual mode it helps
to make the specific bank On or Off or declare masked.
: Means Bank is On.
: Means Bank is Off.
: Means Bank is Off and is declared masked (out of action)
: Means Bank does not exist for compensation.
When the Page 01 is in Auto mode, its only for indication of Bank status.
But in Manual mode, the “ENT” key press activates the manual control
mode. The cursor over the bank number starts blinking. The UP and DN
keys can turn On and Off the respective bank.
The DN key pressed puts the respective bank in Masking mode and another
press of DN key brings it out of Masking mode.

Putting the bank masking status permanently:
If a bank is to be permanently put in masked mode or is to be brought out of
permanent masked mode, it can be done by bringing the blinking cursor on
the position of the respective bank by use of L or R key. Then by pressing
DN key, bring the status of the bank to the required level (Masked or
Unmasked). Then press ENT key so that cursor stops blinking. After that by
pressing UP key go to Page 00. Then Press ENT. (If Password option is
enabled, enter the same by using UP/DN/L/R keys and then Press ENT)
“1.EDIT MODE” would be displayed. Press ENT one more time. “1.General
and IO” would be displayed. Press ENT again. “Pwd : Disable” or “Pwd :
Enable” would be displayed. Press UP key. “Exit: No Save” would be
displayed. Press ENT so that cursor will start blinking. Press UP. “Exit: With
Save” would be displayed with cursor blinking. Press ENT. “Saving in
EEPROM” would be displayed for a short time and then Page 00 would be
displayed.
You will observe that the bank status as requirement is changed
permanently to the status desired.

- 11 -

PAGE: 02

1.Overall Values
PRESS
PAGE: 02.1

Avg Vol: 415.7 V
PAGE: 02.2

Avg Cur: 0123.4A
PAGE: 02.3

Tot KW:

0081.2

PAGE: 02.4

TotKVAR: 0024.6
PAGE: 02.5

Tot KVA: 0101.1
PAGE: 02.6

Avg CC:

0031.3A

PAGE: 02.7

CKVAR:

028.35

PAGE: 02.8

LS PF:

0.82

PAGE: 02.9

LS KVAR: 0043.9
PAGE: 02.10

LS KVA:

0125.7

PAGE: 02.11

Freq:

49.9Hz

The Overall values Display menu has submenus as displayed above. As its
self explanatory it means:
Avg Vol: Average voltage of all the three line to line voltage values.
Avg Cur: Average current of all the three phase line current values.
Tot KW: Overall kW of the three phase system measured at source.
TotKVAR: Overall kVAr of the three phase system measured at source.
Tot KVA: Overall kVA of the three phase system measured at source.
Avg CC: Average of three phase current through capacitor panel.
CKVAR: Capacitive kVAr that is compensated by the system.
LS PF: Load side PF. (PF value if not compensated.
LS KVAR: Load side kVAr.
LS KVA: Load side kVA.
Freq: Supply frequency in Hz.
- 12 -

PAGE: 03

2.Per-Phase RMS

PRESS
PAGE: 03.1

R-Y Vol: 415.7 V
PAGE: 03.2

Y-B Vol: 415.7 V
PAGE: 03.3

B-R Vol: 415.7 V
PAGE: 03.4

Rph Cur: 0110.8A
PAGE: 03.5

Yph Cur: 0110.8A
PAGE: 03.6

Bph Cur: 0110.8A
PAGE: 03.7

Neutral: 0010.2A
PAGE: 03.8

Rph Cap: 0022.5A
PAGE: 03.9

Yph Cap: 0022.5A
PAGE: 03.10

Bph Cap: 0022.5A

Per Phase RMS: Submenu:
R-Y Vol: Measured AC Voltage RMS value across R and Y phase.
Y-B Vol: Measured AC Voltage RMS value across Y and B phase.
B-R Vol: Measured AC Voltage RMS value across B and R phase.
Rph Cur: Line current RMS value in R phase. Mains source.
Yph Cur: Line current RMS value in Y phase. Mains source.
Bph Cur: Line current RMS value in B phase. Mains source.
Neutral: Neutral current RMS value.
Rph Cap: Capacitor current RMS value in R phase.
Yph Cap: Capacitor current RMS value in Y phase.
Bph Cap: Capacitor current RMS value in B phase.

- 13 -

PAGE: 04

3.Power
PRESS
PAGE: 04.1

Rph PF:

PAGE: 04.10

1.00

Rph KVA: 0109.7

PAGE: 04.2

Yph PF:

PAGE: 04.11

1.00

Yph KVA: 0109.7

PAGE: 04.3

Bph PF:

PAGE: 04.12

1.00

Bph KVA: 0109.7

PAGE: 04.4

Rph KW:

PAGE: 04.13

0100.2

RphCKVAR: 010.76

PAGE: 04.5

Yph KW:

PAGE: 04.14

0100.2

YphCKVAR: 010.76

PAGE: 04.6

Bph KW:

PAGE: 04.15

0100.2

BphCKVAR: 010.76

PAGE: 04.7

PAGE: 04.16

RphKVAR: 0020.4

Rph mF

PAGE: 04.8

: 165.06

PAGE: 04.17

YphKVAR: 0020.4

Yph mF

PAGE: 04.9

: 165.06

PAGE: 04.18

BphKVAR: 0020.4

Bph mF

: 165.06

Power: Submenu:
Rph PF: Power Factor of R phase on mains source.
Yph PF: Power Factor of Y phase on mains source.
Bph PF: Power Factor of B phase on mains source.
Rph kW: Active Power in kW in R-phase.
Yph kW: Active Power in kW in Y-phase.
Bph kW: Active Power in kW in B-phase.
RphkVAR: Reactive Power in kVAr in R-phase.
YphkVAR: Reactive Power in kVAr in Y-phase.
BphkVAR: Reactive Power in kVAr in B-phase.
Rph KVA: Apparent Power in kVA in R-phase.
Yph KVA: Apparent Power in kVA in Y-phase.
Bph KVA: Apparent Power in kVA in B-phase.
RphCKVAR: Capacitor injected reactive power in R-phase.
YphCKVAR: Capacitor injected reactive power in Y-phase.
BphCKVAR: Capacitor injected reactive power in B-phase.
Rph mF: Capacitor value in micro-farad in R-phase.
Yph mF: Capacitor value in micro-farad in Y-phase.
Bph mF: Capacitor value in micro-farad in B-phase.
- 14 -

PAGE: 05

4.Energy
PRESS
PAGE: 05.1

KWH:

1234567.8

PAGE: 05.2

IndKVARH:12345.6
PAGE: 05.3

CapKVARH:12345.6
PAGE: 05.4

KVAH:

1234567.8

PAGE: 05.5

CKVARH:1234567.8

Energy: Submenu:
KWH: Overall cumulative active energy in kWh on Mains supply.
IndKVARH: Inductive reactive energy in kVArh on Mains supply.
CapKVARH: Capacitive reactive energy in kVArh on Mains supply.
KVAH: Overall cumulative apparent energy in kVA on Mains supply.
CKVARH: Capacitor compensated reactive energy in kVArh.

- 15 -

PAGE: 06

5.Harmonics
PRESS
PAGE: 06.1

Vr-THD-F: 002.4%
PAGE: 06.2

Vy-THD-F: 002.4%
PAGE: 06.3

Vb-THD-F: 002.4%
PAGE: 06.4

Ir-THD-F: 012.5%
PAGE: 06.5

Iy-THD-F: 012.5%
PAGE: 06.6

Ib-THD-F: 012.5%
PAGE: 06.7

In-THD-F: 005.0%
PAGE: 06.8

CCr-THD-F:028.2%
PAGE: 06.9

CCy-THD-F:028.2%
PAGE: 06.10

CCb-THD-F:028.2%

Harmonics: Submenu:
Vr-THD-F/R: R-Y line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Vy-THD-F/R: Y-B line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Vb-THD-F/R: B-R line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Ir-THD-F/R: R phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Iy-THD-F/R: Y phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Ib-THD-F/R: B phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
In-THD-F/R: Neutral current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
CCr-THD-F/R: R phase Capacitor current % Total Harmonic Distortion.
CCy-THD-F/R: Y phase Capacitor current % Total Harmonic Distortion.
CCb-THD-F/R: B phase Capacitor current % Total Harmonic Distortion.

- 16 -

PAGE: 07

6.Step KVAR
PRESS
PAGE: 07.1

Stp1 KVAR:0009.0
PAGE: 07.2

Stp2 KVAR:0009.0
PAGE: 07.3

Stp3 KVAR:0009.0
PAGE: 07.4

Stp4 KVAR:0009.0
PAGE: 07.5

Stp5 KVAR:0009.0
PAGE: 07.6

Stp6 KVAR:0009.0

Step KVAR: Submenu:
Stp1 KVAR: Step 1 kVAr value normalized at Capacitor rated voltage.
Stp2 KVAR: Step 2 kVAr value normalized at Capacitor rated voltage.
Stp3 KVAR: Step 3 kVAr value normalized at Capacitor rated voltage.
Stp4 KVAR: Step 4 kVAr value normalized at Capacitor rated voltage.
Stp5 KVAR: Step 5 kVAr value normalized at Capacitor rated voltage.
Stp6 KVAR: Step 6 kVAr value normalized at Capacitor rated voltage.

- 17 -

PAGE: 08

Time: 10:10:00
Real Time Clock: RTC time set in the SPF-25 is displayed here. Its in
HH:MM:SS format.

PAGE: 09

Date: 07:11:06
Real Time Clock: RTC date set in the SPF-25 is displayed here. Its in
dd:mm:yy format.

PAGE: 10

SPF-25 1.0.6

SPF-25 internal firmware version number is displayed here. (Just for user
information)

Total number of Main display pages are 11nos ranging from “00” to
“10”.

- 18 -

Method for Keyboard/Display usage.

Flow chart for entering into different modes:

PRESS
Enable

Default
Display
mode

If Password
Option is
Enable/Disable.

Disable

Enter Pwd: ****
PRESS
Enter the 4
Digit password
By use of
L, R, UP & DN
Keys.

PRESS

NO

IF
PASSWORD
Correct?

*

YES
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

1.Edit Mode

2.Auto Mode

3.Manual Mode

- 19 -

Parameter Editing Submenu Level 1:

*
1.General
2.System
3.Fault
4.Step
5.Communication

Sub-menu
Level 1
for
Parameter
Editing.

Parameter Editing
Sub-Menu
LEVEL 2

1.General and IO: Parameters related with general function and Input/Output
2. System: Electrical system (Mains supply) related parameters.

3. Fault: Setting Faults and fault levels.
4. Step: Capacitor Steps related parameters.
5. Communication: Parameters related with communication and data logging.

- 20 -

Parameter Editing Method:
(For Submenu Level 2 : L2)

Sub-Menu Level 1.
Cursor Blinking
at Parameter Values.

1.Submenu L2: ****

1.Submenu L2: ****
PRESS

key to increment value.

PRESS

Key to decrement value.

PRESS

Key to shift cursor Left.

PRESS

Key to shift cursor Right.
2.Submenu L2: ****

2.Submenu L2: ****
PRESS

key to increment value.

PRESS

Key to decrement value.

PRESS

Key to shift cursor Left.

PRESS

Key to shift cursor Right.

3.Submenu L2: ****

Exit: No Save

Exit: No Save

Without saving

Default
Display.

With saving

Screen for 1second

Saving In EEProm

Exit: With Save

- 21 -

Parameter Editing Submenu Level 2:
Menu
General

Parameter
Pwd
Ch-Pwd
Ld Def
THD
Rst. Energy

Meaning of Parameter
Password Control
Password value
Load all factory default parameters.
Type of THD factor to be displayed
Energy Counters reset to zero option

Default
Enable
1111
No
F-THD
No

Menu
System

Parameter
Meas. Vol.
Ld. Cur. Pr.
Cap. Cur. Pr.
PF Target
PF Target
Auto Sync
Async Tol.
Reset Async

Meaning of Parameter
Default
SPF-25 rated measurement voltage
440
Primary current value of mains CT
0180
0075
Primary current value of capacitor CT
Target PF for deciding Lag or Lead
Lag
1.00
Target PF exact value
Automatic synchronisation requirement Yes
% load variation tolerence for Auto-sync. 30
No
Reset Auto-sync to default value.

Menu
Fault

Parameter
Over Vol.
Over Vol. Lim
Over Vol. Clr
Under Vol.
Under Vol. Lim
Under Vol. Clr
Over Load
Over Ld. Lim
Over Ld. Clr
Under Ld.
Under Ld. Lim
Under Ld. Clr
Ld. Unbalance
Ld. Unb. Lim
Over CC
Over CC. Lim
Over CC. Clr
Over CC. Rst.
Over CC. Rst.
Under CC.
Under CC. Lim
Under CC. CLr
CC THD
CC THD Lim
CC THD Clr
Step Check
Cap. Cur Tol
Under Comp.
RTC Bat

Meaning of Parameter
Default
Over Voltage Fault: action by PDE-30 Off Step
Over Voltage activation limit value
1.10
Over Voltage resumption limit value 1.05
Under Voltage Fault: Action?
Off Step
Under Voltage activation limit value 0.70
Under Voltage resumption limit value 0.75
Over Load Fault: Action?
Indicate
Mains current over load limit value
1.30
Mains cur. over load resume value
1.25
Under Load on Mains: Action?
Indicate
Under load Activation limit value
0.03
Under load Resumption limit value
0.05
Load Un-balance Fault: Action?
Off Step
Load Un-balance limit
025%
Capacitor Over Current Fault: Action? Disable
Cap. Over Current Limit value.
1.30
Cap. Over Current Resume value.
1.25
Auto reset feature on Cap. Over Cur. No
If Over CC. Rst.=Yes. Time for reset. 120 sec
Under Capacitor current fault: Action? Disable
Under Cap. Cur. Limit value.
0.95
Under Cap. Cur. Resume value.
0.97
Capacitor current Over THD: Action? Disable
Cap.Cur. Over THD limit value.
0.10
Cap.Cur. Over THD resume value.
0.08
Every step kVAr healthiness monitor. Disable
Step kVAr healthiness: tolerence.
0.10
Out of Banks Indication.
Disable
RTC Battery fault monitoring.
Enable

- 22 -

Min
Disable
0000
No
R-THD
No
Min
Non
0001
0001
Lead
0.70Lag
No
01
No

Min

Max
Enable
9999
Yes
F-THD
Yes
Max
Edible
9999
9999
Lag
0.85Lead
Yes
50
Yes

Max

Disable, Indicative, Off Step

0.90
0.85

1.20
1.15

Disable, Indicative, Off Step

0.70
0.75

0.95
1.00

Disable, Indicative, Off Step

1.10
1.05

1.30
1.25

Disable, Indicative, Off Step

0.01
0.02

0.20
0.25

Disable, Indicative, Off Step

005%

100%

Disable, Indicative, Off Step

1.05
1.00
No
15

1.50
1.45
Yes
900

Disable, Indicative, Off Step

0.75
0.80

0.98
1.00

Disable, Indicative, Off Step

0.02
0.01
Disable
0.03
Disable
Disable

0.99
0.90
Enable
0.50
Enable
Enable

Menu
Step

Parameter
No. of Steps
Step Vol
Corr. Time
Discharge Time
Step 1 KVAR
Step 2 KVAR
Step 3 KVAR
Step 4 KVAR
Step 5 KVAR
Step 6 KVAR

Meaning of Parameter
Number of Capacitor steps utilised
Voltage at which kVAr is defined
Correction cycle time.
Capacitor discharge time.
Step 1 kVAr value.
Step 2 kVAr value.
Step 3 kVAr value.
Step 4 kVAr value.
Step 5 kVAr value.
Step 6 kVAr value.

Menu
Parameter
Meaning of Parameter
Communication Unit ID
Communication ID of the unit
Baud Rate
Serial communication baud rate.
Time
RTC time to be set
Date
RTC date to be set
Init RTC
Initialise RTC?
Clear NVRAM Clear all contents on NV RAM?

Default
3
440
120 secs
120 secs
006
009
018
018
018
018

Min
1
380
010
010
001
001
001
001
001
001

Default
3001
09600
--No
No

Min
0000
04800
--No
No

Max
6
660
240
240
250
250
250
250
250
250

Max
9999
38400
--Yes
Yes

Note that all the parameters in the Sub-Menu Level 2 should be carefully filled in the
SPF-25. Failing to put the correct parameters can make SPF-25 to malfunction.
Its therefore advised that a trained person should only be allowed to change these
values.

- 23 -

Commissioning Instructions :
before panel is powered up for the first time.
1. Panel Wiring Check
Ensure that all connections in the panel is tightened properly and there are no
loose connections. Also ensure that the wiring is done as per the wiring
diagram.
2. Power Wiring Check
Ensure that the power cables are connected properly from the Panel I/C to the
feeder I/C or the transformer bushings. The connection has to be after the
Load Feed back CT looking from the Transformer side.
Ensure that the Bus Bars and/or Lugs are clean and free of Dust, Corrosion or
Oxidation on the contact sides so that good electrical connection is maintained.
The surface area should be flat so as to get maximum contact area.
If required Clean the Bus Bars and/ or Lugs by rubbing it with Polish Paper to
remove the oxidation layer. Provide contact paste in between the contacts
surfaces.
Not performing this, can result in to a weaker source point for Capacitor
charging during Step on and this can generate undesirable Noise which can
hamper the performance of equipments installed in the capacitor panel.
3. Load Feed Back CT connection.
Ensure that the load feed back CT connections are done properly. Confirm that
correct phase CT is connected with the correct phase input terminals. (Even
though auto sync is capable of taking care of wrong CT polarities or CT
position interchanging, but then on display, the Phase readings may be seen to
be interchanged. (May be R-phase reading would be seen in B-phase and
vice-versa.
CT connections to be done carefully so as to ensure that the wire does not get
open and there is no loose connection.

Loose connection’s or open CT secondary can result in to very high voltages
getting developed in the circuit which can damage the CT and also produce
high levels of noise in the system.

- 24 -

Fault Finding Guidelines :

Fault Type

Probable Reason

Action to Take

Unit Does not
turn ON. No
display on LCD.

•Input auxiliary supply
not coming.
•Input side fuses
blown

•Check the input
supply to restore
•Check fuses in the
unit for OK.

Unit does not
turn On any
capacitors even
if PF is below
Lower PF limit.

•If auto-sync failure
message is there at
Power On.

• Load may be highly
fluctuating so need of
manual
synchronisation only.
• This is OK
condition.

• The load KW is too
low with Under load
fault enable condition.
•Control connections
from SPF-25 to
contactor coils are not
proper

•Check control supply
and connections from
SPF-25 to contactors.

BF indication on
Default display.

• Internal Ni-Cd
3.2Vdc battery used
for RTC and NV RAM
must be drained down.

• Replace this battery
in consultancy with
TAS trained
personnel.

Some Capacitor
banks are
declared as
faulty even if
they are
checked to be
OK.

•Individual step health
monitoring is enabled
and tolerance limits
set are too stringent.
• Capacitor current
THD factor is
continuously
fluctuating.

•Set the tolerance
limits for individual
steps monitoring as
relaxed.
• With continuously
fluctuating THD of
Capacitor current and
higher level of THD
can cause some
errors in individual
step KVAR
measurement. Under
this condition, best is
to keep this feature
disabled.

- 25 -

Fault Finding Guidelines (continued):

Fault Type

Probable Reason

Action to Take

Serial
Communication
is not working.

• Baud rate selection
is not proper.
• Unit ID is not set
properly.
• Serial
communication cable
connections are not
proper.

• Select proper baud
rate.
• Set the unit ID
correctly.
• Check the serial
cable continuity as
per the connections
given earlier in this
manual.

Data logging is
not taking place.

• Possible that RTC
date is not set
properly.

• Change the battery
by help of TAS’s
authorised person.

SPF-25 resets
occasionally on
turning OFF of
any contactor.

• The contactor supply
phase may be the
same as used for SPF25 auxiliary supply.
• RC snubbers/ free
wheeling diodes are
not put with contactor
coils.

• Use the different
phase for control
supply of contactors
and for SPF-25 supply
• Usage of RC
snubbers / free
wheeling diodes is
mandatory.

- 26 -

Corporate Office/Works/Design Centre:
W-61, MIDC, Ambad, Nasik - 422010, Maharashtra (India)
Tel: +91-(253)-2384038 / 2381090
Email: [email protected]
Marketing and After-Sales Service:
A/58, Kamal Pushpa, K.C. Road, Bandra, Mumbai-400050.
Tel: +91-9930513923
Email: [email protected]
Regional Office: Delhi
191-B, Ground Floor, Padam Nagar (Filter Market),
New Delhi - 110007 (India).
Tel: +91-9911615701
Email: [email protected]


Slide 15

Operations Manual
SPF-25/6
AUTOMATIC POWER FACTOR
CONTROLLER

TAS Powertek Pvt. Ltd.
Corporate Office:
W-61, MIDC, Ambad, Nasik - 422010, Maharashtra (India)
Tel: +91-(253)-2384038 / 2381090
Email: [email protected]

NOTE
These instructions do not purport to cover all details or
variations in equipment, nor to provide for every possible
contingency to be met in connection with installation,
operation or maintenance.

Should further information be desired or should particular
problems arise which are not covered sufficiently for the
purchasers purposes, the matter should be referred to our
TAS Powertek Pvt. Ltd., office.
The contents of this instruction Manual shall not become
part of or modify any prior or existing agreement or
relationship. The sales contract contains the entire
obligations of TAS Powertek Pvt. Ltd. The warranty
contained in the contract between the parties is the sole
warranty of TAS Powertek Pvt. Ltd. Any statements
contained herein do not create new warranties or modify the
existing warranty.

The reproduction, transmission or use of this
document or its contents is not permitted
without express written authority. Offenders
will be liable for damages. All rights are
reserved.

Index
Index Page
-----------------Features & Specifications
----------Mechanical Dimensions/ mounting --------Functional Block diagram
-----------------PF correction technique
-----------------Back Side terminals
-----------------------Typical wiring scheme ---------------------Front Facia
---------------------------------Communication connector connections ----Display of various parameters / Status ---Method of Keyboard/Display usage -------Parameter Submenu -----------------------Commissioning Instruction (before Powerup)
Fault finding Guidelines ---------------------

-1-

1
2
3
4
5
6
7
8
9
10
19
22
24
25

Features:
• Totally Micro-processor controlled Digital Signal processing
logic for measurements.
• All measurements with 1.0 class accuracy.
• Automatic Synchronisation capable of giving the correct
results for wrong connections at CT terminals (even wrong
polarity of CTs).
• Measurement and kVAr compensation are frequency / THD
compensated.
• Load V,Iph, In and Cap. current THD measurement.
• Up-to 6 output banks control.
• Capable of doing the kVAr measurements on basis of mean
of the correction cycle time and provide kVAr compensation.
• Standard 144 X 144 cabinet for panel door flush mounting.
• Serial communication through standard TAS protocols.
• Manual testing mode for user checking of the Capacitor steps
switching.
• Protections provided (user settable):
Over/under Voltage
Cap. Over/under current / THD.
Over/Under frequency (internally set limits)
Over / Under load.
Load unbalance.
Capacitor individual step kVAr monitoring.
Out of steps: Under-compensation (only for indication)
NV-RAM battery down.
• Data logging for various parameters for 2months period at an
interval of 1hr.
• Unit comes along with PC (Windows compatible) software
for downloading and viewing the logged data.

Specifications:
•
•
•
•
•
•
•
•
•
•
•
•

Feed-back Voltage:440Volt (+10%/-30%)
Current input : 1Amp for load and capacitor feed-back.
Measurement Accuracy: Class 1.0
Auxiliary Supply: 525Vac to 300Vac.
Correction / Discharge time:
Selectable in seconds from 10sec. to 240sec.
Output commands:
NO contacts each with current rating of 0.5Amp AC. at
240Vac.
RS-232 baud rate selectable from 4.8kBPS to 38.4kBPS.
Operating temperature: 0 to 55oC.
1.0class measurement Operating temperature: 0 to 50oC.
Storage temperature: -10 to +75oC.
Humidity: 0 to 98%.
Supply frequency: 45Hz to 55Hz.

-2-

Mechanical Dimensions:
135

144

135

120
144

6

Recommended size for cutout on panel door is 138 X 138.
All Dimensions given are in mm.

Maximum weight: (with clamps and terminals) = 2.5kg.

-3-

Functional Block Diagram:
3 channel
Current f.b.

3
Channel
Cap.
Current
f.b.

3 channel
Voltage f.b.

SPF-25

V, I, PF and Power
Measurement
Block
For every AC mains
Cycle.

Calculation
Block for
• Energy Parameters
• Harmonic analysis

EEPROM
For Data
Logging

Keyboard,
Display and
Other support
Functions
Block.

RS-232 Serial
Communication.
TAS-01
Protocol stack.

Power Factor
Correction Block
+ event monitoring.

Outputs Commands
For Capacitor
Switching.

Power Supply
Block.

Above block diagram gives the functional blocks that are built into SPF-25 PF
correction relay.
These blocks are made up with the combination of functions from hardware and
corresponding firmware that resides in the Program memory of the micro-processor
used therein.
Even though the basic blocks exists as shown in the diagram, there functionality is
interdependent. The entire combination is carefully designed so as to have
minimum effects of Electrical and Electromagnetic noise level on the functionality of
this SPF-25.
The firmware written takes into various error handling eventualities so that the
functioning of this PF relay is error free and highly reliable.

-4-

PF correction technique:
KVAr Inductive

Target
PF.
Cos Φ
= PF

1.5 X kVAr
Of Smallest
Capacitor bank

KW

No change band.
KVAr Capacitive
Capacitor Addition band.
Capacitor Removal band.
SPF-25 for kVAr compensation works with the kW v/s kVAr diagram as shown here
above.
A band is created across the target PF value. (Target PF is set by user). This band
is of +0.75 of the smallest capacitor bank kVAr. Thus, total band width is always 1.5
times the smallest capacitor bank kVAr used. This is a no change band. If the
mains source parameters are within this band, SPF-25 would not change the
capacitors bank status.
If the mains parameters are out of this “No change band”, then SPF-25 calculates
the correct capacitor bank combination to be added / subtracted and within one
correction cycle brings it within the No change band.
The no change band width is selected as mentioned because it has to prevent unnecessary hunting (switching on/off) of the capacitor banks.

-5-

Back Side terminals:

Voltage
Feed-Back

Auxiliary
Supply

Current
Feed-Back
Output commands.

-6-

Capacitor
Current
Feed-Back

Typical Wiring with SPF-25 PF correction system.
L
O
A
D

L
C
R
+

L
C
R
-

L
C
Y
+

L
C
Y
-

L
C
B
+

L
C
B
-

PH 3
PH 2
PH 1
CCR+
CCRCCY+
CCYCCB+
CCB-

S
P
F
2
5

Auxiliary
Supply

L1
L2

Com
C01
C02
|

C06

Mains Connections:
Phase 1 control:
Neutral control:
Commands:
Load Current CT:
Capacitor Current CT:

-7-

Front Facia of SPF-25:
LCD Display

Step status LED indication
Serial Communication Port

Membrane Keypad

Usage of the UP and DN key makes the LCD display to scroll up
and down. This is used for display of various status as well as for
viewing the On line measured electrical values.
These keys are also used for changing values in Parameters
Editing mode and used for status changing of banks in Manual
mode.
Usage of ENT key is for entering the submenu and / or for setting
up some values.
The L and R keys are used in changing the position of the cursor
from Left to Right and vice-versa.

-8-

RS-232 serial communication 9 pin D connector:

5

4

6

3

7

2

8

1

9
RXD

GND

TXD

RS-232 cable connection Details:

PIN
NO

PC side
Connection

CONNECTION

SPF-25

1

NC

2

RXD

TXD

3

TXD

RXD

GND

GND

4
5
6
7
8
9

NC

-9-

Display of Various Parameters / Status:
PAGE: 00

COSΦ= -0.99 A OK

This is default display screen giving
information on PF, mode and
working status.

COSΦ= -0.99 :This part of the display indicates the Power Factor running value. The
sign –ve indicates that PF is Capacitive and no sign (+ve) indicates that PF is Inductive.
The PF indicated is the overall PF of the three phase system.
A or M :
This part either indicates the letter “A” or letter “M”. The letter A means
that SPF-25 is working in Auto mode.
The letter M means that SPF-25 is presently in Manual mode.
The Auto or Manual modes can be selected by pressing ENT key on this page.
(If Password option is enabled, enter the same by using UP/DN/L/R keys and then
Pressing ENT)
Then by UP or DN key you can stroll between the displays:
“1. Edit Mode”, “2. Auto Mode”, “3.Manual Mode”.
The first one “1.Edit Mode” is for parameter changing. The details of parameter changing
are explained in detail in later part of this manual.
The second and third one as display indicates are for selecting Auto or Manual mode
respectively. The ENT key pressed on selecting the mode desired, puts the SPF-25 into
that mode.
Auto Mode: In this mode SPF-25 works in automatic mode. It switches the capacitor
banks automatically depending on the parameter setting of target PF. This mode is the
default mode and is to be used for unmanned operation of the system controlled by
SPF-25.
Manual Mode: This mode is activated for checking/testing the capacitor banks switching.
Its also used for changing the Masking status of the capacitor banks. More on this is
explained later. (On Page 01 explanation)
OK or ** :
The last part of the display that is blinking every 500mS indicates the
working status of SPF-25. “OK” indicates that unit is working fine without any trip
conditions. If there is other indication, the meaning of the same can be as:
OK
:
No Fault
OC
:
Over Capacitor Current
UC
:
Under Capacitor Current
OL
:
Over Load
UL
:
Under Load
OV
:
Over Voltage
UV
:
Under Voltage
OF
:
Over Frequency
UF
:
Under Frequency
OH
:
Over Capacitor Current THD %.
OB
:
Out of Banks
LU
:
Load Unbalance
BF
:
Battery Failure (RTC)
NV
:
NVRAM Checksum Error
VA
:
Voltage Absent
- 10 -

PAGE: 01

PAGE: 01

______

AUTO

______

MAN

This display indicates the Bank status in Auto mode and in Manual mode it helps
to make the specific bank On or Off or declare masked.
: Means Bank is On.
: Means Bank is Off.
: Means Bank is Off and is declared masked (out of action)
: Means Bank does not exist for compensation.
When the Page 01 is in Auto mode, its only for indication of Bank status.
But in Manual mode, the “ENT” key press activates the manual control
mode. The cursor over the bank number starts blinking. The UP and DN
keys can turn On and Off the respective bank.
The DN key pressed puts the respective bank in Masking mode and another
press of DN key brings it out of Masking mode.

Putting the bank masking status permanently:
If a bank is to be permanently put in masked mode or is to be brought out of
permanent masked mode, it can be done by bringing the blinking cursor on
the position of the respective bank by use of L or R key. Then by pressing
DN key, bring the status of the bank to the required level (Masked or
Unmasked). Then press ENT key so that cursor stops blinking. After that by
pressing UP key go to Page 00. Then Press ENT. (If Password option is
enabled, enter the same by using UP/DN/L/R keys and then Press ENT)
“1.EDIT MODE” would be displayed. Press ENT one more time. “1.General
and IO” would be displayed. Press ENT again. “Pwd : Disable” or “Pwd :
Enable” would be displayed. Press UP key. “Exit: No Save” would be
displayed. Press ENT so that cursor will start blinking. Press UP. “Exit: With
Save” would be displayed with cursor blinking. Press ENT. “Saving in
EEPROM” would be displayed for a short time and then Page 00 would be
displayed.
You will observe that the bank status as requirement is changed
permanently to the status desired.

- 11 -

PAGE: 02

1.Overall Values
PRESS
PAGE: 02.1

Avg Vol: 415.7 V
PAGE: 02.2

Avg Cur: 0123.4A
PAGE: 02.3

Tot KW:

0081.2

PAGE: 02.4

TotKVAR: 0024.6
PAGE: 02.5

Tot KVA: 0101.1
PAGE: 02.6

Avg CC:

0031.3A

PAGE: 02.7

CKVAR:

028.35

PAGE: 02.8

LS PF:

0.82

PAGE: 02.9

LS KVAR: 0043.9
PAGE: 02.10

LS KVA:

0125.7

PAGE: 02.11

Freq:

49.9Hz

The Overall values Display menu has submenus as displayed above. As its
self explanatory it means:
Avg Vol: Average voltage of all the three line to line voltage values.
Avg Cur: Average current of all the three phase line current values.
Tot KW: Overall kW of the three phase system measured at source.
TotKVAR: Overall kVAr of the three phase system measured at source.
Tot KVA: Overall kVA of the three phase system measured at source.
Avg CC: Average of three phase current through capacitor panel.
CKVAR: Capacitive kVAr that is compensated by the system.
LS PF: Load side PF. (PF value if not compensated.
LS KVAR: Load side kVAr.
LS KVA: Load side kVA.
Freq: Supply frequency in Hz.
- 12 -

PAGE: 03

2.Per-Phase RMS

PRESS
PAGE: 03.1

R-Y Vol: 415.7 V
PAGE: 03.2

Y-B Vol: 415.7 V
PAGE: 03.3

B-R Vol: 415.7 V
PAGE: 03.4

Rph Cur: 0110.8A
PAGE: 03.5

Yph Cur: 0110.8A
PAGE: 03.6

Bph Cur: 0110.8A
PAGE: 03.7

Neutral: 0010.2A
PAGE: 03.8

Rph Cap: 0022.5A
PAGE: 03.9

Yph Cap: 0022.5A
PAGE: 03.10

Bph Cap: 0022.5A

Per Phase RMS: Submenu:
R-Y Vol: Measured AC Voltage RMS value across R and Y phase.
Y-B Vol: Measured AC Voltage RMS value across Y and B phase.
B-R Vol: Measured AC Voltage RMS value across B and R phase.
Rph Cur: Line current RMS value in R phase. Mains source.
Yph Cur: Line current RMS value in Y phase. Mains source.
Bph Cur: Line current RMS value in B phase. Mains source.
Neutral: Neutral current RMS value.
Rph Cap: Capacitor current RMS value in R phase.
Yph Cap: Capacitor current RMS value in Y phase.
Bph Cap: Capacitor current RMS value in B phase.

- 13 -

PAGE: 04

3.Power
PRESS
PAGE: 04.1

Rph PF:

PAGE: 04.10

1.00

Rph KVA: 0109.7

PAGE: 04.2

Yph PF:

PAGE: 04.11

1.00

Yph KVA: 0109.7

PAGE: 04.3

Bph PF:

PAGE: 04.12

1.00

Bph KVA: 0109.7

PAGE: 04.4

Rph KW:

PAGE: 04.13

0100.2

RphCKVAR: 010.76

PAGE: 04.5

Yph KW:

PAGE: 04.14

0100.2

YphCKVAR: 010.76

PAGE: 04.6

Bph KW:

PAGE: 04.15

0100.2

BphCKVAR: 010.76

PAGE: 04.7

PAGE: 04.16

RphKVAR: 0020.4

Rph mF

PAGE: 04.8

: 165.06

PAGE: 04.17

YphKVAR: 0020.4

Yph mF

PAGE: 04.9

: 165.06

PAGE: 04.18

BphKVAR: 0020.4

Bph mF

: 165.06

Power: Submenu:
Rph PF: Power Factor of R phase on mains source.
Yph PF: Power Factor of Y phase on mains source.
Bph PF: Power Factor of B phase on mains source.
Rph kW: Active Power in kW in R-phase.
Yph kW: Active Power in kW in Y-phase.
Bph kW: Active Power in kW in B-phase.
RphkVAR: Reactive Power in kVAr in R-phase.
YphkVAR: Reactive Power in kVAr in Y-phase.
BphkVAR: Reactive Power in kVAr in B-phase.
Rph KVA: Apparent Power in kVA in R-phase.
Yph KVA: Apparent Power in kVA in Y-phase.
Bph KVA: Apparent Power in kVA in B-phase.
RphCKVAR: Capacitor injected reactive power in R-phase.
YphCKVAR: Capacitor injected reactive power in Y-phase.
BphCKVAR: Capacitor injected reactive power in B-phase.
Rph mF: Capacitor value in micro-farad in R-phase.
Yph mF: Capacitor value in micro-farad in Y-phase.
Bph mF: Capacitor value in micro-farad in B-phase.
- 14 -

PAGE: 05

4.Energy
PRESS
PAGE: 05.1

KWH:

1234567.8

PAGE: 05.2

IndKVARH:12345.6
PAGE: 05.3

CapKVARH:12345.6
PAGE: 05.4

KVAH:

1234567.8

PAGE: 05.5

CKVARH:1234567.8

Energy: Submenu:
KWH: Overall cumulative active energy in kWh on Mains supply.
IndKVARH: Inductive reactive energy in kVArh on Mains supply.
CapKVARH: Capacitive reactive energy in kVArh on Mains supply.
KVAH: Overall cumulative apparent energy in kVA on Mains supply.
CKVARH: Capacitor compensated reactive energy in kVArh.

- 15 -

PAGE: 06

5.Harmonics
PRESS
PAGE: 06.1

Vr-THD-F: 002.4%
PAGE: 06.2

Vy-THD-F: 002.4%
PAGE: 06.3

Vb-THD-F: 002.4%
PAGE: 06.4

Ir-THD-F: 012.5%
PAGE: 06.5

Iy-THD-F: 012.5%
PAGE: 06.6

Ib-THD-F: 012.5%
PAGE: 06.7

In-THD-F: 005.0%
PAGE: 06.8

CCr-THD-F:028.2%
PAGE: 06.9

CCy-THD-F:028.2%
PAGE: 06.10

CCb-THD-F:028.2%

Harmonics: Submenu:
Vr-THD-F/R: R-Y line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Vy-THD-F/R: Y-B line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Vb-THD-F/R: B-R line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Ir-THD-F/R: R phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Iy-THD-F/R: Y phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Ib-THD-F/R: B phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
In-THD-F/R: Neutral current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
CCr-THD-F/R: R phase Capacitor current % Total Harmonic Distortion.
CCy-THD-F/R: Y phase Capacitor current % Total Harmonic Distortion.
CCb-THD-F/R: B phase Capacitor current % Total Harmonic Distortion.

- 16 -

PAGE: 07

6.Step KVAR
PRESS
PAGE: 07.1

Stp1 KVAR:0009.0
PAGE: 07.2

Stp2 KVAR:0009.0
PAGE: 07.3

Stp3 KVAR:0009.0
PAGE: 07.4

Stp4 KVAR:0009.0
PAGE: 07.5

Stp5 KVAR:0009.0
PAGE: 07.6

Stp6 KVAR:0009.0

Step KVAR: Submenu:
Stp1 KVAR: Step 1 kVAr value normalized at Capacitor rated voltage.
Stp2 KVAR: Step 2 kVAr value normalized at Capacitor rated voltage.
Stp3 KVAR: Step 3 kVAr value normalized at Capacitor rated voltage.
Stp4 KVAR: Step 4 kVAr value normalized at Capacitor rated voltage.
Stp5 KVAR: Step 5 kVAr value normalized at Capacitor rated voltage.
Stp6 KVAR: Step 6 kVAr value normalized at Capacitor rated voltage.

- 17 -

PAGE: 08

Time: 10:10:00
Real Time Clock: RTC time set in the SPF-25 is displayed here. Its in
HH:MM:SS format.

PAGE: 09

Date: 07:11:06
Real Time Clock: RTC date set in the SPF-25 is displayed here. Its in
dd:mm:yy format.

PAGE: 10

SPF-25 1.0.6

SPF-25 internal firmware version number is displayed here. (Just for user
information)

Total number of Main display pages are 11nos ranging from “00” to
“10”.

- 18 -

Method for Keyboard/Display usage.

Flow chart for entering into different modes:

PRESS
Enable

Default
Display
mode

If Password
Option is
Enable/Disable.

Disable

Enter Pwd: ****
PRESS
Enter the 4
Digit password
By use of
L, R, UP & DN
Keys.

PRESS

NO

IF
PASSWORD
Correct?

*

YES
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

1.Edit Mode

2.Auto Mode

3.Manual Mode

- 19 -

Parameter Editing Submenu Level 1:

*
1.General
2.System
3.Fault
4.Step
5.Communication

Sub-menu
Level 1
for
Parameter
Editing.

Parameter Editing
Sub-Menu
LEVEL 2

1.General and IO: Parameters related with general function and Input/Output
2. System: Electrical system (Mains supply) related parameters.

3. Fault: Setting Faults and fault levels.
4. Step: Capacitor Steps related parameters.
5. Communication: Parameters related with communication and data logging.

- 20 -

Parameter Editing Method:
(For Submenu Level 2 : L2)

Sub-Menu Level 1.
Cursor Blinking
at Parameter Values.

1.Submenu L2: ****

1.Submenu L2: ****
PRESS

key to increment value.

PRESS

Key to decrement value.

PRESS

Key to shift cursor Left.

PRESS

Key to shift cursor Right.
2.Submenu L2: ****

2.Submenu L2: ****
PRESS

key to increment value.

PRESS

Key to decrement value.

PRESS

Key to shift cursor Left.

PRESS

Key to shift cursor Right.

3.Submenu L2: ****

Exit: No Save

Exit: No Save

Without saving

Default
Display.

With saving

Screen for 1second

Saving In EEProm

Exit: With Save

- 21 -

Parameter Editing Submenu Level 2:
Menu
General

Parameter
Pwd
Ch-Pwd
Ld Def
THD
Rst. Energy

Meaning of Parameter
Password Control
Password value
Load all factory default parameters.
Type of THD factor to be displayed
Energy Counters reset to zero option

Default
Enable
1111
No
F-THD
No

Menu
System

Parameter
Meas. Vol.
Ld. Cur. Pr.
Cap. Cur. Pr.
PF Target
PF Target
Auto Sync
Async Tol.
Reset Async

Meaning of Parameter
Default
SPF-25 rated measurement voltage
440
Primary current value of mains CT
0180
0075
Primary current value of capacitor CT
Target PF for deciding Lag or Lead
Lag
1.00
Target PF exact value
Automatic synchronisation requirement Yes
% load variation tolerence for Auto-sync. 30
No
Reset Auto-sync to default value.

Menu
Fault

Parameter
Over Vol.
Over Vol. Lim
Over Vol. Clr
Under Vol.
Under Vol. Lim
Under Vol. Clr
Over Load
Over Ld. Lim
Over Ld. Clr
Under Ld.
Under Ld. Lim
Under Ld. Clr
Ld. Unbalance
Ld. Unb. Lim
Over CC
Over CC. Lim
Over CC. Clr
Over CC. Rst.
Over CC. Rst.
Under CC.
Under CC. Lim
Under CC. CLr
CC THD
CC THD Lim
CC THD Clr
Step Check
Cap. Cur Tol
Under Comp.
RTC Bat

Meaning of Parameter
Default
Over Voltage Fault: action by PDE-30 Off Step
Over Voltage activation limit value
1.10
Over Voltage resumption limit value 1.05
Under Voltage Fault: Action?
Off Step
Under Voltage activation limit value 0.70
Under Voltage resumption limit value 0.75
Over Load Fault: Action?
Indicate
Mains current over load limit value
1.30
Mains cur. over load resume value
1.25
Under Load on Mains: Action?
Indicate
Under load Activation limit value
0.03
Under load Resumption limit value
0.05
Load Un-balance Fault: Action?
Off Step
Load Un-balance limit
025%
Capacitor Over Current Fault: Action? Disable
Cap. Over Current Limit value.
1.30
Cap. Over Current Resume value.
1.25
Auto reset feature on Cap. Over Cur. No
If Over CC. Rst.=Yes. Time for reset. 120 sec
Under Capacitor current fault: Action? Disable
Under Cap. Cur. Limit value.
0.95
Under Cap. Cur. Resume value.
0.97
Capacitor current Over THD: Action? Disable
Cap.Cur. Over THD limit value.
0.10
Cap.Cur. Over THD resume value.
0.08
Every step kVAr healthiness monitor. Disable
Step kVAr healthiness: tolerence.
0.10
Out of Banks Indication.
Disable
RTC Battery fault monitoring.
Enable

- 22 -

Min
Disable
0000
No
R-THD
No
Min
Non
0001
0001
Lead
0.70Lag
No
01
No

Min

Max
Enable
9999
Yes
F-THD
Yes
Max
Edible
9999
9999
Lag
0.85Lead
Yes
50
Yes

Max

Disable, Indicative, Off Step

0.90
0.85

1.20
1.15

Disable, Indicative, Off Step

0.70
0.75

0.95
1.00

Disable, Indicative, Off Step

1.10
1.05

1.30
1.25

Disable, Indicative, Off Step

0.01
0.02

0.20
0.25

Disable, Indicative, Off Step

005%

100%

Disable, Indicative, Off Step

1.05
1.00
No
15

1.50
1.45
Yes
900

Disable, Indicative, Off Step

0.75
0.80

0.98
1.00

Disable, Indicative, Off Step

0.02
0.01
Disable
0.03
Disable
Disable

0.99
0.90
Enable
0.50
Enable
Enable

Menu
Step

Parameter
No. of Steps
Step Vol
Corr. Time
Discharge Time
Step 1 KVAR
Step 2 KVAR
Step 3 KVAR
Step 4 KVAR
Step 5 KVAR
Step 6 KVAR

Meaning of Parameter
Number of Capacitor steps utilised
Voltage at which kVAr is defined
Correction cycle time.
Capacitor discharge time.
Step 1 kVAr value.
Step 2 kVAr value.
Step 3 kVAr value.
Step 4 kVAr value.
Step 5 kVAr value.
Step 6 kVAr value.

Menu
Parameter
Meaning of Parameter
Communication Unit ID
Communication ID of the unit
Baud Rate
Serial communication baud rate.
Time
RTC time to be set
Date
RTC date to be set
Init RTC
Initialise RTC?
Clear NVRAM Clear all contents on NV RAM?

Default
3
440
120 secs
120 secs
006
009
018
018
018
018

Min
1
380
010
010
001
001
001
001
001
001

Default
3001
09600
--No
No

Min
0000
04800
--No
No

Max
6
660
240
240
250
250
250
250
250
250

Max
9999
38400
--Yes
Yes

Note that all the parameters in the Sub-Menu Level 2 should be carefully filled in the
SPF-25. Failing to put the correct parameters can make SPF-25 to malfunction.
Its therefore advised that a trained person should only be allowed to change these
values.

- 23 -

Commissioning Instructions :
before panel is powered up for the first time.
1. Panel Wiring Check
Ensure that all connections in the panel is tightened properly and there are no
loose connections. Also ensure that the wiring is done as per the wiring
diagram.
2. Power Wiring Check
Ensure that the power cables are connected properly from the Panel I/C to the
feeder I/C or the transformer bushings. The connection has to be after the
Load Feed back CT looking from the Transformer side.
Ensure that the Bus Bars and/or Lugs are clean and free of Dust, Corrosion or
Oxidation on the contact sides so that good electrical connection is maintained.
The surface area should be flat so as to get maximum contact area.
If required Clean the Bus Bars and/ or Lugs by rubbing it with Polish Paper to
remove the oxidation layer. Provide contact paste in between the contacts
surfaces.
Not performing this, can result in to a weaker source point for Capacitor
charging during Step on and this can generate undesirable Noise which can
hamper the performance of equipments installed in the capacitor panel.
3. Load Feed Back CT connection.
Ensure that the load feed back CT connections are done properly. Confirm that
correct phase CT is connected with the correct phase input terminals. (Even
though auto sync is capable of taking care of wrong CT polarities or CT
position interchanging, but then on display, the Phase readings may be seen to
be interchanged. (May be R-phase reading would be seen in B-phase and
vice-versa.
CT connections to be done carefully so as to ensure that the wire does not get
open and there is no loose connection.

Loose connection’s or open CT secondary can result in to very high voltages
getting developed in the circuit which can damage the CT and also produce
high levels of noise in the system.

- 24 -

Fault Finding Guidelines :

Fault Type

Probable Reason

Action to Take

Unit Does not
turn ON. No
display on LCD.

•Input auxiliary supply
not coming.
•Input side fuses
blown

•Check the input
supply to restore
•Check fuses in the
unit for OK.

Unit does not
turn On any
capacitors even
if PF is below
Lower PF limit.

•If auto-sync failure
message is there at
Power On.

• Load may be highly
fluctuating so need of
manual
synchronisation only.
• This is OK
condition.

• The load KW is too
low with Under load
fault enable condition.
•Control connections
from SPF-25 to
contactor coils are not
proper

•Check control supply
and connections from
SPF-25 to contactors.

BF indication on
Default display.

• Internal Ni-Cd
3.2Vdc battery used
for RTC and NV RAM
must be drained down.

• Replace this battery
in consultancy with
TAS trained
personnel.

Some Capacitor
banks are
declared as
faulty even if
they are
checked to be
OK.

•Individual step health
monitoring is enabled
and tolerance limits
set are too stringent.
• Capacitor current
THD factor is
continuously
fluctuating.

•Set the tolerance
limits for individual
steps monitoring as
relaxed.
• With continuously
fluctuating THD of
Capacitor current and
higher level of THD
can cause some
errors in individual
step KVAR
measurement. Under
this condition, best is
to keep this feature
disabled.

- 25 -

Fault Finding Guidelines (continued):

Fault Type

Probable Reason

Action to Take

Serial
Communication
is not working.

• Baud rate selection
is not proper.
• Unit ID is not set
properly.
• Serial
communication cable
connections are not
proper.

• Select proper baud
rate.
• Set the unit ID
correctly.
• Check the serial
cable continuity as
per the connections
given earlier in this
manual.

Data logging is
not taking place.

• Possible that RTC
date is not set
properly.

• Change the battery
by help of TAS’s
authorised person.

SPF-25 resets
occasionally on
turning OFF of
any contactor.

• The contactor supply
phase may be the
same as used for SPF25 auxiliary supply.
• RC snubbers/ free
wheeling diodes are
not put with contactor
coils.

• Use the different
phase for control
supply of contactors
and for SPF-25 supply
• Usage of RC
snubbers / free
wheeling diodes is
mandatory.

- 26 -

Corporate Office/Works/Design Centre:
W-61, MIDC, Ambad, Nasik - 422010, Maharashtra (India)
Tel: +91-(253)-2384038 / 2381090
Email: [email protected]
Marketing and After-Sales Service:
A/58, Kamal Pushpa, K.C. Road, Bandra, Mumbai-400050.
Tel: +91-9930513923
Email: [email protected]
Regional Office: Delhi
191-B, Ground Floor, Padam Nagar (Filter Market),
New Delhi - 110007 (India).
Tel: +91-9911615701
Email: [email protected]


Slide 16

Operations Manual
SPF-25/6
AUTOMATIC POWER FACTOR
CONTROLLER

TAS Powertek Pvt. Ltd.
Corporate Office:
W-61, MIDC, Ambad, Nasik - 422010, Maharashtra (India)
Tel: +91-(253)-2384038 / 2381090
Email: [email protected]

NOTE
These instructions do not purport to cover all details or
variations in equipment, nor to provide for every possible
contingency to be met in connection with installation,
operation or maintenance.

Should further information be desired or should particular
problems arise which are not covered sufficiently for the
purchasers purposes, the matter should be referred to our
TAS Powertek Pvt. Ltd., office.
The contents of this instruction Manual shall not become
part of or modify any prior or existing agreement or
relationship. The sales contract contains the entire
obligations of TAS Powertek Pvt. Ltd. The warranty
contained in the contract between the parties is the sole
warranty of TAS Powertek Pvt. Ltd. Any statements
contained herein do not create new warranties or modify the
existing warranty.

The reproduction, transmission or use of this
document or its contents is not permitted
without express written authority. Offenders
will be liable for damages. All rights are
reserved.

Index
Index Page
-----------------Features & Specifications
----------Mechanical Dimensions/ mounting --------Functional Block diagram
-----------------PF correction technique
-----------------Back Side terminals
-----------------------Typical wiring scheme ---------------------Front Facia
---------------------------------Communication connector connections ----Display of various parameters / Status ---Method of Keyboard/Display usage -------Parameter Submenu -----------------------Commissioning Instruction (before Powerup)
Fault finding Guidelines ---------------------

-1-

1
2
3
4
5
6
7
8
9
10
19
22
24
25

Features:
• Totally Micro-processor controlled Digital Signal processing
logic for measurements.
• All measurements with 1.0 class accuracy.
• Automatic Synchronisation capable of giving the correct
results for wrong connections at CT terminals (even wrong
polarity of CTs).
• Measurement and kVAr compensation are frequency / THD
compensated.
• Load V,Iph, In and Cap. current THD measurement.
• Up-to 6 output banks control.
• Capable of doing the kVAr measurements on basis of mean
of the correction cycle time and provide kVAr compensation.
• Standard 144 X 144 cabinet for panel door flush mounting.
• Serial communication through standard TAS protocols.
• Manual testing mode for user checking of the Capacitor steps
switching.
• Protections provided (user settable):
Over/under Voltage
Cap. Over/under current / THD.
Over/Under frequency (internally set limits)
Over / Under load.
Load unbalance.
Capacitor individual step kVAr monitoring.
Out of steps: Under-compensation (only for indication)
NV-RAM battery down.
• Data logging for various parameters for 2months period at an
interval of 1hr.
• Unit comes along with PC (Windows compatible) software
for downloading and viewing the logged data.

Specifications:
•
•
•
•
•
•
•
•
•
•
•
•

Feed-back Voltage:440Volt (+10%/-30%)
Current input : 1Amp for load and capacitor feed-back.
Measurement Accuracy: Class 1.0
Auxiliary Supply: 525Vac to 300Vac.
Correction / Discharge time:
Selectable in seconds from 10sec. to 240sec.
Output commands:
NO contacts each with current rating of 0.5Amp AC. at
240Vac.
RS-232 baud rate selectable from 4.8kBPS to 38.4kBPS.
Operating temperature: 0 to 55oC.
1.0class measurement Operating temperature: 0 to 50oC.
Storage temperature: -10 to +75oC.
Humidity: 0 to 98%.
Supply frequency: 45Hz to 55Hz.

-2-

Mechanical Dimensions:
135

144

135

120
144

6

Recommended size for cutout on panel door is 138 X 138.
All Dimensions given are in mm.

Maximum weight: (with clamps and terminals) = 2.5kg.

-3-

Functional Block Diagram:
3 channel
Current f.b.

3
Channel
Cap.
Current
f.b.

3 channel
Voltage f.b.

SPF-25

V, I, PF and Power
Measurement
Block
For every AC mains
Cycle.

Calculation
Block for
• Energy Parameters
• Harmonic analysis

EEPROM
For Data
Logging

Keyboard,
Display and
Other support
Functions
Block.

RS-232 Serial
Communication.
TAS-01
Protocol stack.

Power Factor
Correction Block
+ event monitoring.

Outputs Commands
For Capacitor
Switching.

Power Supply
Block.

Above block diagram gives the functional blocks that are built into SPF-25 PF
correction relay.
These blocks are made up with the combination of functions from hardware and
corresponding firmware that resides in the Program memory of the micro-processor
used therein.
Even though the basic blocks exists as shown in the diagram, there functionality is
interdependent. The entire combination is carefully designed so as to have
minimum effects of Electrical and Electromagnetic noise level on the functionality of
this SPF-25.
The firmware written takes into various error handling eventualities so that the
functioning of this PF relay is error free and highly reliable.

-4-

PF correction technique:
KVAr Inductive

Target
PF.
Cos Φ
= PF

1.5 X kVAr
Of Smallest
Capacitor bank

KW

No change band.
KVAr Capacitive
Capacitor Addition band.
Capacitor Removal band.
SPF-25 for kVAr compensation works with the kW v/s kVAr diagram as shown here
above.
A band is created across the target PF value. (Target PF is set by user). This band
is of +0.75 of the smallest capacitor bank kVAr. Thus, total band width is always 1.5
times the smallest capacitor bank kVAr used. This is a no change band. If the
mains source parameters are within this band, SPF-25 would not change the
capacitors bank status.
If the mains parameters are out of this “No change band”, then SPF-25 calculates
the correct capacitor bank combination to be added / subtracted and within one
correction cycle brings it within the No change band.
The no change band width is selected as mentioned because it has to prevent unnecessary hunting (switching on/off) of the capacitor banks.

-5-

Back Side terminals:

Voltage
Feed-Back

Auxiliary
Supply

Current
Feed-Back
Output commands.

-6-

Capacitor
Current
Feed-Back

Typical Wiring with SPF-25 PF correction system.
L
O
A
D

L
C
R
+

L
C
R
-

L
C
Y
+

L
C
Y
-

L
C
B
+

L
C
B
-

PH 3
PH 2
PH 1
CCR+
CCRCCY+
CCYCCB+
CCB-

S
P
F
2
5

Auxiliary
Supply

L1
L2

Com
C01
C02
|

C06

Mains Connections:
Phase 1 control:
Neutral control:
Commands:
Load Current CT:
Capacitor Current CT:

-7-

Front Facia of SPF-25:
LCD Display

Step status LED indication
Serial Communication Port

Membrane Keypad

Usage of the UP and DN key makes the LCD display to scroll up
and down. This is used for display of various status as well as for
viewing the On line measured electrical values.
These keys are also used for changing values in Parameters
Editing mode and used for status changing of banks in Manual
mode.
Usage of ENT key is for entering the submenu and / or for setting
up some values.
The L and R keys are used in changing the position of the cursor
from Left to Right and vice-versa.

-8-

RS-232 serial communication 9 pin D connector:

5

4

6

3

7

2

8

1

9
RXD

GND

TXD

RS-232 cable connection Details:

PIN
NO

PC side
Connection

CONNECTION

SPF-25

1

NC

2

RXD

TXD

3

TXD

RXD

GND

GND

4
5
6
7
8
9

NC

-9-

Display of Various Parameters / Status:
PAGE: 00

COSΦ= -0.99 A OK

This is default display screen giving
information on PF, mode and
working status.

COSΦ= -0.99 :This part of the display indicates the Power Factor running value. The
sign –ve indicates that PF is Capacitive and no sign (+ve) indicates that PF is Inductive.
The PF indicated is the overall PF of the three phase system.
A or M :
This part either indicates the letter “A” or letter “M”. The letter A means
that SPF-25 is working in Auto mode.
The letter M means that SPF-25 is presently in Manual mode.
The Auto or Manual modes can be selected by pressing ENT key on this page.
(If Password option is enabled, enter the same by using UP/DN/L/R keys and then
Pressing ENT)
Then by UP or DN key you can stroll between the displays:
“1. Edit Mode”, “2. Auto Mode”, “3.Manual Mode”.
The first one “1.Edit Mode” is for parameter changing. The details of parameter changing
are explained in detail in later part of this manual.
The second and third one as display indicates are for selecting Auto or Manual mode
respectively. The ENT key pressed on selecting the mode desired, puts the SPF-25 into
that mode.
Auto Mode: In this mode SPF-25 works in automatic mode. It switches the capacitor
banks automatically depending on the parameter setting of target PF. This mode is the
default mode and is to be used for unmanned operation of the system controlled by
SPF-25.
Manual Mode: This mode is activated for checking/testing the capacitor banks switching.
Its also used for changing the Masking status of the capacitor banks. More on this is
explained later. (On Page 01 explanation)
OK or ** :
The last part of the display that is blinking every 500mS indicates the
working status of SPF-25. “OK” indicates that unit is working fine without any trip
conditions. If there is other indication, the meaning of the same can be as:
OK
:
No Fault
OC
:
Over Capacitor Current
UC
:
Under Capacitor Current
OL
:
Over Load
UL
:
Under Load
OV
:
Over Voltage
UV
:
Under Voltage
OF
:
Over Frequency
UF
:
Under Frequency
OH
:
Over Capacitor Current THD %.
OB
:
Out of Banks
LU
:
Load Unbalance
BF
:
Battery Failure (RTC)
NV
:
NVRAM Checksum Error
VA
:
Voltage Absent
- 10 -

PAGE: 01

PAGE: 01

______

AUTO

______

MAN

This display indicates the Bank status in Auto mode and in Manual mode it helps
to make the specific bank On or Off or declare masked.
: Means Bank is On.
: Means Bank is Off.
: Means Bank is Off and is declared masked (out of action)
: Means Bank does not exist for compensation.
When the Page 01 is in Auto mode, its only for indication of Bank status.
But in Manual mode, the “ENT” key press activates the manual control
mode. The cursor over the bank number starts blinking. The UP and DN
keys can turn On and Off the respective bank.
The DN key pressed puts the respective bank in Masking mode and another
press of DN key brings it out of Masking mode.

Putting the bank masking status permanently:
If a bank is to be permanently put in masked mode or is to be brought out of
permanent masked mode, it can be done by bringing the blinking cursor on
the position of the respective bank by use of L or R key. Then by pressing
DN key, bring the status of the bank to the required level (Masked or
Unmasked). Then press ENT key so that cursor stops blinking. After that by
pressing UP key go to Page 00. Then Press ENT. (If Password option is
enabled, enter the same by using UP/DN/L/R keys and then Press ENT)
“1.EDIT MODE” would be displayed. Press ENT one more time. “1.General
and IO” would be displayed. Press ENT again. “Pwd : Disable” or “Pwd :
Enable” would be displayed. Press UP key. “Exit: No Save” would be
displayed. Press ENT so that cursor will start blinking. Press UP. “Exit: With
Save” would be displayed with cursor blinking. Press ENT. “Saving in
EEPROM” would be displayed for a short time and then Page 00 would be
displayed.
You will observe that the bank status as requirement is changed
permanently to the status desired.

- 11 -

PAGE: 02

1.Overall Values
PRESS
PAGE: 02.1

Avg Vol: 415.7 V
PAGE: 02.2

Avg Cur: 0123.4A
PAGE: 02.3

Tot KW:

0081.2

PAGE: 02.4

TotKVAR: 0024.6
PAGE: 02.5

Tot KVA: 0101.1
PAGE: 02.6

Avg CC:

0031.3A

PAGE: 02.7

CKVAR:

028.35

PAGE: 02.8

LS PF:

0.82

PAGE: 02.9

LS KVAR: 0043.9
PAGE: 02.10

LS KVA:

0125.7

PAGE: 02.11

Freq:

49.9Hz

The Overall values Display menu has submenus as displayed above. As its
self explanatory it means:
Avg Vol: Average voltage of all the three line to line voltage values.
Avg Cur: Average current of all the three phase line current values.
Tot KW: Overall kW of the three phase system measured at source.
TotKVAR: Overall kVAr of the three phase system measured at source.
Tot KVA: Overall kVA of the three phase system measured at source.
Avg CC: Average of three phase current through capacitor panel.
CKVAR: Capacitive kVAr that is compensated by the system.
LS PF: Load side PF. (PF value if not compensated.
LS KVAR: Load side kVAr.
LS KVA: Load side kVA.
Freq: Supply frequency in Hz.
- 12 -

PAGE: 03

2.Per-Phase RMS

PRESS
PAGE: 03.1

R-Y Vol: 415.7 V
PAGE: 03.2

Y-B Vol: 415.7 V
PAGE: 03.3

B-R Vol: 415.7 V
PAGE: 03.4

Rph Cur: 0110.8A
PAGE: 03.5

Yph Cur: 0110.8A
PAGE: 03.6

Bph Cur: 0110.8A
PAGE: 03.7

Neutral: 0010.2A
PAGE: 03.8

Rph Cap: 0022.5A
PAGE: 03.9

Yph Cap: 0022.5A
PAGE: 03.10

Bph Cap: 0022.5A

Per Phase RMS: Submenu:
R-Y Vol: Measured AC Voltage RMS value across R and Y phase.
Y-B Vol: Measured AC Voltage RMS value across Y and B phase.
B-R Vol: Measured AC Voltage RMS value across B and R phase.
Rph Cur: Line current RMS value in R phase. Mains source.
Yph Cur: Line current RMS value in Y phase. Mains source.
Bph Cur: Line current RMS value in B phase. Mains source.
Neutral: Neutral current RMS value.
Rph Cap: Capacitor current RMS value in R phase.
Yph Cap: Capacitor current RMS value in Y phase.
Bph Cap: Capacitor current RMS value in B phase.

- 13 -

PAGE: 04

3.Power
PRESS
PAGE: 04.1

Rph PF:

PAGE: 04.10

1.00

Rph KVA: 0109.7

PAGE: 04.2

Yph PF:

PAGE: 04.11

1.00

Yph KVA: 0109.7

PAGE: 04.3

Bph PF:

PAGE: 04.12

1.00

Bph KVA: 0109.7

PAGE: 04.4

Rph KW:

PAGE: 04.13

0100.2

RphCKVAR: 010.76

PAGE: 04.5

Yph KW:

PAGE: 04.14

0100.2

YphCKVAR: 010.76

PAGE: 04.6

Bph KW:

PAGE: 04.15

0100.2

BphCKVAR: 010.76

PAGE: 04.7

PAGE: 04.16

RphKVAR: 0020.4

Rph mF

PAGE: 04.8

: 165.06

PAGE: 04.17

YphKVAR: 0020.4

Yph mF

PAGE: 04.9

: 165.06

PAGE: 04.18

BphKVAR: 0020.4

Bph mF

: 165.06

Power: Submenu:
Rph PF: Power Factor of R phase on mains source.
Yph PF: Power Factor of Y phase on mains source.
Bph PF: Power Factor of B phase on mains source.
Rph kW: Active Power in kW in R-phase.
Yph kW: Active Power in kW in Y-phase.
Bph kW: Active Power in kW in B-phase.
RphkVAR: Reactive Power in kVAr in R-phase.
YphkVAR: Reactive Power in kVAr in Y-phase.
BphkVAR: Reactive Power in kVAr in B-phase.
Rph KVA: Apparent Power in kVA in R-phase.
Yph KVA: Apparent Power in kVA in Y-phase.
Bph KVA: Apparent Power in kVA in B-phase.
RphCKVAR: Capacitor injected reactive power in R-phase.
YphCKVAR: Capacitor injected reactive power in Y-phase.
BphCKVAR: Capacitor injected reactive power in B-phase.
Rph mF: Capacitor value in micro-farad in R-phase.
Yph mF: Capacitor value in micro-farad in Y-phase.
Bph mF: Capacitor value in micro-farad in B-phase.
- 14 -

PAGE: 05

4.Energy
PRESS
PAGE: 05.1

KWH:

1234567.8

PAGE: 05.2

IndKVARH:12345.6
PAGE: 05.3

CapKVARH:12345.6
PAGE: 05.4

KVAH:

1234567.8

PAGE: 05.5

CKVARH:1234567.8

Energy: Submenu:
KWH: Overall cumulative active energy in kWh on Mains supply.
IndKVARH: Inductive reactive energy in kVArh on Mains supply.
CapKVARH: Capacitive reactive energy in kVArh on Mains supply.
KVAH: Overall cumulative apparent energy in kVA on Mains supply.
CKVARH: Capacitor compensated reactive energy in kVArh.

- 15 -

PAGE: 06

5.Harmonics
PRESS
PAGE: 06.1

Vr-THD-F: 002.4%
PAGE: 06.2

Vy-THD-F: 002.4%
PAGE: 06.3

Vb-THD-F: 002.4%
PAGE: 06.4

Ir-THD-F: 012.5%
PAGE: 06.5

Iy-THD-F: 012.5%
PAGE: 06.6

Ib-THD-F: 012.5%
PAGE: 06.7

In-THD-F: 005.0%
PAGE: 06.8

CCr-THD-F:028.2%
PAGE: 06.9

CCy-THD-F:028.2%
PAGE: 06.10

CCb-THD-F:028.2%

Harmonics: Submenu:
Vr-THD-F/R: R-Y line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Vy-THD-F/R: Y-B line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Vb-THD-F/R: B-R line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Ir-THD-F/R: R phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Iy-THD-F/R: Y phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Ib-THD-F/R: B phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
In-THD-F/R: Neutral current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
CCr-THD-F/R: R phase Capacitor current % Total Harmonic Distortion.
CCy-THD-F/R: Y phase Capacitor current % Total Harmonic Distortion.
CCb-THD-F/R: B phase Capacitor current % Total Harmonic Distortion.

- 16 -

PAGE: 07

6.Step KVAR
PRESS
PAGE: 07.1

Stp1 KVAR:0009.0
PAGE: 07.2

Stp2 KVAR:0009.0
PAGE: 07.3

Stp3 KVAR:0009.0
PAGE: 07.4

Stp4 KVAR:0009.0
PAGE: 07.5

Stp5 KVAR:0009.0
PAGE: 07.6

Stp6 KVAR:0009.0

Step KVAR: Submenu:
Stp1 KVAR: Step 1 kVAr value normalized at Capacitor rated voltage.
Stp2 KVAR: Step 2 kVAr value normalized at Capacitor rated voltage.
Stp3 KVAR: Step 3 kVAr value normalized at Capacitor rated voltage.
Stp4 KVAR: Step 4 kVAr value normalized at Capacitor rated voltage.
Stp5 KVAR: Step 5 kVAr value normalized at Capacitor rated voltage.
Stp6 KVAR: Step 6 kVAr value normalized at Capacitor rated voltage.

- 17 -

PAGE: 08

Time: 10:10:00
Real Time Clock: RTC time set in the SPF-25 is displayed here. Its in
HH:MM:SS format.

PAGE: 09

Date: 07:11:06
Real Time Clock: RTC date set in the SPF-25 is displayed here. Its in
dd:mm:yy format.

PAGE: 10

SPF-25 1.0.6

SPF-25 internal firmware version number is displayed here. (Just for user
information)

Total number of Main display pages are 11nos ranging from “00” to
“10”.

- 18 -

Method for Keyboard/Display usage.

Flow chart for entering into different modes:

PRESS
Enable

Default
Display
mode

If Password
Option is
Enable/Disable.

Disable

Enter Pwd: ****
PRESS
Enter the 4
Digit password
By use of
L, R, UP & DN
Keys.

PRESS

NO

IF
PASSWORD
Correct?

*

YES
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

1.Edit Mode

2.Auto Mode

3.Manual Mode

- 19 -

Parameter Editing Submenu Level 1:

*
1.General
2.System
3.Fault
4.Step
5.Communication

Sub-menu
Level 1
for
Parameter
Editing.

Parameter Editing
Sub-Menu
LEVEL 2

1.General and IO: Parameters related with general function and Input/Output
2. System: Electrical system (Mains supply) related parameters.

3. Fault: Setting Faults and fault levels.
4. Step: Capacitor Steps related parameters.
5. Communication: Parameters related with communication and data logging.

- 20 -

Parameter Editing Method:
(For Submenu Level 2 : L2)

Sub-Menu Level 1.
Cursor Blinking
at Parameter Values.

1.Submenu L2: ****

1.Submenu L2: ****
PRESS

key to increment value.

PRESS

Key to decrement value.

PRESS

Key to shift cursor Left.

PRESS

Key to shift cursor Right.
2.Submenu L2: ****

2.Submenu L2: ****
PRESS

key to increment value.

PRESS

Key to decrement value.

PRESS

Key to shift cursor Left.

PRESS

Key to shift cursor Right.

3.Submenu L2: ****

Exit: No Save

Exit: No Save

Without saving

Default
Display.

With saving

Screen for 1second

Saving In EEProm

Exit: With Save

- 21 -

Parameter Editing Submenu Level 2:
Menu
General

Parameter
Pwd
Ch-Pwd
Ld Def
THD
Rst. Energy

Meaning of Parameter
Password Control
Password value
Load all factory default parameters.
Type of THD factor to be displayed
Energy Counters reset to zero option

Default
Enable
1111
No
F-THD
No

Menu
System

Parameter
Meas. Vol.
Ld. Cur. Pr.
Cap. Cur. Pr.
PF Target
PF Target
Auto Sync
Async Tol.
Reset Async

Meaning of Parameter
Default
SPF-25 rated measurement voltage
440
Primary current value of mains CT
0180
0075
Primary current value of capacitor CT
Target PF for deciding Lag or Lead
Lag
1.00
Target PF exact value
Automatic synchronisation requirement Yes
% load variation tolerence for Auto-sync. 30
No
Reset Auto-sync to default value.

Menu
Fault

Parameter
Over Vol.
Over Vol. Lim
Over Vol. Clr
Under Vol.
Under Vol. Lim
Under Vol. Clr
Over Load
Over Ld. Lim
Over Ld. Clr
Under Ld.
Under Ld. Lim
Under Ld. Clr
Ld. Unbalance
Ld. Unb. Lim
Over CC
Over CC. Lim
Over CC. Clr
Over CC. Rst.
Over CC. Rst.
Under CC.
Under CC. Lim
Under CC. CLr
CC THD
CC THD Lim
CC THD Clr
Step Check
Cap. Cur Tol
Under Comp.
RTC Bat

Meaning of Parameter
Default
Over Voltage Fault: action by PDE-30 Off Step
Over Voltage activation limit value
1.10
Over Voltage resumption limit value 1.05
Under Voltage Fault: Action?
Off Step
Under Voltage activation limit value 0.70
Under Voltage resumption limit value 0.75
Over Load Fault: Action?
Indicate
Mains current over load limit value
1.30
Mains cur. over load resume value
1.25
Under Load on Mains: Action?
Indicate
Under load Activation limit value
0.03
Under load Resumption limit value
0.05
Load Un-balance Fault: Action?
Off Step
Load Un-balance limit
025%
Capacitor Over Current Fault: Action? Disable
Cap. Over Current Limit value.
1.30
Cap. Over Current Resume value.
1.25
Auto reset feature on Cap. Over Cur. No
If Over CC. Rst.=Yes. Time for reset. 120 sec
Under Capacitor current fault: Action? Disable
Under Cap. Cur. Limit value.
0.95
Under Cap. Cur. Resume value.
0.97
Capacitor current Over THD: Action? Disable
Cap.Cur. Over THD limit value.
0.10
Cap.Cur. Over THD resume value.
0.08
Every step kVAr healthiness monitor. Disable
Step kVAr healthiness: tolerence.
0.10
Out of Banks Indication.
Disable
RTC Battery fault monitoring.
Enable

- 22 -

Min
Disable
0000
No
R-THD
No
Min
Non
0001
0001
Lead
0.70Lag
No
01
No

Min

Max
Enable
9999
Yes
F-THD
Yes
Max
Edible
9999
9999
Lag
0.85Lead
Yes
50
Yes

Max

Disable, Indicative, Off Step

0.90
0.85

1.20
1.15

Disable, Indicative, Off Step

0.70
0.75

0.95
1.00

Disable, Indicative, Off Step

1.10
1.05

1.30
1.25

Disable, Indicative, Off Step

0.01
0.02

0.20
0.25

Disable, Indicative, Off Step

005%

100%

Disable, Indicative, Off Step

1.05
1.00
No
15

1.50
1.45
Yes
900

Disable, Indicative, Off Step

0.75
0.80

0.98
1.00

Disable, Indicative, Off Step

0.02
0.01
Disable
0.03
Disable
Disable

0.99
0.90
Enable
0.50
Enable
Enable

Menu
Step

Parameter
No. of Steps
Step Vol
Corr. Time
Discharge Time
Step 1 KVAR
Step 2 KVAR
Step 3 KVAR
Step 4 KVAR
Step 5 KVAR
Step 6 KVAR

Meaning of Parameter
Number of Capacitor steps utilised
Voltage at which kVAr is defined
Correction cycle time.
Capacitor discharge time.
Step 1 kVAr value.
Step 2 kVAr value.
Step 3 kVAr value.
Step 4 kVAr value.
Step 5 kVAr value.
Step 6 kVAr value.

Menu
Parameter
Meaning of Parameter
Communication Unit ID
Communication ID of the unit
Baud Rate
Serial communication baud rate.
Time
RTC time to be set
Date
RTC date to be set
Init RTC
Initialise RTC?
Clear NVRAM Clear all contents on NV RAM?

Default
3
440
120 secs
120 secs
006
009
018
018
018
018

Min
1
380
010
010
001
001
001
001
001
001

Default
3001
09600
--No
No

Min
0000
04800
--No
No

Max
6
660
240
240
250
250
250
250
250
250

Max
9999
38400
--Yes
Yes

Note that all the parameters in the Sub-Menu Level 2 should be carefully filled in the
SPF-25. Failing to put the correct parameters can make SPF-25 to malfunction.
Its therefore advised that a trained person should only be allowed to change these
values.

- 23 -

Commissioning Instructions :
before panel is powered up for the first time.
1. Panel Wiring Check
Ensure that all connections in the panel is tightened properly and there are no
loose connections. Also ensure that the wiring is done as per the wiring
diagram.
2. Power Wiring Check
Ensure that the power cables are connected properly from the Panel I/C to the
feeder I/C or the transformer bushings. The connection has to be after the
Load Feed back CT looking from the Transformer side.
Ensure that the Bus Bars and/or Lugs are clean and free of Dust, Corrosion or
Oxidation on the contact sides so that good electrical connection is maintained.
The surface area should be flat so as to get maximum contact area.
If required Clean the Bus Bars and/ or Lugs by rubbing it with Polish Paper to
remove the oxidation layer. Provide contact paste in between the contacts
surfaces.
Not performing this, can result in to a weaker source point for Capacitor
charging during Step on and this can generate undesirable Noise which can
hamper the performance of equipments installed in the capacitor panel.
3. Load Feed Back CT connection.
Ensure that the load feed back CT connections are done properly. Confirm that
correct phase CT is connected with the correct phase input terminals. (Even
though auto sync is capable of taking care of wrong CT polarities or CT
position interchanging, but then on display, the Phase readings may be seen to
be interchanged. (May be R-phase reading would be seen in B-phase and
vice-versa.
CT connections to be done carefully so as to ensure that the wire does not get
open and there is no loose connection.

Loose connection’s or open CT secondary can result in to very high voltages
getting developed in the circuit which can damage the CT and also produce
high levels of noise in the system.

- 24 -

Fault Finding Guidelines :

Fault Type

Probable Reason

Action to Take

Unit Does not
turn ON. No
display on LCD.

•Input auxiliary supply
not coming.
•Input side fuses
blown

•Check the input
supply to restore
•Check fuses in the
unit for OK.

Unit does not
turn On any
capacitors even
if PF is below
Lower PF limit.

•If auto-sync failure
message is there at
Power On.

• Load may be highly
fluctuating so need of
manual
synchronisation only.
• This is OK
condition.

• The load KW is too
low with Under load
fault enable condition.
•Control connections
from SPF-25 to
contactor coils are not
proper

•Check control supply
and connections from
SPF-25 to contactors.

BF indication on
Default display.

• Internal Ni-Cd
3.2Vdc battery used
for RTC and NV RAM
must be drained down.

• Replace this battery
in consultancy with
TAS trained
personnel.

Some Capacitor
banks are
declared as
faulty even if
they are
checked to be
OK.

•Individual step health
monitoring is enabled
and tolerance limits
set are too stringent.
• Capacitor current
THD factor is
continuously
fluctuating.

•Set the tolerance
limits for individual
steps monitoring as
relaxed.
• With continuously
fluctuating THD of
Capacitor current and
higher level of THD
can cause some
errors in individual
step KVAR
measurement. Under
this condition, best is
to keep this feature
disabled.

- 25 -

Fault Finding Guidelines (continued):

Fault Type

Probable Reason

Action to Take

Serial
Communication
is not working.

• Baud rate selection
is not proper.
• Unit ID is not set
properly.
• Serial
communication cable
connections are not
proper.

• Select proper baud
rate.
• Set the unit ID
correctly.
• Check the serial
cable continuity as
per the connections
given earlier in this
manual.

Data logging is
not taking place.

• Possible that RTC
date is not set
properly.

• Change the battery
by help of TAS’s
authorised person.

SPF-25 resets
occasionally on
turning OFF of
any contactor.

• The contactor supply
phase may be the
same as used for SPF25 auxiliary supply.
• RC snubbers/ free
wheeling diodes are
not put with contactor
coils.

• Use the different
phase for control
supply of contactors
and for SPF-25 supply
• Usage of RC
snubbers / free
wheeling diodes is
mandatory.

- 26 -

Corporate Office/Works/Design Centre:
W-61, MIDC, Ambad, Nasik - 422010, Maharashtra (India)
Tel: +91-(253)-2384038 / 2381090
Email: [email protected]
Marketing and After-Sales Service:
A/58, Kamal Pushpa, K.C. Road, Bandra, Mumbai-400050.
Tel: +91-9930513923
Email: [email protected]
Regional Office: Delhi
191-B, Ground Floor, Padam Nagar (Filter Market),
New Delhi - 110007 (India).
Tel: +91-9911615701
Email: [email protected]


Slide 17

Operations Manual
SPF-25/6
AUTOMATIC POWER FACTOR
CONTROLLER

TAS Powertek Pvt. Ltd.
Corporate Office:
W-61, MIDC, Ambad, Nasik - 422010, Maharashtra (India)
Tel: +91-(253)-2384038 / 2381090
Email: [email protected]

NOTE
These instructions do not purport to cover all details or
variations in equipment, nor to provide for every possible
contingency to be met in connection with installation,
operation or maintenance.

Should further information be desired or should particular
problems arise which are not covered sufficiently for the
purchasers purposes, the matter should be referred to our
TAS Powertek Pvt. Ltd., office.
The contents of this instruction Manual shall not become
part of or modify any prior or existing agreement or
relationship. The sales contract contains the entire
obligations of TAS Powertek Pvt. Ltd. The warranty
contained in the contract between the parties is the sole
warranty of TAS Powertek Pvt. Ltd. Any statements
contained herein do not create new warranties or modify the
existing warranty.

The reproduction, transmission or use of this
document or its contents is not permitted
without express written authority. Offenders
will be liable for damages. All rights are
reserved.

Index
Index Page
-----------------Features & Specifications
----------Mechanical Dimensions/ mounting --------Functional Block diagram
-----------------PF correction technique
-----------------Back Side terminals
-----------------------Typical wiring scheme ---------------------Front Facia
---------------------------------Communication connector connections ----Display of various parameters / Status ---Method of Keyboard/Display usage -------Parameter Submenu -----------------------Commissioning Instruction (before Powerup)
Fault finding Guidelines ---------------------

-1-

1
2
3
4
5
6
7
8
9
10
19
22
24
25

Features:
• Totally Micro-processor controlled Digital Signal processing
logic for measurements.
• All measurements with 1.0 class accuracy.
• Automatic Synchronisation capable of giving the correct
results for wrong connections at CT terminals (even wrong
polarity of CTs).
• Measurement and kVAr compensation are frequency / THD
compensated.
• Load V,Iph, In and Cap. current THD measurement.
• Up-to 6 output banks control.
• Capable of doing the kVAr measurements on basis of mean
of the correction cycle time and provide kVAr compensation.
• Standard 144 X 144 cabinet for panel door flush mounting.
• Serial communication through standard TAS protocols.
• Manual testing mode for user checking of the Capacitor steps
switching.
• Protections provided (user settable):
Over/under Voltage
Cap. Over/under current / THD.
Over/Under frequency (internally set limits)
Over / Under load.
Load unbalance.
Capacitor individual step kVAr monitoring.
Out of steps: Under-compensation (only for indication)
NV-RAM battery down.
• Data logging for various parameters for 2months period at an
interval of 1hr.
• Unit comes along with PC (Windows compatible) software
for downloading and viewing the logged data.

Specifications:
•
•
•
•
•
•
•
•
•
•
•
•

Feed-back Voltage:440Volt (+10%/-30%)
Current input : 1Amp for load and capacitor feed-back.
Measurement Accuracy: Class 1.0
Auxiliary Supply: 525Vac to 300Vac.
Correction / Discharge time:
Selectable in seconds from 10sec. to 240sec.
Output commands:
NO contacts each with current rating of 0.5Amp AC. at
240Vac.
RS-232 baud rate selectable from 4.8kBPS to 38.4kBPS.
Operating temperature: 0 to 55oC.
1.0class measurement Operating temperature: 0 to 50oC.
Storage temperature: -10 to +75oC.
Humidity: 0 to 98%.
Supply frequency: 45Hz to 55Hz.

-2-

Mechanical Dimensions:
135

144

135

120
144

6

Recommended size for cutout on panel door is 138 X 138.
All Dimensions given are in mm.

Maximum weight: (with clamps and terminals) = 2.5kg.

-3-

Functional Block Diagram:
3 channel
Current f.b.

3
Channel
Cap.
Current
f.b.

3 channel
Voltage f.b.

SPF-25

V, I, PF and Power
Measurement
Block
For every AC mains
Cycle.

Calculation
Block for
• Energy Parameters
• Harmonic analysis

EEPROM
For Data
Logging

Keyboard,
Display and
Other support
Functions
Block.

RS-232 Serial
Communication.
TAS-01
Protocol stack.

Power Factor
Correction Block
+ event monitoring.

Outputs Commands
For Capacitor
Switching.

Power Supply
Block.

Above block diagram gives the functional blocks that are built into SPF-25 PF
correction relay.
These blocks are made up with the combination of functions from hardware and
corresponding firmware that resides in the Program memory of the micro-processor
used therein.
Even though the basic blocks exists as shown in the diagram, there functionality is
interdependent. The entire combination is carefully designed so as to have
minimum effects of Electrical and Electromagnetic noise level on the functionality of
this SPF-25.
The firmware written takes into various error handling eventualities so that the
functioning of this PF relay is error free and highly reliable.

-4-

PF correction technique:
KVAr Inductive

Target
PF.
Cos Φ
= PF

1.5 X kVAr
Of Smallest
Capacitor bank

KW

No change band.
KVAr Capacitive
Capacitor Addition band.
Capacitor Removal band.
SPF-25 for kVAr compensation works with the kW v/s kVAr diagram as shown here
above.
A band is created across the target PF value. (Target PF is set by user). This band
is of +0.75 of the smallest capacitor bank kVAr. Thus, total band width is always 1.5
times the smallest capacitor bank kVAr used. This is a no change band. If the
mains source parameters are within this band, SPF-25 would not change the
capacitors bank status.
If the mains parameters are out of this “No change band”, then SPF-25 calculates
the correct capacitor bank combination to be added / subtracted and within one
correction cycle brings it within the No change band.
The no change band width is selected as mentioned because it has to prevent unnecessary hunting (switching on/off) of the capacitor banks.

-5-

Back Side terminals:

Voltage
Feed-Back

Auxiliary
Supply

Current
Feed-Back
Output commands.

-6-

Capacitor
Current
Feed-Back

Typical Wiring with SPF-25 PF correction system.
L
O
A
D

L
C
R
+

L
C
R
-

L
C
Y
+

L
C
Y
-

L
C
B
+

L
C
B
-

PH 3
PH 2
PH 1
CCR+
CCRCCY+
CCYCCB+
CCB-

S
P
F
2
5

Auxiliary
Supply

L1
L2

Com
C01
C02
|

C06

Mains Connections:
Phase 1 control:
Neutral control:
Commands:
Load Current CT:
Capacitor Current CT:

-7-

Front Facia of SPF-25:
LCD Display

Step status LED indication
Serial Communication Port

Membrane Keypad

Usage of the UP and DN key makes the LCD display to scroll up
and down. This is used for display of various status as well as for
viewing the On line measured electrical values.
These keys are also used for changing values in Parameters
Editing mode and used for status changing of banks in Manual
mode.
Usage of ENT key is for entering the submenu and / or for setting
up some values.
The L and R keys are used in changing the position of the cursor
from Left to Right and vice-versa.

-8-

RS-232 serial communication 9 pin D connector:

5

4

6

3

7

2

8

1

9
RXD

GND

TXD

RS-232 cable connection Details:

PIN
NO

PC side
Connection

CONNECTION

SPF-25

1

NC

2

RXD

TXD

3

TXD

RXD

GND

GND

4
5
6
7
8
9

NC

-9-

Display of Various Parameters / Status:
PAGE: 00

COSΦ= -0.99 A OK

This is default display screen giving
information on PF, mode and
working status.

COSΦ= -0.99 :This part of the display indicates the Power Factor running value. The
sign –ve indicates that PF is Capacitive and no sign (+ve) indicates that PF is Inductive.
The PF indicated is the overall PF of the three phase system.
A or M :
This part either indicates the letter “A” or letter “M”. The letter A means
that SPF-25 is working in Auto mode.
The letter M means that SPF-25 is presently in Manual mode.
The Auto or Manual modes can be selected by pressing ENT key on this page.
(If Password option is enabled, enter the same by using UP/DN/L/R keys and then
Pressing ENT)
Then by UP or DN key you can stroll between the displays:
“1. Edit Mode”, “2. Auto Mode”, “3.Manual Mode”.
The first one “1.Edit Mode” is for parameter changing. The details of parameter changing
are explained in detail in later part of this manual.
The second and third one as display indicates are for selecting Auto or Manual mode
respectively. The ENT key pressed on selecting the mode desired, puts the SPF-25 into
that mode.
Auto Mode: In this mode SPF-25 works in automatic mode. It switches the capacitor
banks automatically depending on the parameter setting of target PF. This mode is the
default mode and is to be used for unmanned operation of the system controlled by
SPF-25.
Manual Mode: This mode is activated for checking/testing the capacitor banks switching.
Its also used for changing the Masking status of the capacitor banks. More on this is
explained later. (On Page 01 explanation)
OK or ** :
The last part of the display that is blinking every 500mS indicates the
working status of SPF-25. “OK” indicates that unit is working fine without any trip
conditions. If there is other indication, the meaning of the same can be as:
OK
:
No Fault
OC
:
Over Capacitor Current
UC
:
Under Capacitor Current
OL
:
Over Load
UL
:
Under Load
OV
:
Over Voltage
UV
:
Under Voltage
OF
:
Over Frequency
UF
:
Under Frequency
OH
:
Over Capacitor Current THD %.
OB
:
Out of Banks
LU
:
Load Unbalance
BF
:
Battery Failure (RTC)
NV
:
NVRAM Checksum Error
VA
:
Voltage Absent
- 10 -

PAGE: 01

PAGE: 01

______

AUTO

______

MAN

This display indicates the Bank status in Auto mode and in Manual mode it helps
to make the specific bank On or Off or declare masked.
: Means Bank is On.
: Means Bank is Off.
: Means Bank is Off and is declared masked (out of action)
: Means Bank does not exist for compensation.
When the Page 01 is in Auto mode, its only for indication of Bank status.
But in Manual mode, the “ENT” key press activates the manual control
mode. The cursor over the bank number starts blinking. The UP and DN
keys can turn On and Off the respective bank.
The DN key pressed puts the respective bank in Masking mode and another
press of DN key brings it out of Masking mode.

Putting the bank masking status permanently:
If a bank is to be permanently put in masked mode or is to be brought out of
permanent masked mode, it can be done by bringing the blinking cursor on
the position of the respective bank by use of L or R key. Then by pressing
DN key, bring the status of the bank to the required level (Masked or
Unmasked). Then press ENT key so that cursor stops blinking. After that by
pressing UP key go to Page 00. Then Press ENT. (If Password option is
enabled, enter the same by using UP/DN/L/R keys and then Press ENT)
“1.EDIT MODE” would be displayed. Press ENT one more time. “1.General
and IO” would be displayed. Press ENT again. “Pwd : Disable” or “Pwd :
Enable” would be displayed. Press UP key. “Exit: No Save” would be
displayed. Press ENT so that cursor will start blinking. Press UP. “Exit: With
Save” would be displayed with cursor blinking. Press ENT. “Saving in
EEPROM” would be displayed for a short time and then Page 00 would be
displayed.
You will observe that the bank status as requirement is changed
permanently to the status desired.

- 11 -

PAGE: 02

1.Overall Values
PRESS
PAGE: 02.1

Avg Vol: 415.7 V
PAGE: 02.2

Avg Cur: 0123.4A
PAGE: 02.3

Tot KW:

0081.2

PAGE: 02.4

TotKVAR: 0024.6
PAGE: 02.5

Tot KVA: 0101.1
PAGE: 02.6

Avg CC:

0031.3A

PAGE: 02.7

CKVAR:

028.35

PAGE: 02.8

LS PF:

0.82

PAGE: 02.9

LS KVAR: 0043.9
PAGE: 02.10

LS KVA:

0125.7

PAGE: 02.11

Freq:

49.9Hz

The Overall values Display menu has submenus as displayed above. As its
self explanatory it means:
Avg Vol: Average voltage of all the three line to line voltage values.
Avg Cur: Average current of all the three phase line current values.
Tot KW: Overall kW of the three phase system measured at source.
TotKVAR: Overall kVAr of the three phase system measured at source.
Tot KVA: Overall kVA of the three phase system measured at source.
Avg CC: Average of three phase current through capacitor panel.
CKVAR: Capacitive kVAr that is compensated by the system.
LS PF: Load side PF. (PF value if not compensated.
LS KVAR: Load side kVAr.
LS KVA: Load side kVA.
Freq: Supply frequency in Hz.
- 12 -

PAGE: 03

2.Per-Phase RMS

PRESS
PAGE: 03.1

R-Y Vol: 415.7 V
PAGE: 03.2

Y-B Vol: 415.7 V
PAGE: 03.3

B-R Vol: 415.7 V
PAGE: 03.4

Rph Cur: 0110.8A
PAGE: 03.5

Yph Cur: 0110.8A
PAGE: 03.6

Bph Cur: 0110.8A
PAGE: 03.7

Neutral: 0010.2A
PAGE: 03.8

Rph Cap: 0022.5A
PAGE: 03.9

Yph Cap: 0022.5A
PAGE: 03.10

Bph Cap: 0022.5A

Per Phase RMS: Submenu:
R-Y Vol: Measured AC Voltage RMS value across R and Y phase.
Y-B Vol: Measured AC Voltage RMS value across Y and B phase.
B-R Vol: Measured AC Voltage RMS value across B and R phase.
Rph Cur: Line current RMS value in R phase. Mains source.
Yph Cur: Line current RMS value in Y phase. Mains source.
Bph Cur: Line current RMS value in B phase. Mains source.
Neutral: Neutral current RMS value.
Rph Cap: Capacitor current RMS value in R phase.
Yph Cap: Capacitor current RMS value in Y phase.
Bph Cap: Capacitor current RMS value in B phase.

- 13 -

PAGE: 04

3.Power
PRESS
PAGE: 04.1

Rph PF:

PAGE: 04.10

1.00

Rph KVA: 0109.7

PAGE: 04.2

Yph PF:

PAGE: 04.11

1.00

Yph KVA: 0109.7

PAGE: 04.3

Bph PF:

PAGE: 04.12

1.00

Bph KVA: 0109.7

PAGE: 04.4

Rph KW:

PAGE: 04.13

0100.2

RphCKVAR: 010.76

PAGE: 04.5

Yph KW:

PAGE: 04.14

0100.2

YphCKVAR: 010.76

PAGE: 04.6

Bph KW:

PAGE: 04.15

0100.2

BphCKVAR: 010.76

PAGE: 04.7

PAGE: 04.16

RphKVAR: 0020.4

Rph mF

PAGE: 04.8

: 165.06

PAGE: 04.17

YphKVAR: 0020.4

Yph mF

PAGE: 04.9

: 165.06

PAGE: 04.18

BphKVAR: 0020.4

Bph mF

: 165.06

Power: Submenu:
Rph PF: Power Factor of R phase on mains source.
Yph PF: Power Factor of Y phase on mains source.
Bph PF: Power Factor of B phase on mains source.
Rph kW: Active Power in kW in R-phase.
Yph kW: Active Power in kW in Y-phase.
Bph kW: Active Power in kW in B-phase.
RphkVAR: Reactive Power in kVAr in R-phase.
YphkVAR: Reactive Power in kVAr in Y-phase.
BphkVAR: Reactive Power in kVAr in B-phase.
Rph KVA: Apparent Power in kVA in R-phase.
Yph KVA: Apparent Power in kVA in Y-phase.
Bph KVA: Apparent Power in kVA in B-phase.
RphCKVAR: Capacitor injected reactive power in R-phase.
YphCKVAR: Capacitor injected reactive power in Y-phase.
BphCKVAR: Capacitor injected reactive power in B-phase.
Rph mF: Capacitor value in micro-farad in R-phase.
Yph mF: Capacitor value in micro-farad in Y-phase.
Bph mF: Capacitor value in micro-farad in B-phase.
- 14 -

PAGE: 05

4.Energy
PRESS
PAGE: 05.1

KWH:

1234567.8

PAGE: 05.2

IndKVARH:12345.6
PAGE: 05.3

CapKVARH:12345.6
PAGE: 05.4

KVAH:

1234567.8

PAGE: 05.5

CKVARH:1234567.8

Energy: Submenu:
KWH: Overall cumulative active energy in kWh on Mains supply.
IndKVARH: Inductive reactive energy in kVArh on Mains supply.
CapKVARH: Capacitive reactive energy in kVArh on Mains supply.
KVAH: Overall cumulative apparent energy in kVA on Mains supply.
CKVARH: Capacitor compensated reactive energy in kVArh.

- 15 -

PAGE: 06

5.Harmonics
PRESS
PAGE: 06.1

Vr-THD-F: 002.4%
PAGE: 06.2

Vy-THD-F: 002.4%
PAGE: 06.3

Vb-THD-F: 002.4%
PAGE: 06.4

Ir-THD-F: 012.5%
PAGE: 06.5

Iy-THD-F: 012.5%
PAGE: 06.6

Ib-THD-F: 012.5%
PAGE: 06.7

In-THD-F: 005.0%
PAGE: 06.8

CCr-THD-F:028.2%
PAGE: 06.9

CCy-THD-F:028.2%
PAGE: 06.10

CCb-THD-F:028.2%

Harmonics: Submenu:
Vr-THD-F/R: R-Y line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Vy-THD-F/R: Y-B line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Vb-THD-F/R: B-R line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Ir-THD-F/R: R phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Iy-THD-F/R: Y phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Ib-THD-F/R: B phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
In-THD-F/R: Neutral current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
CCr-THD-F/R: R phase Capacitor current % Total Harmonic Distortion.
CCy-THD-F/R: Y phase Capacitor current % Total Harmonic Distortion.
CCb-THD-F/R: B phase Capacitor current % Total Harmonic Distortion.

- 16 -

PAGE: 07

6.Step KVAR
PRESS
PAGE: 07.1

Stp1 KVAR:0009.0
PAGE: 07.2

Stp2 KVAR:0009.0
PAGE: 07.3

Stp3 KVAR:0009.0
PAGE: 07.4

Stp4 KVAR:0009.0
PAGE: 07.5

Stp5 KVAR:0009.0
PAGE: 07.6

Stp6 KVAR:0009.0

Step KVAR: Submenu:
Stp1 KVAR: Step 1 kVAr value normalized at Capacitor rated voltage.
Stp2 KVAR: Step 2 kVAr value normalized at Capacitor rated voltage.
Stp3 KVAR: Step 3 kVAr value normalized at Capacitor rated voltage.
Stp4 KVAR: Step 4 kVAr value normalized at Capacitor rated voltage.
Stp5 KVAR: Step 5 kVAr value normalized at Capacitor rated voltage.
Stp6 KVAR: Step 6 kVAr value normalized at Capacitor rated voltage.

- 17 -

PAGE: 08

Time: 10:10:00
Real Time Clock: RTC time set in the SPF-25 is displayed here. Its in
HH:MM:SS format.

PAGE: 09

Date: 07:11:06
Real Time Clock: RTC date set in the SPF-25 is displayed here. Its in
dd:mm:yy format.

PAGE: 10

SPF-25 1.0.6

SPF-25 internal firmware version number is displayed here. (Just for user
information)

Total number of Main display pages are 11nos ranging from “00” to
“10”.

- 18 -

Method for Keyboard/Display usage.

Flow chart for entering into different modes:

PRESS
Enable

Default
Display
mode

If Password
Option is
Enable/Disable.

Disable

Enter Pwd: ****
PRESS
Enter the 4
Digit password
By use of
L, R, UP & DN
Keys.

PRESS

NO

IF
PASSWORD
Correct?

*

YES
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

1.Edit Mode

2.Auto Mode

3.Manual Mode

- 19 -

Parameter Editing Submenu Level 1:

*
1.General
2.System
3.Fault
4.Step
5.Communication

Sub-menu
Level 1
for
Parameter
Editing.

Parameter Editing
Sub-Menu
LEVEL 2

1.General and IO: Parameters related with general function and Input/Output
2. System: Electrical system (Mains supply) related parameters.

3. Fault: Setting Faults and fault levels.
4. Step: Capacitor Steps related parameters.
5. Communication: Parameters related with communication and data logging.

- 20 -

Parameter Editing Method:
(For Submenu Level 2 : L2)

Sub-Menu Level 1.
Cursor Blinking
at Parameter Values.

1.Submenu L2: ****

1.Submenu L2: ****
PRESS

key to increment value.

PRESS

Key to decrement value.

PRESS

Key to shift cursor Left.

PRESS

Key to shift cursor Right.
2.Submenu L2: ****

2.Submenu L2: ****
PRESS

key to increment value.

PRESS

Key to decrement value.

PRESS

Key to shift cursor Left.

PRESS

Key to shift cursor Right.

3.Submenu L2: ****

Exit: No Save

Exit: No Save

Without saving

Default
Display.

With saving

Screen for 1second

Saving In EEProm

Exit: With Save

- 21 -

Parameter Editing Submenu Level 2:
Menu
General

Parameter
Pwd
Ch-Pwd
Ld Def
THD
Rst. Energy

Meaning of Parameter
Password Control
Password value
Load all factory default parameters.
Type of THD factor to be displayed
Energy Counters reset to zero option

Default
Enable
1111
No
F-THD
No

Menu
System

Parameter
Meas. Vol.
Ld. Cur. Pr.
Cap. Cur. Pr.
PF Target
PF Target
Auto Sync
Async Tol.
Reset Async

Meaning of Parameter
Default
SPF-25 rated measurement voltage
440
Primary current value of mains CT
0180
0075
Primary current value of capacitor CT
Target PF for deciding Lag or Lead
Lag
1.00
Target PF exact value
Automatic synchronisation requirement Yes
% load variation tolerence for Auto-sync. 30
No
Reset Auto-sync to default value.

Menu
Fault

Parameter
Over Vol.
Over Vol. Lim
Over Vol. Clr
Under Vol.
Under Vol. Lim
Under Vol. Clr
Over Load
Over Ld. Lim
Over Ld. Clr
Under Ld.
Under Ld. Lim
Under Ld. Clr
Ld. Unbalance
Ld. Unb. Lim
Over CC
Over CC. Lim
Over CC. Clr
Over CC. Rst.
Over CC. Rst.
Under CC.
Under CC. Lim
Under CC. CLr
CC THD
CC THD Lim
CC THD Clr
Step Check
Cap. Cur Tol
Under Comp.
RTC Bat

Meaning of Parameter
Default
Over Voltage Fault: action by PDE-30 Off Step
Over Voltage activation limit value
1.10
Over Voltage resumption limit value 1.05
Under Voltage Fault: Action?
Off Step
Under Voltage activation limit value 0.70
Under Voltage resumption limit value 0.75
Over Load Fault: Action?
Indicate
Mains current over load limit value
1.30
Mains cur. over load resume value
1.25
Under Load on Mains: Action?
Indicate
Under load Activation limit value
0.03
Under load Resumption limit value
0.05
Load Un-balance Fault: Action?
Off Step
Load Un-balance limit
025%
Capacitor Over Current Fault: Action? Disable
Cap. Over Current Limit value.
1.30
Cap. Over Current Resume value.
1.25
Auto reset feature on Cap. Over Cur. No
If Over CC. Rst.=Yes. Time for reset. 120 sec
Under Capacitor current fault: Action? Disable
Under Cap. Cur. Limit value.
0.95
Under Cap. Cur. Resume value.
0.97
Capacitor current Over THD: Action? Disable
Cap.Cur. Over THD limit value.
0.10
Cap.Cur. Over THD resume value.
0.08
Every step kVAr healthiness monitor. Disable
Step kVAr healthiness: tolerence.
0.10
Out of Banks Indication.
Disable
RTC Battery fault monitoring.
Enable

- 22 -

Min
Disable
0000
No
R-THD
No
Min
Non
0001
0001
Lead
0.70Lag
No
01
No

Min

Max
Enable
9999
Yes
F-THD
Yes
Max
Edible
9999
9999
Lag
0.85Lead
Yes
50
Yes

Max

Disable, Indicative, Off Step

0.90
0.85

1.20
1.15

Disable, Indicative, Off Step

0.70
0.75

0.95
1.00

Disable, Indicative, Off Step

1.10
1.05

1.30
1.25

Disable, Indicative, Off Step

0.01
0.02

0.20
0.25

Disable, Indicative, Off Step

005%

100%

Disable, Indicative, Off Step

1.05
1.00
No
15

1.50
1.45
Yes
900

Disable, Indicative, Off Step

0.75
0.80

0.98
1.00

Disable, Indicative, Off Step

0.02
0.01
Disable
0.03
Disable
Disable

0.99
0.90
Enable
0.50
Enable
Enable

Menu
Step

Parameter
No. of Steps
Step Vol
Corr. Time
Discharge Time
Step 1 KVAR
Step 2 KVAR
Step 3 KVAR
Step 4 KVAR
Step 5 KVAR
Step 6 KVAR

Meaning of Parameter
Number of Capacitor steps utilised
Voltage at which kVAr is defined
Correction cycle time.
Capacitor discharge time.
Step 1 kVAr value.
Step 2 kVAr value.
Step 3 kVAr value.
Step 4 kVAr value.
Step 5 kVAr value.
Step 6 kVAr value.

Menu
Parameter
Meaning of Parameter
Communication Unit ID
Communication ID of the unit
Baud Rate
Serial communication baud rate.
Time
RTC time to be set
Date
RTC date to be set
Init RTC
Initialise RTC?
Clear NVRAM Clear all contents on NV RAM?

Default
3
440
120 secs
120 secs
006
009
018
018
018
018

Min
1
380
010
010
001
001
001
001
001
001

Default
3001
09600
--No
No

Min
0000
04800
--No
No

Max
6
660
240
240
250
250
250
250
250
250

Max
9999
38400
--Yes
Yes

Note that all the parameters in the Sub-Menu Level 2 should be carefully filled in the
SPF-25. Failing to put the correct parameters can make SPF-25 to malfunction.
Its therefore advised that a trained person should only be allowed to change these
values.

- 23 -

Commissioning Instructions :
before panel is powered up for the first time.
1. Panel Wiring Check
Ensure that all connections in the panel is tightened properly and there are no
loose connections. Also ensure that the wiring is done as per the wiring
diagram.
2. Power Wiring Check
Ensure that the power cables are connected properly from the Panel I/C to the
feeder I/C or the transformer bushings. The connection has to be after the
Load Feed back CT looking from the Transformer side.
Ensure that the Bus Bars and/or Lugs are clean and free of Dust, Corrosion or
Oxidation on the contact sides so that good electrical connection is maintained.
The surface area should be flat so as to get maximum contact area.
If required Clean the Bus Bars and/ or Lugs by rubbing it with Polish Paper to
remove the oxidation layer. Provide contact paste in between the contacts
surfaces.
Not performing this, can result in to a weaker source point for Capacitor
charging during Step on and this can generate undesirable Noise which can
hamper the performance of equipments installed in the capacitor panel.
3. Load Feed Back CT connection.
Ensure that the load feed back CT connections are done properly. Confirm that
correct phase CT is connected with the correct phase input terminals. (Even
though auto sync is capable of taking care of wrong CT polarities or CT
position interchanging, but then on display, the Phase readings may be seen to
be interchanged. (May be R-phase reading would be seen in B-phase and
vice-versa.
CT connections to be done carefully so as to ensure that the wire does not get
open and there is no loose connection.

Loose connection’s or open CT secondary can result in to very high voltages
getting developed in the circuit which can damage the CT and also produce
high levels of noise in the system.

- 24 -

Fault Finding Guidelines :

Fault Type

Probable Reason

Action to Take

Unit Does not
turn ON. No
display on LCD.

•Input auxiliary supply
not coming.
•Input side fuses
blown

•Check the input
supply to restore
•Check fuses in the
unit for OK.

Unit does not
turn On any
capacitors even
if PF is below
Lower PF limit.

•If auto-sync failure
message is there at
Power On.

• Load may be highly
fluctuating so need of
manual
synchronisation only.
• This is OK
condition.

• The load KW is too
low with Under load
fault enable condition.
•Control connections
from SPF-25 to
contactor coils are not
proper

•Check control supply
and connections from
SPF-25 to contactors.

BF indication on
Default display.

• Internal Ni-Cd
3.2Vdc battery used
for RTC and NV RAM
must be drained down.

• Replace this battery
in consultancy with
TAS trained
personnel.

Some Capacitor
banks are
declared as
faulty even if
they are
checked to be
OK.

•Individual step health
monitoring is enabled
and tolerance limits
set are too stringent.
• Capacitor current
THD factor is
continuously
fluctuating.

•Set the tolerance
limits for individual
steps monitoring as
relaxed.
• With continuously
fluctuating THD of
Capacitor current and
higher level of THD
can cause some
errors in individual
step KVAR
measurement. Under
this condition, best is
to keep this feature
disabled.

- 25 -

Fault Finding Guidelines (continued):

Fault Type

Probable Reason

Action to Take

Serial
Communication
is not working.

• Baud rate selection
is not proper.
• Unit ID is not set
properly.
• Serial
communication cable
connections are not
proper.

• Select proper baud
rate.
• Set the unit ID
correctly.
• Check the serial
cable continuity as
per the connections
given earlier in this
manual.

Data logging is
not taking place.

• Possible that RTC
date is not set
properly.

• Change the battery
by help of TAS’s
authorised person.

SPF-25 resets
occasionally on
turning OFF of
any contactor.

• The contactor supply
phase may be the
same as used for SPF25 auxiliary supply.
• RC snubbers/ free
wheeling diodes are
not put with contactor
coils.

• Use the different
phase for control
supply of contactors
and for SPF-25 supply
• Usage of RC
snubbers / free
wheeling diodes is
mandatory.

- 26 -

Corporate Office/Works/Design Centre:
W-61, MIDC, Ambad, Nasik - 422010, Maharashtra (India)
Tel: +91-(253)-2384038 / 2381090
Email: [email protected]
Marketing and After-Sales Service:
A/58, Kamal Pushpa, K.C. Road, Bandra, Mumbai-400050.
Tel: +91-9930513923
Email: [email protected]
Regional Office: Delhi
191-B, Ground Floor, Padam Nagar (Filter Market),
New Delhi - 110007 (India).
Tel: +91-9911615701
Email: [email protected]


Slide 18

Operations Manual
SPF-25/6
AUTOMATIC POWER FACTOR
CONTROLLER

TAS Powertek Pvt. Ltd.
Corporate Office:
W-61, MIDC, Ambad, Nasik - 422010, Maharashtra (India)
Tel: +91-(253)-2384038 / 2381090
Email: [email protected]

NOTE
These instructions do not purport to cover all details or
variations in equipment, nor to provide for every possible
contingency to be met in connection with installation,
operation or maintenance.

Should further information be desired or should particular
problems arise which are not covered sufficiently for the
purchasers purposes, the matter should be referred to our
TAS Powertek Pvt. Ltd., office.
The contents of this instruction Manual shall not become
part of or modify any prior or existing agreement or
relationship. The sales contract contains the entire
obligations of TAS Powertek Pvt. Ltd. The warranty
contained in the contract between the parties is the sole
warranty of TAS Powertek Pvt. Ltd. Any statements
contained herein do not create new warranties or modify the
existing warranty.

The reproduction, transmission or use of this
document or its contents is not permitted
without express written authority. Offenders
will be liable for damages. All rights are
reserved.

Index
Index Page
-----------------Features & Specifications
----------Mechanical Dimensions/ mounting --------Functional Block diagram
-----------------PF correction technique
-----------------Back Side terminals
-----------------------Typical wiring scheme ---------------------Front Facia
---------------------------------Communication connector connections ----Display of various parameters / Status ---Method of Keyboard/Display usage -------Parameter Submenu -----------------------Commissioning Instruction (before Powerup)
Fault finding Guidelines ---------------------

-1-

1
2
3
4
5
6
7
8
9
10
19
22
24
25

Features:
• Totally Micro-processor controlled Digital Signal processing
logic for measurements.
• All measurements with 1.0 class accuracy.
• Automatic Synchronisation capable of giving the correct
results for wrong connections at CT terminals (even wrong
polarity of CTs).
• Measurement and kVAr compensation are frequency / THD
compensated.
• Load V,Iph, In and Cap. current THD measurement.
• Up-to 6 output banks control.
• Capable of doing the kVAr measurements on basis of mean
of the correction cycle time and provide kVAr compensation.
• Standard 144 X 144 cabinet for panel door flush mounting.
• Serial communication through standard TAS protocols.
• Manual testing mode for user checking of the Capacitor steps
switching.
• Protections provided (user settable):
Over/under Voltage
Cap. Over/under current / THD.
Over/Under frequency (internally set limits)
Over / Under load.
Load unbalance.
Capacitor individual step kVAr monitoring.
Out of steps: Under-compensation (only for indication)
NV-RAM battery down.
• Data logging for various parameters for 2months period at an
interval of 1hr.
• Unit comes along with PC (Windows compatible) software
for downloading and viewing the logged data.

Specifications:
•
•
•
•
•
•
•
•
•
•
•
•

Feed-back Voltage:440Volt (+10%/-30%)
Current input : 1Amp for load and capacitor feed-back.
Measurement Accuracy: Class 1.0
Auxiliary Supply: 525Vac to 300Vac.
Correction / Discharge time:
Selectable in seconds from 10sec. to 240sec.
Output commands:
NO contacts each with current rating of 0.5Amp AC. at
240Vac.
RS-232 baud rate selectable from 4.8kBPS to 38.4kBPS.
Operating temperature: 0 to 55oC.
1.0class measurement Operating temperature: 0 to 50oC.
Storage temperature: -10 to +75oC.
Humidity: 0 to 98%.
Supply frequency: 45Hz to 55Hz.

-2-

Mechanical Dimensions:
135

144

135

120
144

6

Recommended size for cutout on panel door is 138 X 138.
All Dimensions given are in mm.

Maximum weight: (with clamps and terminals) = 2.5kg.

-3-

Functional Block Diagram:
3 channel
Current f.b.

3
Channel
Cap.
Current
f.b.

3 channel
Voltage f.b.

SPF-25

V, I, PF and Power
Measurement
Block
For every AC mains
Cycle.

Calculation
Block for
• Energy Parameters
• Harmonic analysis

EEPROM
For Data
Logging

Keyboard,
Display and
Other support
Functions
Block.

RS-232 Serial
Communication.
TAS-01
Protocol stack.

Power Factor
Correction Block
+ event monitoring.

Outputs Commands
For Capacitor
Switching.

Power Supply
Block.

Above block diagram gives the functional blocks that are built into SPF-25 PF
correction relay.
These blocks are made up with the combination of functions from hardware and
corresponding firmware that resides in the Program memory of the micro-processor
used therein.
Even though the basic blocks exists as shown in the diagram, there functionality is
interdependent. The entire combination is carefully designed so as to have
minimum effects of Electrical and Electromagnetic noise level on the functionality of
this SPF-25.
The firmware written takes into various error handling eventualities so that the
functioning of this PF relay is error free and highly reliable.

-4-

PF correction technique:
KVAr Inductive

Target
PF.
Cos Φ
= PF

1.5 X kVAr
Of Smallest
Capacitor bank

KW

No change band.
KVAr Capacitive
Capacitor Addition band.
Capacitor Removal band.
SPF-25 for kVAr compensation works with the kW v/s kVAr diagram as shown here
above.
A band is created across the target PF value. (Target PF is set by user). This band
is of +0.75 of the smallest capacitor bank kVAr. Thus, total band width is always 1.5
times the smallest capacitor bank kVAr used. This is a no change band. If the
mains source parameters are within this band, SPF-25 would not change the
capacitors bank status.
If the mains parameters are out of this “No change band”, then SPF-25 calculates
the correct capacitor bank combination to be added / subtracted and within one
correction cycle brings it within the No change band.
The no change band width is selected as mentioned because it has to prevent unnecessary hunting (switching on/off) of the capacitor banks.

-5-

Back Side terminals:

Voltage
Feed-Back

Auxiliary
Supply

Current
Feed-Back
Output commands.

-6-

Capacitor
Current
Feed-Back

Typical Wiring with SPF-25 PF correction system.
L
O
A
D

L
C
R
+

L
C
R
-

L
C
Y
+

L
C
Y
-

L
C
B
+

L
C
B
-

PH 3
PH 2
PH 1
CCR+
CCRCCY+
CCYCCB+
CCB-

S
P
F
2
5

Auxiliary
Supply

L1
L2

Com
C01
C02
|

C06

Mains Connections:
Phase 1 control:
Neutral control:
Commands:
Load Current CT:
Capacitor Current CT:

-7-

Front Facia of SPF-25:
LCD Display

Step status LED indication
Serial Communication Port

Membrane Keypad

Usage of the UP and DN key makes the LCD display to scroll up
and down. This is used for display of various status as well as for
viewing the On line measured electrical values.
These keys are also used for changing values in Parameters
Editing mode and used for status changing of banks in Manual
mode.
Usage of ENT key is for entering the submenu and / or for setting
up some values.
The L and R keys are used in changing the position of the cursor
from Left to Right and vice-versa.

-8-

RS-232 serial communication 9 pin D connector:

5

4

6

3

7

2

8

1

9
RXD

GND

TXD

RS-232 cable connection Details:

PIN
NO

PC side
Connection

CONNECTION

SPF-25

1

NC

2

RXD

TXD

3

TXD

RXD

GND

GND

4
5
6
7
8
9

NC

-9-

Display of Various Parameters / Status:
PAGE: 00

COSΦ= -0.99 A OK

This is default display screen giving
information on PF, mode and
working status.

COSΦ= -0.99 :This part of the display indicates the Power Factor running value. The
sign –ve indicates that PF is Capacitive and no sign (+ve) indicates that PF is Inductive.
The PF indicated is the overall PF of the three phase system.
A or M :
This part either indicates the letter “A” or letter “M”. The letter A means
that SPF-25 is working in Auto mode.
The letter M means that SPF-25 is presently in Manual mode.
The Auto or Manual modes can be selected by pressing ENT key on this page.
(If Password option is enabled, enter the same by using UP/DN/L/R keys and then
Pressing ENT)
Then by UP or DN key you can stroll between the displays:
“1. Edit Mode”, “2. Auto Mode”, “3.Manual Mode”.
The first one “1.Edit Mode” is for parameter changing. The details of parameter changing
are explained in detail in later part of this manual.
The second and third one as display indicates are for selecting Auto or Manual mode
respectively. The ENT key pressed on selecting the mode desired, puts the SPF-25 into
that mode.
Auto Mode: In this mode SPF-25 works in automatic mode. It switches the capacitor
banks automatically depending on the parameter setting of target PF. This mode is the
default mode and is to be used for unmanned operation of the system controlled by
SPF-25.
Manual Mode: This mode is activated for checking/testing the capacitor banks switching.
Its also used for changing the Masking status of the capacitor banks. More on this is
explained later. (On Page 01 explanation)
OK or ** :
The last part of the display that is blinking every 500mS indicates the
working status of SPF-25. “OK” indicates that unit is working fine without any trip
conditions. If there is other indication, the meaning of the same can be as:
OK
:
No Fault
OC
:
Over Capacitor Current
UC
:
Under Capacitor Current
OL
:
Over Load
UL
:
Under Load
OV
:
Over Voltage
UV
:
Under Voltage
OF
:
Over Frequency
UF
:
Under Frequency
OH
:
Over Capacitor Current THD %.
OB
:
Out of Banks
LU
:
Load Unbalance
BF
:
Battery Failure (RTC)
NV
:
NVRAM Checksum Error
VA
:
Voltage Absent
- 10 -

PAGE: 01

PAGE: 01

______

AUTO

______

MAN

This display indicates the Bank status in Auto mode and in Manual mode it helps
to make the specific bank On or Off or declare masked.
: Means Bank is On.
: Means Bank is Off.
: Means Bank is Off and is declared masked (out of action)
: Means Bank does not exist for compensation.
When the Page 01 is in Auto mode, its only for indication of Bank status.
But in Manual mode, the “ENT” key press activates the manual control
mode. The cursor over the bank number starts blinking. The UP and DN
keys can turn On and Off the respective bank.
The DN key pressed puts the respective bank in Masking mode and another
press of DN key brings it out of Masking mode.

Putting the bank masking status permanently:
If a bank is to be permanently put in masked mode or is to be brought out of
permanent masked mode, it can be done by bringing the blinking cursor on
the position of the respective bank by use of L or R key. Then by pressing
DN key, bring the status of the bank to the required level (Masked or
Unmasked). Then press ENT key so that cursor stops blinking. After that by
pressing UP key go to Page 00. Then Press ENT. (If Password option is
enabled, enter the same by using UP/DN/L/R keys and then Press ENT)
“1.EDIT MODE” would be displayed. Press ENT one more time. “1.General
and IO” would be displayed. Press ENT again. “Pwd : Disable” or “Pwd :
Enable” would be displayed. Press UP key. “Exit: No Save” would be
displayed. Press ENT so that cursor will start blinking. Press UP. “Exit: With
Save” would be displayed with cursor blinking. Press ENT. “Saving in
EEPROM” would be displayed for a short time and then Page 00 would be
displayed.
You will observe that the bank status as requirement is changed
permanently to the status desired.

- 11 -

PAGE: 02

1.Overall Values
PRESS
PAGE: 02.1

Avg Vol: 415.7 V
PAGE: 02.2

Avg Cur: 0123.4A
PAGE: 02.3

Tot KW:

0081.2

PAGE: 02.4

TotKVAR: 0024.6
PAGE: 02.5

Tot KVA: 0101.1
PAGE: 02.6

Avg CC:

0031.3A

PAGE: 02.7

CKVAR:

028.35

PAGE: 02.8

LS PF:

0.82

PAGE: 02.9

LS KVAR: 0043.9
PAGE: 02.10

LS KVA:

0125.7

PAGE: 02.11

Freq:

49.9Hz

The Overall values Display menu has submenus as displayed above. As its
self explanatory it means:
Avg Vol: Average voltage of all the three line to line voltage values.
Avg Cur: Average current of all the three phase line current values.
Tot KW: Overall kW of the three phase system measured at source.
TotKVAR: Overall kVAr of the three phase system measured at source.
Tot KVA: Overall kVA of the three phase system measured at source.
Avg CC: Average of three phase current through capacitor panel.
CKVAR: Capacitive kVAr that is compensated by the system.
LS PF: Load side PF. (PF value if not compensated.
LS KVAR: Load side kVAr.
LS KVA: Load side kVA.
Freq: Supply frequency in Hz.
- 12 -

PAGE: 03

2.Per-Phase RMS

PRESS
PAGE: 03.1

R-Y Vol: 415.7 V
PAGE: 03.2

Y-B Vol: 415.7 V
PAGE: 03.3

B-R Vol: 415.7 V
PAGE: 03.4

Rph Cur: 0110.8A
PAGE: 03.5

Yph Cur: 0110.8A
PAGE: 03.6

Bph Cur: 0110.8A
PAGE: 03.7

Neutral: 0010.2A
PAGE: 03.8

Rph Cap: 0022.5A
PAGE: 03.9

Yph Cap: 0022.5A
PAGE: 03.10

Bph Cap: 0022.5A

Per Phase RMS: Submenu:
R-Y Vol: Measured AC Voltage RMS value across R and Y phase.
Y-B Vol: Measured AC Voltage RMS value across Y and B phase.
B-R Vol: Measured AC Voltage RMS value across B and R phase.
Rph Cur: Line current RMS value in R phase. Mains source.
Yph Cur: Line current RMS value in Y phase. Mains source.
Bph Cur: Line current RMS value in B phase. Mains source.
Neutral: Neutral current RMS value.
Rph Cap: Capacitor current RMS value in R phase.
Yph Cap: Capacitor current RMS value in Y phase.
Bph Cap: Capacitor current RMS value in B phase.

- 13 -

PAGE: 04

3.Power
PRESS
PAGE: 04.1

Rph PF:

PAGE: 04.10

1.00

Rph KVA: 0109.7

PAGE: 04.2

Yph PF:

PAGE: 04.11

1.00

Yph KVA: 0109.7

PAGE: 04.3

Bph PF:

PAGE: 04.12

1.00

Bph KVA: 0109.7

PAGE: 04.4

Rph KW:

PAGE: 04.13

0100.2

RphCKVAR: 010.76

PAGE: 04.5

Yph KW:

PAGE: 04.14

0100.2

YphCKVAR: 010.76

PAGE: 04.6

Bph KW:

PAGE: 04.15

0100.2

BphCKVAR: 010.76

PAGE: 04.7

PAGE: 04.16

RphKVAR: 0020.4

Rph mF

PAGE: 04.8

: 165.06

PAGE: 04.17

YphKVAR: 0020.4

Yph mF

PAGE: 04.9

: 165.06

PAGE: 04.18

BphKVAR: 0020.4

Bph mF

: 165.06

Power: Submenu:
Rph PF: Power Factor of R phase on mains source.
Yph PF: Power Factor of Y phase on mains source.
Bph PF: Power Factor of B phase on mains source.
Rph kW: Active Power in kW in R-phase.
Yph kW: Active Power in kW in Y-phase.
Bph kW: Active Power in kW in B-phase.
RphkVAR: Reactive Power in kVAr in R-phase.
YphkVAR: Reactive Power in kVAr in Y-phase.
BphkVAR: Reactive Power in kVAr in B-phase.
Rph KVA: Apparent Power in kVA in R-phase.
Yph KVA: Apparent Power in kVA in Y-phase.
Bph KVA: Apparent Power in kVA in B-phase.
RphCKVAR: Capacitor injected reactive power in R-phase.
YphCKVAR: Capacitor injected reactive power in Y-phase.
BphCKVAR: Capacitor injected reactive power in B-phase.
Rph mF: Capacitor value in micro-farad in R-phase.
Yph mF: Capacitor value in micro-farad in Y-phase.
Bph mF: Capacitor value in micro-farad in B-phase.
- 14 -

PAGE: 05

4.Energy
PRESS
PAGE: 05.1

KWH:

1234567.8

PAGE: 05.2

IndKVARH:12345.6
PAGE: 05.3

CapKVARH:12345.6
PAGE: 05.4

KVAH:

1234567.8

PAGE: 05.5

CKVARH:1234567.8

Energy: Submenu:
KWH: Overall cumulative active energy in kWh on Mains supply.
IndKVARH: Inductive reactive energy in kVArh on Mains supply.
CapKVARH: Capacitive reactive energy in kVArh on Mains supply.
KVAH: Overall cumulative apparent energy in kVA on Mains supply.
CKVARH: Capacitor compensated reactive energy in kVArh.

- 15 -

PAGE: 06

5.Harmonics
PRESS
PAGE: 06.1

Vr-THD-F: 002.4%
PAGE: 06.2

Vy-THD-F: 002.4%
PAGE: 06.3

Vb-THD-F: 002.4%
PAGE: 06.4

Ir-THD-F: 012.5%
PAGE: 06.5

Iy-THD-F: 012.5%
PAGE: 06.6

Ib-THD-F: 012.5%
PAGE: 06.7

In-THD-F: 005.0%
PAGE: 06.8

CCr-THD-F:028.2%
PAGE: 06.9

CCy-THD-F:028.2%
PAGE: 06.10

CCb-THD-F:028.2%

Harmonics: Submenu:
Vr-THD-F/R: R-Y line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Vy-THD-F/R: Y-B line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Vb-THD-F/R: B-R line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Ir-THD-F/R: R phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Iy-THD-F/R: Y phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Ib-THD-F/R: B phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
In-THD-F/R: Neutral current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
CCr-THD-F/R: R phase Capacitor current % Total Harmonic Distortion.
CCy-THD-F/R: Y phase Capacitor current % Total Harmonic Distortion.
CCb-THD-F/R: B phase Capacitor current % Total Harmonic Distortion.

- 16 -

PAGE: 07

6.Step KVAR
PRESS
PAGE: 07.1

Stp1 KVAR:0009.0
PAGE: 07.2

Stp2 KVAR:0009.0
PAGE: 07.3

Stp3 KVAR:0009.0
PAGE: 07.4

Stp4 KVAR:0009.0
PAGE: 07.5

Stp5 KVAR:0009.0
PAGE: 07.6

Stp6 KVAR:0009.0

Step KVAR: Submenu:
Stp1 KVAR: Step 1 kVAr value normalized at Capacitor rated voltage.
Stp2 KVAR: Step 2 kVAr value normalized at Capacitor rated voltage.
Stp3 KVAR: Step 3 kVAr value normalized at Capacitor rated voltage.
Stp4 KVAR: Step 4 kVAr value normalized at Capacitor rated voltage.
Stp5 KVAR: Step 5 kVAr value normalized at Capacitor rated voltage.
Stp6 KVAR: Step 6 kVAr value normalized at Capacitor rated voltage.

- 17 -

PAGE: 08

Time: 10:10:00
Real Time Clock: RTC time set in the SPF-25 is displayed here. Its in
HH:MM:SS format.

PAGE: 09

Date: 07:11:06
Real Time Clock: RTC date set in the SPF-25 is displayed here. Its in
dd:mm:yy format.

PAGE: 10

SPF-25 1.0.6

SPF-25 internal firmware version number is displayed here. (Just for user
information)

Total number of Main display pages are 11nos ranging from “00” to
“10”.

- 18 -

Method for Keyboard/Display usage.

Flow chart for entering into different modes:

PRESS
Enable

Default
Display
mode

If Password
Option is
Enable/Disable.

Disable

Enter Pwd: ****
PRESS
Enter the 4
Digit password
By use of
L, R, UP & DN
Keys.

PRESS

NO

IF
PASSWORD
Correct?

*

YES
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

1.Edit Mode

2.Auto Mode

3.Manual Mode

- 19 -

Parameter Editing Submenu Level 1:

*
1.General
2.System
3.Fault
4.Step
5.Communication

Sub-menu
Level 1
for
Parameter
Editing.

Parameter Editing
Sub-Menu
LEVEL 2

1.General and IO: Parameters related with general function and Input/Output
2. System: Electrical system (Mains supply) related parameters.

3. Fault: Setting Faults and fault levels.
4. Step: Capacitor Steps related parameters.
5. Communication: Parameters related with communication and data logging.

- 20 -

Parameter Editing Method:
(For Submenu Level 2 : L2)

Sub-Menu Level 1.
Cursor Blinking
at Parameter Values.

1.Submenu L2: ****

1.Submenu L2: ****
PRESS

key to increment value.

PRESS

Key to decrement value.

PRESS

Key to shift cursor Left.

PRESS

Key to shift cursor Right.
2.Submenu L2: ****

2.Submenu L2: ****
PRESS

key to increment value.

PRESS

Key to decrement value.

PRESS

Key to shift cursor Left.

PRESS

Key to shift cursor Right.

3.Submenu L2: ****

Exit: No Save

Exit: No Save

Without saving

Default
Display.

With saving

Screen for 1second

Saving In EEProm

Exit: With Save

- 21 -

Parameter Editing Submenu Level 2:
Menu
General

Parameter
Pwd
Ch-Pwd
Ld Def
THD
Rst. Energy

Meaning of Parameter
Password Control
Password value
Load all factory default parameters.
Type of THD factor to be displayed
Energy Counters reset to zero option

Default
Enable
1111
No
F-THD
No

Menu
System

Parameter
Meas. Vol.
Ld. Cur. Pr.
Cap. Cur. Pr.
PF Target
PF Target
Auto Sync
Async Tol.
Reset Async

Meaning of Parameter
Default
SPF-25 rated measurement voltage
440
Primary current value of mains CT
0180
0075
Primary current value of capacitor CT
Target PF for deciding Lag or Lead
Lag
1.00
Target PF exact value
Automatic synchronisation requirement Yes
% load variation tolerence for Auto-sync. 30
No
Reset Auto-sync to default value.

Menu
Fault

Parameter
Over Vol.
Over Vol. Lim
Over Vol. Clr
Under Vol.
Under Vol. Lim
Under Vol. Clr
Over Load
Over Ld. Lim
Over Ld. Clr
Under Ld.
Under Ld. Lim
Under Ld. Clr
Ld. Unbalance
Ld. Unb. Lim
Over CC
Over CC. Lim
Over CC. Clr
Over CC. Rst.
Over CC. Rst.
Under CC.
Under CC. Lim
Under CC. CLr
CC THD
CC THD Lim
CC THD Clr
Step Check
Cap. Cur Tol
Under Comp.
RTC Bat

Meaning of Parameter
Default
Over Voltage Fault: action by PDE-30 Off Step
Over Voltage activation limit value
1.10
Over Voltage resumption limit value 1.05
Under Voltage Fault: Action?
Off Step
Under Voltage activation limit value 0.70
Under Voltage resumption limit value 0.75
Over Load Fault: Action?
Indicate
Mains current over load limit value
1.30
Mains cur. over load resume value
1.25
Under Load on Mains: Action?
Indicate
Under load Activation limit value
0.03
Under load Resumption limit value
0.05
Load Un-balance Fault: Action?
Off Step
Load Un-balance limit
025%
Capacitor Over Current Fault: Action? Disable
Cap. Over Current Limit value.
1.30
Cap. Over Current Resume value.
1.25
Auto reset feature on Cap. Over Cur. No
If Over CC. Rst.=Yes. Time for reset. 120 sec
Under Capacitor current fault: Action? Disable
Under Cap. Cur. Limit value.
0.95
Under Cap. Cur. Resume value.
0.97
Capacitor current Over THD: Action? Disable
Cap.Cur. Over THD limit value.
0.10
Cap.Cur. Over THD resume value.
0.08
Every step kVAr healthiness monitor. Disable
Step kVAr healthiness: tolerence.
0.10
Out of Banks Indication.
Disable
RTC Battery fault monitoring.
Enable

- 22 -

Min
Disable
0000
No
R-THD
No
Min
Non
0001
0001
Lead
0.70Lag
No
01
No

Min

Max
Enable
9999
Yes
F-THD
Yes
Max
Edible
9999
9999
Lag
0.85Lead
Yes
50
Yes

Max

Disable, Indicative, Off Step

0.90
0.85

1.20
1.15

Disable, Indicative, Off Step

0.70
0.75

0.95
1.00

Disable, Indicative, Off Step

1.10
1.05

1.30
1.25

Disable, Indicative, Off Step

0.01
0.02

0.20
0.25

Disable, Indicative, Off Step

005%

100%

Disable, Indicative, Off Step

1.05
1.00
No
15

1.50
1.45
Yes
900

Disable, Indicative, Off Step

0.75
0.80

0.98
1.00

Disable, Indicative, Off Step

0.02
0.01
Disable
0.03
Disable
Disable

0.99
0.90
Enable
0.50
Enable
Enable

Menu
Step

Parameter
No. of Steps
Step Vol
Corr. Time
Discharge Time
Step 1 KVAR
Step 2 KVAR
Step 3 KVAR
Step 4 KVAR
Step 5 KVAR
Step 6 KVAR

Meaning of Parameter
Number of Capacitor steps utilised
Voltage at which kVAr is defined
Correction cycle time.
Capacitor discharge time.
Step 1 kVAr value.
Step 2 kVAr value.
Step 3 kVAr value.
Step 4 kVAr value.
Step 5 kVAr value.
Step 6 kVAr value.

Menu
Parameter
Meaning of Parameter
Communication Unit ID
Communication ID of the unit
Baud Rate
Serial communication baud rate.
Time
RTC time to be set
Date
RTC date to be set
Init RTC
Initialise RTC?
Clear NVRAM Clear all contents on NV RAM?

Default
3
440
120 secs
120 secs
006
009
018
018
018
018

Min
1
380
010
010
001
001
001
001
001
001

Default
3001
09600
--No
No

Min
0000
04800
--No
No

Max
6
660
240
240
250
250
250
250
250
250

Max
9999
38400
--Yes
Yes

Note that all the parameters in the Sub-Menu Level 2 should be carefully filled in the
SPF-25. Failing to put the correct parameters can make SPF-25 to malfunction.
Its therefore advised that a trained person should only be allowed to change these
values.

- 23 -

Commissioning Instructions :
before panel is powered up for the first time.
1. Panel Wiring Check
Ensure that all connections in the panel is tightened properly and there are no
loose connections. Also ensure that the wiring is done as per the wiring
diagram.
2. Power Wiring Check
Ensure that the power cables are connected properly from the Panel I/C to the
feeder I/C or the transformer bushings. The connection has to be after the
Load Feed back CT looking from the Transformer side.
Ensure that the Bus Bars and/or Lugs are clean and free of Dust, Corrosion or
Oxidation on the contact sides so that good electrical connection is maintained.
The surface area should be flat so as to get maximum contact area.
If required Clean the Bus Bars and/ or Lugs by rubbing it with Polish Paper to
remove the oxidation layer. Provide contact paste in between the contacts
surfaces.
Not performing this, can result in to a weaker source point for Capacitor
charging during Step on and this can generate undesirable Noise which can
hamper the performance of equipments installed in the capacitor panel.
3. Load Feed Back CT connection.
Ensure that the load feed back CT connections are done properly. Confirm that
correct phase CT is connected with the correct phase input terminals. (Even
though auto sync is capable of taking care of wrong CT polarities or CT
position interchanging, but then on display, the Phase readings may be seen to
be interchanged. (May be R-phase reading would be seen in B-phase and
vice-versa.
CT connections to be done carefully so as to ensure that the wire does not get
open and there is no loose connection.

Loose connection’s or open CT secondary can result in to very high voltages
getting developed in the circuit which can damage the CT and also produce
high levels of noise in the system.

- 24 -

Fault Finding Guidelines :

Fault Type

Probable Reason

Action to Take

Unit Does not
turn ON. No
display on LCD.

•Input auxiliary supply
not coming.
•Input side fuses
blown

•Check the input
supply to restore
•Check fuses in the
unit for OK.

Unit does not
turn On any
capacitors even
if PF is below
Lower PF limit.

•If auto-sync failure
message is there at
Power On.

• Load may be highly
fluctuating so need of
manual
synchronisation only.
• This is OK
condition.

• The load KW is too
low with Under load
fault enable condition.
•Control connections
from SPF-25 to
contactor coils are not
proper

•Check control supply
and connections from
SPF-25 to contactors.

BF indication on
Default display.

• Internal Ni-Cd
3.2Vdc battery used
for RTC and NV RAM
must be drained down.

• Replace this battery
in consultancy with
TAS trained
personnel.

Some Capacitor
banks are
declared as
faulty even if
they are
checked to be
OK.

•Individual step health
monitoring is enabled
and tolerance limits
set are too stringent.
• Capacitor current
THD factor is
continuously
fluctuating.

•Set the tolerance
limits for individual
steps monitoring as
relaxed.
• With continuously
fluctuating THD of
Capacitor current and
higher level of THD
can cause some
errors in individual
step KVAR
measurement. Under
this condition, best is
to keep this feature
disabled.

- 25 -

Fault Finding Guidelines (continued):

Fault Type

Probable Reason

Action to Take

Serial
Communication
is not working.

• Baud rate selection
is not proper.
• Unit ID is not set
properly.
• Serial
communication cable
connections are not
proper.

• Select proper baud
rate.
• Set the unit ID
correctly.
• Check the serial
cable continuity as
per the connections
given earlier in this
manual.

Data logging is
not taking place.

• Possible that RTC
date is not set
properly.

• Change the battery
by help of TAS’s
authorised person.

SPF-25 resets
occasionally on
turning OFF of
any contactor.

• The contactor supply
phase may be the
same as used for SPF25 auxiliary supply.
• RC snubbers/ free
wheeling diodes are
not put with contactor
coils.

• Use the different
phase for control
supply of contactors
and for SPF-25 supply
• Usage of RC
snubbers / free
wheeling diodes is
mandatory.

- 26 -

Corporate Office/Works/Design Centre:
W-61, MIDC, Ambad, Nasik - 422010, Maharashtra (India)
Tel: +91-(253)-2384038 / 2381090
Email: [email protected]
Marketing and After-Sales Service:
A/58, Kamal Pushpa, K.C. Road, Bandra, Mumbai-400050.
Tel: +91-9930513923
Email: [email protected]
Regional Office: Delhi
191-B, Ground Floor, Padam Nagar (Filter Market),
New Delhi - 110007 (India).
Tel: +91-9911615701
Email: [email protected]


Slide 19

Operations Manual
SPF-25/6
AUTOMATIC POWER FACTOR
CONTROLLER

TAS Powertek Pvt. Ltd.
Corporate Office:
W-61, MIDC, Ambad, Nasik - 422010, Maharashtra (India)
Tel: +91-(253)-2384038 / 2381090
Email: [email protected]

NOTE
These instructions do not purport to cover all details or
variations in equipment, nor to provide for every possible
contingency to be met in connection with installation,
operation or maintenance.

Should further information be desired or should particular
problems arise which are not covered sufficiently for the
purchasers purposes, the matter should be referred to our
TAS Powertek Pvt. Ltd., office.
The contents of this instruction Manual shall not become
part of or modify any prior or existing agreement or
relationship. The sales contract contains the entire
obligations of TAS Powertek Pvt. Ltd. The warranty
contained in the contract between the parties is the sole
warranty of TAS Powertek Pvt. Ltd. Any statements
contained herein do not create new warranties or modify the
existing warranty.

The reproduction, transmission or use of this
document or its contents is not permitted
without express written authority. Offenders
will be liable for damages. All rights are
reserved.

Index
Index Page
-----------------Features & Specifications
----------Mechanical Dimensions/ mounting --------Functional Block diagram
-----------------PF correction technique
-----------------Back Side terminals
-----------------------Typical wiring scheme ---------------------Front Facia
---------------------------------Communication connector connections ----Display of various parameters / Status ---Method of Keyboard/Display usage -------Parameter Submenu -----------------------Commissioning Instruction (before Powerup)
Fault finding Guidelines ---------------------

-1-

1
2
3
4
5
6
7
8
9
10
19
22
24
25

Features:
• Totally Micro-processor controlled Digital Signal processing
logic for measurements.
• All measurements with 1.0 class accuracy.
• Automatic Synchronisation capable of giving the correct
results for wrong connections at CT terminals (even wrong
polarity of CTs).
• Measurement and kVAr compensation are frequency / THD
compensated.
• Load V,Iph, In and Cap. current THD measurement.
• Up-to 6 output banks control.
• Capable of doing the kVAr measurements on basis of mean
of the correction cycle time and provide kVAr compensation.
• Standard 144 X 144 cabinet for panel door flush mounting.
• Serial communication through standard TAS protocols.
• Manual testing mode for user checking of the Capacitor steps
switching.
• Protections provided (user settable):
Over/under Voltage
Cap. Over/under current / THD.
Over/Under frequency (internally set limits)
Over / Under load.
Load unbalance.
Capacitor individual step kVAr monitoring.
Out of steps: Under-compensation (only for indication)
NV-RAM battery down.
• Data logging for various parameters for 2months period at an
interval of 1hr.
• Unit comes along with PC (Windows compatible) software
for downloading and viewing the logged data.

Specifications:
•
•
•
•
•
•
•
•
•
•
•
•

Feed-back Voltage:440Volt (+10%/-30%)
Current input : 1Amp for load and capacitor feed-back.
Measurement Accuracy: Class 1.0
Auxiliary Supply: 525Vac to 300Vac.
Correction / Discharge time:
Selectable in seconds from 10sec. to 240sec.
Output commands:
NO contacts each with current rating of 0.5Amp AC. at
240Vac.
RS-232 baud rate selectable from 4.8kBPS to 38.4kBPS.
Operating temperature: 0 to 55oC.
1.0class measurement Operating temperature: 0 to 50oC.
Storage temperature: -10 to +75oC.
Humidity: 0 to 98%.
Supply frequency: 45Hz to 55Hz.

-2-

Mechanical Dimensions:
135

144

135

120
144

6

Recommended size for cutout on panel door is 138 X 138.
All Dimensions given are in mm.

Maximum weight: (with clamps and terminals) = 2.5kg.

-3-

Functional Block Diagram:
3 channel
Current f.b.

3
Channel
Cap.
Current
f.b.

3 channel
Voltage f.b.

SPF-25

V, I, PF and Power
Measurement
Block
For every AC mains
Cycle.

Calculation
Block for
• Energy Parameters
• Harmonic analysis

EEPROM
For Data
Logging

Keyboard,
Display and
Other support
Functions
Block.

RS-232 Serial
Communication.
TAS-01
Protocol stack.

Power Factor
Correction Block
+ event monitoring.

Outputs Commands
For Capacitor
Switching.

Power Supply
Block.

Above block diagram gives the functional blocks that are built into SPF-25 PF
correction relay.
These blocks are made up with the combination of functions from hardware and
corresponding firmware that resides in the Program memory of the micro-processor
used therein.
Even though the basic blocks exists as shown in the diagram, there functionality is
interdependent. The entire combination is carefully designed so as to have
minimum effects of Electrical and Electromagnetic noise level on the functionality of
this SPF-25.
The firmware written takes into various error handling eventualities so that the
functioning of this PF relay is error free and highly reliable.

-4-

PF correction technique:
KVAr Inductive

Target
PF.
Cos Φ
= PF

1.5 X kVAr
Of Smallest
Capacitor bank

KW

No change band.
KVAr Capacitive
Capacitor Addition band.
Capacitor Removal band.
SPF-25 for kVAr compensation works with the kW v/s kVAr diagram as shown here
above.
A band is created across the target PF value. (Target PF is set by user). This band
is of +0.75 of the smallest capacitor bank kVAr. Thus, total band width is always 1.5
times the smallest capacitor bank kVAr used. This is a no change band. If the
mains source parameters are within this band, SPF-25 would not change the
capacitors bank status.
If the mains parameters are out of this “No change band”, then SPF-25 calculates
the correct capacitor bank combination to be added / subtracted and within one
correction cycle brings it within the No change band.
The no change band width is selected as mentioned because it has to prevent unnecessary hunting (switching on/off) of the capacitor banks.

-5-

Back Side terminals:

Voltage
Feed-Back

Auxiliary
Supply

Current
Feed-Back
Output commands.

-6-

Capacitor
Current
Feed-Back

Typical Wiring with SPF-25 PF correction system.
L
O
A
D

L
C
R
+

L
C
R
-

L
C
Y
+

L
C
Y
-

L
C
B
+

L
C
B
-

PH 3
PH 2
PH 1
CCR+
CCRCCY+
CCYCCB+
CCB-

S
P
F
2
5

Auxiliary
Supply

L1
L2

Com
C01
C02
|

C06

Mains Connections:
Phase 1 control:
Neutral control:
Commands:
Load Current CT:
Capacitor Current CT:

-7-

Front Facia of SPF-25:
LCD Display

Step status LED indication
Serial Communication Port

Membrane Keypad

Usage of the UP and DN key makes the LCD display to scroll up
and down. This is used for display of various status as well as for
viewing the On line measured electrical values.
These keys are also used for changing values in Parameters
Editing mode and used for status changing of banks in Manual
mode.
Usage of ENT key is for entering the submenu and / or for setting
up some values.
The L and R keys are used in changing the position of the cursor
from Left to Right and vice-versa.

-8-

RS-232 serial communication 9 pin D connector:

5

4

6

3

7

2

8

1

9
RXD

GND

TXD

RS-232 cable connection Details:

PIN
NO

PC side
Connection

CONNECTION

SPF-25

1

NC

2

RXD

TXD

3

TXD

RXD

GND

GND

4
5
6
7
8
9

NC

-9-

Display of Various Parameters / Status:
PAGE: 00

COSΦ= -0.99 A OK

This is default display screen giving
information on PF, mode and
working status.

COSΦ= -0.99 :This part of the display indicates the Power Factor running value. The
sign –ve indicates that PF is Capacitive and no sign (+ve) indicates that PF is Inductive.
The PF indicated is the overall PF of the three phase system.
A or M :
This part either indicates the letter “A” or letter “M”. The letter A means
that SPF-25 is working in Auto mode.
The letter M means that SPF-25 is presently in Manual mode.
The Auto or Manual modes can be selected by pressing ENT key on this page.
(If Password option is enabled, enter the same by using UP/DN/L/R keys and then
Pressing ENT)
Then by UP or DN key you can stroll between the displays:
“1. Edit Mode”, “2. Auto Mode”, “3.Manual Mode”.
The first one “1.Edit Mode” is for parameter changing. The details of parameter changing
are explained in detail in later part of this manual.
The second and third one as display indicates are for selecting Auto or Manual mode
respectively. The ENT key pressed on selecting the mode desired, puts the SPF-25 into
that mode.
Auto Mode: In this mode SPF-25 works in automatic mode. It switches the capacitor
banks automatically depending on the parameter setting of target PF. This mode is the
default mode and is to be used for unmanned operation of the system controlled by
SPF-25.
Manual Mode: This mode is activated for checking/testing the capacitor banks switching.
Its also used for changing the Masking status of the capacitor banks. More on this is
explained later. (On Page 01 explanation)
OK or ** :
The last part of the display that is blinking every 500mS indicates the
working status of SPF-25. “OK” indicates that unit is working fine without any trip
conditions. If there is other indication, the meaning of the same can be as:
OK
:
No Fault
OC
:
Over Capacitor Current
UC
:
Under Capacitor Current
OL
:
Over Load
UL
:
Under Load
OV
:
Over Voltage
UV
:
Under Voltage
OF
:
Over Frequency
UF
:
Under Frequency
OH
:
Over Capacitor Current THD %.
OB
:
Out of Banks
LU
:
Load Unbalance
BF
:
Battery Failure (RTC)
NV
:
NVRAM Checksum Error
VA
:
Voltage Absent
- 10 -

PAGE: 01

PAGE: 01

______

AUTO

______

MAN

This display indicates the Bank status in Auto mode and in Manual mode it helps
to make the specific bank On or Off or declare masked.
: Means Bank is On.
: Means Bank is Off.
: Means Bank is Off and is declared masked (out of action)
: Means Bank does not exist for compensation.
When the Page 01 is in Auto mode, its only for indication of Bank status.
But in Manual mode, the “ENT” key press activates the manual control
mode. The cursor over the bank number starts blinking. The UP and DN
keys can turn On and Off the respective bank.
The DN key pressed puts the respective bank in Masking mode and another
press of DN key brings it out of Masking mode.

Putting the bank masking status permanently:
If a bank is to be permanently put in masked mode or is to be brought out of
permanent masked mode, it can be done by bringing the blinking cursor on
the position of the respective bank by use of L or R key. Then by pressing
DN key, bring the status of the bank to the required level (Masked or
Unmasked). Then press ENT key so that cursor stops blinking. After that by
pressing UP key go to Page 00. Then Press ENT. (If Password option is
enabled, enter the same by using UP/DN/L/R keys and then Press ENT)
“1.EDIT MODE” would be displayed. Press ENT one more time. “1.General
and IO” would be displayed. Press ENT again. “Pwd : Disable” or “Pwd :
Enable” would be displayed. Press UP key. “Exit: No Save” would be
displayed. Press ENT so that cursor will start blinking. Press UP. “Exit: With
Save” would be displayed with cursor blinking. Press ENT. “Saving in
EEPROM” would be displayed for a short time and then Page 00 would be
displayed.
You will observe that the bank status as requirement is changed
permanently to the status desired.

- 11 -

PAGE: 02

1.Overall Values
PRESS
PAGE: 02.1

Avg Vol: 415.7 V
PAGE: 02.2

Avg Cur: 0123.4A
PAGE: 02.3

Tot KW:

0081.2

PAGE: 02.4

TotKVAR: 0024.6
PAGE: 02.5

Tot KVA: 0101.1
PAGE: 02.6

Avg CC:

0031.3A

PAGE: 02.7

CKVAR:

028.35

PAGE: 02.8

LS PF:

0.82

PAGE: 02.9

LS KVAR: 0043.9
PAGE: 02.10

LS KVA:

0125.7

PAGE: 02.11

Freq:

49.9Hz

The Overall values Display menu has submenus as displayed above. As its
self explanatory it means:
Avg Vol: Average voltage of all the three line to line voltage values.
Avg Cur: Average current of all the three phase line current values.
Tot KW: Overall kW of the three phase system measured at source.
TotKVAR: Overall kVAr of the three phase system measured at source.
Tot KVA: Overall kVA of the three phase system measured at source.
Avg CC: Average of three phase current through capacitor panel.
CKVAR: Capacitive kVAr that is compensated by the system.
LS PF: Load side PF. (PF value if not compensated.
LS KVAR: Load side kVAr.
LS KVA: Load side kVA.
Freq: Supply frequency in Hz.
- 12 -

PAGE: 03

2.Per-Phase RMS

PRESS
PAGE: 03.1

R-Y Vol: 415.7 V
PAGE: 03.2

Y-B Vol: 415.7 V
PAGE: 03.3

B-R Vol: 415.7 V
PAGE: 03.4

Rph Cur: 0110.8A
PAGE: 03.5

Yph Cur: 0110.8A
PAGE: 03.6

Bph Cur: 0110.8A
PAGE: 03.7

Neutral: 0010.2A
PAGE: 03.8

Rph Cap: 0022.5A
PAGE: 03.9

Yph Cap: 0022.5A
PAGE: 03.10

Bph Cap: 0022.5A

Per Phase RMS: Submenu:
R-Y Vol: Measured AC Voltage RMS value across R and Y phase.
Y-B Vol: Measured AC Voltage RMS value across Y and B phase.
B-R Vol: Measured AC Voltage RMS value across B and R phase.
Rph Cur: Line current RMS value in R phase. Mains source.
Yph Cur: Line current RMS value in Y phase. Mains source.
Bph Cur: Line current RMS value in B phase. Mains source.
Neutral: Neutral current RMS value.
Rph Cap: Capacitor current RMS value in R phase.
Yph Cap: Capacitor current RMS value in Y phase.
Bph Cap: Capacitor current RMS value in B phase.

- 13 -

PAGE: 04

3.Power
PRESS
PAGE: 04.1

Rph PF:

PAGE: 04.10

1.00

Rph KVA: 0109.7

PAGE: 04.2

Yph PF:

PAGE: 04.11

1.00

Yph KVA: 0109.7

PAGE: 04.3

Bph PF:

PAGE: 04.12

1.00

Bph KVA: 0109.7

PAGE: 04.4

Rph KW:

PAGE: 04.13

0100.2

RphCKVAR: 010.76

PAGE: 04.5

Yph KW:

PAGE: 04.14

0100.2

YphCKVAR: 010.76

PAGE: 04.6

Bph KW:

PAGE: 04.15

0100.2

BphCKVAR: 010.76

PAGE: 04.7

PAGE: 04.16

RphKVAR: 0020.4

Rph mF

PAGE: 04.8

: 165.06

PAGE: 04.17

YphKVAR: 0020.4

Yph mF

PAGE: 04.9

: 165.06

PAGE: 04.18

BphKVAR: 0020.4

Bph mF

: 165.06

Power: Submenu:
Rph PF: Power Factor of R phase on mains source.
Yph PF: Power Factor of Y phase on mains source.
Bph PF: Power Factor of B phase on mains source.
Rph kW: Active Power in kW in R-phase.
Yph kW: Active Power in kW in Y-phase.
Bph kW: Active Power in kW in B-phase.
RphkVAR: Reactive Power in kVAr in R-phase.
YphkVAR: Reactive Power in kVAr in Y-phase.
BphkVAR: Reactive Power in kVAr in B-phase.
Rph KVA: Apparent Power in kVA in R-phase.
Yph KVA: Apparent Power in kVA in Y-phase.
Bph KVA: Apparent Power in kVA in B-phase.
RphCKVAR: Capacitor injected reactive power in R-phase.
YphCKVAR: Capacitor injected reactive power in Y-phase.
BphCKVAR: Capacitor injected reactive power in B-phase.
Rph mF: Capacitor value in micro-farad in R-phase.
Yph mF: Capacitor value in micro-farad in Y-phase.
Bph mF: Capacitor value in micro-farad in B-phase.
- 14 -

PAGE: 05

4.Energy
PRESS
PAGE: 05.1

KWH:

1234567.8

PAGE: 05.2

IndKVARH:12345.6
PAGE: 05.3

CapKVARH:12345.6
PAGE: 05.4

KVAH:

1234567.8

PAGE: 05.5

CKVARH:1234567.8

Energy: Submenu:
KWH: Overall cumulative active energy in kWh on Mains supply.
IndKVARH: Inductive reactive energy in kVArh on Mains supply.
CapKVARH: Capacitive reactive energy in kVArh on Mains supply.
KVAH: Overall cumulative apparent energy in kVA on Mains supply.
CKVARH: Capacitor compensated reactive energy in kVArh.

- 15 -

PAGE: 06

5.Harmonics
PRESS
PAGE: 06.1

Vr-THD-F: 002.4%
PAGE: 06.2

Vy-THD-F: 002.4%
PAGE: 06.3

Vb-THD-F: 002.4%
PAGE: 06.4

Ir-THD-F: 012.5%
PAGE: 06.5

Iy-THD-F: 012.5%
PAGE: 06.6

Ib-THD-F: 012.5%
PAGE: 06.7

In-THD-F: 005.0%
PAGE: 06.8

CCr-THD-F:028.2%
PAGE: 06.9

CCy-THD-F:028.2%
PAGE: 06.10

CCb-THD-F:028.2%

Harmonics: Submenu:
Vr-THD-F/R: R-Y line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Vy-THD-F/R: Y-B line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Vb-THD-F/R: B-R line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Ir-THD-F/R: R phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Iy-THD-F/R: Y phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Ib-THD-F/R: B phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
In-THD-F/R: Neutral current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
CCr-THD-F/R: R phase Capacitor current % Total Harmonic Distortion.
CCy-THD-F/R: Y phase Capacitor current % Total Harmonic Distortion.
CCb-THD-F/R: B phase Capacitor current % Total Harmonic Distortion.

- 16 -

PAGE: 07

6.Step KVAR
PRESS
PAGE: 07.1

Stp1 KVAR:0009.0
PAGE: 07.2

Stp2 KVAR:0009.0
PAGE: 07.3

Stp3 KVAR:0009.0
PAGE: 07.4

Stp4 KVAR:0009.0
PAGE: 07.5

Stp5 KVAR:0009.0
PAGE: 07.6

Stp6 KVAR:0009.0

Step KVAR: Submenu:
Stp1 KVAR: Step 1 kVAr value normalized at Capacitor rated voltage.
Stp2 KVAR: Step 2 kVAr value normalized at Capacitor rated voltage.
Stp3 KVAR: Step 3 kVAr value normalized at Capacitor rated voltage.
Stp4 KVAR: Step 4 kVAr value normalized at Capacitor rated voltage.
Stp5 KVAR: Step 5 kVAr value normalized at Capacitor rated voltage.
Stp6 KVAR: Step 6 kVAr value normalized at Capacitor rated voltage.

- 17 -

PAGE: 08

Time: 10:10:00
Real Time Clock: RTC time set in the SPF-25 is displayed here. Its in
HH:MM:SS format.

PAGE: 09

Date: 07:11:06
Real Time Clock: RTC date set in the SPF-25 is displayed here. Its in
dd:mm:yy format.

PAGE: 10

SPF-25 1.0.6

SPF-25 internal firmware version number is displayed here. (Just for user
information)

Total number of Main display pages are 11nos ranging from “00” to
“10”.

- 18 -

Method for Keyboard/Display usage.

Flow chart for entering into different modes:

PRESS
Enable

Default
Display
mode

If Password
Option is
Enable/Disable.

Disable

Enter Pwd: ****
PRESS
Enter the 4
Digit password
By use of
L, R, UP & DN
Keys.

PRESS

NO

IF
PASSWORD
Correct?

*

YES
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

1.Edit Mode

2.Auto Mode

3.Manual Mode

- 19 -

Parameter Editing Submenu Level 1:

*
1.General
2.System
3.Fault
4.Step
5.Communication

Sub-menu
Level 1
for
Parameter
Editing.

Parameter Editing
Sub-Menu
LEVEL 2

1.General and IO: Parameters related with general function and Input/Output
2. System: Electrical system (Mains supply) related parameters.

3. Fault: Setting Faults and fault levels.
4. Step: Capacitor Steps related parameters.
5. Communication: Parameters related with communication and data logging.

- 20 -

Parameter Editing Method:
(For Submenu Level 2 : L2)

Sub-Menu Level 1.
Cursor Blinking
at Parameter Values.

1.Submenu L2: ****

1.Submenu L2: ****
PRESS

key to increment value.

PRESS

Key to decrement value.

PRESS

Key to shift cursor Left.

PRESS

Key to shift cursor Right.
2.Submenu L2: ****

2.Submenu L2: ****
PRESS

key to increment value.

PRESS

Key to decrement value.

PRESS

Key to shift cursor Left.

PRESS

Key to shift cursor Right.

3.Submenu L2: ****

Exit: No Save

Exit: No Save

Without saving

Default
Display.

With saving

Screen for 1second

Saving In EEProm

Exit: With Save

- 21 -

Parameter Editing Submenu Level 2:
Menu
General

Parameter
Pwd
Ch-Pwd
Ld Def
THD
Rst. Energy

Meaning of Parameter
Password Control
Password value
Load all factory default parameters.
Type of THD factor to be displayed
Energy Counters reset to zero option

Default
Enable
1111
No
F-THD
No

Menu
System

Parameter
Meas. Vol.
Ld. Cur. Pr.
Cap. Cur. Pr.
PF Target
PF Target
Auto Sync
Async Tol.
Reset Async

Meaning of Parameter
Default
SPF-25 rated measurement voltage
440
Primary current value of mains CT
0180
0075
Primary current value of capacitor CT
Target PF for deciding Lag or Lead
Lag
1.00
Target PF exact value
Automatic synchronisation requirement Yes
% load variation tolerence for Auto-sync. 30
No
Reset Auto-sync to default value.

Menu
Fault

Parameter
Over Vol.
Over Vol. Lim
Over Vol. Clr
Under Vol.
Under Vol. Lim
Under Vol. Clr
Over Load
Over Ld. Lim
Over Ld. Clr
Under Ld.
Under Ld. Lim
Under Ld. Clr
Ld. Unbalance
Ld. Unb. Lim
Over CC
Over CC. Lim
Over CC. Clr
Over CC. Rst.
Over CC. Rst.
Under CC.
Under CC. Lim
Under CC. CLr
CC THD
CC THD Lim
CC THD Clr
Step Check
Cap. Cur Tol
Under Comp.
RTC Bat

Meaning of Parameter
Default
Over Voltage Fault: action by PDE-30 Off Step
Over Voltage activation limit value
1.10
Over Voltage resumption limit value 1.05
Under Voltage Fault: Action?
Off Step
Under Voltage activation limit value 0.70
Under Voltage resumption limit value 0.75
Over Load Fault: Action?
Indicate
Mains current over load limit value
1.30
Mains cur. over load resume value
1.25
Under Load on Mains: Action?
Indicate
Under load Activation limit value
0.03
Under load Resumption limit value
0.05
Load Un-balance Fault: Action?
Off Step
Load Un-balance limit
025%
Capacitor Over Current Fault: Action? Disable
Cap. Over Current Limit value.
1.30
Cap. Over Current Resume value.
1.25
Auto reset feature on Cap. Over Cur. No
If Over CC. Rst.=Yes. Time for reset. 120 sec
Under Capacitor current fault: Action? Disable
Under Cap. Cur. Limit value.
0.95
Under Cap. Cur. Resume value.
0.97
Capacitor current Over THD: Action? Disable
Cap.Cur. Over THD limit value.
0.10
Cap.Cur. Over THD resume value.
0.08
Every step kVAr healthiness monitor. Disable
Step kVAr healthiness: tolerence.
0.10
Out of Banks Indication.
Disable
RTC Battery fault monitoring.
Enable

- 22 -

Min
Disable
0000
No
R-THD
No
Min
Non
0001
0001
Lead
0.70Lag
No
01
No

Min

Max
Enable
9999
Yes
F-THD
Yes
Max
Edible
9999
9999
Lag
0.85Lead
Yes
50
Yes

Max

Disable, Indicative, Off Step

0.90
0.85

1.20
1.15

Disable, Indicative, Off Step

0.70
0.75

0.95
1.00

Disable, Indicative, Off Step

1.10
1.05

1.30
1.25

Disable, Indicative, Off Step

0.01
0.02

0.20
0.25

Disable, Indicative, Off Step

005%

100%

Disable, Indicative, Off Step

1.05
1.00
No
15

1.50
1.45
Yes
900

Disable, Indicative, Off Step

0.75
0.80

0.98
1.00

Disable, Indicative, Off Step

0.02
0.01
Disable
0.03
Disable
Disable

0.99
0.90
Enable
0.50
Enable
Enable

Menu
Step

Parameter
No. of Steps
Step Vol
Corr. Time
Discharge Time
Step 1 KVAR
Step 2 KVAR
Step 3 KVAR
Step 4 KVAR
Step 5 KVAR
Step 6 KVAR

Meaning of Parameter
Number of Capacitor steps utilised
Voltage at which kVAr is defined
Correction cycle time.
Capacitor discharge time.
Step 1 kVAr value.
Step 2 kVAr value.
Step 3 kVAr value.
Step 4 kVAr value.
Step 5 kVAr value.
Step 6 kVAr value.

Menu
Parameter
Meaning of Parameter
Communication Unit ID
Communication ID of the unit
Baud Rate
Serial communication baud rate.
Time
RTC time to be set
Date
RTC date to be set
Init RTC
Initialise RTC?
Clear NVRAM Clear all contents on NV RAM?

Default
3
440
120 secs
120 secs
006
009
018
018
018
018

Min
1
380
010
010
001
001
001
001
001
001

Default
3001
09600
--No
No

Min
0000
04800
--No
No

Max
6
660
240
240
250
250
250
250
250
250

Max
9999
38400
--Yes
Yes

Note that all the parameters in the Sub-Menu Level 2 should be carefully filled in the
SPF-25. Failing to put the correct parameters can make SPF-25 to malfunction.
Its therefore advised that a trained person should only be allowed to change these
values.

- 23 -

Commissioning Instructions :
before panel is powered up for the first time.
1. Panel Wiring Check
Ensure that all connections in the panel is tightened properly and there are no
loose connections. Also ensure that the wiring is done as per the wiring
diagram.
2. Power Wiring Check
Ensure that the power cables are connected properly from the Panel I/C to the
feeder I/C or the transformer bushings. The connection has to be after the
Load Feed back CT looking from the Transformer side.
Ensure that the Bus Bars and/or Lugs are clean and free of Dust, Corrosion or
Oxidation on the contact sides so that good electrical connection is maintained.
The surface area should be flat so as to get maximum contact area.
If required Clean the Bus Bars and/ or Lugs by rubbing it with Polish Paper to
remove the oxidation layer. Provide contact paste in between the contacts
surfaces.
Not performing this, can result in to a weaker source point for Capacitor
charging during Step on and this can generate undesirable Noise which can
hamper the performance of equipments installed in the capacitor panel.
3. Load Feed Back CT connection.
Ensure that the load feed back CT connections are done properly. Confirm that
correct phase CT is connected with the correct phase input terminals. (Even
though auto sync is capable of taking care of wrong CT polarities or CT
position interchanging, but then on display, the Phase readings may be seen to
be interchanged. (May be R-phase reading would be seen in B-phase and
vice-versa.
CT connections to be done carefully so as to ensure that the wire does not get
open and there is no loose connection.

Loose connection’s or open CT secondary can result in to very high voltages
getting developed in the circuit which can damage the CT and also produce
high levels of noise in the system.

- 24 -

Fault Finding Guidelines :

Fault Type

Probable Reason

Action to Take

Unit Does not
turn ON. No
display on LCD.

•Input auxiliary supply
not coming.
•Input side fuses
blown

•Check the input
supply to restore
•Check fuses in the
unit for OK.

Unit does not
turn On any
capacitors even
if PF is below
Lower PF limit.

•If auto-sync failure
message is there at
Power On.

• Load may be highly
fluctuating so need of
manual
synchronisation only.
• This is OK
condition.

• The load KW is too
low with Under load
fault enable condition.
•Control connections
from SPF-25 to
contactor coils are not
proper

•Check control supply
and connections from
SPF-25 to contactors.

BF indication on
Default display.

• Internal Ni-Cd
3.2Vdc battery used
for RTC and NV RAM
must be drained down.

• Replace this battery
in consultancy with
TAS trained
personnel.

Some Capacitor
banks are
declared as
faulty even if
they are
checked to be
OK.

•Individual step health
monitoring is enabled
and tolerance limits
set are too stringent.
• Capacitor current
THD factor is
continuously
fluctuating.

•Set the tolerance
limits for individual
steps monitoring as
relaxed.
• With continuously
fluctuating THD of
Capacitor current and
higher level of THD
can cause some
errors in individual
step KVAR
measurement. Under
this condition, best is
to keep this feature
disabled.

- 25 -

Fault Finding Guidelines (continued):

Fault Type

Probable Reason

Action to Take

Serial
Communication
is not working.

• Baud rate selection
is not proper.
• Unit ID is not set
properly.
• Serial
communication cable
connections are not
proper.

• Select proper baud
rate.
• Set the unit ID
correctly.
• Check the serial
cable continuity as
per the connections
given earlier in this
manual.

Data logging is
not taking place.

• Possible that RTC
date is not set
properly.

• Change the battery
by help of TAS’s
authorised person.

SPF-25 resets
occasionally on
turning OFF of
any contactor.

• The contactor supply
phase may be the
same as used for SPF25 auxiliary supply.
• RC snubbers/ free
wheeling diodes are
not put with contactor
coils.

• Use the different
phase for control
supply of contactors
and for SPF-25 supply
• Usage of RC
snubbers / free
wheeling diodes is
mandatory.

- 26 -

Corporate Office/Works/Design Centre:
W-61, MIDC, Ambad, Nasik - 422010, Maharashtra (India)
Tel: +91-(253)-2384038 / 2381090
Email: [email protected]
Marketing and After-Sales Service:
A/58, Kamal Pushpa, K.C. Road, Bandra, Mumbai-400050.
Tel: +91-9930513923
Email: [email protected]
Regional Office: Delhi
191-B, Ground Floor, Padam Nagar (Filter Market),
New Delhi - 110007 (India).
Tel: +91-9911615701
Email: [email protected]


Slide 20

Operations Manual
SPF-25/6
AUTOMATIC POWER FACTOR
CONTROLLER

TAS Powertek Pvt. Ltd.
Corporate Office:
W-61, MIDC, Ambad, Nasik - 422010, Maharashtra (India)
Tel: +91-(253)-2384038 / 2381090
Email: [email protected]

NOTE
These instructions do not purport to cover all details or
variations in equipment, nor to provide for every possible
contingency to be met in connection with installation,
operation or maintenance.

Should further information be desired or should particular
problems arise which are not covered sufficiently for the
purchasers purposes, the matter should be referred to our
TAS Powertek Pvt. Ltd., office.
The contents of this instruction Manual shall not become
part of or modify any prior or existing agreement or
relationship. The sales contract contains the entire
obligations of TAS Powertek Pvt. Ltd. The warranty
contained in the contract between the parties is the sole
warranty of TAS Powertek Pvt. Ltd. Any statements
contained herein do not create new warranties or modify the
existing warranty.

The reproduction, transmission or use of this
document or its contents is not permitted
without express written authority. Offenders
will be liable for damages. All rights are
reserved.

Index
Index Page
-----------------Features & Specifications
----------Mechanical Dimensions/ mounting --------Functional Block diagram
-----------------PF correction technique
-----------------Back Side terminals
-----------------------Typical wiring scheme ---------------------Front Facia
---------------------------------Communication connector connections ----Display of various parameters / Status ---Method of Keyboard/Display usage -------Parameter Submenu -----------------------Commissioning Instruction (before Powerup)
Fault finding Guidelines ---------------------

-1-

1
2
3
4
5
6
7
8
9
10
19
22
24
25

Features:
• Totally Micro-processor controlled Digital Signal processing
logic for measurements.
• All measurements with 1.0 class accuracy.
• Automatic Synchronisation capable of giving the correct
results for wrong connections at CT terminals (even wrong
polarity of CTs).
• Measurement and kVAr compensation are frequency / THD
compensated.
• Load V,Iph, In and Cap. current THD measurement.
• Up-to 6 output banks control.
• Capable of doing the kVAr measurements on basis of mean
of the correction cycle time and provide kVAr compensation.
• Standard 144 X 144 cabinet for panel door flush mounting.
• Serial communication through standard TAS protocols.
• Manual testing mode for user checking of the Capacitor steps
switching.
• Protections provided (user settable):
Over/under Voltage
Cap. Over/under current / THD.
Over/Under frequency (internally set limits)
Over / Under load.
Load unbalance.
Capacitor individual step kVAr monitoring.
Out of steps: Under-compensation (only for indication)
NV-RAM battery down.
• Data logging for various parameters for 2months period at an
interval of 1hr.
• Unit comes along with PC (Windows compatible) software
for downloading and viewing the logged data.

Specifications:
•
•
•
•
•
•
•
•
•
•
•
•

Feed-back Voltage:440Volt (+10%/-30%)
Current input : 1Amp for load and capacitor feed-back.
Measurement Accuracy: Class 1.0
Auxiliary Supply: 525Vac to 300Vac.
Correction / Discharge time:
Selectable in seconds from 10sec. to 240sec.
Output commands:
NO contacts each with current rating of 0.5Amp AC. at
240Vac.
RS-232 baud rate selectable from 4.8kBPS to 38.4kBPS.
Operating temperature: 0 to 55oC.
1.0class measurement Operating temperature: 0 to 50oC.
Storage temperature: -10 to +75oC.
Humidity: 0 to 98%.
Supply frequency: 45Hz to 55Hz.

-2-

Mechanical Dimensions:
135

144

135

120
144

6

Recommended size for cutout on panel door is 138 X 138.
All Dimensions given are in mm.

Maximum weight: (with clamps and terminals) = 2.5kg.

-3-

Functional Block Diagram:
3 channel
Current f.b.

3
Channel
Cap.
Current
f.b.

3 channel
Voltage f.b.

SPF-25

V, I, PF and Power
Measurement
Block
For every AC mains
Cycle.

Calculation
Block for
• Energy Parameters
• Harmonic analysis

EEPROM
For Data
Logging

Keyboard,
Display and
Other support
Functions
Block.

RS-232 Serial
Communication.
TAS-01
Protocol stack.

Power Factor
Correction Block
+ event monitoring.

Outputs Commands
For Capacitor
Switching.

Power Supply
Block.

Above block diagram gives the functional blocks that are built into SPF-25 PF
correction relay.
These blocks are made up with the combination of functions from hardware and
corresponding firmware that resides in the Program memory of the micro-processor
used therein.
Even though the basic blocks exists as shown in the diagram, there functionality is
interdependent. The entire combination is carefully designed so as to have
minimum effects of Electrical and Electromagnetic noise level on the functionality of
this SPF-25.
The firmware written takes into various error handling eventualities so that the
functioning of this PF relay is error free and highly reliable.

-4-

PF correction technique:
KVAr Inductive

Target
PF.
Cos Φ
= PF

1.5 X kVAr
Of Smallest
Capacitor bank

KW

No change band.
KVAr Capacitive
Capacitor Addition band.
Capacitor Removal band.
SPF-25 for kVAr compensation works with the kW v/s kVAr diagram as shown here
above.
A band is created across the target PF value. (Target PF is set by user). This band
is of +0.75 of the smallest capacitor bank kVAr. Thus, total band width is always 1.5
times the smallest capacitor bank kVAr used. This is a no change band. If the
mains source parameters are within this band, SPF-25 would not change the
capacitors bank status.
If the mains parameters are out of this “No change band”, then SPF-25 calculates
the correct capacitor bank combination to be added / subtracted and within one
correction cycle brings it within the No change band.
The no change band width is selected as mentioned because it has to prevent unnecessary hunting (switching on/off) of the capacitor banks.

-5-

Back Side terminals:

Voltage
Feed-Back

Auxiliary
Supply

Current
Feed-Back
Output commands.

-6-

Capacitor
Current
Feed-Back

Typical Wiring with SPF-25 PF correction system.
L
O
A
D

L
C
R
+

L
C
R
-

L
C
Y
+

L
C
Y
-

L
C
B
+

L
C
B
-

PH 3
PH 2
PH 1
CCR+
CCRCCY+
CCYCCB+
CCB-

S
P
F
2
5

Auxiliary
Supply

L1
L2

Com
C01
C02
|

C06

Mains Connections:
Phase 1 control:
Neutral control:
Commands:
Load Current CT:
Capacitor Current CT:

-7-

Front Facia of SPF-25:
LCD Display

Step status LED indication
Serial Communication Port

Membrane Keypad

Usage of the UP and DN key makes the LCD display to scroll up
and down. This is used for display of various status as well as for
viewing the On line measured electrical values.
These keys are also used for changing values in Parameters
Editing mode and used for status changing of banks in Manual
mode.
Usage of ENT key is for entering the submenu and / or for setting
up some values.
The L and R keys are used in changing the position of the cursor
from Left to Right and vice-versa.

-8-

RS-232 serial communication 9 pin D connector:

5

4

6

3

7

2

8

1

9
RXD

GND

TXD

RS-232 cable connection Details:

PIN
NO

PC side
Connection

CONNECTION

SPF-25

1

NC

2

RXD

TXD

3

TXD

RXD

GND

GND

4
5
6
7
8
9

NC

-9-

Display of Various Parameters / Status:
PAGE: 00

COSΦ= -0.99 A OK

This is default display screen giving
information on PF, mode and
working status.

COSΦ= -0.99 :This part of the display indicates the Power Factor running value. The
sign –ve indicates that PF is Capacitive and no sign (+ve) indicates that PF is Inductive.
The PF indicated is the overall PF of the three phase system.
A or M :
This part either indicates the letter “A” or letter “M”. The letter A means
that SPF-25 is working in Auto mode.
The letter M means that SPF-25 is presently in Manual mode.
The Auto or Manual modes can be selected by pressing ENT key on this page.
(If Password option is enabled, enter the same by using UP/DN/L/R keys and then
Pressing ENT)
Then by UP or DN key you can stroll between the displays:
“1. Edit Mode”, “2. Auto Mode”, “3.Manual Mode”.
The first one “1.Edit Mode” is for parameter changing. The details of parameter changing
are explained in detail in later part of this manual.
The second and third one as display indicates are for selecting Auto or Manual mode
respectively. The ENT key pressed on selecting the mode desired, puts the SPF-25 into
that mode.
Auto Mode: In this mode SPF-25 works in automatic mode. It switches the capacitor
banks automatically depending on the parameter setting of target PF. This mode is the
default mode and is to be used for unmanned operation of the system controlled by
SPF-25.
Manual Mode: This mode is activated for checking/testing the capacitor banks switching.
Its also used for changing the Masking status of the capacitor banks. More on this is
explained later. (On Page 01 explanation)
OK or ** :
The last part of the display that is blinking every 500mS indicates the
working status of SPF-25. “OK” indicates that unit is working fine without any trip
conditions. If there is other indication, the meaning of the same can be as:
OK
:
No Fault
OC
:
Over Capacitor Current
UC
:
Under Capacitor Current
OL
:
Over Load
UL
:
Under Load
OV
:
Over Voltage
UV
:
Under Voltage
OF
:
Over Frequency
UF
:
Under Frequency
OH
:
Over Capacitor Current THD %.
OB
:
Out of Banks
LU
:
Load Unbalance
BF
:
Battery Failure (RTC)
NV
:
NVRAM Checksum Error
VA
:
Voltage Absent
- 10 -

PAGE: 01

PAGE: 01

______

AUTO

______

MAN

This display indicates the Bank status in Auto mode and in Manual mode it helps
to make the specific bank On or Off or declare masked.
: Means Bank is On.
: Means Bank is Off.
: Means Bank is Off and is declared masked (out of action)
: Means Bank does not exist for compensation.
When the Page 01 is in Auto mode, its only for indication of Bank status.
But in Manual mode, the “ENT” key press activates the manual control
mode. The cursor over the bank number starts blinking. The UP and DN
keys can turn On and Off the respective bank.
The DN key pressed puts the respective bank in Masking mode and another
press of DN key brings it out of Masking mode.

Putting the bank masking status permanently:
If a bank is to be permanently put in masked mode or is to be brought out of
permanent masked mode, it can be done by bringing the blinking cursor on
the position of the respective bank by use of L or R key. Then by pressing
DN key, bring the status of the bank to the required level (Masked or
Unmasked). Then press ENT key so that cursor stops blinking. After that by
pressing UP key go to Page 00. Then Press ENT. (If Password option is
enabled, enter the same by using UP/DN/L/R keys and then Press ENT)
“1.EDIT MODE” would be displayed. Press ENT one more time. “1.General
and IO” would be displayed. Press ENT again. “Pwd : Disable” or “Pwd :
Enable” would be displayed. Press UP key. “Exit: No Save” would be
displayed. Press ENT so that cursor will start blinking. Press UP. “Exit: With
Save” would be displayed with cursor blinking. Press ENT. “Saving in
EEPROM” would be displayed for a short time and then Page 00 would be
displayed.
You will observe that the bank status as requirement is changed
permanently to the status desired.

- 11 -

PAGE: 02

1.Overall Values
PRESS
PAGE: 02.1

Avg Vol: 415.7 V
PAGE: 02.2

Avg Cur: 0123.4A
PAGE: 02.3

Tot KW:

0081.2

PAGE: 02.4

TotKVAR: 0024.6
PAGE: 02.5

Tot KVA: 0101.1
PAGE: 02.6

Avg CC:

0031.3A

PAGE: 02.7

CKVAR:

028.35

PAGE: 02.8

LS PF:

0.82

PAGE: 02.9

LS KVAR: 0043.9
PAGE: 02.10

LS KVA:

0125.7

PAGE: 02.11

Freq:

49.9Hz

The Overall values Display menu has submenus as displayed above. As its
self explanatory it means:
Avg Vol: Average voltage of all the three line to line voltage values.
Avg Cur: Average current of all the three phase line current values.
Tot KW: Overall kW of the three phase system measured at source.
TotKVAR: Overall kVAr of the three phase system measured at source.
Tot KVA: Overall kVA of the three phase system measured at source.
Avg CC: Average of three phase current through capacitor panel.
CKVAR: Capacitive kVAr that is compensated by the system.
LS PF: Load side PF. (PF value if not compensated.
LS KVAR: Load side kVAr.
LS KVA: Load side kVA.
Freq: Supply frequency in Hz.
- 12 -

PAGE: 03

2.Per-Phase RMS

PRESS
PAGE: 03.1

R-Y Vol: 415.7 V
PAGE: 03.2

Y-B Vol: 415.7 V
PAGE: 03.3

B-R Vol: 415.7 V
PAGE: 03.4

Rph Cur: 0110.8A
PAGE: 03.5

Yph Cur: 0110.8A
PAGE: 03.6

Bph Cur: 0110.8A
PAGE: 03.7

Neutral: 0010.2A
PAGE: 03.8

Rph Cap: 0022.5A
PAGE: 03.9

Yph Cap: 0022.5A
PAGE: 03.10

Bph Cap: 0022.5A

Per Phase RMS: Submenu:
R-Y Vol: Measured AC Voltage RMS value across R and Y phase.
Y-B Vol: Measured AC Voltage RMS value across Y and B phase.
B-R Vol: Measured AC Voltage RMS value across B and R phase.
Rph Cur: Line current RMS value in R phase. Mains source.
Yph Cur: Line current RMS value in Y phase. Mains source.
Bph Cur: Line current RMS value in B phase. Mains source.
Neutral: Neutral current RMS value.
Rph Cap: Capacitor current RMS value in R phase.
Yph Cap: Capacitor current RMS value in Y phase.
Bph Cap: Capacitor current RMS value in B phase.

- 13 -

PAGE: 04

3.Power
PRESS
PAGE: 04.1

Rph PF:

PAGE: 04.10

1.00

Rph KVA: 0109.7

PAGE: 04.2

Yph PF:

PAGE: 04.11

1.00

Yph KVA: 0109.7

PAGE: 04.3

Bph PF:

PAGE: 04.12

1.00

Bph KVA: 0109.7

PAGE: 04.4

Rph KW:

PAGE: 04.13

0100.2

RphCKVAR: 010.76

PAGE: 04.5

Yph KW:

PAGE: 04.14

0100.2

YphCKVAR: 010.76

PAGE: 04.6

Bph KW:

PAGE: 04.15

0100.2

BphCKVAR: 010.76

PAGE: 04.7

PAGE: 04.16

RphKVAR: 0020.4

Rph mF

PAGE: 04.8

: 165.06

PAGE: 04.17

YphKVAR: 0020.4

Yph mF

PAGE: 04.9

: 165.06

PAGE: 04.18

BphKVAR: 0020.4

Bph mF

: 165.06

Power: Submenu:
Rph PF: Power Factor of R phase on mains source.
Yph PF: Power Factor of Y phase on mains source.
Bph PF: Power Factor of B phase on mains source.
Rph kW: Active Power in kW in R-phase.
Yph kW: Active Power in kW in Y-phase.
Bph kW: Active Power in kW in B-phase.
RphkVAR: Reactive Power in kVAr in R-phase.
YphkVAR: Reactive Power in kVAr in Y-phase.
BphkVAR: Reactive Power in kVAr in B-phase.
Rph KVA: Apparent Power in kVA in R-phase.
Yph KVA: Apparent Power in kVA in Y-phase.
Bph KVA: Apparent Power in kVA in B-phase.
RphCKVAR: Capacitor injected reactive power in R-phase.
YphCKVAR: Capacitor injected reactive power in Y-phase.
BphCKVAR: Capacitor injected reactive power in B-phase.
Rph mF: Capacitor value in micro-farad in R-phase.
Yph mF: Capacitor value in micro-farad in Y-phase.
Bph mF: Capacitor value in micro-farad in B-phase.
- 14 -

PAGE: 05

4.Energy
PRESS
PAGE: 05.1

KWH:

1234567.8

PAGE: 05.2

IndKVARH:12345.6
PAGE: 05.3

CapKVARH:12345.6
PAGE: 05.4

KVAH:

1234567.8

PAGE: 05.5

CKVARH:1234567.8

Energy: Submenu:
KWH: Overall cumulative active energy in kWh on Mains supply.
IndKVARH: Inductive reactive energy in kVArh on Mains supply.
CapKVARH: Capacitive reactive energy in kVArh on Mains supply.
KVAH: Overall cumulative apparent energy in kVA on Mains supply.
CKVARH: Capacitor compensated reactive energy in kVArh.

- 15 -

PAGE: 06

5.Harmonics
PRESS
PAGE: 06.1

Vr-THD-F: 002.4%
PAGE: 06.2

Vy-THD-F: 002.4%
PAGE: 06.3

Vb-THD-F: 002.4%
PAGE: 06.4

Ir-THD-F: 012.5%
PAGE: 06.5

Iy-THD-F: 012.5%
PAGE: 06.6

Ib-THD-F: 012.5%
PAGE: 06.7

In-THD-F: 005.0%
PAGE: 06.8

CCr-THD-F:028.2%
PAGE: 06.9

CCy-THD-F:028.2%
PAGE: 06.10

CCb-THD-F:028.2%

Harmonics: Submenu:
Vr-THD-F/R: R-Y line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Vy-THD-F/R: Y-B line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Vb-THD-F/R: B-R line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Ir-THD-F/R: R phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Iy-THD-F/R: Y phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Ib-THD-F/R: B phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
In-THD-F/R: Neutral current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
CCr-THD-F/R: R phase Capacitor current % Total Harmonic Distortion.
CCy-THD-F/R: Y phase Capacitor current % Total Harmonic Distortion.
CCb-THD-F/R: B phase Capacitor current % Total Harmonic Distortion.

- 16 -

PAGE: 07

6.Step KVAR
PRESS
PAGE: 07.1

Stp1 KVAR:0009.0
PAGE: 07.2

Stp2 KVAR:0009.0
PAGE: 07.3

Stp3 KVAR:0009.0
PAGE: 07.4

Stp4 KVAR:0009.0
PAGE: 07.5

Stp5 KVAR:0009.0
PAGE: 07.6

Stp6 KVAR:0009.0

Step KVAR: Submenu:
Stp1 KVAR: Step 1 kVAr value normalized at Capacitor rated voltage.
Stp2 KVAR: Step 2 kVAr value normalized at Capacitor rated voltage.
Stp3 KVAR: Step 3 kVAr value normalized at Capacitor rated voltage.
Stp4 KVAR: Step 4 kVAr value normalized at Capacitor rated voltage.
Stp5 KVAR: Step 5 kVAr value normalized at Capacitor rated voltage.
Stp6 KVAR: Step 6 kVAr value normalized at Capacitor rated voltage.

- 17 -

PAGE: 08

Time: 10:10:00
Real Time Clock: RTC time set in the SPF-25 is displayed here. Its in
HH:MM:SS format.

PAGE: 09

Date: 07:11:06
Real Time Clock: RTC date set in the SPF-25 is displayed here. Its in
dd:mm:yy format.

PAGE: 10

SPF-25 1.0.6

SPF-25 internal firmware version number is displayed here. (Just for user
information)

Total number of Main display pages are 11nos ranging from “00” to
“10”.

- 18 -

Method for Keyboard/Display usage.

Flow chart for entering into different modes:

PRESS
Enable

Default
Display
mode

If Password
Option is
Enable/Disable.

Disable

Enter Pwd: ****
PRESS
Enter the 4
Digit password
By use of
L, R, UP & DN
Keys.

PRESS

NO

IF
PASSWORD
Correct?

*

YES
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

1.Edit Mode

2.Auto Mode

3.Manual Mode

- 19 -

Parameter Editing Submenu Level 1:

*
1.General
2.System
3.Fault
4.Step
5.Communication

Sub-menu
Level 1
for
Parameter
Editing.

Parameter Editing
Sub-Menu
LEVEL 2

1.General and IO: Parameters related with general function and Input/Output
2. System: Electrical system (Mains supply) related parameters.

3. Fault: Setting Faults and fault levels.
4. Step: Capacitor Steps related parameters.
5. Communication: Parameters related with communication and data logging.

- 20 -

Parameter Editing Method:
(For Submenu Level 2 : L2)

Sub-Menu Level 1.
Cursor Blinking
at Parameter Values.

1.Submenu L2: ****

1.Submenu L2: ****
PRESS

key to increment value.

PRESS

Key to decrement value.

PRESS

Key to shift cursor Left.

PRESS

Key to shift cursor Right.
2.Submenu L2: ****

2.Submenu L2: ****
PRESS

key to increment value.

PRESS

Key to decrement value.

PRESS

Key to shift cursor Left.

PRESS

Key to shift cursor Right.

3.Submenu L2: ****

Exit: No Save

Exit: No Save

Without saving

Default
Display.

With saving

Screen for 1second

Saving In EEProm

Exit: With Save

- 21 -

Parameter Editing Submenu Level 2:
Menu
General

Parameter
Pwd
Ch-Pwd
Ld Def
THD
Rst. Energy

Meaning of Parameter
Password Control
Password value
Load all factory default parameters.
Type of THD factor to be displayed
Energy Counters reset to zero option

Default
Enable
1111
No
F-THD
No

Menu
System

Parameter
Meas. Vol.
Ld. Cur. Pr.
Cap. Cur. Pr.
PF Target
PF Target
Auto Sync
Async Tol.
Reset Async

Meaning of Parameter
Default
SPF-25 rated measurement voltage
440
Primary current value of mains CT
0180
0075
Primary current value of capacitor CT
Target PF for deciding Lag or Lead
Lag
1.00
Target PF exact value
Automatic synchronisation requirement Yes
% load variation tolerence for Auto-sync. 30
No
Reset Auto-sync to default value.

Menu
Fault

Parameter
Over Vol.
Over Vol. Lim
Over Vol. Clr
Under Vol.
Under Vol. Lim
Under Vol. Clr
Over Load
Over Ld. Lim
Over Ld. Clr
Under Ld.
Under Ld. Lim
Under Ld. Clr
Ld. Unbalance
Ld. Unb. Lim
Over CC
Over CC. Lim
Over CC. Clr
Over CC. Rst.
Over CC. Rst.
Under CC.
Under CC. Lim
Under CC. CLr
CC THD
CC THD Lim
CC THD Clr
Step Check
Cap. Cur Tol
Under Comp.
RTC Bat

Meaning of Parameter
Default
Over Voltage Fault: action by PDE-30 Off Step
Over Voltage activation limit value
1.10
Over Voltage resumption limit value 1.05
Under Voltage Fault: Action?
Off Step
Under Voltage activation limit value 0.70
Under Voltage resumption limit value 0.75
Over Load Fault: Action?
Indicate
Mains current over load limit value
1.30
Mains cur. over load resume value
1.25
Under Load on Mains: Action?
Indicate
Under load Activation limit value
0.03
Under load Resumption limit value
0.05
Load Un-balance Fault: Action?
Off Step
Load Un-balance limit
025%
Capacitor Over Current Fault: Action? Disable
Cap. Over Current Limit value.
1.30
Cap. Over Current Resume value.
1.25
Auto reset feature on Cap. Over Cur. No
If Over CC. Rst.=Yes. Time for reset. 120 sec
Under Capacitor current fault: Action? Disable
Under Cap. Cur. Limit value.
0.95
Under Cap. Cur. Resume value.
0.97
Capacitor current Over THD: Action? Disable
Cap.Cur. Over THD limit value.
0.10
Cap.Cur. Over THD resume value.
0.08
Every step kVAr healthiness monitor. Disable
Step kVAr healthiness: tolerence.
0.10
Out of Banks Indication.
Disable
RTC Battery fault monitoring.
Enable

- 22 -

Min
Disable
0000
No
R-THD
No
Min
Non
0001
0001
Lead
0.70Lag
No
01
No

Min

Max
Enable
9999
Yes
F-THD
Yes
Max
Edible
9999
9999
Lag
0.85Lead
Yes
50
Yes

Max

Disable, Indicative, Off Step

0.90
0.85

1.20
1.15

Disable, Indicative, Off Step

0.70
0.75

0.95
1.00

Disable, Indicative, Off Step

1.10
1.05

1.30
1.25

Disable, Indicative, Off Step

0.01
0.02

0.20
0.25

Disable, Indicative, Off Step

005%

100%

Disable, Indicative, Off Step

1.05
1.00
No
15

1.50
1.45
Yes
900

Disable, Indicative, Off Step

0.75
0.80

0.98
1.00

Disable, Indicative, Off Step

0.02
0.01
Disable
0.03
Disable
Disable

0.99
0.90
Enable
0.50
Enable
Enable

Menu
Step

Parameter
No. of Steps
Step Vol
Corr. Time
Discharge Time
Step 1 KVAR
Step 2 KVAR
Step 3 KVAR
Step 4 KVAR
Step 5 KVAR
Step 6 KVAR

Meaning of Parameter
Number of Capacitor steps utilised
Voltage at which kVAr is defined
Correction cycle time.
Capacitor discharge time.
Step 1 kVAr value.
Step 2 kVAr value.
Step 3 kVAr value.
Step 4 kVAr value.
Step 5 kVAr value.
Step 6 kVAr value.

Menu
Parameter
Meaning of Parameter
Communication Unit ID
Communication ID of the unit
Baud Rate
Serial communication baud rate.
Time
RTC time to be set
Date
RTC date to be set
Init RTC
Initialise RTC?
Clear NVRAM Clear all contents on NV RAM?

Default
3
440
120 secs
120 secs
006
009
018
018
018
018

Min
1
380
010
010
001
001
001
001
001
001

Default
3001
09600
--No
No

Min
0000
04800
--No
No

Max
6
660
240
240
250
250
250
250
250
250

Max
9999
38400
--Yes
Yes

Note that all the parameters in the Sub-Menu Level 2 should be carefully filled in the
SPF-25. Failing to put the correct parameters can make SPF-25 to malfunction.
Its therefore advised that a trained person should only be allowed to change these
values.

- 23 -

Commissioning Instructions :
before panel is powered up for the first time.
1. Panel Wiring Check
Ensure that all connections in the panel is tightened properly and there are no
loose connections. Also ensure that the wiring is done as per the wiring
diagram.
2. Power Wiring Check
Ensure that the power cables are connected properly from the Panel I/C to the
feeder I/C or the transformer bushings. The connection has to be after the
Load Feed back CT looking from the Transformer side.
Ensure that the Bus Bars and/or Lugs are clean and free of Dust, Corrosion or
Oxidation on the contact sides so that good electrical connection is maintained.
The surface area should be flat so as to get maximum contact area.
If required Clean the Bus Bars and/ or Lugs by rubbing it with Polish Paper to
remove the oxidation layer. Provide contact paste in between the contacts
surfaces.
Not performing this, can result in to a weaker source point for Capacitor
charging during Step on and this can generate undesirable Noise which can
hamper the performance of equipments installed in the capacitor panel.
3. Load Feed Back CT connection.
Ensure that the load feed back CT connections are done properly. Confirm that
correct phase CT is connected with the correct phase input terminals. (Even
though auto sync is capable of taking care of wrong CT polarities or CT
position interchanging, but then on display, the Phase readings may be seen to
be interchanged. (May be R-phase reading would be seen in B-phase and
vice-versa.
CT connections to be done carefully so as to ensure that the wire does not get
open and there is no loose connection.

Loose connection’s or open CT secondary can result in to very high voltages
getting developed in the circuit which can damage the CT and also produce
high levels of noise in the system.

- 24 -

Fault Finding Guidelines :

Fault Type

Probable Reason

Action to Take

Unit Does not
turn ON. No
display on LCD.

•Input auxiliary supply
not coming.
•Input side fuses
blown

•Check the input
supply to restore
•Check fuses in the
unit for OK.

Unit does not
turn On any
capacitors even
if PF is below
Lower PF limit.

•If auto-sync failure
message is there at
Power On.

• Load may be highly
fluctuating so need of
manual
synchronisation only.
• This is OK
condition.

• The load KW is too
low with Under load
fault enable condition.
•Control connections
from SPF-25 to
contactor coils are not
proper

•Check control supply
and connections from
SPF-25 to contactors.

BF indication on
Default display.

• Internal Ni-Cd
3.2Vdc battery used
for RTC and NV RAM
must be drained down.

• Replace this battery
in consultancy with
TAS trained
personnel.

Some Capacitor
banks are
declared as
faulty even if
they are
checked to be
OK.

•Individual step health
monitoring is enabled
and tolerance limits
set are too stringent.
• Capacitor current
THD factor is
continuously
fluctuating.

•Set the tolerance
limits for individual
steps monitoring as
relaxed.
• With continuously
fluctuating THD of
Capacitor current and
higher level of THD
can cause some
errors in individual
step KVAR
measurement. Under
this condition, best is
to keep this feature
disabled.

- 25 -

Fault Finding Guidelines (continued):

Fault Type

Probable Reason

Action to Take

Serial
Communication
is not working.

• Baud rate selection
is not proper.
• Unit ID is not set
properly.
• Serial
communication cable
connections are not
proper.

• Select proper baud
rate.
• Set the unit ID
correctly.
• Check the serial
cable continuity as
per the connections
given earlier in this
manual.

Data logging is
not taking place.

• Possible that RTC
date is not set
properly.

• Change the battery
by help of TAS’s
authorised person.

SPF-25 resets
occasionally on
turning OFF of
any contactor.

• The contactor supply
phase may be the
same as used for SPF25 auxiliary supply.
• RC snubbers/ free
wheeling diodes are
not put with contactor
coils.

• Use the different
phase for control
supply of contactors
and for SPF-25 supply
• Usage of RC
snubbers / free
wheeling diodes is
mandatory.

- 26 -

Corporate Office/Works/Design Centre:
W-61, MIDC, Ambad, Nasik - 422010, Maharashtra (India)
Tel: +91-(253)-2384038 / 2381090
Email: [email protected]
Marketing and After-Sales Service:
A/58, Kamal Pushpa, K.C. Road, Bandra, Mumbai-400050.
Tel: +91-9930513923
Email: [email protected]
Regional Office: Delhi
191-B, Ground Floor, Padam Nagar (Filter Market),
New Delhi - 110007 (India).
Tel: +91-9911615701
Email: [email protected]


Slide 21

Operations Manual
SPF-25/6
AUTOMATIC POWER FACTOR
CONTROLLER

TAS Powertek Pvt. Ltd.
Corporate Office:
W-61, MIDC, Ambad, Nasik - 422010, Maharashtra (India)
Tel: +91-(253)-2384038 / 2381090
Email: [email protected]

NOTE
These instructions do not purport to cover all details or
variations in equipment, nor to provide for every possible
contingency to be met in connection with installation,
operation or maintenance.

Should further information be desired or should particular
problems arise which are not covered sufficiently for the
purchasers purposes, the matter should be referred to our
TAS Powertek Pvt. Ltd., office.
The contents of this instruction Manual shall not become
part of or modify any prior or existing agreement or
relationship. The sales contract contains the entire
obligations of TAS Powertek Pvt. Ltd. The warranty
contained in the contract between the parties is the sole
warranty of TAS Powertek Pvt. Ltd. Any statements
contained herein do not create new warranties or modify the
existing warranty.

The reproduction, transmission or use of this
document or its contents is not permitted
without express written authority. Offenders
will be liable for damages. All rights are
reserved.

Index
Index Page
-----------------Features & Specifications
----------Mechanical Dimensions/ mounting --------Functional Block diagram
-----------------PF correction technique
-----------------Back Side terminals
-----------------------Typical wiring scheme ---------------------Front Facia
---------------------------------Communication connector connections ----Display of various parameters / Status ---Method of Keyboard/Display usage -------Parameter Submenu -----------------------Commissioning Instruction (before Powerup)
Fault finding Guidelines ---------------------

-1-

1
2
3
4
5
6
7
8
9
10
19
22
24
25

Features:
• Totally Micro-processor controlled Digital Signal processing
logic for measurements.
• All measurements with 1.0 class accuracy.
• Automatic Synchronisation capable of giving the correct
results for wrong connections at CT terminals (even wrong
polarity of CTs).
• Measurement and kVAr compensation are frequency / THD
compensated.
• Load V,Iph, In and Cap. current THD measurement.
• Up-to 6 output banks control.
• Capable of doing the kVAr measurements on basis of mean
of the correction cycle time and provide kVAr compensation.
• Standard 144 X 144 cabinet for panel door flush mounting.
• Serial communication through standard TAS protocols.
• Manual testing mode for user checking of the Capacitor steps
switching.
• Protections provided (user settable):
Over/under Voltage
Cap. Over/under current / THD.
Over/Under frequency (internally set limits)
Over / Under load.
Load unbalance.
Capacitor individual step kVAr monitoring.
Out of steps: Under-compensation (only for indication)
NV-RAM battery down.
• Data logging for various parameters for 2months period at an
interval of 1hr.
• Unit comes along with PC (Windows compatible) software
for downloading and viewing the logged data.

Specifications:
•
•
•
•
•
•
•
•
•
•
•
•

Feed-back Voltage:440Volt (+10%/-30%)
Current input : 1Amp for load and capacitor feed-back.
Measurement Accuracy: Class 1.0
Auxiliary Supply: 525Vac to 300Vac.
Correction / Discharge time:
Selectable in seconds from 10sec. to 240sec.
Output commands:
NO contacts each with current rating of 0.5Amp AC. at
240Vac.
RS-232 baud rate selectable from 4.8kBPS to 38.4kBPS.
Operating temperature: 0 to 55oC.
1.0class measurement Operating temperature: 0 to 50oC.
Storage temperature: -10 to +75oC.
Humidity: 0 to 98%.
Supply frequency: 45Hz to 55Hz.

-2-

Mechanical Dimensions:
135

144

135

120
144

6

Recommended size for cutout on panel door is 138 X 138.
All Dimensions given are in mm.

Maximum weight: (with clamps and terminals) = 2.5kg.

-3-

Functional Block Diagram:
3 channel
Current f.b.

3
Channel
Cap.
Current
f.b.

3 channel
Voltage f.b.

SPF-25

V, I, PF and Power
Measurement
Block
For every AC mains
Cycle.

Calculation
Block for
• Energy Parameters
• Harmonic analysis

EEPROM
For Data
Logging

Keyboard,
Display and
Other support
Functions
Block.

RS-232 Serial
Communication.
TAS-01
Protocol stack.

Power Factor
Correction Block
+ event monitoring.

Outputs Commands
For Capacitor
Switching.

Power Supply
Block.

Above block diagram gives the functional blocks that are built into SPF-25 PF
correction relay.
These blocks are made up with the combination of functions from hardware and
corresponding firmware that resides in the Program memory of the micro-processor
used therein.
Even though the basic blocks exists as shown in the diagram, there functionality is
interdependent. The entire combination is carefully designed so as to have
minimum effects of Electrical and Electromagnetic noise level on the functionality of
this SPF-25.
The firmware written takes into various error handling eventualities so that the
functioning of this PF relay is error free and highly reliable.

-4-

PF correction technique:
KVAr Inductive

Target
PF.
Cos Φ
= PF

1.5 X kVAr
Of Smallest
Capacitor bank

KW

No change band.
KVAr Capacitive
Capacitor Addition band.
Capacitor Removal band.
SPF-25 for kVAr compensation works with the kW v/s kVAr diagram as shown here
above.
A band is created across the target PF value. (Target PF is set by user). This band
is of +0.75 of the smallest capacitor bank kVAr. Thus, total band width is always 1.5
times the smallest capacitor bank kVAr used. This is a no change band. If the
mains source parameters are within this band, SPF-25 would not change the
capacitors bank status.
If the mains parameters are out of this “No change band”, then SPF-25 calculates
the correct capacitor bank combination to be added / subtracted and within one
correction cycle brings it within the No change band.
The no change band width is selected as mentioned because it has to prevent unnecessary hunting (switching on/off) of the capacitor banks.

-5-

Back Side terminals:

Voltage
Feed-Back

Auxiliary
Supply

Current
Feed-Back
Output commands.

-6-

Capacitor
Current
Feed-Back

Typical Wiring with SPF-25 PF correction system.
L
O
A
D

L
C
R
+

L
C
R
-

L
C
Y
+

L
C
Y
-

L
C
B
+

L
C
B
-

PH 3
PH 2
PH 1
CCR+
CCRCCY+
CCYCCB+
CCB-

S
P
F
2
5

Auxiliary
Supply

L1
L2

Com
C01
C02
|

C06

Mains Connections:
Phase 1 control:
Neutral control:
Commands:
Load Current CT:
Capacitor Current CT:

-7-

Front Facia of SPF-25:
LCD Display

Step status LED indication
Serial Communication Port

Membrane Keypad

Usage of the UP and DN key makes the LCD display to scroll up
and down. This is used for display of various status as well as for
viewing the On line measured electrical values.
These keys are also used for changing values in Parameters
Editing mode and used for status changing of banks in Manual
mode.
Usage of ENT key is for entering the submenu and / or for setting
up some values.
The L and R keys are used in changing the position of the cursor
from Left to Right and vice-versa.

-8-

RS-232 serial communication 9 pin D connector:

5

4

6

3

7

2

8

1

9
RXD

GND

TXD

RS-232 cable connection Details:

PIN
NO

PC side
Connection

CONNECTION

SPF-25

1

NC

2

RXD

TXD

3

TXD

RXD

GND

GND

4
5
6
7
8
9

NC

-9-

Display of Various Parameters / Status:
PAGE: 00

COSΦ= -0.99 A OK

This is default display screen giving
information on PF, mode and
working status.

COSΦ= -0.99 :This part of the display indicates the Power Factor running value. The
sign –ve indicates that PF is Capacitive and no sign (+ve) indicates that PF is Inductive.
The PF indicated is the overall PF of the three phase system.
A or M :
This part either indicates the letter “A” or letter “M”. The letter A means
that SPF-25 is working in Auto mode.
The letter M means that SPF-25 is presently in Manual mode.
The Auto or Manual modes can be selected by pressing ENT key on this page.
(If Password option is enabled, enter the same by using UP/DN/L/R keys and then
Pressing ENT)
Then by UP or DN key you can stroll between the displays:
“1. Edit Mode”, “2. Auto Mode”, “3.Manual Mode”.
The first one “1.Edit Mode” is for parameter changing. The details of parameter changing
are explained in detail in later part of this manual.
The second and third one as display indicates are for selecting Auto or Manual mode
respectively. The ENT key pressed on selecting the mode desired, puts the SPF-25 into
that mode.
Auto Mode: In this mode SPF-25 works in automatic mode. It switches the capacitor
banks automatically depending on the parameter setting of target PF. This mode is the
default mode and is to be used for unmanned operation of the system controlled by
SPF-25.
Manual Mode: This mode is activated for checking/testing the capacitor banks switching.
Its also used for changing the Masking status of the capacitor banks. More on this is
explained later. (On Page 01 explanation)
OK or ** :
The last part of the display that is blinking every 500mS indicates the
working status of SPF-25. “OK” indicates that unit is working fine without any trip
conditions. If there is other indication, the meaning of the same can be as:
OK
:
No Fault
OC
:
Over Capacitor Current
UC
:
Under Capacitor Current
OL
:
Over Load
UL
:
Under Load
OV
:
Over Voltage
UV
:
Under Voltage
OF
:
Over Frequency
UF
:
Under Frequency
OH
:
Over Capacitor Current THD %.
OB
:
Out of Banks
LU
:
Load Unbalance
BF
:
Battery Failure (RTC)
NV
:
NVRAM Checksum Error
VA
:
Voltage Absent
- 10 -

PAGE: 01

PAGE: 01

______

AUTO

______

MAN

This display indicates the Bank status in Auto mode and in Manual mode it helps
to make the specific bank On or Off or declare masked.
: Means Bank is On.
: Means Bank is Off.
: Means Bank is Off and is declared masked (out of action)
: Means Bank does not exist for compensation.
When the Page 01 is in Auto mode, its only for indication of Bank status.
But in Manual mode, the “ENT” key press activates the manual control
mode. The cursor over the bank number starts blinking. The UP and DN
keys can turn On and Off the respective bank.
The DN key pressed puts the respective bank in Masking mode and another
press of DN key brings it out of Masking mode.

Putting the bank masking status permanently:
If a bank is to be permanently put in masked mode or is to be brought out of
permanent masked mode, it can be done by bringing the blinking cursor on
the position of the respective bank by use of L or R key. Then by pressing
DN key, bring the status of the bank to the required level (Masked or
Unmasked). Then press ENT key so that cursor stops blinking. After that by
pressing UP key go to Page 00. Then Press ENT. (If Password option is
enabled, enter the same by using UP/DN/L/R keys and then Press ENT)
“1.EDIT MODE” would be displayed. Press ENT one more time. “1.General
and IO” would be displayed. Press ENT again. “Pwd : Disable” or “Pwd :
Enable” would be displayed. Press UP key. “Exit: No Save” would be
displayed. Press ENT so that cursor will start blinking. Press UP. “Exit: With
Save” would be displayed with cursor blinking. Press ENT. “Saving in
EEPROM” would be displayed for a short time and then Page 00 would be
displayed.
You will observe that the bank status as requirement is changed
permanently to the status desired.

- 11 -

PAGE: 02

1.Overall Values
PRESS
PAGE: 02.1

Avg Vol: 415.7 V
PAGE: 02.2

Avg Cur: 0123.4A
PAGE: 02.3

Tot KW:

0081.2

PAGE: 02.4

TotKVAR: 0024.6
PAGE: 02.5

Tot KVA: 0101.1
PAGE: 02.6

Avg CC:

0031.3A

PAGE: 02.7

CKVAR:

028.35

PAGE: 02.8

LS PF:

0.82

PAGE: 02.9

LS KVAR: 0043.9
PAGE: 02.10

LS KVA:

0125.7

PAGE: 02.11

Freq:

49.9Hz

The Overall values Display menu has submenus as displayed above. As its
self explanatory it means:
Avg Vol: Average voltage of all the three line to line voltage values.
Avg Cur: Average current of all the three phase line current values.
Tot KW: Overall kW of the three phase system measured at source.
TotKVAR: Overall kVAr of the three phase system measured at source.
Tot KVA: Overall kVA of the three phase system measured at source.
Avg CC: Average of three phase current through capacitor panel.
CKVAR: Capacitive kVAr that is compensated by the system.
LS PF: Load side PF. (PF value if not compensated.
LS KVAR: Load side kVAr.
LS KVA: Load side kVA.
Freq: Supply frequency in Hz.
- 12 -

PAGE: 03

2.Per-Phase RMS

PRESS
PAGE: 03.1

R-Y Vol: 415.7 V
PAGE: 03.2

Y-B Vol: 415.7 V
PAGE: 03.3

B-R Vol: 415.7 V
PAGE: 03.4

Rph Cur: 0110.8A
PAGE: 03.5

Yph Cur: 0110.8A
PAGE: 03.6

Bph Cur: 0110.8A
PAGE: 03.7

Neutral: 0010.2A
PAGE: 03.8

Rph Cap: 0022.5A
PAGE: 03.9

Yph Cap: 0022.5A
PAGE: 03.10

Bph Cap: 0022.5A

Per Phase RMS: Submenu:
R-Y Vol: Measured AC Voltage RMS value across R and Y phase.
Y-B Vol: Measured AC Voltage RMS value across Y and B phase.
B-R Vol: Measured AC Voltage RMS value across B and R phase.
Rph Cur: Line current RMS value in R phase. Mains source.
Yph Cur: Line current RMS value in Y phase. Mains source.
Bph Cur: Line current RMS value in B phase. Mains source.
Neutral: Neutral current RMS value.
Rph Cap: Capacitor current RMS value in R phase.
Yph Cap: Capacitor current RMS value in Y phase.
Bph Cap: Capacitor current RMS value in B phase.

- 13 -

PAGE: 04

3.Power
PRESS
PAGE: 04.1

Rph PF:

PAGE: 04.10

1.00

Rph KVA: 0109.7

PAGE: 04.2

Yph PF:

PAGE: 04.11

1.00

Yph KVA: 0109.7

PAGE: 04.3

Bph PF:

PAGE: 04.12

1.00

Bph KVA: 0109.7

PAGE: 04.4

Rph KW:

PAGE: 04.13

0100.2

RphCKVAR: 010.76

PAGE: 04.5

Yph KW:

PAGE: 04.14

0100.2

YphCKVAR: 010.76

PAGE: 04.6

Bph KW:

PAGE: 04.15

0100.2

BphCKVAR: 010.76

PAGE: 04.7

PAGE: 04.16

RphKVAR: 0020.4

Rph mF

PAGE: 04.8

: 165.06

PAGE: 04.17

YphKVAR: 0020.4

Yph mF

PAGE: 04.9

: 165.06

PAGE: 04.18

BphKVAR: 0020.4

Bph mF

: 165.06

Power: Submenu:
Rph PF: Power Factor of R phase on mains source.
Yph PF: Power Factor of Y phase on mains source.
Bph PF: Power Factor of B phase on mains source.
Rph kW: Active Power in kW in R-phase.
Yph kW: Active Power in kW in Y-phase.
Bph kW: Active Power in kW in B-phase.
RphkVAR: Reactive Power in kVAr in R-phase.
YphkVAR: Reactive Power in kVAr in Y-phase.
BphkVAR: Reactive Power in kVAr in B-phase.
Rph KVA: Apparent Power in kVA in R-phase.
Yph KVA: Apparent Power in kVA in Y-phase.
Bph KVA: Apparent Power in kVA in B-phase.
RphCKVAR: Capacitor injected reactive power in R-phase.
YphCKVAR: Capacitor injected reactive power in Y-phase.
BphCKVAR: Capacitor injected reactive power in B-phase.
Rph mF: Capacitor value in micro-farad in R-phase.
Yph mF: Capacitor value in micro-farad in Y-phase.
Bph mF: Capacitor value in micro-farad in B-phase.
- 14 -

PAGE: 05

4.Energy
PRESS
PAGE: 05.1

KWH:

1234567.8

PAGE: 05.2

IndKVARH:12345.6
PAGE: 05.3

CapKVARH:12345.6
PAGE: 05.4

KVAH:

1234567.8

PAGE: 05.5

CKVARH:1234567.8

Energy: Submenu:
KWH: Overall cumulative active energy in kWh on Mains supply.
IndKVARH: Inductive reactive energy in kVArh on Mains supply.
CapKVARH: Capacitive reactive energy in kVArh on Mains supply.
KVAH: Overall cumulative apparent energy in kVA on Mains supply.
CKVARH: Capacitor compensated reactive energy in kVArh.

- 15 -

PAGE: 06

5.Harmonics
PRESS
PAGE: 06.1

Vr-THD-F: 002.4%
PAGE: 06.2

Vy-THD-F: 002.4%
PAGE: 06.3

Vb-THD-F: 002.4%
PAGE: 06.4

Ir-THD-F: 012.5%
PAGE: 06.5

Iy-THD-F: 012.5%
PAGE: 06.6

Ib-THD-F: 012.5%
PAGE: 06.7

In-THD-F: 005.0%
PAGE: 06.8

CCr-THD-F:028.2%
PAGE: 06.9

CCy-THD-F:028.2%
PAGE: 06.10

CCb-THD-F:028.2%

Harmonics: Submenu:
Vr-THD-F/R: R-Y line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Vy-THD-F/R: Y-B line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Vb-THD-F/R: B-R line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Ir-THD-F/R: R phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Iy-THD-F/R: Y phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Ib-THD-F/R: B phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
In-THD-F/R: Neutral current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
CCr-THD-F/R: R phase Capacitor current % Total Harmonic Distortion.
CCy-THD-F/R: Y phase Capacitor current % Total Harmonic Distortion.
CCb-THD-F/R: B phase Capacitor current % Total Harmonic Distortion.

- 16 -

PAGE: 07

6.Step KVAR
PRESS
PAGE: 07.1

Stp1 KVAR:0009.0
PAGE: 07.2

Stp2 KVAR:0009.0
PAGE: 07.3

Stp3 KVAR:0009.0
PAGE: 07.4

Stp4 KVAR:0009.0
PAGE: 07.5

Stp5 KVAR:0009.0
PAGE: 07.6

Stp6 KVAR:0009.0

Step KVAR: Submenu:
Stp1 KVAR: Step 1 kVAr value normalized at Capacitor rated voltage.
Stp2 KVAR: Step 2 kVAr value normalized at Capacitor rated voltage.
Stp3 KVAR: Step 3 kVAr value normalized at Capacitor rated voltage.
Stp4 KVAR: Step 4 kVAr value normalized at Capacitor rated voltage.
Stp5 KVAR: Step 5 kVAr value normalized at Capacitor rated voltage.
Stp6 KVAR: Step 6 kVAr value normalized at Capacitor rated voltage.

- 17 -

PAGE: 08

Time: 10:10:00
Real Time Clock: RTC time set in the SPF-25 is displayed here. Its in
HH:MM:SS format.

PAGE: 09

Date: 07:11:06
Real Time Clock: RTC date set in the SPF-25 is displayed here. Its in
dd:mm:yy format.

PAGE: 10

SPF-25 1.0.6

SPF-25 internal firmware version number is displayed here. (Just for user
information)

Total number of Main display pages are 11nos ranging from “00” to
“10”.

- 18 -

Method for Keyboard/Display usage.

Flow chart for entering into different modes:

PRESS
Enable

Default
Display
mode

If Password
Option is
Enable/Disable.

Disable

Enter Pwd: ****
PRESS
Enter the 4
Digit password
By use of
L, R, UP & DN
Keys.

PRESS

NO

IF
PASSWORD
Correct?

*

YES
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

1.Edit Mode

2.Auto Mode

3.Manual Mode

- 19 -

Parameter Editing Submenu Level 1:

*
1.General
2.System
3.Fault
4.Step
5.Communication

Sub-menu
Level 1
for
Parameter
Editing.

Parameter Editing
Sub-Menu
LEVEL 2

1.General and IO: Parameters related with general function and Input/Output
2. System: Electrical system (Mains supply) related parameters.

3. Fault: Setting Faults and fault levels.
4. Step: Capacitor Steps related parameters.
5. Communication: Parameters related with communication and data logging.

- 20 -

Parameter Editing Method:
(For Submenu Level 2 : L2)

Sub-Menu Level 1.
Cursor Blinking
at Parameter Values.

1.Submenu L2: ****

1.Submenu L2: ****
PRESS

key to increment value.

PRESS

Key to decrement value.

PRESS

Key to shift cursor Left.

PRESS

Key to shift cursor Right.
2.Submenu L2: ****

2.Submenu L2: ****
PRESS

key to increment value.

PRESS

Key to decrement value.

PRESS

Key to shift cursor Left.

PRESS

Key to shift cursor Right.

3.Submenu L2: ****

Exit: No Save

Exit: No Save

Without saving

Default
Display.

With saving

Screen for 1second

Saving In EEProm

Exit: With Save

- 21 -

Parameter Editing Submenu Level 2:
Menu
General

Parameter
Pwd
Ch-Pwd
Ld Def
THD
Rst. Energy

Meaning of Parameter
Password Control
Password value
Load all factory default parameters.
Type of THD factor to be displayed
Energy Counters reset to zero option

Default
Enable
1111
No
F-THD
No

Menu
System

Parameter
Meas. Vol.
Ld. Cur. Pr.
Cap. Cur. Pr.
PF Target
PF Target
Auto Sync
Async Tol.
Reset Async

Meaning of Parameter
Default
SPF-25 rated measurement voltage
440
Primary current value of mains CT
0180
0075
Primary current value of capacitor CT
Target PF for deciding Lag or Lead
Lag
1.00
Target PF exact value
Automatic synchronisation requirement Yes
% load variation tolerence for Auto-sync. 30
No
Reset Auto-sync to default value.

Menu
Fault

Parameter
Over Vol.
Over Vol. Lim
Over Vol. Clr
Under Vol.
Under Vol. Lim
Under Vol. Clr
Over Load
Over Ld. Lim
Over Ld. Clr
Under Ld.
Under Ld. Lim
Under Ld. Clr
Ld. Unbalance
Ld. Unb. Lim
Over CC
Over CC. Lim
Over CC. Clr
Over CC. Rst.
Over CC. Rst.
Under CC.
Under CC. Lim
Under CC. CLr
CC THD
CC THD Lim
CC THD Clr
Step Check
Cap. Cur Tol
Under Comp.
RTC Bat

Meaning of Parameter
Default
Over Voltage Fault: action by PDE-30 Off Step
Over Voltage activation limit value
1.10
Over Voltage resumption limit value 1.05
Under Voltage Fault: Action?
Off Step
Under Voltage activation limit value 0.70
Under Voltage resumption limit value 0.75
Over Load Fault: Action?
Indicate
Mains current over load limit value
1.30
Mains cur. over load resume value
1.25
Under Load on Mains: Action?
Indicate
Under load Activation limit value
0.03
Under load Resumption limit value
0.05
Load Un-balance Fault: Action?
Off Step
Load Un-balance limit
025%
Capacitor Over Current Fault: Action? Disable
Cap. Over Current Limit value.
1.30
Cap. Over Current Resume value.
1.25
Auto reset feature on Cap. Over Cur. No
If Over CC. Rst.=Yes. Time for reset. 120 sec
Under Capacitor current fault: Action? Disable
Under Cap. Cur. Limit value.
0.95
Under Cap. Cur. Resume value.
0.97
Capacitor current Over THD: Action? Disable
Cap.Cur. Over THD limit value.
0.10
Cap.Cur. Over THD resume value.
0.08
Every step kVAr healthiness monitor. Disable
Step kVAr healthiness: tolerence.
0.10
Out of Banks Indication.
Disable
RTC Battery fault monitoring.
Enable

- 22 -

Min
Disable
0000
No
R-THD
No
Min
Non
0001
0001
Lead
0.70Lag
No
01
No

Min

Max
Enable
9999
Yes
F-THD
Yes
Max
Edible
9999
9999
Lag
0.85Lead
Yes
50
Yes

Max

Disable, Indicative, Off Step

0.90
0.85

1.20
1.15

Disable, Indicative, Off Step

0.70
0.75

0.95
1.00

Disable, Indicative, Off Step

1.10
1.05

1.30
1.25

Disable, Indicative, Off Step

0.01
0.02

0.20
0.25

Disable, Indicative, Off Step

005%

100%

Disable, Indicative, Off Step

1.05
1.00
No
15

1.50
1.45
Yes
900

Disable, Indicative, Off Step

0.75
0.80

0.98
1.00

Disable, Indicative, Off Step

0.02
0.01
Disable
0.03
Disable
Disable

0.99
0.90
Enable
0.50
Enable
Enable

Menu
Step

Parameter
No. of Steps
Step Vol
Corr. Time
Discharge Time
Step 1 KVAR
Step 2 KVAR
Step 3 KVAR
Step 4 KVAR
Step 5 KVAR
Step 6 KVAR

Meaning of Parameter
Number of Capacitor steps utilised
Voltage at which kVAr is defined
Correction cycle time.
Capacitor discharge time.
Step 1 kVAr value.
Step 2 kVAr value.
Step 3 kVAr value.
Step 4 kVAr value.
Step 5 kVAr value.
Step 6 kVAr value.

Menu
Parameter
Meaning of Parameter
Communication Unit ID
Communication ID of the unit
Baud Rate
Serial communication baud rate.
Time
RTC time to be set
Date
RTC date to be set
Init RTC
Initialise RTC?
Clear NVRAM Clear all contents on NV RAM?

Default
3
440
120 secs
120 secs
006
009
018
018
018
018

Min
1
380
010
010
001
001
001
001
001
001

Default
3001
09600
--No
No

Min
0000
04800
--No
No

Max
6
660
240
240
250
250
250
250
250
250

Max
9999
38400
--Yes
Yes

Note that all the parameters in the Sub-Menu Level 2 should be carefully filled in the
SPF-25. Failing to put the correct parameters can make SPF-25 to malfunction.
Its therefore advised that a trained person should only be allowed to change these
values.

- 23 -

Commissioning Instructions :
before panel is powered up for the first time.
1. Panel Wiring Check
Ensure that all connections in the panel is tightened properly and there are no
loose connections. Also ensure that the wiring is done as per the wiring
diagram.
2. Power Wiring Check
Ensure that the power cables are connected properly from the Panel I/C to the
feeder I/C or the transformer bushings. The connection has to be after the
Load Feed back CT looking from the Transformer side.
Ensure that the Bus Bars and/or Lugs are clean and free of Dust, Corrosion or
Oxidation on the contact sides so that good electrical connection is maintained.
The surface area should be flat so as to get maximum contact area.
If required Clean the Bus Bars and/ or Lugs by rubbing it with Polish Paper to
remove the oxidation layer. Provide contact paste in between the contacts
surfaces.
Not performing this, can result in to a weaker source point for Capacitor
charging during Step on and this can generate undesirable Noise which can
hamper the performance of equipments installed in the capacitor panel.
3. Load Feed Back CT connection.
Ensure that the load feed back CT connections are done properly. Confirm that
correct phase CT is connected with the correct phase input terminals. (Even
though auto sync is capable of taking care of wrong CT polarities or CT
position interchanging, but then on display, the Phase readings may be seen to
be interchanged. (May be R-phase reading would be seen in B-phase and
vice-versa.
CT connections to be done carefully so as to ensure that the wire does not get
open and there is no loose connection.

Loose connection’s or open CT secondary can result in to very high voltages
getting developed in the circuit which can damage the CT and also produce
high levels of noise in the system.

- 24 -

Fault Finding Guidelines :

Fault Type

Probable Reason

Action to Take

Unit Does not
turn ON. No
display on LCD.

•Input auxiliary supply
not coming.
•Input side fuses
blown

•Check the input
supply to restore
•Check fuses in the
unit for OK.

Unit does not
turn On any
capacitors even
if PF is below
Lower PF limit.

•If auto-sync failure
message is there at
Power On.

• Load may be highly
fluctuating so need of
manual
synchronisation only.
• This is OK
condition.

• The load KW is too
low with Under load
fault enable condition.
•Control connections
from SPF-25 to
contactor coils are not
proper

•Check control supply
and connections from
SPF-25 to contactors.

BF indication on
Default display.

• Internal Ni-Cd
3.2Vdc battery used
for RTC and NV RAM
must be drained down.

• Replace this battery
in consultancy with
TAS trained
personnel.

Some Capacitor
banks are
declared as
faulty even if
they are
checked to be
OK.

•Individual step health
monitoring is enabled
and tolerance limits
set are too stringent.
• Capacitor current
THD factor is
continuously
fluctuating.

•Set the tolerance
limits for individual
steps monitoring as
relaxed.
• With continuously
fluctuating THD of
Capacitor current and
higher level of THD
can cause some
errors in individual
step KVAR
measurement. Under
this condition, best is
to keep this feature
disabled.

- 25 -

Fault Finding Guidelines (continued):

Fault Type

Probable Reason

Action to Take

Serial
Communication
is not working.

• Baud rate selection
is not proper.
• Unit ID is not set
properly.
• Serial
communication cable
connections are not
proper.

• Select proper baud
rate.
• Set the unit ID
correctly.
• Check the serial
cable continuity as
per the connections
given earlier in this
manual.

Data logging is
not taking place.

• Possible that RTC
date is not set
properly.

• Change the battery
by help of TAS’s
authorised person.

SPF-25 resets
occasionally on
turning OFF of
any contactor.

• The contactor supply
phase may be the
same as used for SPF25 auxiliary supply.
• RC snubbers/ free
wheeling diodes are
not put with contactor
coils.

• Use the different
phase for control
supply of contactors
and for SPF-25 supply
• Usage of RC
snubbers / free
wheeling diodes is
mandatory.

- 26 -

Corporate Office/Works/Design Centre:
W-61, MIDC, Ambad, Nasik - 422010, Maharashtra (India)
Tel: +91-(253)-2384038 / 2381090
Email: [email protected]
Marketing and After-Sales Service:
A/58, Kamal Pushpa, K.C. Road, Bandra, Mumbai-400050.
Tel: +91-9930513923
Email: [email protected]
Regional Office: Delhi
191-B, Ground Floor, Padam Nagar (Filter Market),
New Delhi - 110007 (India).
Tel: +91-9911615701
Email: [email protected]


Slide 22

Operations Manual
SPF-25/6
AUTOMATIC POWER FACTOR
CONTROLLER

TAS Powertek Pvt. Ltd.
Corporate Office:
W-61, MIDC, Ambad, Nasik - 422010, Maharashtra (India)
Tel: +91-(253)-2384038 / 2381090
Email: [email protected]

NOTE
These instructions do not purport to cover all details or
variations in equipment, nor to provide for every possible
contingency to be met in connection with installation,
operation or maintenance.

Should further information be desired or should particular
problems arise which are not covered sufficiently for the
purchasers purposes, the matter should be referred to our
TAS Powertek Pvt. Ltd., office.
The contents of this instruction Manual shall not become
part of or modify any prior or existing agreement or
relationship. The sales contract contains the entire
obligations of TAS Powertek Pvt. Ltd. The warranty
contained in the contract between the parties is the sole
warranty of TAS Powertek Pvt. Ltd. Any statements
contained herein do not create new warranties or modify the
existing warranty.

The reproduction, transmission or use of this
document or its contents is not permitted
without express written authority. Offenders
will be liable for damages. All rights are
reserved.

Index
Index Page
-----------------Features & Specifications
----------Mechanical Dimensions/ mounting --------Functional Block diagram
-----------------PF correction technique
-----------------Back Side terminals
-----------------------Typical wiring scheme ---------------------Front Facia
---------------------------------Communication connector connections ----Display of various parameters / Status ---Method of Keyboard/Display usage -------Parameter Submenu -----------------------Commissioning Instruction (before Powerup)
Fault finding Guidelines ---------------------

-1-

1
2
3
4
5
6
7
8
9
10
19
22
24
25

Features:
• Totally Micro-processor controlled Digital Signal processing
logic for measurements.
• All measurements with 1.0 class accuracy.
• Automatic Synchronisation capable of giving the correct
results for wrong connections at CT terminals (even wrong
polarity of CTs).
• Measurement and kVAr compensation are frequency / THD
compensated.
• Load V,Iph, In and Cap. current THD measurement.
• Up-to 6 output banks control.
• Capable of doing the kVAr measurements on basis of mean
of the correction cycle time and provide kVAr compensation.
• Standard 144 X 144 cabinet for panel door flush mounting.
• Serial communication through standard TAS protocols.
• Manual testing mode for user checking of the Capacitor steps
switching.
• Protections provided (user settable):
Over/under Voltage
Cap. Over/under current / THD.
Over/Under frequency (internally set limits)
Over / Under load.
Load unbalance.
Capacitor individual step kVAr monitoring.
Out of steps: Under-compensation (only for indication)
NV-RAM battery down.
• Data logging for various parameters for 2months period at an
interval of 1hr.
• Unit comes along with PC (Windows compatible) software
for downloading and viewing the logged data.

Specifications:
•
•
•
•
•
•
•
•
•
•
•
•

Feed-back Voltage:440Volt (+10%/-30%)
Current input : 1Amp for load and capacitor feed-back.
Measurement Accuracy: Class 1.0
Auxiliary Supply: 525Vac to 300Vac.
Correction / Discharge time:
Selectable in seconds from 10sec. to 240sec.
Output commands:
NO contacts each with current rating of 0.5Amp AC. at
240Vac.
RS-232 baud rate selectable from 4.8kBPS to 38.4kBPS.
Operating temperature: 0 to 55oC.
1.0class measurement Operating temperature: 0 to 50oC.
Storage temperature: -10 to +75oC.
Humidity: 0 to 98%.
Supply frequency: 45Hz to 55Hz.

-2-

Mechanical Dimensions:
135

144

135

120
144

6

Recommended size for cutout on panel door is 138 X 138.
All Dimensions given are in mm.

Maximum weight: (with clamps and terminals) = 2.5kg.

-3-

Functional Block Diagram:
3 channel
Current f.b.

3
Channel
Cap.
Current
f.b.

3 channel
Voltage f.b.

SPF-25

V, I, PF and Power
Measurement
Block
For every AC mains
Cycle.

Calculation
Block for
• Energy Parameters
• Harmonic analysis

EEPROM
For Data
Logging

Keyboard,
Display and
Other support
Functions
Block.

RS-232 Serial
Communication.
TAS-01
Protocol stack.

Power Factor
Correction Block
+ event monitoring.

Outputs Commands
For Capacitor
Switching.

Power Supply
Block.

Above block diagram gives the functional blocks that are built into SPF-25 PF
correction relay.
These blocks are made up with the combination of functions from hardware and
corresponding firmware that resides in the Program memory of the micro-processor
used therein.
Even though the basic blocks exists as shown in the diagram, there functionality is
interdependent. The entire combination is carefully designed so as to have
minimum effects of Electrical and Electromagnetic noise level on the functionality of
this SPF-25.
The firmware written takes into various error handling eventualities so that the
functioning of this PF relay is error free and highly reliable.

-4-

PF correction technique:
KVAr Inductive

Target
PF.
Cos Φ
= PF

1.5 X kVAr
Of Smallest
Capacitor bank

KW

No change band.
KVAr Capacitive
Capacitor Addition band.
Capacitor Removal band.
SPF-25 for kVAr compensation works with the kW v/s kVAr diagram as shown here
above.
A band is created across the target PF value. (Target PF is set by user). This band
is of +0.75 of the smallest capacitor bank kVAr. Thus, total band width is always 1.5
times the smallest capacitor bank kVAr used. This is a no change band. If the
mains source parameters are within this band, SPF-25 would not change the
capacitors bank status.
If the mains parameters are out of this “No change band”, then SPF-25 calculates
the correct capacitor bank combination to be added / subtracted and within one
correction cycle brings it within the No change band.
The no change band width is selected as mentioned because it has to prevent unnecessary hunting (switching on/off) of the capacitor banks.

-5-

Back Side terminals:

Voltage
Feed-Back

Auxiliary
Supply

Current
Feed-Back
Output commands.

-6-

Capacitor
Current
Feed-Back

Typical Wiring with SPF-25 PF correction system.
L
O
A
D

L
C
R
+

L
C
R
-

L
C
Y
+

L
C
Y
-

L
C
B
+

L
C
B
-

PH 3
PH 2
PH 1
CCR+
CCRCCY+
CCYCCB+
CCB-

S
P
F
2
5

Auxiliary
Supply

L1
L2

Com
C01
C02
|

C06

Mains Connections:
Phase 1 control:
Neutral control:
Commands:
Load Current CT:
Capacitor Current CT:

-7-

Front Facia of SPF-25:
LCD Display

Step status LED indication
Serial Communication Port

Membrane Keypad

Usage of the UP and DN key makes the LCD display to scroll up
and down. This is used for display of various status as well as for
viewing the On line measured electrical values.
These keys are also used for changing values in Parameters
Editing mode and used for status changing of banks in Manual
mode.
Usage of ENT key is for entering the submenu and / or for setting
up some values.
The L and R keys are used in changing the position of the cursor
from Left to Right and vice-versa.

-8-

RS-232 serial communication 9 pin D connector:

5

4

6

3

7

2

8

1

9
RXD

GND

TXD

RS-232 cable connection Details:

PIN
NO

PC side
Connection

CONNECTION

SPF-25

1

NC

2

RXD

TXD

3

TXD

RXD

GND

GND

4
5
6
7
8
9

NC

-9-

Display of Various Parameters / Status:
PAGE: 00

COSΦ= -0.99 A OK

This is default display screen giving
information on PF, mode and
working status.

COSΦ= -0.99 :This part of the display indicates the Power Factor running value. The
sign –ve indicates that PF is Capacitive and no sign (+ve) indicates that PF is Inductive.
The PF indicated is the overall PF of the three phase system.
A or M :
This part either indicates the letter “A” or letter “M”. The letter A means
that SPF-25 is working in Auto mode.
The letter M means that SPF-25 is presently in Manual mode.
The Auto or Manual modes can be selected by pressing ENT key on this page.
(If Password option is enabled, enter the same by using UP/DN/L/R keys and then
Pressing ENT)
Then by UP or DN key you can stroll between the displays:
“1. Edit Mode”, “2. Auto Mode”, “3.Manual Mode”.
The first one “1.Edit Mode” is for parameter changing. The details of parameter changing
are explained in detail in later part of this manual.
The second and third one as display indicates are for selecting Auto or Manual mode
respectively. The ENT key pressed on selecting the mode desired, puts the SPF-25 into
that mode.
Auto Mode: In this mode SPF-25 works in automatic mode. It switches the capacitor
banks automatically depending on the parameter setting of target PF. This mode is the
default mode and is to be used for unmanned operation of the system controlled by
SPF-25.
Manual Mode: This mode is activated for checking/testing the capacitor banks switching.
Its also used for changing the Masking status of the capacitor banks. More on this is
explained later. (On Page 01 explanation)
OK or ** :
The last part of the display that is blinking every 500mS indicates the
working status of SPF-25. “OK” indicates that unit is working fine without any trip
conditions. If there is other indication, the meaning of the same can be as:
OK
:
No Fault
OC
:
Over Capacitor Current
UC
:
Under Capacitor Current
OL
:
Over Load
UL
:
Under Load
OV
:
Over Voltage
UV
:
Under Voltage
OF
:
Over Frequency
UF
:
Under Frequency
OH
:
Over Capacitor Current THD %.
OB
:
Out of Banks
LU
:
Load Unbalance
BF
:
Battery Failure (RTC)
NV
:
NVRAM Checksum Error
VA
:
Voltage Absent
- 10 -

PAGE: 01

PAGE: 01

______

AUTO

______

MAN

This display indicates the Bank status in Auto mode and in Manual mode it helps
to make the specific bank On or Off or declare masked.
: Means Bank is On.
: Means Bank is Off.
: Means Bank is Off and is declared masked (out of action)
: Means Bank does not exist for compensation.
When the Page 01 is in Auto mode, its only for indication of Bank status.
But in Manual mode, the “ENT” key press activates the manual control
mode. The cursor over the bank number starts blinking. The UP and DN
keys can turn On and Off the respective bank.
The DN key pressed puts the respective bank in Masking mode and another
press of DN key brings it out of Masking mode.

Putting the bank masking status permanently:
If a bank is to be permanently put in masked mode or is to be brought out of
permanent masked mode, it can be done by bringing the blinking cursor on
the position of the respective bank by use of L or R key. Then by pressing
DN key, bring the status of the bank to the required level (Masked or
Unmasked). Then press ENT key so that cursor stops blinking. After that by
pressing UP key go to Page 00. Then Press ENT. (If Password option is
enabled, enter the same by using UP/DN/L/R keys and then Press ENT)
“1.EDIT MODE” would be displayed. Press ENT one more time. “1.General
and IO” would be displayed. Press ENT again. “Pwd : Disable” or “Pwd :
Enable” would be displayed. Press UP key. “Exit: No Save” would be
displayed. Press ENT so that cursor will start blinking. Press UP. “Exit: With
Save” would be displayed with cursor blinking. Press ENT. “Saving in
EEPROM” would be displayed for a short time and then Page 00 would be
displayed.
You will observe that the bank status as requirement is changed
permanently to the status desired.

- 11 -

PAGE: 02

1.Overall Values
PRESS
PAGE: 02.1

Avg Vol: 415.7 V
PAGE: 02.2

Avg Cur: 0123.4A
PAGE: 02.3

Tot KW:

0081.2

PAGE: 02.4

TotKVAR: 0024.6
PAGE: 02.5

Tot KVA: 0101.1
PAGE: 02.6

Avg CC:

0031.3A

PAGE: 02.7

CKVAR:

028.35

PAGE: 02.8

LS PF:

0.82

PAGE: 02.9

LS KVAR: 0043.9
PAGE: 02.10

LS KVA:

0125.7

PAGE: 02.11

Freq:

49.9Hz

The Overall values Display menu has submenus as displayed above. As its
self explanatory it means:
Avg Vol: Average voltage of all the three line to line voltage values.
Avg Cur: Average current of all the three phase line current values.
Tot KW: Overall kW of the three phase system measured at source.
TotKVAR: Overall kVAr of the three phase system measured at source.
Tot KVA: Overall kVA of the three phase system measured at source.
Avg CC: Average of three phase current through capacitor panel.
CKVAR: Capacitive kVAr that is compensated by the system.
LS PF: Load side PF. (PF value if not compensated.
LS KVAR: Load side kVAr.
LS KVA: Load side kVA.
Freq: Supply frequency in Hz.
- 12 -

PAGE: 03

2.Per-Phase RMS

PRESS
PAGE: 03.1

R-Y Vol: 415.7 V
PAGE: 03.2

Y-B Vol: 415.7 V
PAGE: 03.3

B-R Vol: 415.7 V
PAGE: 03.4

Rph Cur: 0110.8A
PAGE: 03.5

Yph Cur: 0110.8A
PAGE: 03.6

Bph Cur: 0110.8A
PAGE: 03.7

Neutral: 0010.2A
PAGE: 03.8

Rph Cap: 0022.5A
PAGE: 03.9

Yph Cap: 0022.5A
PAGE: 03.10

Bph Cap: 0022.5A

Per Phase RMS: Submenu:
R-Y Vol: Measured AC Voltage RMS value across R and Y phase.
Y-B Vol: Measured AC Voltage RMS value across Y and B phase.
B-R Vol: Measured AC Voltage RMS value across B and R phase.
Rph Cur: Line current RMS value in R phase. Mains source.
Yph Cur: Line current RMS value in Y phase. Mains source.
Bph Cur: Line current RMS value in B phase. Mains source.
Neutral: Neutral current RMS value.
Rph Cap: Capacitor current RMS value in R phase.
Yph Cap: Capacitor current RMS value in Y phase.
Bph Cap: Capacitor current RMS value in B phase.

- 13 -

PAGE: 04

3.Power
PRESS
PAGE: 04.1

Rph PF:

PAGE: 04.10

1.00

Rph KVA: 0109.7

PAGE: 04.2

Yph PF:

PAGE: 04.11

1.00

Yph KVA: 0109.7

PAGE: 04.3

Bph PF:

PAGE: 04.12

1.00

Bph KVA: 0109.7

PAGE: 04.4

Rph KW:

PAGE: 04.13

0100.2

RphCKVAR: 010.76

PAGE: 04.5

Yph KW:

PAGE: 04.14

0100.2

YphCKVAR: 010.76

PAGE: 04.6

Bph KW:

PAGE: 04.15

0100.2

BphCKVAR: 010.76

PAGE: 04.7

PAGE: 04.16

RphKVAR: 0020.4

Rph mF

PAGE: 04.8

: 165.06

PAGE: 04.17

YphKVAR: 0020.4

Yph mF

PAGE: 04.9

: 165.06

PAGE: 04.18

BphKVAR: 0020.4

Bph mF

: 165.06

Power: Submenu:
Rph PF: Power Factor of R phase on mains source.
Yph PF: Power Factor of Y phase on mains source.
Bph PF: Power Factor of B phase on mains source.
Rph kW: Active Power in kW in R-phase.
Yph kW: Active Power in kW in Y-phase.
Bph kW: Active Power in kW in B-phase.
RphkVAR: Reactive Power in kVAr in R-phase.
YphkVAR: Reactive Power in kVAr in Y-phase.
BphkVAR: Reactive Power in kVAr in B-phase.
Rph KVA: Apparent Power in kVA in R-phase.
Yph KVA: Apparent Power in kVA in Y-phase.
Bph KVA: Apparent Power in kVA in B-phase.
RphCKVAR: Capacitor injected reactive power in R-phase.
YphCKVAR: Capacitor injected reactive power in Y-phase.
BphCKVAR: Capacitor injected reactive power in B-phase.
Rph mF: Capacitor value in micro-farad in R-phase.
Yph mF: Capacitor value in micro-farad in Y-phase.
Bph mF: Capacitor value in micro-farad in B-phase.
- 14 -

PAGE: 05

4.Energy
PRESS
PAGE: 05.1

KWH:

1234567.8

PAGE: 05.2

IndKVARH:12345.6
PAGE: 05.3

CapKVARH:12345.6
PAGE: 05.4

KVAH:

1234567.8

PAGE: 05.5

CKVARH:1234567.8

Energy: Submenu:
KWH: Overall cumulative active energy in kWh on Mains supply.
IndKVARH: Inductive reactive energy in kVArh on Mains supply.
CapKVARH: Capacitive reactive energy in kVArh on Mains supply.
KVAH: Overall cumulative apparent energy in kVA on Mains supply.
CKVARH: Capacitor compensated reactive energy in kVArh.

- 15 -

PAGE: 06

5.Harmonics
PRESS
PAGE: 06.1

Vr-THD-F: 002.4%
PAGE: 06.2

Vy-THD-F: 002.4%
PAGE: 06.3

Vb-THD-F: 002.4%
PAGE: 06.4

Ir-THD-F: 012.5%
PAGE: 06.5

Iy-THD-F: 012.5%
PAGE: 06.6

Ib-THD-F: 012.5%
PAGE: 06.7

In-THD-F: 005.0%
PAGE: 06.8

CCr-THD-F:028.2%
PAGE: 06.9

CCy-THD-F:028.2%
PAGE: 06.10

CCb-THD-F:028.2%

Harmonics: Submenu:
Vr-THD-F/R: R-Y line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Vy-THD-F/R: Y-B line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Vb-THD-F/R: B-R line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Ir-THD-F/R: R phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Iy-THD-F/R: Y phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Ib-THD-F/R: B phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
In-THD-F/R: Neutral current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
CCr-THD-F/R: R phase Capacitor current % Total Harmonic Distortion.
CCy-THD-F/R: Y phase Capacitor current % Total Harmonic Distortion.
CCb-THD-F/R: B phase Capacitor current % Total Harmonic Distortion.

- 16 -

PAGE: 07

6.Step KVAR
PRESS
PAGE: 07.1

Stp1 KVAR:0009.0
PAGE: 07.2

Stp2 KVAR:0009.0
PAGE: 07.3

Stp3 KVAR:0009.0
PAGE: 07.4

Stp4 KVAR:0009.0
PAGE: 07.5

Stp5 KVAR:0009.0
PAGE: 07.6

Stp6 KVAR:0009.0

Step KVAR: Submenu:
Stp1 KVAR: Step 1 kVAr value normalized at Capacitor rated voltage.
Stp2 KVAR: Step 2 kVAr value normalized at Capacitor rated voltage.
Stp3 KVAR: Step 3 kVAr value normalized at Capacitor rated voltage.
Stp4 KVAR: Step 4 kVAr value normalized at Capacitor rated voltage.
Stp5 KVAR: Step 5 kVAr value normalized at Capacitor rated voltage.
Stp6 KVAR: Step 6 kVAr value normalized at Capacitor rated voltage.

- 17 -

PAGE: 08

Time: 10:10:00
Real Time Clock: RTC time set in the SPF-25 is displayed here. Its in
HH:MM:SS format.

PAGE: 09

Date: 07:11:06
Real Time Clock: RTC date set in the SPF-25 is displayed here. Its in
dd:mm:yy format.

PAGE: 10

SPF-25 1.0.6

SPF-25 internal firmware version number is displayed here. (Just for user
information)

Total number of Main display pages are 11nos ranging from “00” to
“10”.

- 18 -

Method for Keyboard/Display usage.

Flow chart for entering into different modes:

PRESS
Enable

Default
Display
mode

If Password
Option is
Enable/Disable.

Disable

Enter Pwd: ****
PRESS
Enter the 4
Digit password
By use of
L, R, UP & DN
Keys.

PRESS

NO

IF
PASSWORD
Correct?

*

YES
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

1.Edit Mode

2.Auto Mode

3.Manual Mode

- 19 -

Parameter Editing Submenu Level 1:

*
1.General
2.System
3.Fault
4.Step
5.Communication

Sub-menu
Level 1
for
Parameter
Editing.

Parameter Editing
Sub-Menu
LEVEL 2

1.General and IO: Parameters related with general function and Input/Output
2. System: Electrical system (Mains supply) related parameters.

3. Fault: Setting Faults and fault levels.
4. Step: Capacitor Steps related parameters.
5. Communication: Parameters related with communication and data logging.

- 20 -

Parameter Editing Method:
(For Submenu Level 2 : L2)

Sub-Menu Level 1.
Cursor Blinking
at Parameter Values.

1.Submenu L2: ****

1.Submenu L2: ****
PRESS

key to increment value.

PRESS

Key to decrement value.

PRESS

Key to shift cursor Left.

PRESS

Key to shift cursor Right.
2.Submenu L2: ****

2.Submenu L2: ****
PRESS

key to increment value.

PRESS

Key to decrement value.

PRESS

Key to shift cursor Left.

PRESS

Key to shift cursor Right.

3.Submenu L2: ****

Exit: No Save

Exit: No Save

Without saving

Default
Display.

With saving

Screen for 1second

Saving In EEProm

Exit: With Save

- 21 -

Parameter Editing Submenu Level 2:
Menu
General

Parameter
Pwd
Ch-Pwd
Ld Def
THD
Rst. Energy

Meaning of Parameter
Password Control
Password value
Load all factory default parameters.
Type of THD factor to be displayed
Energy Counters reset to zero option

Default
Enable
1111
No
F-THD
No

Menu
System

Parameter
Meas. Vol.
Ld. Cur. Pr.
Cap. Cur. Pr.
PF Target
PF Target
Auto Sync
Async Tol.
Reset Async

Meaning of Parameter
Default
SPF-25 rated measurement voltage
440
Primary current value of mains CT
0180
0075
Primary current value of capacitor CT
Target PF for deciding Lag or Lead
Lag
1.00
Target PF exact value
Automatic synchronisation requirement Yes
% load variation tolerence for Auto-sync. 30
No
Reset Auto-sync to default value.

Menu
Fault

Parameter
Over Vol.
Over Vol. Lim
Over Vol. Clr
Under Vol.
Under Vol. Lim
Under Vol. Clr
Over Load
Over Ld. Lim
Over Ld. Clr
Under Ld.
Under Ld. Lim
Under Ld. Clr
Ld. Unbalance
Ld. Unb. Lim
Over CC
Over CC. Lim
Over CC. Clr
Over CC. Rst.
Over CC. Rst.
Under CC.
Under CC. Lim
Under CC. CLr
CC THD
CC THD Lim
CC THD Clr
Step Check
Cap. Cur Tol
Under Comp.
RTC Bat

Meaning of Parameter
Default
Over Voltage Fault: action by PDE-30 Off Step
Over Voltage activation limit value
1.10
Over Voltage resumption limit value 1.05
Under Voltage Fault: Action?
Off Step
Under Voltage activation limit value 0.70
Under Voltage resumption limit value 0.75
Over Load Fault: Action?
Indicate
Mains current over load limit value
1.30
Mains cur. over load resume value
1.25
Under Load on Mains: Action?
Indicate
Under load Activation limit value
0.03
Under load Resumption limit value
0.05
Load Un-balance Fault: Action?
Off Step
Load Un-balance limit
025%
Capacitor Over Current Fault: Action? Disable
Cap. Over Current Limit value.
1.30
Cap. Over Current Resume value.
1.25
Auto reset feature on Cap. Over Cur. No
If Over CC. Rst.=Yes. Time for reset. 120 sec
Under Capacitor current fault: Action? Disable
Under Cap. Cur. Limit value.
0.95
Under Cap. Cur. Resume value.
0.97
Capacitor current Over THD: Action? Disable
Cap.Cur. Over THD limit value.
0.10
Cap.Cur. Over THD resume value.
0.08
Every step kVAr healthiness monitor. Disable
Step kVAr healthiness: tolerence.
0.10
Out of Banks Indication.
Disable
RTC Battery fault monitoring.
Enable

- 22 -

Min
Disable
0000
No
R-THD
No
Min
Non
0001
0001
Lead
0.70Lag
No
01
No

Min

Max
Enable
9999
Yes
F-THD
Yes
Max
Edible
9999
9999
Lag
0.85Lead
Yes
50
Yes

Max

Disable, Indicative, Off Step

0.90
0.85

1.20
1.15

Disable, Indicative, Off Step

0.70
0.75

0.95
1.00

Disable, Indicative, Off Step

1.10
1.05

1.30
1.25

Disable, Indicative, Off Step

0.01
0.02

0.20
0.25

Disable, Indicative, Off Step

005%

100%

Disable, Indicative, Off Step

1.05
1.00
No
15

1.50
1.45
Yes
900

Disable, Indicative, Off Step

0.75
0.80

0.98
1.00

Disable, Indicative, Off Step

0.02
0.01
Disable
0.03
Disable
Disable

0.99
0.90
Enable
0.50
Enable
Enable

Menu
Step

Parameter
No. of Steps
Step Vol
Corr. Time
Discharge Time
Step 1 KVAR
Step 2 KVAR
Step 3 KVAR
Step 4 KVAR
Step 5 KVAR
Step 6 KVAR

Meaning of Parameter
Number of Capacitor steps utilised
Voltage at which kVAr is defined
Correction cycle time.
Capacitor discharge time.
Step 1 kVAr value.
Step 2 kVAr value.
Step 3 kVAr value.
Step 4 kVAr value.
Step 5 kVAr value.
Step 6 kVAr value.

Menu
Parameter
Meaning of Parameter
Communication Unit ID
Communication ID of the unit
Baud Rate
Serial communication baud rate.
Time
RTC time to be set
Date
RTC date to be set
Init RTC
Initialise RTC?
Clear NVRAM Clear all contents on NV RAM?

Default
3
440
120 secs
120 secs
006
009
018
018
018
018

Min
1
380
010
010
001
001
001
001
001
001

Default
3001
09600
--No
No

Min
0000
04800
--No
No

Max
6
660
240
240
250
250
250
250
250
250

Max
9999
38400
--Yes
Yes

Note that all the parameters in the Sub-Menu Level 2 should be carefully filled in the
SPF-25. Failing to put the correct parameters can make SPF-25 to malfunction.
Its therefore advised that a trained person should only be allowed to change these
values.

- 23 -

Commissioning Instructions :
before panel is powered up for the first time.
1. Panel Wiring Check
Ensure that all connections in the panel is tightened properly and there are no
loose connections. Also ensure that the wiring is done as per the wiring
diagram.
2. Power Wiring Check
Ensure that the power cables are connected properly from the Panel I/C to the
feeder I/C or the transformer bushings. The connection has to be after the
Load Feed back CT looking from the Transformer side.
Ensure that the Bus Bars and/or Lugs are clean and free of Dust, Corrosion or
Oxidation on the contact sides so that good electrical connection is maintained.
The surface area should be flat so as to get maximum contact area.
If required Clean the Bus Bars and/ or Lugs by rubbing it with Polish Paper to
remove the oxidation layer. Provide contact paste in between the contacts
surfaces.
Not performing this, can result in to a weaker source point for Capacitor
charging during Step on and this can generate undesirable Noise which can
hamper the performance of equipments installed in the capacitor panel.
3. Load Feed Back CT connection.
Ensure that the load feed back CT connections are done properly. Confirm that
correct phase CT is connected with the correct phase input terminals. (Even
though auto sync is capable of taking care of wrong CT polarities or CT
position interchanging, but then on display, the Phase readings may be seen to
be interchanged. (May be R-phase reading would be seen in B-phase and
vice-versa.
CT connections to be done carefully so as to ensure that the wire does not get
open and there is no loose connection.

Loose connection’s or open CT secondary can result in to very high voltages
getting developed in the circuit which can damage the CT and also produce
high levels of noise in the system.

- 24 -

Fault Finding Guidelines :

Fault Type

Probable Reason

Action to Take

Unit Does not
turn ON. No
display on LCD.

•Input auxiliary supply
not coming.
•Input side fuses
blown

•Check the input
supply to restore
•Check fuses in the
unit for OK.

Unit does not
turn On any
capacitors even
if PF is below
Lower PF limit.

•If auto-sync failure
message is there at
Power On.

• Load may be highly
fluctuating so need of
manual
synchronisation only.
• This is OK
condition.

• The load KW is too
low with Under load
fault enable condition.
•Control connections
from SPF-25 to
contactor coils are not
proper

•Check control supply
and connections from
SPF-25 to contactors.

BF indication on
Default display.

• Internal Ni-Cd
3.2Vdc battery used
for RTC and NV RAM
must be drained down.

• Replace this battery
in consultancy with
TAS trained
personnel.

Some Capacitor
banks are
declared as
faulty even if
they are
checked to be
OK.

•Individual step health
monitoring is enabled
and tolerance limits
set are too stringent.
• Capacitor current
THD factor is
continuously
fluctuating.

•Set the tolerance
limits for individual
steps monitoring as
relaxed.
• With continuously
fluctuating THD of
Capacitor current and
higher level of THD
can cause some
errors in individual
step KVAR
measurement. Under
this condition, best is
to keep this feature
disabled.

- 25 -

Fault Finding Guidelines (continued):

Fault Type

Probable Reason

Action to Take

Serial
Communication
is not working.

• Baud rate selection
is not proper.
• Unit ID is not set
properly.
• Serial
communication cable
connections are not
proper.

• Select proper baud
rate.
• Set the unit ID
correctly.
• Check the serial
cable continuity as
per the connections
given earlier in this
manual.

Data logging is
not taking place.

• Possible that RTC
date is not set
properly.

• Change the battery
by help of TAS’s
authorised person.

SPF-25 resets
occasionally on
turning OFF of
any contactor.

• The contactor supply
phase may be the
same as used for SPF25 auxiliary supply.
• RC snubbers/ free
wheeling diodes are
not put with contactor
coils.

• Use the different
phase for control
supply of contactors
and for SPF-25 supply
• Usage of RC
snubbers / free
wheeling diodes is
mandatory.

- 26 -

Corporate Office/Works/Design Centre:
W-61, MIDC, Ambad, Nasik - 422010, Maharashtra (India)
Tel: +91-(253)-2384038 / 2381090
Email: [email protected]
Marketing and After-Sales Service:
A/58, Kamal Pushpa, K.C. Road, Bandra, Mumbai-400050.
Tel: +91-9930513923
Email: [email protected]
Regional Office: Delhi
191-B, Ground Floor, Padam Nagar (Filter Market),
New Delhi - 110007 (India).
Tel: +91-9911615701
Email: [email protected]


Slide 23

Operations Manual
SPF-25/6
AUTOMATIC POWER FACTOR
CONTROLLER

TAS Powertek Pvt. Ltd.
Corporate Office:
W-61, MIDC, Ambad, Nasik - 422010, Maharashtra (India)
Tel: +91-(253)-2384038 / 2381090
Email: [email protected]

NOTE
These instructions do not purport to cover all details or
variations in equipment, nor to provide for every possible
contingency to be met in connection with installation,
operation or maintenance.

Should further information be desired or should particular
problems arise which are not covered sufficiently for the
purchasers purposes, the matter should be referred to our
TAS Powertek Pvt. Ltd., office.
The contents of this instruction Manual shall not become
part of or modify any prior or existing agreement or
relationship. The sales contract contains the entire
obligations of TAS Powertek Pvt. Ltd. The warranty
contained in the contract between the parties is the sole
warranty of TAS Powertek Pvt. Ltd. Any statements
contained herein do not create new warranties or modify the
existing warranty.

The reproduction, transmission or use of this
document or its contents is not permitted
without express written authority. Offenders
will be liable for damages. All rights are
reserved.

Index
Index Page
-----------------Features & Specifications
----------Mechanical Dimensions/ mounting --------Functional Block diagram
-----------------PF correction technique
-----------------Back Side terminals
-----------------------Typical wiring scheme ---------------------Front Facia
---------------------------------Communication connector connections ----Display of various parameters / Status ---Method of Keyboard/Display usage -------Parameter Submenu -----------------------Commissioning Instruction (before Powerup)
Fault finding Guidelines ---------------------

-1-

1
2
3
4
5
6
7
8
9
10
19
22
24
25

Features:
• Totally Micro-processor controlled Digital Signal processing
logic for measurements.
• All measurements with 1.0 class accuracy.
• Automatic Synchronisation capable of giving the correct
results for wrong connections at CT terminals (even wrong
polarity of CTs).
• Measurement and kVAr compensation are frequency / THD
compensated.
• Load V,Iph, In and Cap. current THD measurement.
• Up-to 6 output banks control.
• Capable of doing the kVAr measurements on basis of mean
of the correction cycle time and provide kVAr compensation.
• Standard 144 X 144 cabinet for panel door flush mounting.
• Serial communication through standard TAS protocols.
• Manual testing mode for user checking of the Capacitor steps
switching.
• Protections provided (user settable):
Over/under Voltage
Cap. Over/under current / THD.
Over/Under frequency (internally set limits)
Over / Under load.
Load unbalance.
Capacitor individual step kVAr monitoring.
Out of steps: Under-compensation (only for indication)
NV-RAM battery down.
• Data logging for various parameters for 2months period at an
interval of 1hr.
• Unit comes along with PC (Windows compatible) software
for downloading and viewing the logged data.

Specifications:
•
•
•
•
•
•
•
•
•
•
•
•

Feed-back Voltage:440Volt (+10%/-30%)
Current input : 1Amp for load and capacitor feed-back.
Measurement Accuracy: Class 1.0
Auxiliary Supply: 525Vac to 300Vac.
Correction / Discharge time:
Selectable in seconds from 10sec. to 240sec.
Output commands:
NO contacts each with current rating of 0.5Amp AC. at
240Vac.
RS-232 baud rate selectable from 4.8kBPS to 38.4kBPS.
Operating temperature: 0 to 55oC.
1.0class measurement Operating temperature: 0 to 50oC.
Storage temperature: -10 to +75oC.
Humidity: 0 to 98%.
Supply frequency: 45Hz to 55Hz.

-2-

Mechanical Dimensions:
135

144

135

120
144

6

Recommended size for cutout on panel door is 138 X 138.
All Dimensions given are in mm.

Maximum weight: (with clamps and terminals) = 2.5kg.

-3-

Functional Block Diagram:
3 channel
Current f.b.

3
Channel
Cap.
Current
f.b.

3 channel
Voltage f.b.

SPF-25

V, I, PF and Power
Measurement
Block
For every AC mains
Cycle.

Calculation
Block for
• Energy Parameters
• Harmonic analysis

EEPROM
For Data
Logging

Keyboard,
Display and
Other support
Functions
Block.

RS-232 Serial
Communication.
TAS-01
Protocol stack.

Power Factor
Correction Block
+ event monitoring.

Outputs Commands
For Capacitor
Switching.

Power Supply
Block.

Above block diagram gives the functional blocks that are built into SPF-25 PF
correction relay.
These blocks are made up with the combination of functions from hardware and
corresponding firmware that resides in the Program memory of the micro-processor
used therein.
Even though the basic blocks exists as shown in the diagram, there functionality is
interdependent. The entire combination is carefully designed so as to have
minimum effects of Electrical and Electromagnetic noise level on the functionality of
this SPF-25.
The firmware written takes into various error handling eventualities so that the
functioning of this PF relay is error free and highly reliable.

-4-

PF correction technique:
KVAr Inductive

Target
PF.
Cos Φ
= PF

1.5 X kVAr
Of Smallest
Capacitor bank

KW

No change band.
KVAr Capacitive
Capacitor Addition band.
Capacitor Removal band.
SPF-25 for kVAr compensation works with the kW v/s kVAr diagram as shown here
above.
A band is created across the target PF value. (Target PF is set by user). This band
is of +0.75 of the smallest capacitor bank kVAr. Thus, total band width is always 1.5
times the smallest capacitor bank kVAr used. This is a no change band. If the
mains source parameters are within this band, SPF-25 would not change the
capacitors bank status.
If the mains parameters are out of this “No change band”, then SPF-25 calculates
the correct capacitor bank combination to be added / subtracted and within one
correction cycle brings it within the No change band.
The no change band width is selected as mentioned because it has to prevent unnecessary hunting (switching on/off) of the capacitor banks.

-5-

Back Side terminals:

Voltage
Feed-Back

Auxiliary
Supply

Current
Feed-Back
Output commands.

-6-

Capacitor
Current
Feed-Back

Typical Wiring with SPF-25 PF correction system.
L
O
A
D

L
C
R
+

L
C
R
-

L
C
Y
+

L
C
Y
-

L
C
B
+

L
C
B
-

PH 3
PH 2
PH 1
CCR+
CCRCCY+
CCYCCB+
CCB-

S
P
F
2
5

Auxiliary
Supply

L1
L2

Com
C01
C02
|

C06

Mains Connections:
Phase 1 control:
Neutral control:
Commands:
Load Current CT:
Capacitor Current CT:

-7-

Front Facia of SPF-25:
LCD Display

Step status LED indication
Serial Communication Port

Membrane Keypad

Usage of the UP and DN key makes the LCD display to scroll up
and down. This is used for display of various status as well as for
viewing the On line measured electrical values.
These keys are also used for changing values in Parameters
Editing mode and used for status changing of banks in Manual
mode.
Usage of ENT key is for entering the submenu and / or for setting
up some values.
The L and R keys are used in changing the position of the cursor
from Left to Right and vice-versa.

-8-

RS-232 serial communication 9 pin D connector:

5

4

6

3

7

2

8

1

9
RXD

GND

TXD

RS-232 cable connection Details:

PIN
NO

PC side
Connection

CONNECTION

SPF-25

1

NC

2

RXD

TXD

3

TXD

RXD

GND

GND

4
5
6
7
8
9

NC

-9-

Display of Various Parameters / Status:
PAGE: 00

COSΦ= -0.99 A OK

This is default display screen giving
information on PF, mode and
working status.

COSΦ= -0.99 :This part of the display indicates the Power Factor running value. The
sign –ve indicates that PF is Capacitive and no sign (+ve) indicates that PF is Inductive.
The PF indicated is the overall PF of the three phase system.
A or M :
This part either indicates the letter “A” or letter “M”. The letter A means
that SPF-25 is working in Auto mode.
The letter M means that SPF-25 is presently in Manual mode.
The Auto or Manual modes can be selected by pressing ENT key on this page.
(If Password option is enabled, enter the same by using UP/DN/L/R keys and then
Pressing ENT)
Then by UP or DN key you can stroll between the displays:
“1. Edit Mode”, “2. Auto Mode”, “3.Manual Mode”.
The first one “1.Edit Mode” is for parameter changing. The details of parameter changing
are explained in detail in later part of this manual.
The second and third one as display indicates are for selecting Auto or Manual mode
respectively. The ENT key pressed on selecting the mode desired, puts the SPF-25 into
that mode.
Auto Mode: In this mode SPF-25 works in automatic mode. It switches the capacitor
banks automatically depending on the parameter setting of target PF. This mode is the
default mode and is to be used for unmanned operation of the system controlled by
SPF-25.
Manual Mode: This mode is activated for checking/testing the capacitor banks switching.
Its also used for changing the Masking status of the capacitor banks. More on this is
explained later. (On Page 01 explanation)
OK or ** :
The last part of the display that is blinking every 500mS indicates the
working status of SPF-25. “OK” indicates that unit is working fine without any trip
conditions. If there is other indication, the meaning of the same can be as:
OK
:
No Fault
OC
:
Over Capacitor Current
UC
:
Under Capacitor Current
OL
:
Over Load
UL
:
Under Load
OV
:
Over Voltage
UV
:
Under Voltage
OF
:
Over Frequency
UF
:
Under Frequency
OH
:
Over Capacitor Current THD %.
OB
:
Out of Banks
LU
:
Load Unbalance
BF
:
Battery Failure (RTC)
NV
:
NVRAM Checksum Error
VA
:
Voltage Absent
- 10 -

PAGE: 01

PAGE: 01

______

AUTO

______

MAN

This display indicates the Bank status in Auto mode and in Manual mode it helps
to make the specific bank On or Off or declare masked.
: Means Bank is On.
: Means Bank is Off.
: Means Bank is Off and is declared masked (out of action)
: Means Bank does not exist for compensation.
When the Page 01 is in Auto mode, its only for indication of Bank status.
But in Manual mode, the “ENT” key press activates the manual control
mode. The cursor over the bank number starts blinking. The UP and DN
keys can turn On and Off the respective bank.
The DN key pressed puts the respective bank in Masking mode and another
press of DN key brings it out of Masking mode.

Putting the bank masking status permanently:
If a bank is to be permanently put in masked mode or is to be brought out of
permanent masked mode, it can be done by bringing the blinking cursor on
the position of the respective bank by use of L or R key. Then by pressing
DN key, bring the status of the bank to the required level (Masked or
Unmasked). Then press ENT key so that cursor stops blinking. After that by
pressing UP key go to Page 00. Then Press ENT. (If Password option is
enabled, enter the same by using UP/DN/L/R keys and then Press ENT)
“1.EDIT MODE” would be displayed. Press ENT one more time. “1.General
and IO” would be displayed. Press ENT again. “Pwd : Disable” or “Pwd :
Enable” would be displayed. Press UP key. “Exit: No Save” would be
displayed. Press ENT so that cursor will start blinking. Press UP. “Exit: With
Save” would be displayed with cursor blinking. Press ENT. “Saving in
EEPROM” would be displayed for a short time and then Page 00 would be
displayed.
You will observe that the bank status as requirement is changed
permanently to the status desired.

- 11 -

PAGE: 02

1.Overall Values
PRESS
PAGE: 02.1

Avg Vol: 415.7 V
PAGE: 02.2

Avg Cur: 0123.4A
PAGE: 02.3

Tot KW:

0081.2

PAGE: 02.4

TotKVAR: 0024.6
PAGE: 02.5

Tot KVA: 0101.1
PAGE: 02.6

Avg CC:

0031.3A

PAGE: 02.7

CKVAR:

028.35

PAGE: 02.8

LS PF:

0.82

PAGE: 02.9

LS KVAR: 0043.9
PAGE: 02.10

LS KVA:

0125.7

PAGE: 02.11

Freq:

49.9Hz

The Overall values Display menu has submenus as displayed above. As its
self explanatory it means:
Avg Vol: Average voltage of all the three line to line voltage values.
Avg Cur: Average current of all the three phase line current values.
Tot KW: Overall kW of the three phase system measured at source.
TotKVAR: Overall kVAr of the three phase system measured at source.
Tot KVA: Overall kVA of the three phase system measured at source.
Avg CC: Average of three phase current through capacitor panel.
CKVAR: Capacitive kVAr that is compensated by the system.
LS PF: Load side PF. (PF value if not compensated.
LS KVAR: Load side kVAr.
LS KVA: Load side kVA.
Freq: Supply frequency in Hz.
- 12 -

PAGE: 03

2.Per-Phase RMS

PRESS
PAGE: 03.1

R-Y Vol: 415.7 V
PAGE: 03.2

Y-B Vol: 415.7 V
PAGE: 03.3

B-R Vol: 415.7 V
PAGE: 03.4

Rph Cur: 0110.8A
PAGE: 03.5

Yph Cur: 0110.8A
PAGE: 03.6

Bph Cur: 0110.8A
PAGE: 03.7

Neutral: 0010.2A
PAGE: 03.8

Rph Cap: 0022.5A
PAGE: 03.9

Yph Cap: 0022.5A
PAGE: 03.10

Bph Cap: 0022.5A

Per Phase RMS: Submenu:
R-Y Vol: Measured AC Voltage RMS value across R and Y phase.
Y-B Vol: Measured AC Voltage RMS value across Y and B phase.
B-R Vol: Measured AC Voltage RMS value across B and R phase.
Rph Cur: Line current RMS value in R phase. Mains source.
Yph Cur: Line current RMS value in Y phase. Mains source.
Bph Cur: Line current RMS value in B phase. Mains source.
Neutral: Neutral current RMS value.
Rph Cap: Capacitor current RMS value in R phase.
Yph Cap: Capacitor current RMS value in Y phase.
Bph Cap: Capacitor current RMS value in B phase.

- 13 -

PAGE: 04

3.Power
PRESS
PAGE: 04.1

Rph PF:

PAGE: 04.10

1.00

Rph KVA: 0109.7

PAGE: 04.2

Yph PF:

PAGE: 04.11

1.00

Yph KVA: 0109.7

PAGE: 04.3

Bph PF:

PAGE: 04.12

1.00

Bph KVA: 0109.7

PAGE: 04.4

Rph KW:

PAGE: 04.13

0100.2

RphCKVAR: 010.76

PAGE: 04.5

Yph KW:

PAGE: 04.14

0100.2

YphCKVAR: 010.76

PAGE: 04.6

Bph KW:

PAGE: 04.15

0100.2

BphCKVAR: 010.76

PAGE: 04.7

PAGE: 04.16

RphKVAR: 0020.4

Rph mF

PAGE: 04.8

: 165.06

PAGE: 04.17

YphKVAR: 0020.4

Yph mF

PAGE: 04.9

: 165.06

PAGE: 04.18

BphKVAR: 0020.4

Bph mF

: 165.06

Power: Submenu:
Rph PF: Power Factor of R phase on mains source.
Yph PF: Power Factor of Y phase on mains source.
Bph PF: Power Factor of B phase on mains source.
Rph kW: Active Power in kW in R-phase.
Yph kW: Active Power in kW in Y-phase.
Bph kW: Active Power in kW in B-phase.
RphkVAR: Reactive Power in kVAr in R-phase.
YphkVAR: Reactive Power in kVAr in Y-phase.
BphkVAR: Reactive Power in kVAr in B-phase.
Rph KVA: Apparent Power in kVA in R-phase.
Yph KVA: Apparent Power in kVA in Y-phase.
Bph KVA: Apparent Power in kVA in B-phase.
RphCKVAR: Capacitor injected reactive power in R-phase.
YphCKVAR: Capacitor injected reactive power in Y-phase.
BphCKVAR: Capacitor injected reactive power in B-phase.
Rph mF: Capacitor value in micro-farad in R-phase.
Yph mF: Capacitor value in micro-farad in Y-phase.
Bph mF: Capacitor value in micro-farad in B-phase.
- 14 -

PAGE: 05

4.Energy
PRESS
PAGE: 05.1

KWH:

1234567.8

PAGE: 05.2

IndKVARH:12345.6
PAGE: 05.3

CapKVARH:12345.6
PAGE: 05.4

KVAH:

1234567.8

PAGE: 05.5

CKVARH:1234567.8

Energy: Submenu:
KWH: Overall cumulative active energy in kWh on Mains supply.
IndKVARH: Inductive reactive energy in kVArh on Mains supply.
CapKVARH: Capacitive reactive energy in kVArh on Mains supply.
KVAH: Overall cumulative apparent energy in kVA on Mains supply.
CKVARH: Capacitor compensated reactive energy in kVArh.

- 15 -

PAGE: 06

5.Harmonics
PRESS
PAGE: 06.1

Vr-THD-F: 002.4%
PAGE: 06.2

Vy-THD-F: 002.4%
PAGE: 06.3

Vb-THD-F: 002.4%
PAGE: 06.4

Ir-THD-F: 012.5%
PAGE: 06.5

Iy-THD-F: 012.5%
PAGE: 06.6

Ib-THD-F: 012.5%
PAGE: 06.7

In-THD-F: 005.0%
PAGE: 06.8

CCr-THD-F:028.2%
PAGE: 06.9

CCy-THD-F:028.2%
PAGE: 06.10

CCb-THD-F:028.2%

Harmonics: Submenu:
Vr-THD-F/R: R-Y line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Vy-THD-F/R: Y-B line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Vb-THD-F/R: B-R line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Ir-THD-F/R: R phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Iy-THD-F/R: Y phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Ib-THD-F/R: B phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
In-THD-F/R: Neutral current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
CCr-THD-F/R: R phase Capacitor current % Total Harmonic Distortion.
CCy-THD-F/R: Y phase Capacitor current % Total Harmonic Distortion.
CCb-THD-F/R: B phase Capacitor current % Total Harmonic Distortion.

- 16 -

PAGE: 07

6.Step KVAR
PRESS
PAGE: 07.1

Stp1 KVAR:0009.0
PAGE: 07.2

Stp2 KVAR:0009.0
PAGE: 07.3

Stp3 KVAR:0009.0
PAGE: 07.4

Stp4 KVAR:0009.0
PAGE: 07.5

Stp5 KVAR:0009.0
PAGE: 07.6

Stp6 KVAR:0009.0

Step KVAR: Submenu:
Stp1 KVAR: Step 1 kVAr value normalized at Capacitor rated voltage.
Stp2 KVAR: Step 2 kVAr value normalized at Capacitor rated voltage.
Stp3 KVAR: Step 3 kVAr value normalized at Capacitor rated voltage.
Stp4 KVAR: Step 4 kVAr value normalized at Capacitor rated voltage.
Stp5 KVAR: Step 5 kVAr value normalized at Capacitor rated voltage.
Stp6 KVAR: Step 6 kVAr value normalized at Capacitor rated voltage.

- 17 -

PAGE: 08

Time: 10:10:00
Real Time Clock: RTC time set in the SPF-25 is displayed here. Its in
HH:MM:SS format.

PAGE: 09

Date: 07:11:06
Real Time Clock: RTC date set in the SPF-25 is displayed here. Its in
dd:mm:yy format.

PAGE: 10

SPF-25 1.0.6

SPF-25 internal firmware version number is displayed here. (Just for user
information)

Total number of Main display pages are 11nos ranging from “00” to
“10”.

- 18 -

Method for Keyboard/Display usage.

Flow chart for entering into different modes:

PRESS
Enable

Default
Display
mode

If Password
Option is
Enable/Disable.

Disable

Enter Pwd: ****
PRESS
Enter the 4
Digit password
By use of
L, R, UP & DN
Keys.

PRESS

NO

IF
PASSWORD
Correct?

*

YES
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

1.Edit Mode

2.Auto Mode

3.Manual Mode

- 19 -

Parameter Editing Submenu Level 1:

*
1.General
2.System
3.Fault
4.Step
5.Communication

Sub-menu
Level 1
for
Parameter
Editing.

Parameter Editing
Sub-Menu
LEVEL 2

1.General and IO: Parameters related with general function and Input/Output
2. System: Electrical system (Mains supply) related parameters.

3. Fault: Setting Faults and fault levels.
4. Step: Capacitor Steps related parameters.
5. Communication: Parameters related with communication and data logging.

- 20 -

Parameter Editing Method:
(For Submenu Level 2 : L2)

Sub-Menu Level 1.
Cursor Blinking
at Parameter Values.

1.Submenu L2: ****

1.Submenu L2: ****
PRESS

key to increment value.

PRESS

Key to decrement value.

PRESS

Key to shift cursor Left.

PRESS

Key to shift cursor Right.
2.Submenu L2: ****

2.Submenu L2: ****
PRESS

key to increment value.

PRESS

Key to decrement value.

PRESS

Key to shift cursor Left.

PRESS

Key to shift cursor Right.

3.Submenu L2: ****

Exit: No Save

Exit: No Save

Without saving

Default
Display.

With saving

Screen for 1second

Saving In EEProm

Exit: With Save

- 21 -

Parameter Editing Submenu Level 2:
Menu
General

Parameter
Pwd
Ch-Pwd
Ld Def
THD
Rst. Energy

Meaning of Parameter
Password Control
Password value
Load all factory default parameters.
Type of THD factor to be displayed
Energy Counters reset to zero option

Default
Enable
1111
No
F-THD
No

Menu
System

Parameter
Meas. Vol.
Ld. Cur. Pr.
Cap. Cur. Pr.
PF Target
PF Target
Auto Sync
Async Tol.
Reset Async

Meaning of Parameter
Default
SPF-25 rated measurement voltage
440
Primary current value of mains CT
0180
0075
Primary current value of capacitor CT
Target PF for deciding Lag or Lead
Lag
1.00
Target PF exact value
Automatic synchronisation requirement Yes
% load variation tolerence for Auto-sync. 30
No
Reset Auto-sync to default value.

Menu
Fault

Parameter
Over Vol.
Over Vol. Lim
Over Vol. Clr
Under Vol.
Under Vol. Lim
Under Vol. Clr
Over Load
Over Ld. Lim
Over Ld. Clr
Under Ld.
Under Ld. Lim
Under Ld. Clr
Ld. Unbalance
Ld. Unb. Lim
Over CC
Over CC. Lim
Over CC. Clr
Over CC. Rst.
Over CC. Rst.
Under CC.
Under CC. Lim
Under CC. CLr
CC THD
CC THD Lim
CC THD Clr
Step Check
Cap. Cur Tol
Under Comp.
RTC Bat

Meaning of Parameter
Default
Over Voltage Fault: action by PDE-30 Off Step
Over Voltage activation limit value
1.10
Over Voltage resumption limit value 1.05
Under Voltage Fault: Action?
Off Step
Under Voltage activation limit value 0.70
Under Voltage resumption limit value 0.75
Over Load Fault: Action?
Indicate
Mains current over load limit value
1.30
Mains cur. over load resume value
1.25
Under Load on Mains: Action?
Indicate
Under load Activation limit value
0.03
Under load Resumption limit value
0.05
Load Un-balance Fault: Action?
Off Step
Load Un-balance limit
025%
Capacitor Over Current Fault: Action? Disable
Cap. Over Current Limit value.
1.30
Cap. Over Current Resume value.
1.25
Auto reset feature on Cap. Over Cur. No
If Over CC. Rst.=Yes. Time for reset. 120 sec
Under Capacitor current fault: Action? Disable
Under Cap. Cur. Limit value.
0.95
Under Cap. Cur. Resume value.
0.97
Capacitor current Over THD: Action? Disable
Cap.Cur. Over THD limit value.
0.10
Cap.Cur. Over THD resume value.
0.08
Every step kVAr healthiness monitor. Disable
Step kVAr healthiness: tolerence.
0.10
Out of Banks Indication.
Disable
RTC Battery fault monitoring.
Enable

- 22 -

Min
Disable
0000
No
R-THD
No
Min
Non
0001
0001
Lead
0.70Lag
No
01
No

Min

Max
Enable
9999
Yes
F-THD
Yes
Max
Edible
9999
9999
Lag
0.85Lead
Yes
50
Yes

Max

Disable, Indicative, Off Step

0.90
0.85

1.20
1.15

Disable, Indicative, Off Step

0.70
0.75

0.95
1.00

Disable, Indicative, Off Step

1.10
1.05

1.30
1.25

Disable, Indicative, Off Step

0.01
0.02

0.20
0.25

Disable, Indicative, Off Step

005%

100%

Disable, Indicative, Off Step

1.05
1.00
No
15

1.50
1.45
Yes
900

Disable, Indicative, Off Step

0.75
0.80

0.98
1.00

Disable, Indicative, Off Step

0.02
0.01
Disable
0.03
Disable
Disable

0.99
0.90
Enable
0.50
Enable
Enable

Menu
Step

Parameter
No. of Steps
Step Vol
Corr. Time
Discharge Time
Step 1 KVAR
Step 2 KVAR
Step 3 KVAR
Step 4 KVAR
Step 5 KVAR
Step 6 KVAR

Meaning of Parameter
Number of Capacitor steps utilised
Voltage at which kVAr is defined
Correction cycle time.
Capacitor discharge time.
Step 1 kVAr value.
Step 2 kVAr value.
Step 3 kVAr value.
Step 4 kVAr value.
Step 5 kVAr value.
Step 6 kVAr value.

Menu
Parameter
Meaning of Parameter
Communication Unit ID
Communication ID of the unit
Baud Rate
Serial communication baud rate.
Time
RTC time to be set
Date
RTC date to be set
Init RTC
Initialise RTC?
Clear NVRAM Clear all contents on NV RAM?

Default
3
440
120 secs
120 secs
006
009
018
018
018
018

Min
1
380
010
010
001
001
001
001
001
001

Default
3001
09600
--No
No

Min
0000
04800
--No
No

Max
6
660
240
240
250
250
250
250
250
250

Max
9999
38400
--Yes
Yes

Note that all the parameters in the Sub-Menu Level 2 should be carefully filled in the
SPF-25. Failing to put the correct parameters can make SPF-25 to malfunction.
Its therefore advised that a trained person should only be allowed to change these
values.

- 23 -

Commissioning Instructions :
before panel is powered up for the first time.
1. Panel Wiring Check
Ensure that all connections in the panel is tightened properly and there are no
loose connections. Also ensure that the wiring is done as per the wiring
diagram.
2. Power Wiring Check
Ensure that the power cables are connected properly from the Panel I/C to the
feeder I/C or the transformer bushings. The connection has to be after the
Load Feed back CT looking from the Transformer side.
Ensure that the Bus Bars and/or Lugs are clean and free of Dust, Corrosion or
Oxidation on the contact sides so that good electrical connection is maintained.
The surface area should be flat so as to get maximum contact area.
If required Clean the Bus Bars and/ or Lugs by rubbing it with Polish Paper to
remove the oxidation layer. Provide contact paste in between the contacts
surfaces.
Not performing this, can result in to a weaker source point for Capacitor
charging during Step on and this can generate undesirable Noise which can
hamper the performance of equipments installed in the capacitor panel.
3. Load Feed Back CT connection.
Ensure that the load feed back CT connections are done properly. Confirm that
correct phase CT is connected with the correct phase input terminals. (Even
though auto sync is capable of taking care of wrong CT polarities or CT
position interchanging, but then on display, the Phase readings may be seen to
be interchanged. (May be R-phase reading would be seen in B-phase and
vice-versa.
CT connections to be done carefully so as to ensure that the wire does not get
open and there is no loose connection.

Loose connection’s or open CT secondary can result in to very high voltages
getting developed in the circuit which can damage the CT and also produce
high levels of noise in the system.

- 24 -

Fault Finding Guidelines :

Fault Type

Probable Reason

Action to Take

Unit Does not
turn ON. No
display on LCD.

•Input auxiliary supply
not coming.
•Input side fuses
blown

•Check the input
supply to restore
•Check fuses in the
unit for OK.

Unit does not
turn On any
capacitors even
if PF is below
Lower PF limit.

•If auto-sync failure
message is there at
Power On.

• Load may be highly
fluctuating so need of
manual
synchronisation only.
• This is OK
condition.

• The load KW is too
low with Under load
fault enable condition.
•Control connections
from SPF-25 to
contactor coils are not
proper

•Check control supply
and connections from
SPF-25 to contactors.

BF indication on
Default display.

• Internal Ni-Cd
3.2Vdc battery used
for RTC and NV RAM
must be drained down.

• Replace this battery
in consultancy with
TAS trained
personnel.

Some Capacitor
banks are
declared as
faulty even if
they are
checked to be
OK.

•Individual step health
monitoring is enabled
and tolerance limits
set are too stringent.
• Capacitor current
THD factor is
continuously
fluctuating.

•Set the tolerance
limits for individual
steps monitoring as
relaxed.
• With continuously
fluctuating THD of
Capacitor current and
higher level of THD
can cause some
errors in individual
step KVAR
measurement. Under
this condition, best is
to keep this feature
disabled.

- 25 -

Fault Finding Guidelines (continued):

Fault Type

Probable Reason

Action to Take

Serial
Communication
is not working.

• Baud rate selection
is not proper.
• Unit ID is not set
properly.
• Serial
communication cable
connections are not
proper.

• Select proper baud
rate.
• Set the unit ID
correctly.
• Check the serial
cable continuity as
per the connections
given earlier in this
manual.

Data logging is
not taking place.

• Possible that RTC
date is not set
properly.

• Change the battery
by help of TAS’s
authorised person.

SPF-25 resets
occasionally on
turning OFF of
any contactor.

• The contactor supply
phase may be the
same as used for SPF25 auxiliary supply.
• RC snubbers/ free
wheeling diodes are
not put with contactor
coils.

• Use the different
phase for control
supply of contactors
and for SPF-25 supply
• Usage of RC
snubbers / free
wheeling diodes is
mandatory.

- 26 -

Corporate Office/Works/Design Centre:
W-61, MIDC, Ambad, Nasik - 422010, Maharashtra (India)
Tel: +91-(253)-2384038 / 2381090
Email: [email protected]
Marketing and After-Sales Service:
A/58, Kamal Pushpa, K.C. Road, Bandra, Mumbai-400050.
Tel: +91-9930513923
Email: [email protected]
Regional Office: Delhi
191-B, Ground Floor, Padam Nagar (Filter Market),
New Delhi - 110007 (India).
Tel: +91-9911615701
Email: [email protected]


Slide 24

Operations Manual
SPF-25/6
AUTOMATIC POWER FACTOR
CONTROLLER

TAS Powertek Pvt. Ltd.
Corporate Office:
W-61, MIDC, Ambad, Nasik - 422010, Maharashtra (India)
Tel: +91-(253)-2384038 / 2381090
Email: [email protected]

NOTE
These instructions do not purport to cover all details or
variations in equipment, nor to provide for every possible
contingency to be met in connection with installation,
operation or maintenance.

Should further information be desired or should particular
problems arise which are not covered sufficiently for the
purchasers purposes, the matter should be referred to our
TAS Powertek Pvt. Ltd., office.
The contents of this instruction Manual shall not become
part of or modify any prior or existing agreement or
relationship. The sales contract contains the entire
obligations of TAS Powertek Pvt. Ltd. The warranty
contained in the contract between the parties is the sole
warranty of TAS Powertek Pvt. Ltd. Any statements
contained herein do not create new warranties or modify the
existing warranty.

The reproduction, transmission or use of this
document or its contents is not permitted
without express written authority. Offenders
will be liable for damages. All rights are
reserved.

Index
Index Page
-----------------Features & Specifications
----------Mechanical Dimensions/ mounting --------Functional Block diagram
-----------------PF correction technique
-----------------Back Side terminals
-----------------------Typical wiring scheme ---------------------Front Facia
---------------------------------Communication connector connections ----Display of various parameters / Status ---Method of Keyboard/Display usage -------Parameter Submenu -----------------------Commissioning Instruction (before Powerup)
Fault finding Guidelines ---------------------

-1-

1
2
3
4
5
6
7
8
9
10
19
22
24
25

Features:
• Totally Micro-processor controlled Digital Signal processing
logic for measurements.
• All measurements with 1.0 class accuracy.
• Automatic Synchronisation capable of giving the correct
results for wrong connections at CT terminals (even wrong
polarity of CTs).
• Measurement and kVAr compensation are frequency / THD
compensated.
• Load V,Iph, In and Cap. current THD measurement.
• Up-to 6 output banks control.
• Capable of doing the kVAr measurements on basis of mean
of the correction cycle time and provide kVAr compensation.
• Standard 144 X 144 cabinet for panel door flush mounting.
• Serial communication through standard TAS protocols.
• Manual testing mode for user checking of the Capacitor steps
switching.
• Protections provided (user settable):
Over/under Voltage
Cap. Over/under current / THD.
Over/Under frequency (internally set limits)
Over / Under load.
Load unbalance.
Capacitor individual step kVAr monitoring.
Out of steps: Under-compensation (only for indication)
NV-RAM battery down.
• Data logging for various parameters for 2months period at an
interval of 1hr.
• Unit comes along with PC (Windows compatible) software
for downloading and viewing the logged data.

Specifications:
•
•
•
•
•
•
•
•
•
•
•
•

Feed-back Voltage:440Volt (+10%/-30%)
Current input : 1Amp for load and capacitor feed-back.
Measurement Accuracy: Class 1.0
Auxiliary Supply: 525Vac to 300Vac.
Correction / Discharge time:
Selectable in seconds from 10sec. to 240sec.
Output commands:
NO contacts each with current rating of 0.5Amp AC. at
240Vac.
RS-232 baud rate selectable from 4.8kBPS to 38.4kBPS.
Operating temperature: 0 to 55oC.
1.0class measurement Operating temperature: 0 to 50oC.
Storage temperature: -10 to +75oC.
Humidity: 0 to 98%.
Supply frequency: 45Hz to 55Hz.

-2-

Mechanical Dimensions:
135

144

135

120
144

6

Recommended size for cutout on panel door is 138 X 138.
All Dimensions given are in mm.

Maximum weight: (with clamps and terminals) = 2.5kg.

-3-

Functional Block Diagram:
3 channel
Current f.b.

3
Channel
Cap.
Current
f.b.

3 channel
Voltage f.b.

SPF-25

V, I, PF and Power
Measurement
Block
For every AC mains
Cycle.

Calculation
Block for
• Energy Parameters
• Harmonic analysis

EEPROM
For Data
Logging

Keyboard,
Display and
Other support
Functions
Block.

RS-232 Serial
Communication.
TAS-01
Protocol stack.

Power Factor
Correction Block
+ event monitoring.

Outputs Commands
For Capacitor
Switching.

Power Supply
Block.

Above block diagram gives the functional blocks that are built into SPF-25 PF
correction relay.
These blocks are made up with the combination of functions from hardware and
corresponding firmware that resides in the Program memory of the micro-processor
used therein.
Even though the basic blocks exists as shown in the diagram, there functionality is
interdependent. The entire combination is carefully designed so as to have
minimum effects of Electrical and Electromagnetic noise level on the functionality of
this SPF-25.
The firmware written takes into various error handling eventualities so that the
functioning of this PF relay is error free and highly reliable.

-4-

PF correction technique:
KVAr Inductive

Target
PF.
Cos Φ
= PF

1.5 X kVAr
Of Smallest
Capacitor bank

KW

No change band.
KVAr Capacitive
Capacitor Addition band.
Capacitor Removal band.
SPF-25 for kVAr compensation works with the kW v/s kVAr diagram as shown here
above.
A band is created across the target PF value. (Target PF is set by user). This band
is of +0.75 of the smallest capacitor bank kVAr. Thus, total band width is always 1.5
times the smallest capacitor bank kVAr used. This is a no change band. If the
mains source parameters are within this band, SPF-25 would not change the
capacitors bank status.
If the mains parameters are out of this “No change band”, then SPF-25 calculates
the correct capacitor bank combination to be added / subtracted and within one
correction cycle brings it within the No change band.
The no change band width is selected as mentioned because it has to prevent unnecessary hunting (switching on/off) of the capacitor banks.

-5-

Back Side terminals:

Voltage
Feed-Back

Auxiliary
Supply

Current
Feed-Back
Output commands.

-6-

Capacitor
Current
Feed-Back

Typical Wiring with SPF-25 PF correction system.
L
O
A
D

L
C
R
+

L
C
R
-

L
C
Y
+

L
C
Y
-

L
C
B
+

L
C
B
-

PH 3
PH 2
PH 1
CCR+
CCRCCY+
CCYCCB+
CCB-

S
P
F
2
5

Auxiliary
Supply

L1
L2

Com
C01
C02
|

C06

Mains Connections:
Phase 1 control:
Neutral control:
Commands:
Load Current CT:
Capacitor Current CT:

-7-

Front Facia of SPF-25:
LCD Display

Step status LED indication
Serial Communication Port

Membrane Keypad

Usage of the UP and DN key makes the LCD display to scroll up
and down. This is used for display of various status as well as for
viewing the On line measured electrical values.
These keys are also used for changing values in Parameters
Editing mode and used for status changing of banks in Manual
mode.
Usage of ENT key is for entering the submenu and / or for setting
up some values.
The L and R keys are used in changing the position of the cursor
from Left to Right and vice-versa.

-8-

RS-232 serial communication 9 pin D connector:

5

4

6

3

7

2

8

1

9
RXD

GND

TXD

RS-232 cable connection Details:

PIN
NO

PC side
Connection

CONNECTION

SPF-25

1

NC

2

RXD

TXD

3

TXD

RXD

GND

GND

4
5
6
7
8
9

NC

-9-

Display of Various Parameters / Status:
PAGE: 00

COSΦ= -0.99 A OK

This is default display screen giving
information on PF, mode and
working status.

COSΦ= -0.99 :This part of the display indicates the Power Factor running value. The
sign –ve indicates that PF is Capacitive and no sign (+ve) indicates that PF is Inductive.
The PF indicated is the overall PF of the three phase system.
A or M :
This part either indicates the letter “A” or letter “M”. The letter A means
that SPF-25 is working in Auto mode.
The letter M means that SPF-25 is presently in Manual mode.
The Auto or Manual modes can be selected by pressing ENT key on this page.
(If Password option is enabled, enter the same by using UP/DN/L/R keys and then
Pressing ENT)
Then by UP or DN key you can stroll between the displays:
“1. Edit Mode”, “2. Auto Mode”, “3.Manual Mode”.
The first one “1.Edit Mode” is for parameter changing. The details of parameter changing
are explained in detail in later part of this manual.
The second and third one as display indicates are for selecting Auto or Manual mode
respectively. The ENT key pressed on selecting the mode desired, puts the SPF-25 into
that mode.
Auto Mode: In this mode SPF-25 works in automatic mode. It switches the capacitor
banks automatically depending on the parameter setting of target PF. This mode is the
default mode and is to be used for unmanned operation of the system controlled by
SPF-25.
Manual Mode: This mode is activated for checking/testing the capacitor banks switching.
Its also used for changing the Masking status of the capacitor banks. More on this is
explained later. (On Page 01 explanation)
OK or ** :
The last part of the display that is blinking every 500mS indicates the
working status of SPF-25. “OK” indicates that unit is working fine without any trip
conditions. If there is other indication, the meaning of the same can be as:
OK
:
No Fault
OC
:
Over Capacitor Current
UC
:
Under Capacitor Current
OL
:
Over Load
UL
:
Under Load
OV
:
Over Voltage
UV
:
Under Voltage
OF
:
Over Frequency
UF
:
Under Frequency
OH
:
Over Capacitor Current THD %.
OB
:
Out of Banks
LU
:
Load Unbalance
BF
:
Battery Failure (RTC)
NV
:
NVRAM Checksum Error
VA
:
Voltage Absent
- 10 -

PAGE: 01

PAGE: 01

______

AUTO

______

MAN

This display indicates the Bank status in Auto mode and in Manual mode it helps
to make the specific bank On or Off or declare masked.
: Means Bank is On.
: Means Bank is Off.
: Means Bank is Off and is declared masked (out of action)
: Means Bank does not exist for compensation.
When the Page 01 is in Auto mode, its only for indication of Bank status.
But in Manual mode, the “ENT” key press activates the manual control
mode. The cursor over the bank number starts blinking. The UP and DN
keys can turn On and Off the respective bank.
The DN key pressed puts the respective bank in Masking mode and another
press of DN key brings it out of Masking mode.

Putting the bank masking status permanently:
If a bank is to be permanently put in masked mode or is to be brought out of
permanent masked mode, it can be done by bringing the blinking cursor on
the position of the respective bank by use of L or R key. Then by pressing
DN key, bring the status of the bank to the required level (Masked or
Unmasked). Then press ENT key so that cursor stops blinking. After that by
pressing UP key go to Page 00. Then Press ENT. (If Password option is
enabled, enter the same by using UP/DN/L/R keys and then Press ENT)
“1.EDIT MODE” would be displayed. Press ENT one more time. “1.General
and IO” would be displayed. Press ENT again. “Pwd : Disable” or “Pwd :
Enable” would be displayed. Press UP key. “Exit: No Save” would be
displayed. Press ENT so that cursor will start blinking. Press UP. “Exit: With
Save” would be displayed with cursor blinking. Press ENT. “Saving in
EEPROM” would be displayed for a short time and then Page 00 would be
displayed.
You will observe that the bank status as requirement is changed
permanently to the status desired.

- 11 -

PAGE: 02

1.Overall Values
PRESS
PAGE: 02.1

Avg Vol: 415.7 V
PAGE: 02.2

Avg Cur: 0123.4A
PAGE: 02.3

Tot KW:

0081.2

PAGE: 02.4

TotKVAR: 0024.6
PAGE: 02.5

Tot KVA: 0101.1
PAGE: 02.6

Avg CC:

0031.3A

PAGE: 02.7

CKVAR:

028.35

PAGE: 02.8

LS PF:

0.82

PAGE: 02.9

LS KVAR: 0043.9
PAGE: 02.10

LS KVA:

0125.7

PAGE: 02.11

Freq:

49.9Hz

The Overall values Display menu has submenus as displayed above. As its
self explanatory it means:
Avg Vol: Average voltage of all the three line to line voltage values.
Avg Cur: Average current of all the three phase line current values.
Tot KW: Overall kW of the three phase system measured at source.
TotKVAR: Overall kVAr of the three phase system measured at source.
Tot KVA: Overall kVA of the three phase system measured at source.
Avg CC: Average of three phase current through capacitor panel.
CKVAR: Capacitive kVAr that is compensated by the system.
LS PF: Load side PF. (PF value if not compensated.
LS KVAR: Load side kVAr.
LS KVA: Load side kVA.
Freq: Supply frequency in Hz.
- 12 -

PAGE: 03

2.Per-Phase RMS

PRESS
PAGE: 03.1

R-Y Vol: 415.7 V
PAGE: 03.2

Y-B Vol: 415.7 V
PAGE: 03.3

B-R Vol: 415.7 V
PAGE: 03.4

Rph Cur: 0110.8A
PAGE: 03.5

Yph Cur: 0110.8A
PAGE: 03.6

Bph Cur: 0110.8A
PAGE: 03.7

Neutral: 0010.2A
PAGE: 03.8

Rph Cap: 0022.5A
PAGE: 03.9

Yph Cap: 0022.5A
PAGE: 03.10

Bph Cap: 0022.5A

Per Phase RMS: Submenu:
R-Y Vol: Measured AC Voltage RMS value across R and Y phase.
Y-B Vol: Measured AC Voltage RMS value across Y and B phase.
B-R Vol: Measured AC Voltage RMS value across B and R phase.
Rph Cur: Line current RMS value in R phase. Mains source.
Yph Cur: Line current RMS value in Y phase. Mains source.
Bph Cur: Line current RMS value in B phase. Mains source.
Neutral: Neutral current RMS value.
Rph Cap: Capacitor current RMS value in R phase.
Yph Cap: Capacitor current RMS value in Y phase.
Bph Cap: Capacitor current RMS value in B phase.

- 13 -

PAGE: 04

3.Power
PRESS
PAGE: 04.1

Rph PF:

PAGE: 04.10

1.00

Rph KVA: 0109.7

PAGE: 04.2

Yph PF:

PAGE: 04.11

1.00

Yph KVA: 0109.7

PAGE: 04.3

Bph PF:

PAGE: 04.12

1.00

Bph KVA: 0109.7

PAGE: 04.4

Rph KW:

PAGE: 04.13

0100.2

RphCKVAR: 010.76

PAGE: 04.5

Yph KW:

PAGE: 04.14

0100.2

YphCKVAR: 010.76

PAGE: 04.6

Bph KW:

PAGE: 04.15

0100.2

BphCKVAR: 010.76

PAGE: 04.7

PAGE: 04.16

RphKVAR: 0020.4

Rph mF

PAGE: 04.8

: 165.06

PAGE: 04.17

YphKVAR: 0020.4

Yph mF

PAGE: 04.9

: 165.06

PAGE: 04.18

BphKVAR: 0020.4

Bph mF

: 165.06

Power: Submenu:
Rph PF: Power Factor of R phase on mains source.
Yph PF: Power Factor of Y phase on mains source.
Bph PF: Power Factor of B phase on mains source.
Rph kW: Active Power in kW in R-phase.
Yph kW: Active Power in kW in Y-phase.
Bph kW: Active Power in kW in B-phase.
RphkVAR: Reactive Power in kVAr in R-phase.
YphkVAR: Reactive Power in kVAr in Y-phase.
BphkVAR: Reactive Power in kVAr in B-phase.
Rph KVA: Apparent Power in kVA in R-phase.
Yph KVA: Apparent Power in kVA in Y-phase.
Bph KVA: Apparent Power in kVA in B-phase.
RphCKVAR: Capacitor injected reactive power in R-phase.
YphCKVAR: Capacitor injected reactive power in Y-phase.
BphCKVAR: Capacitor injected reactive power in B-phase.
Rph mF: Capacitor value in micro-farad in R-phase.
Yph mF: Capacitor value in micro-farad in Y-phase.
Bph mF: Capacitor value in micro-farad in B-phase.
- 14 -

PAGE: 05

4.Energy
PRESS
PAGE: 05.1

KWH:

1234567.8

PAGE: 05.2

IndKVARH:12345.6
PAGE: 05.3

CapKVARH:12345.6
PAGE: 05.4

KVAH:

1234567.8

PAGE: 05.5

CKVARH:1234567.8

Energy: Submenu:
KWH: Overall cumulative active energy in kWh on Mains supply.
IndKVARH: Inductive reactive energy in kVArh on Mains supply.
CapKVARH: Capacitive reactive energy in kVArh on Mains supply.
KVAH: Overall cumulative apparent energy in kVA on Mains supply.
CKVARH: Capacitor compensated reactive energy in kVArh.

- 15 -

PAGE: 06

5.Harmonics
PRESS
PAGE: 06.1

Vr-THD-F: 002.4%
PAGE: 06.2

Vy-THD-F: 002.4%
PAGE: 06.3

Vb-THD-F: 002.4%
PAGE: 06.4

Ir-THD-F: 012.5%
PAGE: 06.5

Iy-THD-F: 012.5%
PAGE: 06.6

Ib-THD-F: 012.5%
PAGE: 06.7

In-THD-F: 005.0%
PAGE: 06.8

CCr-THD-F:028.2%
PAGE: 06.9

CCy-THD-F:028.2%
PAGE: 06.10

CCb-THD-F:028.2%

Harmonics: Submenu:
Vr-THD-F/R: R-Y line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Vy-THD-F/R: Y-B line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Vb-THD-F/R: B-R line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Ir-THD-F/R: R phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Iy-THD-F/R: Y phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Ib-THD-F/R: B phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
In-THD-F/R: Neutral current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
CCr-THD-F/R: R phase Capacitor current % Total Harmonic Distortion.
CCy-THD-F/R: Y phase Capacitor current % Total Harmonic Distortion.
CCb-THD-F/R: B phase Capacitor current % Total Harmonic Distortion.

- 16 -

PAGE: 07

6.Step KVAR
PRESS
PAGE: 07.1

Stp1 KVAR:0009.0
PAGE: 07.2

Stp2 KVAR:0009.0
PAGE: 07.3

Stp3 KVAR:0009.0
PAGE: 07.4

Stp4 KVAR:0009.0
PAGE: 07.5

Stp5 KVAR:0009.0
PAGE: 07.6

Stp6 KVAR:0009.0

Step KVAR: Submenu:
Stp1 KVAR: Step 1 kVAr value normalized at Capacitor rated voltage.
Stp2 KVAR: Step 2 kVAr value normalized at Capacitor rated voltage.
Stp3 KVAR: Step 3 kVAr value normalized at Capacitor rated voltage.
Stp4 KVAR: Step 4 kVAr value normalized at Capacitor rated voltage.
Stp5 KVAR: Step 5 kVAr value normalized at Capacitor rated voltage.
Stp6 KVAR: Step 6 kVAr value normalized at Capacitor rated voltage.

- 17 -

PAGE: 08

Time: 10:10:00
Real Time Clock: RTC time set in the SPF-25 is displayed here. Its in
HH:MM:SS format.

PAGE: 09

Date: 07:11:06
Real Time Clock: RTC date set in the SPF-25 is displayed here. Its in
dd:mm:yy format.

PAGE: 10

SPF-25 1.0.6

SPF-25 internal firmware version number is displayed here. (Just for user
information)

Total number of Main display pages are 11nos ranging from “00” to
“10”.

- 18 -

Method for Keyboard/Display usage.

Flow chart for entering into different modes:

PRESS
Enable

Default
Display
mode

If Password
Option is
Enable/Disable.

Disable

Enter Pwd: ****
PRESS
Enter the 4
Digit password
By use of
L, R, UP & DN
Keys.

PRESS

NO

IF
PASSWORD
Correct?

*

YES
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

1.Edit Mode

2.Auto Mode

3.Manual Mode

- 19 -

Parameter Editing Submenu Level 1:

*
1.General
2.System
3.Fault
4.Step
5.Communication

Sub-menu
Level 1
for
Parameter
Editing.

Parameter Editing
Sub-Menu
LEVEL 2

1.General and IO: Parameters related with general function and Input/Output
2. System: Electrical system (Mains supply) related parameters.

3. Fault: Setting Faults and fault levels.
4. Step: Capacitor Steps related parameters.
5. Communication: Parameters related with communication and data logging.

- 20 -

Parameter Editing Method:
(For Submenu Level 2 : L2)

Sub-Menu Level 1.
Cursor Blinking
at Parameter Values.

1.Submenu L2: ****

1.Submenu L2: ****
PRESS

key to increment value.

PRESS

Key to decrement value.

PRESS

Key to shift cursor Left.

PRESS

Key to shift cursor Right.
2.Submenu L2: ****

2.Submenu L2: ****
PRESS

key to increment value.

PRESS

Key to decrement value.

PRESS

Key to shift cursor Left.

PRESS

Key to shift cursor Right.

3.Submenu L2: ****

Exit: No Save

Exit: No Save

Without saving

Default
Display.

With saving

Screen for 1second

Saving In EEProm

Exit: With Save

- 21 -

Parameter Editing Submenu Level 2:
Menu
General

Parameter
Pwd
Ch-Pwd
Ld Def
THD
Rst. Energy

Meaning of Parameter
Password Control
Password value
Load all factory default parameters.
Type of THD factor to be displayed
Energy Counters reset to zero option

Default
Enable
1111
No
F-THD
No

Menu
System

Parameter
Meas. Vol.
Ld. Cur. Pr.
Cap. Cur. Pr.
PF Target
PF Target
Auto Sync
Async Tol.
Reset Async

Meaning of Parameter
Default
SPF-25 rated measurement voltage
440
Primary current value of mains CT
0180
0075
Primary current value of capacitor CT
Target PF for deciding Lag or Lead
Lag
1.00
Target PF exact value
Automatic synchronisation requirement Yes
% load variation tolerence for Auto-sync. 30
No
Reset Auto-sync to default value.

Menu
Fault

Parameter
Over Vol.
Over Vol. Lim
Over Vol. Clr
Under Vol.
Under Vol. Lim
Under Vol. Clr
Over Load
Over Ld. Lim
Over Ld. Clr
Under Ld.
Under Ld. Lim
Under Ld. Clr
Ld. Unbalance
Ld. Unb. Lim
Over CC
Over CC. Lim
Over CC. Clr
Over CC. Rst.
Over CC. Rst.
Under CC.
Under CC. Lim
Under CC. CLr
CC THD
CC THD Lim
CC THD Clr
Step Check
Cap. Cur Tol
Under Comp.
RTC Bat

Meaning of Parameter
Default
Over Voltage Fault: action by PDE-30 Off Step
Over Voltage activation limit value
1.10
Over Voltage resumption limit value 1.05
Under Voltage Fault: Action?
Off Step
Under Voltage activation limit value 0.70
Under Voltage resumption limit value 0.75
Over Load Fault: Action?
Indicate
Mains current over load limit value
1.30
Mains cur. over load resume value
1.25
Under Load on Mains: Action?
Indicate
Under load Activation limit value
0.03
Under load Resumption limit value
0.05
Load Un-balance Fault: Action?
Off Step
Load Un-balance limit
025%
Capacitor Over Current Fault: Action? Disable
Cap. Over Current Limit value.
1.30
Cap. Over Current Resume value.
1.25
Auto reset feature on Cap. Over Cur. No
If Over CC. Rst.=Yes. Time for reset. 120 sec
Under Capacitor current fault: Action? Disable
Under Cap. Cur. Limit value.
0.95
Under Cap. Cur. Resume value.
0.97
Capacitor current Over THD: Action? Disable
Cap.Cur. Over THD limit value.
0.10
Cap.Cur. Over THD resume value.
0.08
Every step kVAr healthiness monitor. Disable
Step kVAr healthiness: tolerence.
0.10
Out of Banks Indication.
Disable
RTC Battery fault monitoring.
Enable

- 22 -

Min
Disable
0000
No
R-THD
No
Min
Non
0001
0001
Lead
0.70Lag
No
01
No

Min

Max
Enable
9999
Yes
F-THD
Yes
Max
Edible
9999
9999
Lag
0.85Lead
Yes
50
Yes

Max

Disable, Indicative, Off Step

0.90
0.85

1.20
1.15

Disable, Indicative, Off Step

0.70
0.75

0.95
1.00

Disable, Indicative, Off Step

1.10
1.05

1.30
1.25

Disable, Indicative, Off Step

0.01
0.02

0.20
0.25

Disable, Indicative, Off Step

005%

100%

Disable, Indicative, Off Step

1.05
1.00
No
15

1.50
1.45
Yes
900

Disable, Indicative, Off Step

0.75
0.80

0.98
1.00

Disable, Indicative, Off Step

0.02
0.01
Disable
0.03
Disable
Disable

0.99
0.90
Enable
0.50
Enable
Enable

Menu
Step

Parameter
No. of Steps
Step Vol
Corr. Time
Discharge Time
Step 1 KVAR
Step 2 KVAR
Step 3 KVAR
Step 4 KVAR
Step 5 KVAR
Step 6 KVAR

Meaning of Parameter
Number of Capacitor steps utilised
Voltage at which kVAr is defined
Correction cycle time.
Capacitor discharge time.
Step 1 kVAr value.
Step 2 kVAr value.
Step 3 kVAr value.
Step 4 kVAr value.
Step 5 kVAr value.
Step 6 kVAr value.

Menu
Parameter
Meaning of Parameter
Communication Unit ID
Communication ID of the unit
Baud Rate
Serial communication baud rate.
Time
RTC time to be set
Date
RTC date to be set
Init RTC
Initialise RTC?
Clear NVRAM Clear all contents on NV RAM?

Default
3
440
120 secs
120 secs
006
009
018
018
018
018

Min
1
380
010
010
001
001
001
001
001
001

Default
3001
09600
--No
No

Min
0000
04800
--No
No

Max
6
660
240
240
250
250
250
250
250
250

Max
9999
38400
--Yes
Yes

Note that all the parameters in the Sub-Menu Level 2 should be carefully filled in the
SPF-25. Failing to put the correct parameters can make SPF-25 to malfunction.
Its therefore advised that a trained person should only be allowed to change these
values.

- 23 -

Commissioning Instructions :
before panel is powered up for the first time.
1. Panel Wiring Check
Ensure that all connections in the panel is tightened properly and there are no
loose connections. Also ensure that the wiring is done as per the wiring
diagram.
2. Power Wiring Check
Ensure that the power cables are connected properly from the Panel I/C to the
feeder I/C or the transformer bushings. The connection has to be after the
Load Feed back CT looking from the Transformer side.
Ensure that the Bus Bars and/or Lugs are clean and free of Dust, Corrosion or
Oxidation on the contact sides so that good electrical connection is maintained.
The surface area should be flat so as to get maximum contact area.
If required Clean the Bus Bars and/ or Lugs by rubbing it with Polish Paper to
remove the oxidation layer. Provide contact paste in between the contacts
surfaces.
Not performing this, can result in to a weaker source point for Capacitor
charging during Step on and this can generate undesirable Noise which can
hamper the performance of equipments installed in the capacitor panel.
3. Load Feed Back CT connection.
Ensure that the load feed back CT connections are done properly. Confirm that
correct phase CT is connected with the correct phase input terminals. (Even
though auto sync is capable of taking care of wrong CT polarities or CT
position interchanging, but then on display, the Phase readings may be seen to
be interchanged. (May be R-phase reading would be seen in B-phase and
vice-versa.
CT connections to be done carefully so as to ensure that the wire does not get
open and there is no loose connection.

Loose connection’s or open CT secondary can result in to very high voltages
getting developed in the circuit which can damage the CT and also produce
high levels of noise in the system.

- 24 -

Fault Finding Guidelines :

Fault Type

Probable Reason

Action to Take

Unit Does not
turn ON. No
display on LCD.

•Input auxiliary supply
not coming.
•Input side fuses
blown

•Check the input
supply to restore
•Check fuses in the
unit for OK.

Unit does not
turn On any
capacitors even
if PF is below
Lower PF limit.

•If auto-sync failure
message is there at
Power On.

• Load may be highly
fluctuating so need of
manual
synchronisation only.
• This is OK
condition.

• The load KW is too
low with Under load
fault enable condition.
•Control connections
from SPF-25 to
contactor coils are not
proper

•Check control supply
and connections from
SPF-25 to contactors.

BF indication on
Default display.

• Internal Ni-Cd
3.2Vdc battery used
for RTC and NV RAM
must be drained down.

• Replace this battery
in consultancy with
TAS trained
personnel.

Some Capacitor
banks are
declared as
faulty even if
they are
checked to be
OK.

•Individual step health
monitoring is enabled
and tolerance limits
set are too stringent.
• Capacitor current
THD factor is
continuously
fluctuating.

•Set the tolerance
limits for individual
steps monitoring as
relaxed.
• With continuously
fluctuating THD of
Capacitor current and
higher level of THD
can cause some
errors in individual
step KVAR
measurement. Under
this condition, best is
to keep this feature
disabled.

- 25 -

Fault Finding Guidelines (continued):

Fault Type

Probable Reason

Action to Take

Serial
Communication
is not working.

• Baud rate selection
is not proper.
• Unit ID is not set
properly.
• Serial
communication cable
connections are not
proper.

• Select proper baud
rate.
• Set the unit ID
correctly.
• Check the serial
cable continuity as
per the connections
given earlier in this
manual.

Data logging is
not taking place.

• Possible that RTC
date is not set
properly.

• Change the battery
by help of TAS’s
authorised person.

SPF-25 resets
occasionally on
turning OFF of
any contactor.

• The contactor supply
phase may be the
same as used for SPF25 auxiliary supply.
• RC snubbers/ free
wheeling diodes are
not put with contactor
coils.

• Use the different
phase for control
supply of contactors
and for SPF-25 supply
• Usage of RC
snubbers / free
wheeling diodes is
mandatory.

- 26 -

Corporate Office/Works/Design Centre:
W-61, MIDC, Ambad, Nasik - 422010, Maharashtra (India)
Tel: +91-(253)-2384038 / 2381090
Email: [email protected]
Marketing and After-Sales Service:
A/58, Kamal Pushpa, K.C. Road, Bandra, Mumbai-400050.
Tel: +91-9930513923
Email: [email protected]
Regional Office: Delhi
191-B, Ground Floor, Padam Nagar (Filter Market),
New Delhi - 110007 (India).
Tel: +91-9911615701
Email: [email protected]


Slide 25

Operations Manual
SPF-25/6
AUTOMATIC POWER FACTOR
CONTROLLER

TAS Powertek Pvt. Ltd.
Corporate Office:
W-61, MIDC, Ambad, Nasik - 422010, Maharashtra (India)
Tel: +91-(253)-2384038 / 2381090
Email: [email protected]

NOTE
These instructions do not purport to cover all details or
variations in equipment, nor to provide for every possible
contingency to be met in connection with installation,
operation or maintenance.

Should further information be desired or should particular
problems arise which are not covered sufficiently for the
purchasers purposes, the matter should be referred to our
TAS Powertek Pvt. Ltd., office.
The contents of this instruction Manual shall not become
part of or modify any prior or existing agreement or
relationship. The sales contract contains the entire
obligations of TAS Powertek Pvt. Ltd. The warranty
contained in the contract between the parties is the sole
warranty of TAS Powertek Pvt. Ltd. Any statements
contained herein do not create new warranties or modify the
existing warranty.

The reproduction, transmission or use of this
document or its contents is not permitted
without express written authority. Offenders
will be liable for damages. All rights are
reserved.

Index
Index Page
-----------------Features & Specifications
----------Mechanical Dimensions/ mounting --------Functional Block diagram
-----------------PF correction technique
-----------------Back Side terminals
-----------------------Typical wiring scheme ---------------------Front Facia
---------------------------------Communication connector connections ----Display of various parameters / Status ---Method of Keyboard/Display usage -------Parameter Submenu -----------------------Commissioning Instruction (before Powerup)
Fault finding Guidelines ---------------------

-1-

1
2
3
4
5
6
7
8
9
10
19
22
24
25

Features:
• Totally Micro-processor controlled Digital Signal processing
logic for measurements.
• All measurements with 1.0 class accuracy.
• Automatic Synchronisation capable of giving the correct
results for wrong connections at CT terminals (even wrong
polarity of CTs).
• Measurement and kVAr compensation are frequency / THD
compensated.
• Load V,Iph, In and Cap. current THD measurement.
• Up-to 6 output banks control.
• Capable of doing the kVAr measurements on basis of mean
of the correction cycle time and provide kVAr compensation.
• Standard 144 X 144 cabinet for panel door flush mounting.
• Serial communication through standard TAS protocols.
• Manual testing mode for user checking of the Capacitor steps
switching.
• Protections provided (user settable):
Over/under Voltage
Cap. Over/under current / THD.
Over/Under frequency (internally set limits)
Over / Under load.
Load unbalance.
Capacitor individual step kVAr monitoring.
Out of steps: Under-compensation (only for indication)
NV-RAM battery down.
• Data logging for various parameters for 2months period at an
interval of 1hr.
• Unit comes along with PC (Windows compatible) software
for downloading and viewing the logged data.

Specifications:
•
•
•
•
•
•
•
•
•
•
•
•

Feed-back Voltage:440Volt (+10%/-30%)
Current input : 1Amp for load and capacitor feed-back.
Measurement Accuracy: Class 1.0
Auxiliary Supply: 525Vac to 300Vac.
Correction / Discharge time:
Selectable in seconds from 10sec. to 240sec.
Output commands:
NO contacts each with current rating of 0.5Amp AC. at
240Vac.
RS-232 baud rate selectable from 4.8kBPS to 38.4kBPS.
Operating temperature: 0 to 55oC.
1.0class measurement Operating temperature: 0 to 50oC.
Storage temperature: -10 to +75oC.
Humidity: 0 to 98%.
Supply frequency: 45Hz to 55Hz.

-2-

Mechanical Dimensions:
135

144

135

120
144

6

Recommended size for cutout on panel door is 138 X 138.
All Dimensions given are in mm.

Maximum weight: (with clamps and terminals) = 2.5kg.

-3-

Functional Block Diagram:
3 channel
Current f.b.

3
Channel
Cap.
Current
f.b.

3 channel
Voltage f.b.

SPF-25

V, I, PF and Power
Measurement
Block
For every AC mains
Cycle.

Calculation
Block for
• Energy Parameters
• Harmonic analysis

EEPROM
For Data
Logging

Keyboard,
Display and
Other support
Functions
Block.

RS-232 Serial
Communication.
TAS-01
Protocol stack.

Power Factor
Correction Block
+ event monitoring.

Outputs Commands
For Capacitor
Switching.

Power Supply
Block.

Above block diagram gives the functional blocks that are built into SPF-25 PF
correction relay.
These blocks are made up with the combination of functions from hardware and
corresponding firmware that resides in the Program memory of the micro-processor
used therein.
Even though the basic blocks exists as shown in the diagram, there functionality is
interdependent. The entire combination is carefully designed so as to have
minimum effects of Electrical and Electromagnetic noise level on the functionality of
this SPF-25.
The firmware written takes into various error handling eventualities so that the
functioning of this PF relay is error free and highly reliable.

-4-

PF correction technique:
KVAr Inductive

Target
PF.
Cos Φ
= PF

1.5 X kVAr
Of Smallest
Capacitor bank

KW

No change band.
KVAr Capacitive
Capacitor Addition band.
Capacitor Removal band.
SPF-25 for kVAr compensation works with the kW v/s kVAr diagram as shown here
above.
A band is created across the target PF value. (Target PF is set by user). This band
is of +0.75 of the smallest capacitor bank kVAr. Thus, total band width is always 1.5
times the smallest capacitor bank kVAr used. This is a no change band. If the
mains source parameters are within this band, SPF-25 would not change the
capacitors bank status.
If the mains parameters are out of this “No change band”, then SPF-25 calculates
the correct capacitor bank combination to be added / subtracted and within one
correction cycle brings it within the No change band.
The no change band width is selected as mentioned because it has to prevent unnecessary hunting (switching on/off) of the capacitor banks.

-5-

Back Side terminals:

Voltage
Feed-Back

Auxiliary
Supply

Current
Feed-Back
Output commands.

-6-

Capacitor
Current
Feed-Back

Typical Wiring with SPF-25 PF correction system.
L
O
A
D

L
C
R
+

L
C
R
-

L
C
Y
+

L
C
Y
-

L
C
B
+

L
C
B
-

PH 3
PH 2
PH 1
CCR+
CCRCCY+
CCYCCB+
CCB-

S
P
F
2
5

Auxiliary
Supply

L1
L2

Com
C01
C02
|

C06

Mains Connections:
Phase 1 control:
Neutral control:
Commands:
Load Current CT:
Capacitor Current CT:

-7-

Front Facia of SPF-25:
LCD Display

Step status LED indication
Serial Communication Port

Membrane Keypad

Usage of the UP and DN key makes the LCD display to scroll up
and down. This is used for display of various status as well as for
viewing the On line measured electrical values.
These keys are also used for changing values in Parameters
Editing mode and used for status changing of banks in Manual
mode.
Usage of ENT key is for entering the submenu and / or for setting
up some values.
The L and R keys are used in changing the position of the cursor
from Left to Right and vice-versa.

-8-

RS-232 serial communication 9 pin D connector:

5

4

6

3

7

2

8

1

9
RXD

GND

TXD

RS-232 cable connection Details:

PIN
NO

PC side
Connection

CONNECTION

SPF-25

1

NC

2

RXD

TXD

3

TXD

RXD

GND

GND

4
5
6
7
8
9

NC

-9-

Display of Various Parameters / Status:
PAGE: 00

COSΦ= -0.99 A OK

This is default display screen giving
information on PF, mode and
working status.

COSΦ= -0.99 :This part of the display indicates the Power Factor running value. The
sign –ve indicates that PF is Capacitive and no sign (+ve) indicates that PF is Inductive.
The PF indicated is the overall PF of the three phase system.
A or M :
This part either indicates the letter “A” or letter “M”. The letter A means
that SPF-25 is working in Auto mode.
The letter M means that SPF-25 is presently in Manual mode.
The Auto or Manual modes can be selected by pressing ENT key on this page.
(If Password option is enabled, enter the same by using UP/DN/L/R keys and then
Pressing ENT)
Then by UP or DN key you can stroll between the displays:
“1. Edit Mode”, “2. Auto Mode”, “3.Manual Mode”.
The first one “1.Edit Mode” is for parameter changing. The details of parameter changing
are explained in detail in later part of this manual.
The second and third one as display indicates are for selecting Auto or Manual mode
respectively. The ENT key pressed on selecting the mode desired, puts the SPF-25 into
that mode.
Auto Mode: In this mode SPF-25 works in automatic mode. It switches the capacitor
banks automatically depending on the parameter setting of target PF. This mode is the
default mode and is to be used for unmanned operation of the system controlled by
SPF-25.
Manual Mode: This mode is activated for checking/testing the capacitor banks switching.
Its also used for changing the Masking status of the capacitor banks. More on this is
explained later. (On Page 01 explanation)
OK or ** :
The last part of the display that is blinking every 500mS indicates the
working status of SPF-25. “OK” indicates that unit is working fine without any trip
conditions. If there is other indication, the meaning of the same can be as:
OK
:
No Fault
OC
:
Over Capacitor Current
UC
:
Under Capacitor Current
OL
:
Over Load
UL
:
Under Load
OV
:
Over Voltage
UV
:
Under Voltage
OF
:
Over Frequency
UF
:
Under Frequency
OH
:
Over Capacitor Current THD %.
OB
:
Out of Banks
LU
:
Load Unbalance
BF
:
Battery Failure (RTC)
NV
:
NVRAM Checksum Error
VA
:
Voltage Absent
- 10 -

PAGE: 01

PAGE: 01

______

AUTO

______

MAN

This display indicates the Bank status in Auto mode and in Manual mode it helps
to make the specific bank On or Off or declare masked.
: Means Bank is On.
: Means Bank is Off.
: Means Bank is Off and is declared masked (out of action)
: Means Bank does not exist for compensation.
When the Page 01 is in Auto mode, its only for indication of Bank status.
But in Manual mode, the “ENT” key press activates the manual control
mode. The cursor over the bank number starts blinking. The UP and DN
keys can turn On and Off the respective bank.
The DN key pressed puts the respective bank in Masking mode and another
press of DN key brings it out of Masking mode.

Putting the bank masking status permanently:
If a bank is to be permanently put in masked mode or is to be brought out of
permanent masked mode, it can be done by bringing the blinking cursor on
the position of the respective bank by use of L or R key. Then by pressing
DN key, bring the status of the bank to the required level (Masked or
Unmasked). Then press ENT key so that cursor stops blinking. After that by
pressing UP key go to Page 00. Then Press ENT. (If Password option is
enabled, enter the same by using UP/DN/L/R keys and then Press ENT)
“1.EDIT MODE” would be displayed. Press ENT one more time. “1.General
and IO” would be displayed. Press ENT again. “Pwd : Disable” or “Pwd :
Enable” would be displayed. Press UP key. “Exit: No Save” would be
displayed. Press ENT so that cursor will start blinking. Press UP. “Exit: With
Save” would be displayed with cursor blinking. Press ENT. “Saving in
EEPROM” would be displayed for a short time and then Page 00 would be
displayed.
You will observe that the bank status as requirement is changed
permanently to the status desired.

- 11 -

PAGE: 02

1.Overall Values
PRESS
PAGE: 02.1

Avg Vol: 415.7 V
PAGE: 02.2

Avg Cur: 0123.4A
PAGE: 02.3

Tot KW:

0081.2

PAGE: 02.4

TotKVAR: 0024.6
PAGE: 02.5

Tot KVA: 0101.1
PAGE: 02.6

Avg CC:

0031.3A

PAGE: 02.7

CKVAR:

028.35

PAGE: 02.8

LS PF:

0.82

PAGE: 02.9

LS KVAR: 0043.9
PAGE: 02.10

LS KVA:

0125.7

PAGE: 02.11

Freq:

49.9Hz

The Overall values Display menu has submenus as displayed above. As its
self explanatory it means:
Avg Vol: Average voltage of all the three line to line voltage values.
Avg Cur: Average current of all the three phase line current values.
Tot KW: Overall kW of the three phase system measured at source.
TotKVAR: Overall kVAr of the three phase system measured at source.
Tot KVA: Overall kVA of the three phase system measured at source.
Avg CC: Average of three phase current through capacitor panel.
CKVAR: Capacitive kVAr that is compensated by the system.
LS PF: Load side PF. (PF value if not compensated.
LS KVAR: Load side kVAr.
LS KVA: Load side kVA.
Freq: Supply frequency in Hz.
- 12 -

PAGE: 03

2.Per-Phase RMS

PRESS
PAGE: 03.1

R-Y Vol: 415.7 V
PAGE: 03.2

Y-B Vol: 415.7 V
PAGE: 03.3

B-R Vol: 415.7 V
PAGE: 03.4

Rph Cur: 0110.8A
PAGE: 03.5

Yph Cur: 0110.8A
PAGE: 03.6

Bph Cur: 0110.8A
PAGE: 03.7

Neutral: 0010.2A
PAGE: 03.8

Rph Cap: 0022.5A
PAGE: 03.9

Yph Cap: 0022.5A
PAGE: 03.10

Bph Cap: 0022.5A

Per Phase RMS: Submenu:
R-Y Vol: Measured AC Voltage RMS value across R and Y phase.
Y-B Vol: Measured AC Voltage RMS value across Y and B phase.
B-R Vol: Measured AC Voltage RMS value across B and R phase.
Rph Cur: Line current RMS value in R phase. Mains source.
Yph Cur: Line current RMS value in Y phase. Mains source.
Bph Cur: Line current RMS value in B phase. Mains source.
Neutral: Neutral current RMS value.
Rph Cap: Capacitor current RMS value in R phase.
Yph Cap: Capacitor current RMS value in Y phase.
Bph Cap: Capacitor current RMS value in B phase.

- 13 -

PAGE: 04

3.Power
PRESS
PAGE: 04.1

Rph PF:

PAGE: 04.10

1.00

Rph KVA: 0109.7

PAGE: 04.2

Yph PF:

PAGE: 04.11

1.00

Yph KVA: 0109.7

PAGE: 04.3

Bph PF:

PAGE: 04.12

1.00

Bph KVA: 0109.7

PAGE: 04.4

Rph KW:

PAGE: 04.13

0100.2

RphCKVAR: 010.76

PAGE: 04.5

Yph KW:

PAGE: 04.14

0100.2

YphCKVAR: 010.76

PAGE: 04.6

Bph KW:

PAGE: 04.15

0100.2

BphCKVAR: 010.76

PAGE: 04.7

PAGE: 04.16

RphKVAR: 0020.4

Rph mF

PAGE: 04.8

: 165.06

PAGE: 04.17

YphKVAR: 0020.4

Yph mF

PAGE: 04.9

: 165.06

PAGE: 04.18

BphKVAR: 0020.4

Bph mF

: 165.06

Power: Submenu:
Rph PF: Power Factor of R phase on mains source.
Yph PF: Power Factor of Y phase on mains source.
Bph PF: Power Factor of B phase on mains source.
Rph kW: Active Power in kW in R-phase.
Yph kW: Active Power in kW in Y-phase.
Bph kW: Active Power in kW in B-phase.
RphkVAR: Reactive Power in kVAr in R-phase.
YphkVAR: Reactive Power in kVAr in Y-phase.
BphkVAR: Reactive Power in kVAr in B-phase.
Rph KVA: Apparent Power in kVA in R-phase.
Yph KVA: Apparent Power in kVA in Y-phase.
Bph KVA: Apparent Power in kVA in B-phase.
RphCKVAR: Capacitor injected reactive power in R-phase.
YphCKVAR: Capacitor injected reactive power in Y-phase.
BphCKVAR: Capacitor injected reactive power in B-phase.
Rph mF: Capacitor value in micro-farad in R-phase.
Yph mF: Capacitor value in micro-farad in Y-phase.
Bph mF: Capacitor value in micro-farad in B-phase.
- 14 -

PAGE: 05

4.Energy
PRESS
PAGE: 05.1

KWH:

1234567.8

PAGE: 05.2

IndKVARH:12345.6
PAGE: 05.3

CapKVARH:12345.6
PAGE: 05.4

KVAH:

1234567.8

PAGE: 05.5

CKVARH:1234567.8

Energy: Submenu:
KWH: Overall cumulative active energy in kWh on Mains supply.
IndKVARH: Inductive reactive energy in kVArh on Mains supply.
CapKVARH: Capacitive reactive energy in kVArh on Mains supply.
KVAH: Overall cumulative apparent energy in kVA on Mains supply.
CKVARH: Capacitor compensated reactive energy in kVArh.

- 15 -

PAGE: 06

5.Harmonics
PRESS
PAGE: 06.1

Vr-THD-F: 002.4%
PAGE: 06.2

Vy-THD-F: 002.4%
PAGE: 06.3

Vb-THD-F: 002.4%
PAGE: 06.4

Ir-THD-F: 012.5%
PAGE: 06.5

Iy-THD-F: 012.5%
PAGE: 06.6

Ib-THD-F: 012.5%
PAGE: 06.7

In-THD-F: 005.0%
PAGE: 06.8

CCr-THD-F:028.2%
PAGE: 06.9

CCy-THD-F:028.2%
PAGE: 06.10

CCb-THD-F:028.2%

Harmonics: Submenu:
Vr-THD-F/R: R-Y line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Vy-THD-F/R: Y-B line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Vb-THD-F/R: B-R line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Ir-THD-F/R: R phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Iy-THD-F/R: Y phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Ib-THD-F/R: B phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
In-THD-F/R: Neutral current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
CCr-THD-F/R: R phase Capacitor current % Total Harmonic Distortion.
CCy-THD-F/R: Y phase Capacitor current % Total Harmonic Distortion.
CCb-THD-F/R: B phase Capacitor current % Total Harmonic Distortion.

- 16 -

PAGE: 07

6.Step KVAR
PRESS
PAGE: 07.1

Stp1 KVAR:0009.0
PAGE: 07.2

Stp2 KVAR:0009.0
PAGE: 07.3

Stp3 KVAR:0009.0
PAGE: 07.4

Stp4 KVAR:0009.0
PAGE: 07.5

Stp5 KVAR:0009.0
PAGE: 07.6

Stp6 KVAR:0009.0

Step KVAR: Submenu:
Stp1 KVAR: Step 1 kVAr value normalized at Capacitor rated voltage.
Stp2 KVAR: Step 2 kVAr value normalized at Capacitor rated voltage.
Stp3 KVAR: Step 3 kVAr value normalized at Capacitor rated voltage.
Stp4 KVAR: Step 4 kVAr value normalized at Capacitor rated voltage.
Stp5 KVAR: Step 5 kVAr value normalized at Capacitor rated voltage.
Stp6 KVAR: Step 6 kVAr value normalized at Capacitor rated voltage.

- 17 -

PAGE: 08

Time: 10:10:00
Real Time Clock: RTC time set in the SPF-25 is displayed here. Its in
HH:MM:SS format.

PAGE: 09

Date: 07:11:06
Real Time Clock: RTC date set in the SPF-25 is displayed here. Its in
dd:mm:yy format.

PAGE: 10

SPF-25 1.0.6

SPF-25 internal firmware version number is displayed here. (Just for user
information)

Total number of Main display pages are 11nos ranging from “00” to
“10”.

- 18 -

Method for Keyboard/Display usage.

Flow chart for entering into different modes:

PRESS
Enable

Default
Display
mode

If Password
Option is
Enable/Disable.

Disable

Enter Pwd: ****
PRESS
Enter the 4
Digit password
By use of
L, R, UP & DN
Keys.

PRESS

NO

IF
PASSWORD
Correct?

*

YES
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

1.Edit Mode

2.Auto Mode

3.Manual Mode

- 19 -

Parameter Editing Submenu Level 1:

*
1.General
2.System
3.Fault
4.Step
5.Communication

Sub-menu
Level 1
for
Parameter
Editing.

Parameter Editing
Sub-Menu
LEVEL 2

1.General and IO: Parameters related with general function and Input/Output
2. System: Electrical system (Mains supply) related parameters.

3. Fault: Setting Faults and fault levels.
4. Step: Capacitor Steps related parameters.
5. Communication: Parameters related with communication and data logging.

- 20 -

Parameter Editing Method:
(For Submenu Level 2 : L2)

Sub-Menu Level 1.
Cursor Blinking
at Parameter Values.

1.Submenu L2: ****

1.Submenu L2: ****
PRESS

key to increment value.

PRESS

Key to decrement value.

PRESS

Key to shift cursor Left.

PRESS

Key to shift cursor Right.
2.Submenu L2: ****

2.Submenu L2: ****
PRESS

key to increment value.

PRESS

Key to decrement value.

PRESS

Key to shift cursor Left.

PRESS

Key to shift cursor Right.

3.Submenu L2: ****

Exit: No Save

Exit: No Save

Without saving

Default
Display.

With saving

Screen for 1second

Saving In EEProm

Exit: With Save

- 21 -

Parameter Editing Submenu Level 2:
Menu
General

Parameter
Pwd
Ch-Pwd
Ld Def
THD
Rst. Energy

Meaning of Parameter
Password Control
Password value
Load all factory default parameters.
Type of THD factor to be displayed
Energy Counters reset to zero option

Default
Enable
1111
No
F-THD
No

Menu
System

Parameter
Meas. Vol.
Ld. Cur. Pr.
Cap. Cur. Pr.
PF Target
PF Target
Auto Sync
Async Tol.
Reset Async

Meaning of Parameter
Default
SPF-25 rated measurement voltage
440
Primary current value of mains CT
0180
0075
Primary current value of capacitor CT
Target PF for deciding Lag or Lead
Lag
1.00
Target PF exact value
Automatic synchronisation requirement Yes
% load variation tolerence for Auto-sync. 30
No
Reset Auto-sync to default value.

Menu
Fault

Parameter
Over Vol.
Over Vol. Lim
Over Vol. Clr
Under Vol.
Under Vol. Lim
Under Vol. Clr
Over Load
Over Ld. Lim
Over Ld. Clr
Under Ld.
Under Ld. Lim
Under Ld. Clr
Ld. Unbalance
Ld. Unb. Lim
Over CC
Over CC. Lim
Over CC. Clr
Over CC. Rst.
Over CC. Rst.
Under CC.
Under CC. Lim
Under CC. CLr
CC THD
CC THD Lim
CC THD Clr
Step Check
Cap. Cur Tol
Under Comp.
RTC Bat

Meaning of Parameter
Default
Over Voltage Fault: action by PDE-30 Off Step
Over Voltage activation limit value
1.10
Over Voltage resumption limit value 1.05
Under Voltage Fault: Action?
Off Step
Under Voltage activation limit value 0.70
Under Voltage resumption limit value 0.75
Over Load Fault: Action?
Indicate
Mains current over load limit value
1.30
Mains cur. over load resume value
1.25
Under Load on Mains: Action?
Indicate
Under load Activation limit value
0.03
Under load Resumption limit value
0.05
Load Un-balance Fault: Action?
Off Step
Load Un-balance limit
025%
Capacitor Over Current Fault: Action? Disable
Cap. Over Current Limit value.
1.30
Cap. Over Current Resume value.
1.25
Auto reset feature on Cap. Over Cur. No
If Over CC. Rst.=Yes. Time for reset. 120 sec
Under Capacitor current fault: Action? Disable
Under Cap. Cur. Limit value.
0.95
Under Cap. Cur. Resume value.
0.97
Capacitor current Over THD: Action? Disable
Cap.Cur. Over THD limit value.
0.10
Cap.Cur. Over THD resume value.
0.08
Every step kVAr healthiness monitor. Disable
Step kVAr healthiness: tolerence.
0.10
Out of Banks Indication.
Disable
RTC Battery fault monitoring.
Enable

- 22 -

Min
Disable
0000
No
R-THD
No
Min
Non
0001
0001
Lead
0.70Lag
No
01
No

Min

Max
Enable
9999
Yes
F-THD
Yes
Max
Edible
9999
9999
Lag
0.85Lead
Yes
50
Yes

Max

Disable, Indicative, Off Step

0.90
0.85

1.20
1.15

Disable, Indicative, Off Step

0.70
0.75

0.95
1.00

Disable, Indicative, Off Step

1.10
1.05

1.30
1.25

Disable, Indicative, Off Step

0.01
0.02

0.20
0.25

Disable, Indicative, Off Step

005%

100%

Disable, Indicative, Off Step

1.05
1.00
No
15

1.50
1.45
Yes
900

Disable, Indicative, Off Step

0.75
0.80

0.98
1.00

Disable, Indicative, Off Step

0.02
0.01
Disable
0.03
Disable
Disable

0.99
0.90
Enable
0.50
Enable
Enable

Menu
Step

Parameter
No. of Steps
Step Vol
Corr. Time
Discharge Time
Step 1 KVAR
Step 2 KVAR
Step 3 KVAR
Step 4 KVAR
Step 5 KVAR
Step 6 KVAR

Meaning of Parameter
Number of Capacitor steps utilised
Voltage at which kVAr is defined
Correction cycle time.
Capacitor discharge time.
Step 1 kVAr value.
Step 2 kVAr value.
Step 3 kVAr value.
Step 4 kVAr value.
Step 5 kVAr value.
Step 6 kVAr value.

Menu
Parameter
Meaning of Parameter
Communication Unit ID
Communication ID of the unit
Baud Rate
Serial communication baud rate.
Time
RTC time to be set
Date
RTC date to be set
Init RTC
Initialise RTC?
Clear NVRAM Clear all contents on NV RAM?

Default
3
440
120 secs
120 secs
006
009
018
018
018
018

Min
1
380
010
010
001
001
001
001
001
001

Default
3001
09600
--No
No

Min
0000
04800
--No
No

Max
6
660
240
240
250
250
250
250
250
250

Max
9999
38400
--Yes
Yes

Note that all the parameters in the Sub-Menu Level 2 should be carefully filled in the
SPF-25. Failing to put the correct parameters can make SPF-25 to malfunction.
Its therefore advised that a trained person should only be allowed to change these
values.

- 23 -

Commissioning Instructions :
before panel is powered up for the first time.
1. Panel Wiring Check
Ensure that all connections in the panel is tightened properly and there are no
loose connections. Also ensure that the wiring is done as per the wiring
diagram.
2. Power Wiring Check
Ensure that the power cables are connected properly from the Panel I/C to the
feeder I/C or the transformer bushings. The connection has to be after the
Load Feed back CT looking from the Transformer side.
Ensure that the Bus Bars and/or Lugs are clean and free of Dust, Corrosion or
Oxidation on the contact sides so that good electrical connection is maintained.
The surface area should be flat so as to get maximum contact area.
If required Clean the Bus Bars and/ or Lugs by rubbing it with Polish Paper to
remove the oxidation layer. Provide contact paste in between the contacts
surfaces.
Not performing this, can result in to a weaker source point for Capacitor
charging during Step on and this can generate undesirable Noise which can
hamper the performance of equipments installed in the capacitor panel.
3. Load Feed Back CT connection.
Ensure that the load feed back CT connections are done properly. Confirm that
correct phase CT is connected with the correct phase input terminals. (Even
though auto sync is capable of taking care of wrong CT polarities or CT
position interchanging, but then on display, the Phase readings may be seen to
be interchanged. (May be R-phase reading would be seen in B-phase and
vice-versa.
CT connections to be done carefully so as to ensure that the wire does not get
open and there is no loose connection.

Loose connection’s or open CT secondary can result in to very high voltages
getting developed in the circuit which can damage the CT and also produce
high levels of noise in the system.

- 24 -

Fault Finding Guidelines :

Fault Type

Probable Reason

Action to Take

Unit Does not
turn ON. No
display on LCD.

•Input auxiliary supply
not coming.
•Input side fuses
blown

•Check the input
supply to restore
•Check fuses in the
unit for OK.

Unit does not
turn On any
capacitors even
if PF is below
Lower PF limit.

•If auto-sync failure
message is there at
Power On.

• Load may be highly
fluctuating so need of
manual
synchronisation only.
• This is OK
condition.

• The load KW is too
low with Under load
fault enable condition.
•Control connections
from SPF-25 to
contactor coils are not
proper

•Check control supply
and connections from
SPF-25 to contactors.

BF indication on
Default display.

• Internal Ni-Cd
3.2Vdc battery used
for RTC and NV RAM
must be drained down.

• Replace this battery
in consultancy with
TAS trained
personnel.

Some Capacitor
banks are
declared as
faulty even if
they are
checked to be
OK.

•Individual step health
monitoring is enabled
and tolerance limits
set are too stringent.
• Capacitor current
THD factor is
continuously
fluctuating.

•Set the tolerance
limits for individual
steps monitoring as
relaxed.
• With continuously
fluctuating THD of
Capacitor current and
higher level of THD
can cause some
errors in individual
step KVAR
measurement. Under
this condition, best is
to keep this feature
disabled.

- 25 -

Fault Finding Guidelines (continued):

Fault Type

Probable Reason

Action to Take

Serial
Communication
is not working.

• Baud rate selection
is not proper.
• Unit ID is not set
properly.
• Serial
communication cable
connections are not
proper.

• Select proper baud
rate.
• Set the unit ID
correctly.
• Check the serial
cable continuity as
per the connections
given earlier in this
manual.

Data logging is
not taking place.

• Possible that RTC
date is not set
properly.

• Change the battery
by help of TAS’s
authorised person.

SPF-25 resets
occasionally on
turning OFF of
any contactor.

• The contactor supply
phase may be the
same as used for SPF25 auxiliary supply.
• RC snubbers/ free
wheeling diodes are
not put with contactor
coils.

• Use the different
phase for control
supply of contactors
and for SPF-25 supply
• Usage of RC
snubbers / free
wheeling diodes is
mandatory.

- 26 -

Corporate Office/Works/Design Centre:
W-61, MIDC, Ambad, Nasik - 422010, Maharashtra (India)
Tel: +91-(253)-2384038 / 2381090
Email: [email protected]
Marketing and After-Sales Service:
A/58, Kamal Pushpa, K.C. Road, Bandra, Mumbai-400050.
Tel: +91-9930513923
Email: [email protected]
Regional Office: Delhi
191-B, Ground Floor, Padam Nagar (Filter Market),
New Delhi - 110007 (India).
Tel: +91-9911615701
Email: [email protected]


Slide 26

Operations Manual
SPF-25/6
AUTOMATIC POWER FACTOR
CONTROLLER

TAS Powertek Pvt. Ltd.
Corporate Office:
W-61, MIDC, Ambad, Nasik - 422010, Maharashtra (India)
Tel: +91-(253)-2384038 / 2381090
Email: [email protected]

NOTE
These instructions do not purport to cover all details or
variations in equipment, nor to provide for every possible
contingency to be met in connection with installation,
operation or maintenance.

Should further information be desired or should particular
problems arise which are not covered sufficiently for the
purchasers purposes, the matter should be referred to our
TAS Powertek Pvt. Ltd., office.
The contents of this instruction Manual shall not become
part of or modify any prior or existing agreement or
relationship. The sales contract contains the entire
obligations of TAS Powertek Pvt. Ltd. The warranty
contained in the contract between the parties is the sole
warranty of TAS Powertek Pvt. Ltd. Any statements
contained herein do not create new warranties or modify the
existing warranty.

The reproduction, transmission or use of this
document or its contents is not permitted
without express written authority. Offenders
will be liable for damages. All rights are
reserved.

Index
Index Page
-----------------Features & Specifications
----------Mechanical Dimensions/ mounting --------Functional Block diagram
-----------------PF correction technique
-----------------Back Side terminals
-----------------------Typical wiring scheme ---------------------Front Facia
---------------------------------Communication connector connections ----Display of various parameters / Status ---Method of Keyboard/Display usage -------Parameter Submenu -----------------------Commissioning Instruction (before Powerup)
Fault finding Guidelines ---------------------

-1-

1
2
3
4
5
6
7
8
9
10
19
22
24
25

Features:
• Totally Micro-processor controlled Digital Signal processing
logic for measurements.
• All measurements with 1.0 class accuracy.
• Automatic Synchronisation capable of giving the correct
results for wrong connections at CT terminals (even wrong
polarity of CTs).
• Measurement and kVAr compensation are frequency / THD
compensated.
• Load V,Iph, In and Cap. current THD measurement.
• Up-to 6 output banks control.
• Capable of doing the kVAr measurements on basis of mean
of the correction cycle time and provide kVAr compensation.
• Standard 144 X 144 cabinet for panel door flush mounting.
• Serial communication through standard TAS protocols.
• Manual testing mode for user checking of the Capacitor steps
switching.
• Protections provided (user settable):
Over/under Voltage
Cap. Over/under current / THD.
Over/Under frequency (internally set limits)
Over / Under load.
Load unbalance.
Capacitor individual step kVAr monitoring.
Out of steps: Under-compensation (only for indication)
NV-RAM battery down.
• Data logging for various parameters for 2months period at an
interval of 1hr.
• Unit comes along with PC (Windows compatible) software
for downloading and viewing the logged data.

Specifications:
•
•
•
•
•
•
•
•
•
•
•
•

Feed-back Voltage:440Volt (+10%/-30%)
Current input : 1Amp for load and capacitor feed-back.
Measurement Accuracy: Class 1.0
Auxiliary Supply: 525Vac to 300Vac.
Correction / Discharge time:
Selectable in seconds from 10sec. to 240sec.
Output commands:
NO contacts each with current rating of 0.5Amp AC. at
240Vac.
RS-232 baud rate selectable from 4.8kBPS to 38.4kBPS.
Operating temperature: 0 to 55oC.
1.0class measurement Operating temperature: 0 to 50oC.
Storage temperature: -10 to +75oC.
Humidity: 0 to 98%.
Supply frequency: 45Hz to 55Hz.

-2-

Mechanical Dimensions:
135

144

135

120
144

6

Recommended size for cutout on panel door is 138 X 138.
All Dimensions given are in mm.

Maximum weight: (with clamps and terminals) = 2.5kg.

-3-

Functional Block Diagram:
3 channel
Current f.b.

3
Channel
Cap.
Current
f.b.

3 channel
Voltage f.b.

SPF-25

V, I, PF and Power
Measurement
Block
For every AC mains
Cycle.

Calculation
Block for
• Energy Parameters
• Harmonic analysis

EEPROM
For Data
Logging

Keyboard,
Display and
Other support
Functions
Block.

RS-232 Serial
Communication.
TAS-01
Protocol stack.

Power Factor
Correction Block
+ event monitoring.

Outputs Commands
For Capacitor
Switching.

Power Supply
Block.

Above block diagram gives the functional blocks that are built into SPF-25 PF
correction relay.
These blocks are made up with the combination of functions from hardware and
corresponding firmware that resides in the Program memory of the micro-processor
used therein.
Even though the basic blocks exists as shown in the diagram, there functionality is
interdependent. The entire combination is carefully designed so as to have
minimum effects of Electrical and Electromagnetic noise level on the functionality of
this SPF-25.
The firmware written takes into various error handling eventualities so that the
functioning of this PF relay is error free and highly reliable.

-4-

PF correction technique:
KVAr Inductive

Target
PF.
Cos Φ
= PF

1.5 X kVAr
Of Smallest
Capacitor bank

KW

No change band.
KVAr Capacitive
Capacitor Addition band.
Capacitor Removal band.
SPF-25 for kVAr compensation works with the kW v/s kVAr diagram as shown here
above.
A band is created across the target PF value. (Target PF is set by user). This band
is of +0.75 of the smallest capacitor bank kVAr. Thus, total band width is always 1.5
times the smallest capacitor bank kVAr used. This is a no change band. If the
mains source parameters are within this band, SPF-25 would not change the
capacitors bank status.
If the mains parameters are out of this “No change band”, then SPF-25 calculates
the correct capacitor bank combination to be added / subtracted and within one
correction cycle brings it within the No change band.
The no change band width is selected as mentioned because it has to prevent unnecessary hunting (switching on/off) of the capacitor banks.

-5-

Back Side terminals:

Voltage
Feed-Back

Auxiliary
Supply

Current
Feed-Back
Output commands.

-6-

Capacitor
Current
Feed-Back

Typical Wiring with SPF-25 PF correction system.
L
O
A
D

L
C
R
+

L
C
R
-

L
C
Y
+

L
C
Y
-

L
C
B
+

L
C
B
-

PH 3
PH 2
PH 1
CCR+
CCRCCY+
CCYCCB+
CCB-

S
P
F
2
5

Auxiliary
Supply

L1
L2

Com
C01
C02
|

C06

Mains Connections:
Phase 1 control:
Neutral control:
Commands:
Load Current CT:
Capacitor Current CT:

-7-

Front Facia of SPF-25:
LCD Display

Step status LED indication
Serial Communication Port

Membrane Keypad

Usage of the UP and DN key makes the LCD display to scroll up
and down. This is used for display of various status as well as for
viewing the On line measured electrical values.
These keys are also used for changing values in Parameters
Editing mode and used for status changing of banks in Manual
mode.
Usage of ENT key is for entering the submenu and / or for setting
up some values.
The L and R keys are used in changing the position of the cursor
from Left to Right and vice-versa.

-8-

RS-232 serial communication 9 pin D connector:

5

4

6

3

7

2

8

1

9
RXD

GND

TXD

RS-232 cable connection Details:

PIN
NO

PC side
Connection

CONNECTION

SPF-25

1

NC

2

RXD

TXD

3

TXD

RXD

GND

GND

4
5
6
7
8
9

NC

-9-

Display of Various Parameters / Status:
PAGE: 00

COSΦ= -0.99 A OK

This is default display screen giving
information on PF, mode and
working status.

COSΦ= -0.99 :This part of the display indicates the Power Factor running value. The
sign –ve indicates that PF is Capacitive and no sign (+ve) indicates that PF is Inductive.
The PF indicated is the overall PF of the three phase system.
A or M :
This part either indicates the letter “A” or letter “M”. The letter A means
that SPF-25 is working in Auto mode.
The letter M means that SPF-25 is presently in Manual mode.
The Auto or Manual modes can be selected by pressing ENT key on this page.
(If Password option is enabled, enter the same by using UP/DN/L/R keys and then
Pressing ENT)
Then by UP or DN key you can stroll between the displays:
“1. Edit Mode”, “2. Auto Mode”, “3.Manual Mode”.
The first one “1.Edit Mode” is for parameter changing. The details of parameter changing
are explained in detail in later part of this manual.
The second and third one as display indicates are for selecting Auto or Manual mode
respectively. The ENT key pressed on selecting the mode desired, puts the SPF-25 into
that mode.
Auto Mode: In this mode SPF-25 works in automatic mode. It switches the capacitor
banks automatically depending on the parameter setting of target PF. This mode is the
default mode and is to be used for unmanned operation of the system controlled by
SPF-25.
Manual Mode: This mode is activated for checking/testing the capacitor banks switching.
Its also used for changing the Masking status of the capacitor banks. More on this is
explained later. (On Page 01 explanation)
OK or ** :
The last part of the display that is blinking every 500mS indicates the
working status of SPF-25. “OK” indicates that unit is working fine without any trip
conditions. If there is other indication, the meaning of the same can be as:
OK
:
No Fault
OC
:
Over Capacitor Current
UC
:
Under Capacitor Current
OL
:
Over Load
UL
:
Under Load
OV
:
Over Voltage
UV
:
Under Voltage
OF
:
Over Frequency
UF
:
Under Frequency
OH
:
Over Capacitor Current THD %.
OB
:
Out of Banks
LU
:
Load Unbalance
BF
:
Battery Failure (RTC)
NV
:
NVRAM Checksum Error
VA
:
Voltage Absent
- 10 -

PAGE: 01

PAGE: 01

______

AUTO

______

MAN

This display indicates the Bank status in Auto mode and in Manual mode it helps
to make the specific bank On or Off or declare masked.
: Means Bank is On.
: Means Bank is Off.
: Means Bank is Off and is declared masked (out of action)
: Means Bank does not exist for compensation.
When the Page 01 is in Auto mode, its only for indication of Bank status.
But in Manual mode, the “ENT” key press activates the manual control
mode. The cursor over the bank number starts blinking. The UP and DN
keys can turn On and Off the respective bank.
The DN key pressed puts the respective bank in Masking mode and another
press of DN key brings it out of Masking mode.

Putting the bank masking status permanently:
If a bank is to be permanently put in masked mode or is to be brought out of
permanent masked mode, it can be done by bringing the blinking cursor on
the position of the respective bank by use of L or R key. Then by pressing
DN key, bring the status of the bank to the required level (Masked or
Unmasked). Then press ENT key so that cursor stops blinking. After that by
pressing UP key go to Page 00. Then Press ENT. (If Password option is
enabled, enter the same by using UP/DN/L/R keys and then Press ENT)
“1.EDIT MODE” would be displayed. Press ENT one more time. “1.General
and IO” would be displayed. Press ENT again. “Pwd : Disable” or “Pwd :
Enable” would be displayed. Press UP key. “Exit: No Save” would be
displayed. Press ENT so that cursor will start blinking. Press UP. “Exit: With
Save” would be displayed with cursor blinking. Press ENT. “Saving in
EEPROM” would be displayed for a short time and then Page 00 would be
displayed.
You will observe that the bank status as requirement is changed
permanently to the status desired.

- 11 -

PAGE: 02

1.Overall Values
PRESS
PAGE: 02.1

Avg Vol: 415.7 V
PAGE: 02.2

Avg Cur: 0123.4A
PAGE: 02.3

Tot KW:

0081.2

PAGE: 02.4

TotKVAR: 0024.6
PAGE: 02.5

Tot KVA: 0101.1
PAGE: 02.6

Avg CC:

0031.3A

PAGE: 02.7

CKVAR:

028.35

PAGE: 02.8

LS PF:

0.82

PAGE: 02.9

LS KVAR: 0043.9
PAGE: 02.10

LS KVA:

0125.7

PAGE: 02.11

Freq:

49.9Hz

The Overall values Display menu has submenus as displayed above. As its
self explanatory it means:
Avg Vol: Average voltage of all the three line to line voltage values.
Avg Cur: Average current of all the three phase line current values.
Tot KW: Overall kW of the three phase system measured at source.
TotKVAR: Overall kVAr of the three phase system measured at source.
Tot KVA: Overall kVA of the three phase system measured at source.
Avg CC: Average of three phase current through capacitor panel.
CKVAR: Capacitive kVAr that is compensated by the system.
LS PF: Load side PF. (PF value if not compensated.
LS KVAR: Load side kVAr.
LS KVA: Load side kVA.
Freq: Supply frequency in Hz.
- 12 -

PAGE: 03

2.Per-Phase RMS

PRESS
PAGE: 03.1

R-Y Vol: 415.7 V
PAGE: 03.2

Y-B Vol: 415.7 V
PAGE: 03.3

B-R Vol: 415.7 V
PAGE: 03.4

Rph Cur: 0110.8A
PAGE: 03.5

Yph Cur: 0110.8A
PAGE: 03.6

Bph Cur: 0110.8A
PAGE: 03.7

Neutral: 0010.2A
PAGE: 03.8

Rph Cap: 0022.5A
PAGE: 03.9

Yph Cap: 0022.5A
PAGE: 03.10

Bph Cap: 0022.5A

Per Phase RMS: Submenu:
R-Y Vol: Measured AC Voltage RMS value across R and Y phase.
Y-B Vol: Measured AC Voltage RMS value across Y and B phase.
B-R Vol: Measured AC Voltage RMS value across B and R phase.
Rph Cur: Line current RMS value in R phase. Mains source.
Yph Cur: Line current RMS value in Y phase. Mains source.
Bph Cur: Line current RMS value in B phase. Mains source.
Neutral: Neutral current RMS value.
Rph Cap: Capacitor current RMS value in R phase.
Yph Cap: Capacitor current RMS value in Y phase.
Bph Cap: Capacitor current RMS value in B phase.

- 13 -

PAGE: 04

3.Power
PRESS
PAGE: 04.1

Rph PF:

PAGE: 04.10

1.00

Rph KVA: 0109.7

PAGE: 04.2

Yph PF:

PAGE: 04.11

1.00

Yph KVA: 0109.7

PAGE: 04.3

Bph PF:

PAGE: 04.12

1.00

Bph KVA: 0109.7

PAGE: 04.4

Rph KW:

PAGE: 04.13

0100.2

RphCKVAR: 010.76

PAGE: 04.5

Yph KW:

PAGE: 04.14

0100.2

YphCKVAR: 010.76

PAGE: 04.6

Bph KW:

PAGE: 04.15

0100.2

BphCKVAR: 010.76

PAGE: 04.7

PAGE: 04.16

RphKVAR: 0020.4

Rph mF

PAGE: 04.8

: 165.06

PAGE: 04.17

YphKVAR: 0020.4

Yph mF

PAGE: 04.9

: 165.06

PAGE: 04.18

BphKVAR: 0020.4

Bph mF

: 165.06

Power: Submenu:
Rph PF: Power Factor of R phase on mains source.
Yph PF: Power Factor of Y phase on mains source.
Bph PF: Power Factor of B phase on mains source.
Rph kW: Active Power in kW in R-phase.
Yph kW: Active Power in kW in Y-phase.
Bph kW: Active Power in kW in B-phase.
RphkVAR: Reactive Power in kVAr in R-phase.
YphkVAR: Reactive Power in kVAr in Y-phase.
BphkVAR: Reactive Power in kVAr in B-phase.
Rph KVA: Apparent Power in kVA in R-phase.
Yph KVA: Apparent Power in kVA in Y-phase.
Bph KVA: Apparent Power in kVA in B-phase.
RphCKVAR: Capacitor injected reactive power in R-phase.
YphCKVAR: Capacitor injected reactive power in Y-phase.
BphCKVAR: Capacitor injected reactive power in B-phase.
Rph mF: Capacitor value in micro-farad in R-phase.
Yph mF: Capacitor value in micro-farad in Y-phase.
Bph mF: Capacitor value in micro-farad in B-phase.
- 14 -

PAGE: 05

4.Energy
PRESS
PAGE: 05.1

KWH:

1234567.8

PAGE: 05.2

IndKVARH:12345.6
PAGE: 05.3

CapKVARH:12345.6
PAGE: 05.4

KVAH:

1234567.8

PAGE: 05.5

CKVARH:1234567.8

Energy: Submenu:
KWH: Overall cumulative active energy in kWh on Mains supply.
IndKVARH: Inductive reactive energy in kVArh on Mains supply.
CapKVARH: Capacitive reactive energy in kVArh on Mains supply.
KVAH: Overall cumulative apparent energy in kVA on Mains supply.
CKVARH: Capacitor compensated reactive energy in kVArh.

- 15 -

PAGE: 06

5.Harmonics
PRESS
PAGE: 06.1

Vr-THD-F: 002.4%
PAGE: 06.2

Vy-THD-F: 002.4%
PAGE: 06.3

Vb-THD-F: 002.4%
PAGE: 06.4

Ir-THD-F: 012.5%
PAGE: 06.5

Iy-THD-F: 012.5%
PAGE: 06.6

Ib-THD-F: 012.5%
PAGE: 06.7

In-THD-F: 005.0%
PAGE: 06.8

CCr-THD-F:028.2%
PAGE: 06.9

CCy-THD-F:028.2%
PAGE: 06.10

CCb-THD-F:028.2%

Harmonics: Submenu:
Vr-THD-F/R: R-Y line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Vy-THD-F/R: Y-B line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Vb-THD-F/R: B-R line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Ir-THD-F/R: R phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Iy-THD-F/R: Y phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Ib-THD-F/R: B phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
In-THD-F/R: Neutral current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
CCr-THD-F/R: R phase Capacitor current % Total Harmonic Distortion.
CCy-THD-F/R: Y phase Capacitor current % Total Harmonic Distortion.
CCb-THD-F/R: B phase Capacitor current % Total Harmonic Distortion.

- 16 -

PAGE: 07

6.Step KVAR
PRESS
PAGE: 07.1

Stp1 KVAR:0009.0
PAGE: 07.2

Stp2 KVAR:0009.0
PAGE: 07.3

Stp3 KVAR:0009.0
PAGE: 07.4

Stp4 KVAR:0009.0
PAGE: 07.5

Stp5 KVAR:0009.0
PAGE: 07.6

Stp6 KVAR:0009.0

Step KVAR: Submenu:
Stp1 KVAR: Step 1 kVAr value normalized at Capacitor rated voltage.
Stp2 KVAR: Step 2 kVAr value normalized at Capacitor rated voltage.
Stp3 KVAR: Step 3 kVAr value normalized at Capacitor rated voltage.
Stp4 KVAR: Step 4 kVAr value normalized at Capacitor rated voltage.
Stp5 KVAR: Step 5 kVAr value normalized at Capacitor rated voltage.
Stp6 KVAR: Step 6 kVAr value normalized at Capacitor rated voltage.

- 17 -

PAGE: 08

Time: 10:10:00
Real Time Clock: RTC time set in the SPF-25 is displayed here. Its in
HH:MM:SS format.

PAGE: 09

Date: 07:11:06
Real Time Clock: RTC date set in the SPF-25 is displayed here. Its in
dd:mm:yy format.

PAGE: 10

SPF-25 1.0.6

SPF-25 internal firmware version number is displayed here. (Just for user
information)

Total number of Main display pages are 11nos ranging from “00” to
“10”.

- 18 -

Method for Keyboard/Display usage.

Flow chart for entering into different modes:

PRESS
Enable

Default
Display
mode

If Password
Option is
Enable/Disable.

Disable

Enter Pwd: ****
PRESS
Enter the 4
Digit password
By use of
L, R, UP & DN
Keys.

PRESS

NO

IF
PASSWORD
Correct?

*

YES
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

1.Edit Mode

2.Auto Mode

3.Manual Mode

- 19 -

Parameter Editing Submenu Level 1:

*
1.General
2.System
3.Fault
4.Step
5.Communication

Sub-menu
Level 1
for
Parameter
Editing.

Parameter Editing
Sub-Menu
LEVEL 2

1.General and IO: Parameters related with general function and Input/Output
2. System: Electrical system (Mains supply) related parameters.

3. Fault: Setting Faults and fault levels.
4. Step: Capacitor Steps related parameters.
5. Communication: Parameters related with communication and data logging.

- 20 -

Parameter Editing Method:
(For Submenu Level 2 : L2)

Sub-Menu Level 1.
Cursor Blinking
at Parameter Values.

1.Submenu L2: ****

1.Submenu L2: ****
PRESS

key to increment value.

PRESS

Key to decrement value.

PRESS

Key to shift cursor Left.

PRESS

Key to shift cursor Right.
2.Submenu L2: ****

2.Submenu L2: ****
PRESS

key to increment value.

PRESS

Key to decrement value.

PRESS

Key to shift cursor Left.

PRESS

Key to shift cursor Right.

3.Submenu L2: ****

Exit: No Save

Exit: No Save

Without saving

Default
Display.

With saving

Screen for 1second

Saving In EEProm

Exit: With Save

- 21 -

Parameter Editing Submenu Level 2:
Menu
General

Parameter
Pwd
Ch-Pwd
Ld Def
THD
Rst. Energy

Meaning of Parameter
Password Control
Password value
Load all factory default parameters.
Type of THD factor to be displayed
Energy Counters reset to zero option

Default
Enable
1111
No
F-THD
No

Menu
System

Parameter
Meas. Vol.
Ld. Cur. Pr.
Cap. Cur. Pr.
PF Target
PF Target
Auto Sync
Async Tol.
Reset Async

Meaning of Parameter
Default
SPF-25 rated measurement voltage
440
Primary current value of mains CT
0180
0075
Primary current value of capacitor CT
Target PF for deciding Lag or Lead
Lag
1.00
Target PF exact value
Automatic synchronisation requirement Yes
% load variation tolerence for Auto-sync. 30
No
Reset Auto-sync to default value.

Menu
Fault

Parameter
Over Vol.
Over Vol. Lim
Over Vol. Clr
Under Vol.
Under Vol. Lim
Under Vol. Clr
Over Load
Over Ld. Lim
Over Ld. Clr
Under Ld.
Under Ld. Lim
Under Ld. Clr
Ld. Unbalance
Ld. Unb. Lim
Over CC
Over CC. Lim
Over CC. Clr
Over CC. Rst.
Over CC. Rst.
Under CC.
Under CC. Lim
Under CC. CLr
CC THD
CC THD Lim
CC THD Clr
Step Check
Cap. Cur Tol
Under Comp.
RTC Bat

Meaning of Parameter
Default
Over Voltage Fault: action by PDE-30 Off Step
Over Voltage activation limit value
1.10
Over Voltage resumption limit value 1.05
Under Voltage Fault: Action?
Off Step
Under Voltage activation limit value 0.70
Under Voltage resumption limit value 0.75
Over Load Fault: Action?
Indicate
Mains current over load limit value
1.30
Mains cur. over load resume value
1.25
Under Load on Mains: Action?
Indicate
Under load Activation limit value
0.03
Under load Resumption limit value
0.05
Load Un-balance Fault: Action?
Off Step
Load Un-balance limit
025%
Capacitor Over Current Fault: Action? Disable
Cap. Over Current Limit value.
1.30
Cap. Over Current Resume value.
1.25
Auto reset feature on Cap. Over Cur. No
If Over CC. Rst.=Yes. Time for reset. 120 sec
Under Capacitor current fault: Action? Disable
Under Cap. Cur. Limit value.
0.95
Under Cap. Cur. Resume value.
0.97
Capacitor current Over THD: Action? Disable
Cap.Cur. Over THD limit value.
0.10
Cap.Cur. Over THD resume value.
0.08
Every step kVAr healthiness monitor. Disable
Step kVAr healthiness: tolerence.
0.10
Out of Banks Indication.
Disable
RTC Battery fault monitoring.
Enable

- 22 -

Min
Disable
0000
No
R-THD
No
Min
Non
0001
0001
Lead
0.70Lag
No
01
No

Min

Max
Enable
9999
Yes
F-THD
Yes
Max
Edible
9999
9999
Lag
0.85Lead
Yes
50
Yes

Max

Disable, Indicative, Off Step

0.90
0.85

1.20
1.15

Disable, Indicative, Off Step

0.70
0.75

0.95
1.00

Disable, Indicative, Off Step

1.10
1.05

1.30
1.25

Disable, Indicative, Off Step

0.01
0.02

0.20
0.25

Disable, Indicative, Off Step

005%

100%

Disable, Indicative, Off Step

1.05
1.00
No
15

1.50
1.45
Yes
900

Disable, Indicative, Off Step

0.75
0.80

0.98
1.00

Disable, Indicative, Off Step

0.02
0.01
Disable
0.03
Disable
Disable

0.99
0.90
Enable
0.50
Enable
Enable

Menu
Step

Parameter
No. of Steps
Step Vol
Corr. Time
Discharge Time
Step 1 KVAR
Step 2 KVAR
Step 3 KVAR
Step 4 KVAR
Step 5 KVAR
Step 6 KVAR

Meaning of Parameter
Number of Capacitor steps utilised
Voltage at which kVAr is defined
Correction cycle time.
Capacitor discharge time.
Step 1 kVAr value.
Step 2 kVAr value.
Step 3 kVAr value.
Step 4 kVAr value.
Step 5 kVAr value.
Step 6 kVAr value.

Menu
Parameter
Meaning of Parameter
Communication Unit ID
Communication ID of the unit
Baud Rate
Serial communication baud rate.
Time
RTC time to be set
Date
RTC date to be set
Init RTC
Initialise RTC?
Clear NVRAM Clear all contents on NV RAM?

Default
3
440
120 secs
120 secs
006
009
018
018
018
018

Min
1
380
010
010
001
001
001
001
001
001

Default
3001
09600
--No
No

Min
0000
04800
--No
No

Max
6
660
240
240
250
250
250
250
250
250

Max
9999
38400
--Yes
Yes

Note that all the parameters in the Sub-Menu Level 2 should be carefully filled in the
SPF-25. Failing to put the correct parameters can make SPF-25 to malfunction.
Its therefore advised that a trained person should only be allowed to change these
values.

- 23 -

Commissioning Instructions :
before panel is powered up for the first time.
1. Panel Wiring Check
Ensure that all connections in the panel is tightened properly and there are no
loose connections. Also ensure that the wiring is done as per the wiring
diagram.
2. Power Wiring Check
Ensure that the power cables are connected properly from the Panel I/C to the
feeder I/C or the transformer bushings. The connection has to be after the
Load Feed back CT looking from the Transformer side.
Ensure that the Bus Bars and/or Lugs are clean and free of Dust, Corrosion or
Oxidation on the contact sides so that good electrical connection is maintained.
The surface area should be flat so as to get maximum contact area.
If required Clean the Bus Bars and/ or Lugs by rubbing it with Polish Paper to
remove the oxidation layer. Provide contact paste in between the contacts
surfaces.
Not performing this, can result in to a weaker source point for Capacitor
charging during Step on and this can generate undesirable Noise which can
hamper the performance of equipments installed in the capacitor panel.
3. Load Feed Back CT connection.
Ensure that the load feed back CT connections are done properly. Confirm that
correct phase CT is connected with the correct phase input terminals. (Even
though auto sync is capable of taking care of wrong CT polarities or CT
position interchanging, but then on display, the Phase readings may be seen to
be interchanged. (May be R-phase reading would be seen in B-phase and
vice-versa.
CT connections to be done carefully so as to ensure that the wire does not get
open and there is no loose connection.

Loose connection’s or open CT secondary can result in to very high voltages
getting developed in the circuit which can damage the CT and also produce
high levels of noise in the system.

- 24 -

Fault Finding Guidelines :

Fault Type

Probable Reason

Action to Take

Unit Does not
turn ON. No
display on LCD.

•Input auxiliary supply
not coming.
•Input side fuses
blown

•Check the input
supply to restore
•Check fuses in the
unit for OK.

Unit does not
turn On any
capacitors even
if PF is below
Lower PF limit.

•If auto-sync failure
message is there at
Power On.

• Load may be highly
fluctuating so need of
manual
synchronisation only.
• This is OK
condition.

• The load KW is too
low with Under load
fault enable condition.
•Control connections
from SPF-25 to
contactor coils are not
proper

•Check control supply
and connections from
SPF-25 to contactors.

BF indication on
Default display.

• Internal Ni-Cd
3.2Vdc battery used
for RTC and NV RAM
must be drained down.

• Replace this battery
in consultancy with
TAS trained
personnel.

Some Capacitor
banks are
declared as
faulty even if
they are
checked to be
OK.

•Individual step health
monitoring is enabled
and tolerance limits
set are too stringent.
• Capacitor current
THD factor is
continuously
fluctuating.

•Set the tolerance
limits for individual
steps monitoring as
relaxed.
• With continuously
fluctuating THD of
Capacitor current and
higher level of THD
can cause some
errors in individual
step KVAR
measurement. Under
this condition, best is
to keep this feature
disabled.

- 25 -

Fault Finding Guidelines (continued):

Fault Type

Probable Reason

Action to Take

Serial
Communication
is not working.

• Baud rate selection
is not proper.
• Unit ID is not set
properly.
• Serial
communication cable
connections are not
proper.

• Select proper baud
rate.
• Set the unit ID
correctly.
• Check the serial
cable continuity as
per the connections
given earlier in this
manual.

Data logging is
not taking place.

• Possible that RTC
date is not set
properly.

• Change the battery
by help of TAS’s
authorised person.

SPF-25 resets
occasionally on
turning OFF of
any contactor.

• The contactor supply
phase may be the
same as used for SPF25 auxiliary supply.
• RC snubbers/ free
wheeling diodes are
not put with contactor
coils.

• Use the different
phase for control
supply of contactors
and for SPF-25 supply
• Usage of RC
snubbers / free
wheeling diodes is
mandatory.

- 26 -

Corporate Office/Works/Design Centre:
W-61, MIDC, Ambad, Nasik - 422010, Maharashtra (India)
Tel: +91-(253)-2384038 / 2381090
Email: [email protected]
Marketing and After-Sales Service:
A/58, Kamal Pushpa, K.C. Road, Bandra, Mumbai-400050.
Tel: +91-9930513923
Email: [email protected]
Regional Office: Delhi
191-B, Ground Floor, Padam Nagar (Filter Market),
New Delhi - 110007 (India).
Tel: +91-9911615701
Email: [email protected]


Slide 27

Operations Manual
SPF-25/6
AUTOMATIC POWER FACTOR
CONTROLLER

TAS Powertek Pvt. Ltd.
Corporate Office:
W-61, MIDC, Ambad, Nasik - 422010, Maharashtra (India)
Tel: +91-(253)-2384038 / 2381090
Email: [email protected]

NOTE
These instructions do not purport to cover all details or
variations in equipment, nor to provide for every possible
contingency to be met in connection with installation,
operation or maintenance.

Should further information be desired or should particular
problems arise which are not covered sufficiently for the
purchasers purposes, the matter should be referred to our
TAS Powertek Pvt. Ltd., office.
The contents of this instruction Manual shall not become
part of or modify any prior or existing agreement or
relationship. The sales contract contains the entire
obligations of TAS Powertek Pvt. Ltd. The warranty
contained in the contract between the parties is the sole
warranty of TAS Powertek Pvt. Ltd. Any statements
contained herein do not create new warranties or modify the
existing warranty.

The reproduction, transmission or use of this
document or its contents is not permitted
without express written authority. Offenders
will be liable for damages. All rights are
reserved.

Index
Index Page
-----------------Features & Specifications
----------Mechanical Dimensions/ mounting --------Functional Block diagram
-----------------PF correction technique
-----------------Back Side terminals
-----------------------Typical wiring scheme ---------------------Front Facia
---------------------------------Communication connector connections ----Display of various parameters / Status ---Method of Keyboard/Display usage -------Parameter Submenu -----------------------Commissioning Instruction (before Powerup)
Fault finding Guidelines ---------------------

-1-

1
2
3
4
5
6
7
8
9
10
19
22
24
25

Features:
• Totally Micro-processor controlled Digital Signal processing
logic for measurements.
• All measurements with 1.0 class accuracy.
• Automatic Synchronisation capable of giving the correct
results for wrong connections at CT terminals (even wrong
polarity of CTs).
• Measurement and kVAr compensation are frequency / THD
compensated.
• Load V,Iph, In and Cap. current THD measurement.
• Up-to 6 output banks control.
• Capable of doing the kVAr measurements on basis of mean
of the correction cycle time and provide kVAr compensation.
• Standard 144 X 144 cabinet for panel door flush mounting.
• Serial communication through standard TAS protocols.
• Manual testing mode for user checking of the Capacitor steps
switching.
• Protections provided (user settable):
Over/under Voltage
Cap. Over/under current / THD.
Over/Under frequency (internally set limits)
Over / Under load.
Load unbalance.
Capacitor individual step kVAr monitoring.
Out of steps: Under-compensation (only for indication)
NV-RAM battery down.
• Data logging for various parameters for 2months period at an
interval of 1hr.
• Unit comes along with PC (Windows compatible) software
for downloading and viewing the logged data.

Specifications:
•
•
•
•
•
•
•
•
•
•
•
•

Feed-back Voltage:440Volt (+10%/-30%)
Current input : 1Amp for load and capacitor feed-back.
Measurement Accuracy: Class 1.0
Auxiliary Supply: 525Vac to 300Vac.
Correction / Discharge time:
Selectable in seconds from 10sec. to 240sec.
Output commands:
NO contacts each with current rating of 0.5Amp AC. at
240Vac.
RS-232 baud rate selectable from 4.8kBPS to 38.4kBPS.
Operating temperature: 0 to 55oC.
1.0class measurement Operating temperature: 0 to 50oC.
Storage temperature: -10 to +75oC.
Humidity: 0 to 98%.
Supply frequency: 45Hz to 55Hz.

-2-

Mechanical Dimensions:
135

144

135

120
144

6

Recommended size for cutout on panel door is 138 X 138.
All Dimensions given are in mm.

Maximum weight: (with clamps and terminals) = 2.5kg.

-3-

Functional Block Diagram:
3 channel
Current f.b.

3
Channel
Cap.
Current
f.b.

3 channel
Voltage f.b.

SPF-25

V, I, PF and Power
Measurement
Block
For every AC mains
Cycle.

Calculation
Block for
• Energy Parameters
• Harmonic analysis

EEPROM
For Data
Logging

Keyboard,
Display and
Other support
Functions
Block.

RS-232 Serial
Communication.
TAS-01
Protocol stack.

Power Factor
Correction Block
+ event monitoring.

Outputs Commands
For Capacitor
Switching.

Power Supply
Block.

Above block diagram gives the functional blocks that are built into SPF-25 PF
correction relay.
These blocks are made up with the combination of functions from hardware and
corresponding firmware that resides in the Program memory of the micro-processor
used therein.
Even though the basic blocks exists as shown in the diagram, there functionality is
interdependent. The entire combination is carefully designed so as to have
minimum effects of Electrical and Electromagnetic noise level on the functionality of
this SPF-25.
The firmware written takes into various error handling eventualities so that the
functioning of this PF relay is error free and highly reliable.

-4-

PF correction technique:
KVAr Inductive

Target
PF.
Cos Φ
= PF

1.5 X kVAr
Of Smallest
Capacitor bank

KW

No change band.
KVAr Capacitive
Capacitor Addition band.
Capacitor Removal band.
SPF-25 for kVAr compensation works with the kW v/s kVAr diagram as shown here
above.
A band is created across the target PF value. (Target PF is set by user). This band
is of +0.75 of the smallest capacitor bank kVAr. Thus, total band width is always 1.5
times the smallest capacitor bank kVAr used. This is a no change band. If the
mains source parameters are within this band, SPF-25 would not change the
capacitors bank status.
If the mains parameters are out of this “No change band”, then SPF-25 calculates
the correct capacitor bank combination to be added / subtracted and within one
correction cycle brings it within the No change band.
The no change band width is selected as mentioned because it has to prevent unnecessary hunting (switching on/off) of the capacitor banks.

-5-

Back Side terminals:

Voltage
Feed-Back

Auxiliary
Supply

Current
Feed-Back
Output commands.

-6-

Capacitor
Current
Feed-Back

Typical Wiring with SPF-25 PF correction system.
L
O
A
D

L
C
R
+

L
C
R
-

L
C
Y
+

L
C
Y
-

L
C
B
+

L
C
B
-

PH 3
PH 2
PH 1
CCR+
CCRCCY+
CCYCCB+
CCB-

S
P
F
2
5

Auxiliary
Supply

L1
L2

Com
C01
C02
|

C06

Mains Connections:
Phase 1 control:
Neutral control:
Commands:
Load Current CT:
Capacitor Current CT:

-7-

Front Facia of SPF-25:
LCD Display

Step status LED indication
Serial Communication Port

Membrane Keypad

Usage of the UP and DN key makes the LCD display to scroll up
and down. This is used for display of various status as well as for
viewing the On line measured electrical values.
These keys are also used for changing values in Parameters
Editing mode and used for status changing of banks in Manual
mode.
Usage of ENT key is for entering the submenu and / or for setting
up some values.
The L and R keys are used in changing the position of the cursor
from Left to Right and vice-versa.

-8-

RS-232 serial communication 9 pin D connector:

5

4

6

3

7

2

8

1

9
RXD

GND

TXD

RS-232 cable connection Details:

PIN
NO

PC side
Connection

CONNECTION

SPF-25

1

NC

2

RXD

TXD

3

TXD

RXD

GND

GND

4
5
6
7
8
9

NC

-9-

Display of Various Parameters / Status:
PAGE: 00

COSΦ= -0.99 A OK

This is default display screen giving
information on PF, mode and
working status.

COSΦ= -0.99 :This part of the display indicates the Power Factor running value. The
sign –ve indicates that PF is Capacitive and no sign (+ve) indicates that PF is Inductive.
The PF indicated is the overall PF of the three phase system.
A or M :
This part either indicates the letter “A” or letter “M”. The letter A means
that SPF-25 is working in Auto mode.
The letter M means that SPF-25 is presently in Manual mode.
The Auto or Manual modes can be selected by pressing ENT key on this page.
(If Password option is enabled, enter the same by using UP/DN/L/R keys and then
Pressing ENT)
Then by UP or DN key you can stroll between the displays:
“1. Edit Mode”, “2. Auto Mode”, “3.Manual Mode”.
The first one “1.Edit Mode” is for parameter changing. The details of parameter changing
are explained in detail in later part of this manual.
The second and third one as display indicates are for selecting Auto or Manual mode
respectively. The ENT key pressed on selecting the mode desired, puts the SPF-25 into
that mode.
Auto Mode: In this mode SPF-25 works in automatic mode. It switches the capacitor
banks automatically depending on the parameter setting of target PF. This mode is the
default mode and is to be used for unmanned operation of the system controlled by
SPF-25.
Manual Mode: This mode is activated for checking/testing the capacitor banks switching.
Its also used for changing the Masking status of the capacitor banks. More on this is
explained later. (On Page 01 explanation)
OK or ** :
The last part of the display that is blinking every 500mS indicates the
working status of SPF-25. “OK” indicates that unit is working fine without any trip
conditions. If there is other indication, the meaning of the same can be as:
OK
:
No Fault
OC
:
Over Capacitor Current
UC
:
Under Capacitor Current
OL
:
Over Load
UL
:
Under Load
OV
:
Over Voltage
UV
:
Under Voltage
OF
:
Over Frequency
UF
:
Under Frequency
OH
:
Over Capacitor Current THD %.
OB
:
Out of Banks
LU
:
Load Unbalance
BF
:
Battery Failure (RTC)
NV
:
NVRAM Checksum Error
VA
:
Voltage Absent
- 10 -

PAGE: 01

PAGE: 01

______

AUTO

______

MAN

This display indicates the Bank status in Auto mode and in Manual mode it helps
to make the specific bank On or Off or declare masked.
: Means Bank is On.
: Means Bank is Off.
: Means Bank is Off and is declared masked (out of action)
: Means Bank does not exist for compensation.
When the Page 01 is in Auto mode, its only for indication of Bank status.
But in Manual mode, the “ENT” key press activates the manual control
mode. The cursor over the bank number starts blinking. The UP and DN
keys can turn On and Off the respective bank.
The DN key pressed puts the respective bank in Masking mode and another
press of DN key brings it out of Masking mode.

Putting the bank masking status permanently:
If a bank is to be permanently put in masked mode or is to be brought out of
permanent masked mode, it can be done by bringing the blinking cursor on
the position of the respective bank by use of L or R key. Then by pressing
DN key, bring the status of the bank to the required level (Masked or
Unmasked). Then press ENT key so that cursor stops blinking. After that by
pressing UP key go to Page 00. Then Press ENT. (If Password option is
enabled, enter the same by using UP/DN/L/R keys and then Press ENT)
“1.EDIT MODE” would be displayed. Press ENT one more time. “1.General
and IO” would be displayed. Press ENT again. “Pwd : Disable” or “Pwd :
Enable” would be displayed. Press UP key. “Exit: No Save” would be
displayed. Press ENT so that cursor will start blinking. Press UP. “Exit: With
Save” would be displayed with cursor blinking. Press ENT. “Saving in
EEPROM” would be displayed for a short time and then Page 00 would be
displayed.
You will observe that the bank status as requirement is changed
permanently to the status desired.

- 11 -

PAGE: 02

1.Overall Values
PRESS
PAGE: 02.1

Avg Vol: 415.7 V
PAGE: 02.2

Avg Cur: 0123.4A
PAGE: 02.3

Tot KW:

0081.2

PAGE: 02.4

TotKVAR: 0024.6
PAGE: 02.5

Tot KVA: 0101.1
PAGE: 02.6

Avg CC:

0031.3A

PAGE: 02.7

CKVAR:

028.35

PAGE: 02.8

LS PF:

0.82

PAGE: 02.9

LS KVAR: 0043.9
PAGE: 02.10

LS KVA:

0125.7

PAGE: 02.11

Freq:

49.9Hz

The Overall values Display menu has submenus as displayed above. As its
self explanatory it means:
Avg Vol: Average voltage of all the three line to line voltage values.
Avg Cur: Average current of all the three phase line current values.
Tot KW: Overall kW of the three phase system measured at source.
TotKVAR: Overall kVAr of the three phase system measured at source.
Tot KVA: Overall kVA of the three phase system measured at source.
Avg CC: Average of three phase current through capacitor panel.
CKVAR: Capacitive kVAr that is compensated by the system.
LS PF: Load side PF. (PF value if not compensated.
LS KVAR: Load side kVAr.
LS KVA: Load side kVA.
Freq: Supply frequency in Hz.
- 12 -

PAGE: 03

2.Per-Phase RMS

PRESS
PAGE: 03.1

R-Y Vol: 415.7 V
PAGE: 03.2

Y-B Vol: 415.7 V
PAGE: 03.3

B-R Vol: 415.7 V
PAGE: 03.4

Rph Cur: 0110.8A
PAGE: 03.5

Yph Cur: 0110.8A
PAGE: 03.6

Bph Cur: 0110.8A
PAGE: 03.7

Neutral: 0010.2A
PAGE: 03.8

Rph Cap: 0022.5A
PAGE: 03.9

Yph Cap: 0022.5A
PAGE: 03.10

Bph Cap: 0022.5A

Per Phase RMS: Submenu:
R-Y Vol: Measured AC Voltage RMS value across R and Y phase.
Y-B Vol: Measured AC Voltage RMS value across Y and B phase.
B-R Vol: Measured AC Voltage RMS value across B and R phase.
Rph Cur: Line current RMS value in R phase. Mains source.
Yph Cur: Line current RMS value in Y phase. Mains source.
Bph Cur: Line current RMS value in B phase. Mains source.
Neutral: Neutral current RMS value.
Rph Cap: Capacitor current RMS value in R phase.
Yph Cap: Capacitor current RMS value in Y phase.
Bph Cap: Capacitor current RMS value in B phase.

- 13 -

PAGE: 04

3.Power
PRESS
PAGE: 04.1

Rph PF:

PAGE: 04.10

1.00

Rph KVA: 0109.7

PAGE: 04.2

Yph PF:

PAGE: 04.11

1.00

Yph KVA: 0109.7

PAGE: 04.3

Bph PF:

PAGE: 04.12

1.00

Bph KVA: 0109.7

PAGE: 04.4

Rph KW:

PAGE: 04.13

0100.2

RphCKVAR: 010.76

PAGE: 04.5

Yph KW:

PAGE: 04.14

0100.2

YphCKVAR: 010.76

PAGE: 04.6

Bph KW:

PAGE: 04.15

0100.2

BphCKVAR: 010.76

PAGE: 04.7

PAGE: 04.16

RphKVAR: 0020.4

Rph mF

PAGE: 04.8

: 165.06

PAGE: 04.17

YphKVAR: 0020.4

Yph mF

PAGE: 04.9

: 165.06

PAGE: 04.18

BphKVAR: 0020.4

Bph mF

: 165.06

Power: Submenu:
Rph PF: Power Factor of R phase on mains source.
Yph PF: Power Factor of Y phase on mains source.
Bph PF: Power Factor of B phase on mains source.
Rph kW: Active Power in kW in R-phase.
Yph kW: Active Power in kW in Y-phase.
Bph kW: Active Power in kW in B-phase.
RphkVAR: Reactive Power in kVAr in R-phase.
YphkVAR: Reactive Power in kVAr in Y-phase.
BphkVAR: Reactive Power in kVAr in B-phase.
Rph KVA: Apparent Power in kVA in R-phase.
Yph KVA: Apparent Power in kVA in Y-phase.
Bph KVA: Apparent Power in kVA in B-phase.
RphCKVAR: Capacitor injected reactive power in R-phase.
YphCKVAR: Capacitor injected reactive power in Y-phase.
BphCKVAR: Capacitor injected reactive power in B-phase.
Rph mF: Capacitor value in micro-farad in R-phase.
Yph mF: Capacitor value in micro-farad in Y-phase.
Bph mF: Capacitor value in micro-farad in B-phase.
- 14 -

PAGE: 05

4.Energy
PRESS
PAGE: 05.1

KWH:

1234567.8

PAGE: 05.2

IndKVARH:12345.6
PAGE: 05.3

CapKVARH:12345.6
PAGE: 05.4

KVAH:

1234567.8

PAGE: 05.5

CKVARH:1234567.8

Energy: Submenu:
KWH: Overall cumulative active energy in kWh on Mains supply.
IndKVARH: Inductive reactive energy in kVArh on Mains supply.
CapKVARH: Capacitive reactive energy in kVArh on Mains supply.
KVAH: Overall cumulative apparent energy in kVA on Mains supply.
CKVARH: Capacitor compensated reactive energy in kVArh.

- 15 -

PAGE: 06

5.Harmonics
PRESS
PAGE: 06.1

Vr-THD-F: 002.4%
PAGE: 06.2

Vy-THD-F: 002.4%
PAGE: 06.3

Vb-THD-F: 002.4%
PAGE: 06.4

Ir-THD-F: 012.5%
PAGE: 06.5

Iy-THD-F: 012.5%
PAGE: 06.6

Ib-THD-F: 012.5%
PAGE: 06.7

In-THD-F: 005.0%
PAGE: 06.8

CCr-THD-F:028.2%
PAGE: 06.9

CCy-THD-F:028.2%
PAGE: 06.10

CCb-THD-F:028.2%

Harmonics: Submenu:
Vr-THD-F/R: R-Y line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Vy-THD-F/R: Y-B line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Vb-THD-F/R: B-R line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Ir-THD-F/R: R phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Iy-THD-F/R: Y phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Ib-THD-F/R: B phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
In-THD-F/R: Neutral current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
CCr-THD-F/R: R phase Capacitor current % Total Harmonic Distortion.
CCy-THD-F/R: Y phase Capacitor current % Total Harmonic Distortion.
CCb-THD-F/R: B phase Capacitor current % Total Harmonic Distortion.

- 16 -

PAGE: 07

6.Step KVAR
PRESS
PAGE: 07.1

Stp1 KVAR:0009.0
PAGE: 07.2

Stp2 KVAR:0009.0
PAGE: 07.3

Stp3 KVAR:0009.0
PAGE: 07.4

Stp4 KVAR:0009.0
PAGE: 07.5

Stp5 KVAR:0009.0
PAGE: 07.6

Stp6 KVAR:0009.0

Step KVAR: Submenu:
Stp1 KVAR: Step 1 kVAr value normalized at Capacitor rated voltage.
Stp2 KVAR: Step 2 kVAr value normalized at Capacitor rated voltage.
Stp3 KVAR: Step 3 kVAr value normalized at Capacitor rated voltage.
Stp4 KVAR: Step 4 kVAr value normalized at Capacitor rated voltage.
Stp5 KVAR: Step 5 kVAr value normalized at Capacitor rated voltage.
Stp6 KVAR: Step 6 kVAr value normalized at Capacitor rated voltage.

- 17 -

PAGE: 08

Time: 10:10:00
Real Time Clock: RTC time set in the SPF-25 is displayed here. Its in
HH:MM:SS format.

PAGE: 09

Date: 07:11:06
Real Time Clock: RTC date set in the SPF-25 is displayed here. Its in
dd:mm:yy format.

PAGE: 10

SPF-25 1.0.6

SPF-25 internal firmware version number is displayed here. (Just for user
information)

Total number of Main display pages are 11nos ranging from “00” to
“10”.

- 18 -

Method for Keyboard/Display usage.

Flow chart for entering into different modes:

PRESS
Enable

Default
Display
mode

If Password
Option is
Enable/Disable.

Disable

Enter Pwd: ****
PRESS
Enter the 4
Digit password
By use of
L, R, UP & DN
Keys.

PRESS

NO

IF
PASSWORD
Correct?

*

YES
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

1.Edit Mode

2.Auto Mode

3.Manual Mode

- 19 -

Parameter Editing Submenu Level 1:

*
1.General
2.System
3.Fault
4.Step
5.Communication

Sub-menu
Level 1
for
Parameter
Editing.

Parameter Editing
Sub-Menu
LEVEL 2

1.General and IO: Parameters related with general function and Input/Output
2. System: Electrical system (Mains supply) related parameters.

3. Fault: Setting Faults and fault levels.
4. Step: Capacitor Steps related parameters.
5. Communication: Parameters related with communication and data logging.

- 20 -

Parameter Editing Method:
(For Submenu Level 2 : L2)

Sub-Menu Level 1.
Cursor Blinking
at Parameter Values.

1.Submenu L2: ****

1.Submenu L2: ****
PRESS

key to increment value.

PRESS

Key to decrement value.

PRESS

Key to shift cursor Left.

PRESS

Key to shift cursor Right.
2.Submenu L2: ****

2.Submenu L2: ****
PRESS

key to increment value.

PRESS

Key to decrement value.

PRESS

Key to shift cursor Left.

PRESS

Key to shift cursor Right.

3.Submenu L2: ****

Exit: No Save

Exit: No Save

Without saving

Default
Display.

With saving

Screen for 1second

Saving In EEProm

Exit: With Save

- 21 -

Parameter Editing Submenu Level 2:
Menu
General

Parameter
Pwd
Ch-Pwd
Ld Def
THD
Rst. Energy

Meaning of Parameter
Password Control
Password value
Load all factory default parameters.
Type of THD factor to be displayed
Energy Counters reset to zero option

Default
Enable
1111
No
F-THD
No

Menu
System

Parameter
Meas. Vol.
Ld. Cur. Pr.
Cap. Cur. Pr.
PF Target
PF Target
Auto Sync
Async Tol.
Reset Async

Meaning of Parameter
Default
SPF-25 rated measurement voltage
440
Primary current value of mains CT
0180
0075
Primary current value of capacitor CT
Target PF for deciding Lag or Lead
Lag
1.00
Target PF exact value
Automatic synchronisation requirement Yes
% load variation tolerence for Auto-sync. 30
No
Reset Auto-sync to default value.

Menu
Fault

Parameter
Over Vol.
Over Vol. Lim
Over Vol. Clr
Under Vol.
Under Vol. Lim
Under Vol. Clr
Over Load
Over Ld. Lim
Over Ld. Clr
Under Ld.
Under Ld. Lim
Under Ld. Clr
Ld. Unbalance
Ld. Unb. Lim
Over CC
Over CC. Lim
Over CC. Clr
Over CC. Rst.
Over CC. Rst.
Under CC.
Under CC. Lim
Under CC. CLr
CC THD
CC THD Lim
CC THD Clr
Step Check
Cap. Cur Tol
Under Comp.
RTC Bat

Meaning of Parameter
Default
Over Voltage Fault: action by PDE-30 Off Step
Over Voltage activation limit value
1.10
Over Voltage resumption limit value 1.05
Under Voltage Fault: Action?
Off Step
Under Voltage activation limit value 0.70
Under Voltage resumption limit value 0.75
Over Load Fault: Action?
Indicate
Mains current over load limit value
1.30
Mains cur. over load resume value
1.25
Under Load on Mains: Action?
Indicate
Under load Activation limit value
0.03
Under load Resumption limit value
0.05
Load Un-balance Fault: Action?
Off Step
Load Un-balance limit
025%
Capacitor Over Current Fault: Action? Disable
Cap. Over Current Limit value.
1.30
Cap. Over Current Resume value.
1.25
Auto reset feature on Cap. Over Cur. No
If Over CC. Rst.=Yes. Time for reset. 120 sec
Under Capacitor current fault: Action? Disable
Under Cap. Cur. Limit value.
0.95
Under Cap. Cur. Resume value.
0.97
Capacitor current Over THD: Action? Disable
Cap.Cur. Over THD limit value.
0.10
Cap.Cur. Over THD resume value.
0.08
Every step kVAr healthiness monitor. Disable
Step kVAr healthiness: tolerence.
0.10
Out of Banks Indication.
Disable
RTC Battery fault monitoring.
Enable

- 22 -

Min
Disable
0000
No
R-THD
No
Min
Non
0001
0001
Lead
0.70Lag
No
01
No

Min

Max
Enable
9999
Yes
F-THD
Yes
Max
Edible
9999
9999
Lag
0.85Lead
Yes
50
Yes

Max

Disable, Indicative, Off Step

0.90
0.85

1.20
1.15

Disable, Indicative, Off Step

0.70
0.75

0.95
1.00

Disable, Indicative, Off Step

1.10
1.05

1.30
1.25

Disable, Indicative, Off Step

0.01
0.02

0.20
0.25

Disable, Indicative, Off Step

005%

100%

Disable, Indicative, Off Step

1.05
1.00
No
15

1.50
1.45
Yes
900

Disable, Indicative, Off Step

0.75
0.80

0.98
1.00

Disable, Indicative, Off Step

0.02
0.01
Disable
0.03
Disable
Disable

0.99
0.90
Enable
0.50
Enable
Enable

Menu
Step

Parameter
No. of Steps
Step Vol
Corr. Time
Discharge Time
Step 1 KVAR
Step 2 KVAR
Step 3 KVAR
Step 4 KVAR
Step 5 KVAR
Step 6 KVAR

Meaning of Parameter
Number of Capacitor steps utilised
Voltage at which kVAr is defined
Correction cycle time.
Capacitor discharge time.
Step 1 kVAr value.
Step 2 kVAr value.
Step 3 kVAr value.
Step 4 kVAr value.
Step 5 kVAr value.
Step 6 kVAr value.

Menu
Parameter
Meaning of Parameter
Communication Unit ID
Communication ID of the unit
Baud Rate
Serial communication baud rate.
Time
RTC time to be set
Date
RTC date to be set
Init RTC
Initialise RTC?
Clear NVRAM Clear all contents on NV RAM?

Default
3
440
120 secs
120 secs
006
009
018
018
018
018

Min
1
380
010
010
001
001
001
001
001
001

Default
3001
09600
--No
No

Min
0000
04800
--No
No

Max
6
660
240
240
250
250
250
250
250
250

Max
9999
38400
--Yes
Yes

Note that all the parameters in the Sub-Menu Level 2 should be carefully filled in the
SPF-25. Failing to put the correct parameters can make SPF-25 to malfunction.
Its therefore advised that a trained person should only be allowed to change these
values.

- 23 -

Commissioning Instructions :
before panel is powered up for the first time.
1. Panel Wiring Check
Ensure that all connections in the panel is tightened properly and there are no
loose connections. Also ensure that the wiring is done as per the wiring
diagram.
2. Power Wiring Check
Ensure that the power cables are connected properly from the Panel I/C to the
feeder I/C or the transformer bushings. The connection has to be after the
Load Feed back CT looking from the Transformer side.
Ensure that the Bus Bars and/or Lugs are clean and free of Dust, Corrosion or
Oxidation on the contact sides so that good electrical connection is maintained.
The surface area should be flat so as to get maximum contact area.
If required Clean the Bus Bars and/ or Lugs by rubbing it with Polish Paper to
remove the oxidation layer. Provide contact paste in between the contacts
surfaces.
Not performing this, can result in to a weaker source point for Capacitor
charging during Step on and this can generate undesirable Noise which can
hamper the performance of equipments installed in the capacitor panel.
3. Load Feed Back CT connection.
Ensure that the load feed back CT connections are done properly. Confirm that
correct phase CT is connected with the correct phase input terminals. (Even
though auto sync is capable of taking care of wrong CT polarities or CT
position interchanging, but then on display, the Phase readings may be seen to
be interchanged. (May be R-phase reading would be seen in B-phase and
vice-versa.
CT connections to be done carefully so as to ensure that the wire does not get
open and there is no loose connection.

Loose connection’s or open CT secondary can result in to very high voltages
getting developed in the circuit which can damage the CT and also produce
high levels of noise in the system.

- 24 -

Fault Finding Guidelines :

Fault Type

Probable Reason

Action to Take

Unit Does not
turn ON. No
display on LCD.

•Input auxiliary supply
not coming.
•Input side fuses
blown

•Check the input
supply to restore
•Check fuses in the
unit for OK.

Unit does not
turn On any
capacitors even
if PF is below
Lower PF limit.

•If auto-sync failure
message is there at
Power On.

• Load may be highly
fluctuating so need of
manual
synchronisation only.
• This is OK
condition.

• The load KW is too
low with Under load
fault enable condition.
•Control connections
from SPF-25 to
contactor coils are not
proper

•Check control supply
and connections from
SPF-25 to contactors.

BF indication on
Default display.

• Internal Ni-Cd
3.2Vdc battery used
for RTC and NV RAM
must be drained down.

• Replace this battery
in consultancy with
TAS trained
personnel.

Some Capacitor
banks are
declared as
faulty even if
they are
checked to be
OK.

•Individual step health
monitoring is enabled
and tolerance limits
set are too stringent.
• Capacitor current
THD factor is
continuously
fluctuating.

•Set the tolerance
limits for individual
steps monitoring as
relaxed.
• With continuously
fluctuating THD of
Capacitor current and
higher level of THD
can cause some
errors in individual
step KVAR
measurement. Under
this condition, best is
to keep this feature
disabled.

- 25 -

Fault Finding Guidelines (continued):

Fault Type

Probable Reason

Action to Take

Serial
Communication
is not working.

• Baud rate selection
is not proper.
• Unit ID is not set
properly.
• Serial
communication cable
connections are not
proper.

• Select proper baud
rate.
• Set the unit ID
correctly.
• Check the serial
cable continuity as
per the connections
given earlier in this
manual.

Data logging is
not taking place.

• Possible that RTC
date is not set
properly.

• Change the battery
by help of TAS’s
authorised person.

SPF-25 resets
occasionally on
turning OFF of
any contactor.

• The contactor supply
phase may be the
same as used for SPF25 auxiliary supply.
• RC snubbers/ free
wheeling diodes are
not put with contactor
coils.

• Use the different
phase for control
supply of contactors
and for SPF-25 supply
• Usage of RC
snubbers / free
wheeling diodes is
mandatory.

- 26 -

Corporate Office/Works/Design Centre:
W-61, MIDC, Ambad, Nasik - 422010, Maharashtra (India)
Tel: +91-(253)-2384038 / 2381090
Email: [email protected]
Marketing and After-Sales Service:
A/58, Kamal Pushpa, K.C. Road, Bandra, Mumbai-400050.
Tel: +91-9930513923
Email: [email protected]
Regional Office: Delhi
191-B, Ground Floor, Padam Nagar (Filter Market),
New Delhi - 110007 (India).
Tel: +91-9911615701
Email: [email protected]


Slide 28

Operations Manual
SPF-25/6
AUTOMATIC POWER FACTOR
CONTROLLER

TAS Powertek Pvt. Ltd.
Corporate Office:
W-61, MIDC, Ambad, Nasik - 422010, Maharashtra (India)
Tel: +91-(253)-2384038 / 2381090
Email: [email protected]

NOTE
These instructions do not purport to cover all details or
variations in equipment, nor to provide for every possible
contingency to be met in connection with installation,
operation or maintenance.

Should further information be desired or should particular
problems arise which are not covered sufficiently for the
purchasers purposes, the matter should be referred to our
TAS Powertek Pvt. Ltd., office.
The contents of this instruction Manual shall not become
part of or modify any prior or existing agreement or
relationship. The sales contract contains the entire
obligations of TAS Powertek Pvt. Ltd. The warranty
contained in the contract between the parties is the sole
warranty of TAS Powertek Pvt. Ltd. Any statements
contained herein do not create new warranties or modify the
existing warranty.

The reproduction, transmission or use of this
document or its contents is not permitted
without express written authority. Offenders
will be liable for damages. All rights are
reserved.

Index
Index Page
-----------------Features & Specifications
----------Mechanical Dimensions/ mounting --------Functional Block diagram
-----------------PF correction technique
-----------------Back Side terminals
-----------------------Typical wiring scheme ---------------------Front Facia
---------------------------------Communication connector connections ----Display of various parameters / Status ---Method of Keyboard/Display usage -------Parameter Submenu -----------------------Commissioning Instruction (before Powerup)
Fault finding Guidelines ---------------------

-1-

1
2
3
4
5
6
7
8
9
10
19
22
24
25

Features:
• Totally Micro-processor controlled Digital Signal processing
logic for measurements.
• All measurements with 1.0 class accuracy.
• Automatic Synchronisation capable of giving the correct
results for wrong connections at CT terminals (even wrong
polarity of CTs).
• Measurement and kVAr compensation are frequency / THD
compensated.
• Load V,Iph, In and Cap. current THD measurement.
• Up-to 6 output banks control.
• Capable of doing the kVAr measurements on basis of mean
of the correction cycle time and provide kVAr compensation.
• Standard 144 X 144 cabinet for panel door flush mounting.
• Serial communication through standard TAS protocols.
• Manual testing mode for user checking of the Capacitor steps
switching.
• Protections provided (user settable):
Over/under Voltage
Cap. Over/under current / THD.
Over/Under frequency (internally set limits)
Over / Under load.
Load unbalance.
Capacitor individual step kVAr monitoring.
Out of steps: Under-compensation (only for indication)
NV-RAM battery down.
• Data logging for various parameters for 2months period at an
interval of 1hr.
• Unit comes along with PC (Windows compatible) software
for downloading and viewing the logged data.

Specifications:
•
•
•
•
•
•
•
•
•
•
•
•

Feed-back Voltage:440Volt (+10%/-30%)
Current input : 1Amp for load and capacitor feed-back.
Measurement Accuracy: Class 1.0
Auxiliary Supply: 525Vac to 300Vac.
Correction / Discharge time:
Selectable in seconds from 10sec. to 240sec.
Output commands:
NO contacts each with current rating of 0.5Amp AC. at
240Vac.
RS-232 baud rate selectable from 4.8kBPS to 38.4kBPS.
Operating temperature: 0 to 55oC.
1.0class measurement Operating temperature: 0 to 50oC.
Storage temperature: -10 to +75oC.
Humidity: 0 to 98%.
Supply frequency: 45Hz to 55Hz.

-2-

Mechanical Dimensions:
135

144

135

120
144

6

Recommended size for cutout on panel door is 138 X 138.
All Dimensions given are in mm.

Maximum weight: (with clamps and terminals) = 2.5kg.

-3-

Functional Block Diagram:
3 channel
Current f.b.

3
Channel
Cap.
Current
f.b.

3 channel
Voltage f.b.

SPF-25

V, I, PF and Power
Measurement
Block
For every AC mains
Cycle.

Calculation
Block for
• Energy Parameters
• Harmonic analysis

EEPROM
For Data
Logging

Keyboard,
Display and
Other support
Functions
Block.

RS-232 Serial
Communication.
TAS-01
Protocol stack.

Power Factor
Correction Block
+ event monitoring.

Outputs Commands
For Capacitor
Switching.

Power Supply
Block.

Above block diagram gives the functional blocks that are built into SPF-25 PF
correction relay.
These blocks are made up with the combination of functions from hardware and
corresponding firmware that resides in the Program memory of the micro-processor
used therein.
Even though the basic blocks exists as shown in the diagram, there functionality is
interdependent. The entire combination is carefully designed so as to have
minimum effects of Electrical and Electromagnetic noise level on the functionality of
this SPF-25.
The firmware written takes into various error handling eventualities so that the
functioning of this PF relay is error free and highly reliable.

-4-

PF correction technique:
KVAr Inductive

Target
PF.
Cos Φ
= PF

1.5 X kVAr
Of Smallest
Capacitor bank

KW

No change band.
KVAr Capacitive
Capacitor Addition band.
Capacitor Removal band.
SPF-25 for kVAr compensation works with the kW v/s kVAr diagram as shown here
above.
A band is created across the target PF value. (Target PF is set by user). This band
is of +0.75 of the smallest capacitor bank kVAr. Thus, total band width is always 1.5
times the smallest capacitor bank kVAr used. This is a no change band. If the
mains source parameters are within this band, SPF-25 would not change the
capacitors bank status.
If the mains parameters are out of this “No change band”, then SPF-25 calculates
the correct capacitor bank combination to be added / subtracted and within one
correction cycle brings it within the No change band.
The no change band width is selected as mentioned because it has to prevent unnecessary hunting (switching on/off) of the capacitor banks.

-5-

Back Side terminals:

Voltage
Feed-Back

Auxiliary
Supply

Current
Feed-Back
Output commands.

-6-

Capacitor
Current
Feed-Back

Typical Wiring with SPF-25 PF correction system.
L
O
A
D

L
C
R
+

L
C
R
-

L
C
Y
+

L
C
Y
-

L
C
B
+

L
C
B
-

PH 3
PH 2
PH 1
CCR+
CCRCCY+
CCYCCB+
CCB-

S
P
F
2
5

Auxiliary
Supply

L1
L2

Com
C01
C02
|

C06

Mains Connections:
Phase 1 control:
Neutral control:
Commands:
Load Current CT:
Capacitor Current CT:

-7-

Front Facia of SPF-25:
LCD Display

Step status LED indication
Serial Communication Port

Membrane Keypad

Usage of the UP and DN key makes the LCD display to scroll up
and down. This is used for display of various status as well as for
viewing the On line measured electrical values.
These keys are also used for changing values in Parameters
Editing mode and used for status changing of banks in Manual
mode.
Usage of ENT key is for entering the submenu and / or for setting
up some values.
The L and R keys are used in changing the position of the cursor
from Left to Right and vice-versa.

-8-

RS-232 serial communication 9 pin D connector:

5

4

6

3

7

2

8

1

9
RXD

GND

TXD

RS-232 cable connection Details:

PIN
NO

PC side
Connection

CONNECTION

SPF-25

1

NC

2

RXD

TXD

3

TXD

RXD

GND

GND

4
5
6
7
8
9

NC

-9-

Display of Various Parameters / Status:
PAGE: 00

COSΦ= -0.99 A OK

This is default display screen giving
information on PF, mode and
working status.

COSΦ= -0.99 :This part of the display indicates the Power Factor running value. The
sign –ve indicates that PF is Capacitive and no sign (+ve) indicates that PF is Inductive.
The PF indicated is the overall PF of the three phase system.
A or M :
This part either indicates the letter “A” or letter “M”. The letter A means
that SPF-25 is working in Auto mode.
The letter M means that SPF-25 is presently in Manual mode.
The Auto or Manual modes can be selected by pressing ENT key on this page.
(If Password option is enabled, enter the same by using UP/DN/L/R keys and then
Pressing ENT)
Then by UP or DN key you can stroll between the displays:
“1. Edit Mode”, “2. Auto Mode”, “3.Manual Mode”.
The first one “1.Edit Mode” is for parameter changing. The details of parameter changing
are explained in detail in later part of this manual.
The second and third one as display indicates are for selecting Auto or Manual mode
respectively. The ENT key pressed on selecting the mode desired, puts the SPF-25 into
that mode.
Auto Mode: In this mode SPF-25 works in automatic mode. It switches the capacitor
banks automatically depending on the parameter setting of target PF. This mode is the
default mode and is to be used for unmanned operation of the system controlled by
SPF-25.
Manual Mode: This mode is activated for checking/testing the capacitor banks switching.
Its also used for changing the Masking status of the capacitor banks. More on this is
explained later. (On Page 01 explanation)
OK or ** :
The last part of the display that is blinking every 500mS indicates the
working status of SPF-25. “OK” indicates that unit is working fine without any trip
conditions. If there is other indication, the meaning of the same can be as:
OK
:
No Fault
OC
:
Over Capacitor Current
UC
:
Under Capacitor Current
OL
:
Over Load
UL
:
Under Load
OV
:
Over Voltage
UV
:
Under Voltage
OF
:
Over Frequency
UF
:
Under Frequency
OH
:
Over Capacitor Current THD %.
OB
:
Out of Banks
LU
:
Load Unbalance
BF
:
Battery Failure (RTC)
NV
:
NVRAM Checksum Error
VA
:
Voltage Absent
- 10 -

PAGE: 01

PAGE: 01

______

AUTO

______

MAN

This display indicates the Bank status in Auto mode and in Manual mode it helps
to make the specific bank On or Off or declare masked.
: Means Bank is On.
: Means Bank is Off.
: Means Bank is Off and is declared masked (out of action)
: Means Bank does not exist for compensation.
When the Page 01 is in Auto mode, its only for indication of Bank status.
But in Manual mode, the “ENT” key press activates the manual control
mode. The cursor over the bank number starts blinking. The UP and DN
keys can turn On and Off the respective bank.
The DN key pressed puts the respective bank in Masking mode and another
press of DN key brings it out of Masking mode.

Putting the bank masking status permanently:
If a bank is to be permanently put in masked mode or is to be brought out of
permanent masked mode, it can be done by bringing the blinking cursor on
the position of the respective bank by use of L or R key. Then by pressing
DN key, bring the status of the bank to the required level (Masked or
Unmasked). Then press ENT key so that cursor stops blinking. After that by
pressing UP key go to Page 00. Then Press ENT. (If Password option is
enabled, enter the same by using UP/DN/L/R keys and then Press ENT)
“1.EDIT MODE” would be displayed. Press ENT one more time. “1.General
and IO” would be displayed. Press ENT again. “Pwd : Disable” or “Pwd :
Enable” would be displayed. Press UP key. “Exit: No Save” would be
displayed. Press ENT so that cursor will start blinking. Press UP. “Exit: With
Save” would be displayed with cursor blinking. Press ENT. “Saving in
EEPROM” would be displayed for a short time and then Page 00 would be
displayed.
You will observe that the bank status as requirement is changed
permanently to the status desired.

- 11 -

PAGE: 02

1.Overall Values
PRESS
PAGE: 02.1

Avg Vol: 415.7 V
PAGE: 02.2

Avg Cur: 0123.4A
PAGE: 02.3

Tot KW:

0081.2

PAGE: 02.4

TotKVAR: 0024.6
PAGE: 02.5

Tot KVA: 0101.1
PAGE: 02.6

Avg CC:

0031.3A

PAGE: 02.7

CKVAR:

028.35

PAGE: 02.8

LS PF:

0.82

PAGE: 02.9

LS KVAR: 0043.9
PAGE: 02.10

LS KVA:

0125.7

PAGE: 02.11

Freq:

49.9Hz

The Overall values Display menu has submenus as displayed above. As its
self explanatory it means:
Avg Vol: Average voltage of all the three line to line voltage values.
Avg Cur: Average current of all the three phase line current values.
Tot KW: Overall kW of the three phase system measured at source.
TotKVAR: Overall kVAr of the three phase system measured at source.
Tot KVA: Overall kVA of the three phase system measured at source.
Avg CC: Average of three phase current through capacitor panel.
CKVAR: Capacitive kVAr that is compensated by the system.
LS PF: Load side PF. (PF value if not compensated.
LS KVAR: Load side kVAr.
LS KVA: Load side kVA.
Freq: Supply frequency in Hz.
- 12 -

PAGE: 03

2.Per-Phase RMS

PRESS
PAGE: 03.1

R-Y Vol: 415.7 V
PAGE: 03.2

Y-B Vol: 415.7 V
PAGE: 03.3

B-R Vol: 415.7 V
PAGE: 03.4

Rph Cur: 0110.8A
PAGE: 03.5

Yph Cur: 0110.8A
PAGE: 03.6

Bph Cur: 0110.8A
PAGE: 03.7

Neutral: 0010.2A
PAGE: 03.8

Rph Cap: 0022.5A
PAGE: 03.9

Yph Cap: 0022.5A
PAGE: 03.10

Bph Cap: 0022.5A

Per Phase RMS: Submenu:
R-Y Vol: Measured AC Voltage RMS value across R and Y phase.
Y-B Vol: Measured AC Voltage RMS value across Y and B phase.
B-R Vol: Measured AC Voltage RMS value across B and R phase.
Rph Cur: Line current RMS value in R phase. Mains source.
Yph Cur: Line current RMS value in Y phase. Mains source.
Bph Cur: Line current RMS value in B phase. Mains source.
Neutral: Neutral current RMS value.
Rph Cap: Capacitor current RMS value in R phase.
Yph Cap: Capacitor current RMS value in Y phase.
Bph Cap: Capacitor current RMS value in B phase.

- 13 -

PAGE: 04

3.Power
PRESS
PAGE: 04.1

Rph PF:

PAGE: 04.10

1.00

Rph KVA: 0109.7

PAGE: 04.2

Yph PF:

PAGE: 04.11

1.00

Yph KVA: 0109.7

PAGE: 04.3

Bph PF:

PAGE: 04.12

1.00

Bph KVA: 0109.7

PAGE: 04.4

Rph KW:

PAGE: 04.13

0100.2

RphCKVAR: 010.76

PAGE: 04.5

Yph KW:

PAGE: 04.14

0100.2

YphCKVAR: 010.76

PAGE: 04.6

Bph KW:

PAGE: 04.15

0100.2

BphCKVAR: 010.76

PAGE: 04.7

PAGE: 04.16

RphKVAR: 0020.4

Rph mF

PAGE: 04.8

: 165.06

PAGE: 04.17

YphKVAR: 0020.4

Yph mF

PAGE: 04.9

: 165.06

PAGE: 04.18

BphKVAR: 0020.4

Bph mF

: 165.06

Power: Submenu:
Rph PF: Power Factor of R phase on mains source.
Yph PF: Power Factor of Y phase on mains source.
Bph PF: Power Factor of B phase on mains source.
Rph kW: Active Power in kW in R-phase.
Yph kW: Active Power in kW in Y-phase.
Bph kW: Active Power in kW in B-phase.
RphkVAR: Reactive Power in kVAr in R-phase.
YphkVAR: Reactive Power in kVAr in Y-phase.
BphkVAR: Reactive Power in kVAr in B-phase.
Rph KVA: Apparent Power in kVA in R-phase.
Yph KVA: Apparent Power in kVA in Y-phase.
Bph KVA: Apparent Power in kVA in B-phase.
RphCKVAR: Capacitor injected reactive power in R-phase.
YphCKVAR: Capacitor injected reactive power in Y-phase.
BphCKVAR: Capacitor injected reactive power in B-phase.
Rph mF: Capacitor value in micro-farad in R-phase.
Yph mF: Capacitor value in micro-farad in Y-phase.
Bph mF: Capacitor value in micro-farad in B-phase.
- 14 -

PAGE: 05

4.Energy
PRESS
PAGE: 05.1

KWH:

1234567.8

PAGE: 05.2

IndKVARH:12345.6
PAGE: 05.3

CapKVARH:12345.6
PAGE: 05.4

KVAH:

1234567.8

PAGE: 05.5

CKVARH:1234567.8

Energy: Submenu:
KWH: Overall cumulative active energy in kWh on Mains supply.
IndKVARH: Inductive reactive energy in kVArh on Mains supply.
CapKVARH: Capacitive reactive energy in kVArh on Mains supply.
KVAH: Overall cumulative apparent energy in kVA on Mains supply.
CKVARH: Capacitor compensated reactive energy in kVArh.

- 15 -

PAGE: 06

5.Harmonics
PRESS
PAGE: 06.1

Vr-THD-F: 002.4%
PAGE: 06.2

Vy-THD-F: 002.4%
PAGE: 06.3

Vb-THD-F: 002.4%
PAGE: 06.4

Ir-THD-F: 012.5%
PAGE: 06.5

Iy-THD-F: 012.5%
PAGE: 06.6

Ib-THD-F: 012.5%
PAGE: 06.7

In-THD-F: 005.0%
PAGE: 06.8

CCr-THD-F:028.2%
PAGE: 06.9

CCy-THD-F:028.2%
PAGE: 06.10

CCb-THD-F:028.2%

Harmonics: Submenu:
Vr-THD-F/R: R-Y line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Vy-THD-F/R: Y-B line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Vb-THD-F/R: B-R line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Ir-THD-F/R: R phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Iy-THD-F/R: Y phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Ib-THD-F/R: B phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
In-THD-F/R: Neutral current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
CCr-THD-F/R: R phase Capacitor current % Total Harmonic Distortion.
CCy-THD-F/R: Y phase Capacitor current % Total Harmonic Distortion.
CCb-THD-F/R: B phase Capacitor current % Total Harmonic Distortion.

- 16 -

PAGE: 07

6.Step KVAR
PRESS
PAGE: 07.1

Stp1 KVAR:0009.0
PAGE: 07.2

Stp2 KVAR:0009.0
PAGE: 07.3

Stp3 KVAR:0009.0
PAGE: 07.4

Stp4 KVAR:0009.0
PAGE: 07.5

Stp5 KVAR:0009.0
PAGE: 07.6

Stp6 KVAR:0009.0

Step KVAR: Submenu:
Stp1 KVAR: Step 1 kVAr value normalized at Capacitor rated voltage.
Stp2 KVAR: Step 2 kVAr value normalized at Capacitor rated voltage.
Stp3 KVAR: Step 3 kVAr value normalized at Capacitor rated voltage.
Stp4 KVAR: Step 4 kVAr value normalized at Capacitor rated voltage.
Stp5 KVAR: Step 5 kVAr value normalized at Capacitor rated voltage.
Stp6 KVAR: Step 6 kVAr value normalized at Capacitor rated voltage.

- 17 -

PAGE: 08

Time: 10:10:00
Real Time Clock: RTC time set in the SPF-25 is displayed here. Its in
HH:MM:SS format.

PAGE: 09

Date: 07:11:06
Real Time Clock: RTC date set in the SPF-25 is displayed here. Its in
dd:mm:yy format.

PAGE: 10

SPF-25 1.0.6

SPF-25 internal firmware version number is displayed here. (Just for user
information)

Total number of Main display pages are 11nos ranging from “00” to
“10”.

- 18 -

Method for Keyboard/Display usage.

Flow chart for entering into different modes:

PRESS
Enable

Default
Display
mode

If Password
Option is
Enable/Disable.

Disable

Enter Pwd: ****
PRESS
Enter the 4
Digit password
By use of
L, R, UP & DN
Keys.

PRESS

NO

IF
PASSWORD
Correct?

*

YES
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

1.Edit Mode

2.Auto Mode

3.Manual Mode

- 19 -

Parameter Editing Submenu Level 1:

*
1.General
2.System
3.Fault
4.Step
5.Communication

Sub-menu
Level 1
for
Parameter
Editing.

Parameter Editing
Sub-Menu
LEVEL 2

1.General and IO: Parameters related with general function and Input/Output
2. System: Electrical system (Mains supply) related parameters.

3. Fault: Setting Faults and fault levels.
4. Step: Capacitor Steps related parameters.
5. Communication: Parameters related with communication and data logging.

- 20 -

Parameter Editing Method:
(For Submenu Level 2 : L2)

Sub-Menu Level 1.
Cursor Blinking
at Parameter Values.

1.Submenu L2: ****

1.Submenu L2: ****
PRESS

key to increment value.

PRESS

Key to decrement value.

PRESS

Key to shift cursor Left.

PRESS

Key to shift cursor Right.
2.Submenu L2: ****

2.Submenu L2: ****
PRESS

key to increment value.

PRESS

Key to decrement value.

PRESS

Key to shift cursor Left.

PRESS

Key to shift cursor Right.

3.Submenu L2: ****

Exit: No Save

Exit: No Save

Without saving

Default
Display.

With saving

Screen for 1second

Saving In EEProm

Exit: With Save

- 21 -

Parameter Editing Submenu Level 2:
Menu
General

Parameter
Pwd
Ch-Pwd
Ld Def
THD
Rst. Energy

Meaning of Parameter
Password Control
Password value
Load all factory default parameters.
Type of THD factor to be displayed
Energy Counters reset to zero option

Default
Enable
1111
No
F-THD
No

Menu
System

Parameter
Meas. Vol.
Ld. Cur. Pr.
Cap. Cur. Pr.
PF Target
PF Target
Auto Sync
Async Tol.
Reset Async

Meaning of Parameter
Default
SPF-25 rated measurement voltage
440
Primary current value of mains CT
0180
0075
Primary current value of capacitor CT
Target PF for deciding Lag or Lead
Lag
1.00
Target PF exact value
Automatic synchronisation requirement Yes
% load variation tolerence for Auto-sync. 30
No
Reset Auto-sync to default value.

Menu
Fault

Parameter
Over Vol.
Over Vol. Lim
Over Vol. Clr
Under Vol.
Under Vol. Lim
Under Vol. Clr
Over Load
Over Ld. Lim
Over Ld. Clr
Under Ld.
Under Ld. Lim
Under Ld. Clr
Ld. Unbalance
Ld. Unb. Lim
Over CC
Over CC. Lim
Over CC. Clr
Over CC. Rst.
Over CC. Rst.
Under CC.
Under CC. Lim
Under CC. CLr
CC THD
CC THD Lim
CC THD Clr
Step Check
Cap. Cur Tol
Under Comp.
RTC Bat

Meaning of Parameter
Default
Over Voltage Fault: action by PDE-30 Off Step
Over Voltage activation limit value
1.10
Over Voltage resumption limit value 1.05
Under Voltage Fault: Action?
Off Step
Under Voltage activation limit value 0.70
Under Voltage resumption limit value 0.75
Over Load Fault: Action?
Indicate
Mains current over load limit value
1.30
Mains cur. over load resume value
1.25
Under Load on Mains: Action?
Indicate
Under load Activation limit value
0.03
Under load Resumption limit value
0.05
Load Un-balance Fault: Action?
Off Step
Load Un-balance limit
025%
Capacitor Over Current Fault: Action? Disable
Cap. Over Current Limit value.
1.30
Cap. Over Current Resume value.
1.25
Auto reset feature on Cap. Over Cur. No
If Over CC. Rst.=Yes. Time for reset. 120 sec
Under Capacitor current fault: Action? Disable
Under Cap. Cur. Limit value.
0.95
Under Cap. Cur. Resume value.
0.97
Capacitor current Over THD: Action? Disable
Cap.Cur. Over THD limit value.
0.10
Cap.Cur. Over THD resume value.
0.08
Every step kVAr healthiness monitor. Disable
Step kVAr healthiness: tolerence.
0.10
Out of Banks Indication.
Disable
RTC Battery fault monitoring.
Enable

- 22 -

Min
Disable
0000
No
R-THD
No
Min
Non
0001
0001
Lead
0.70Lag
No
01
No

Min

Max
Enable
9999
Yes
F-THD
Yes
Max
Edible
9999
9999
Lag
0.85Lead
Yes
50
Yes

Max

Disable, Indicative, Off Step

0.90
0.85

1.20
1.15

Disable, Indicative, Off Step

0.70
0.75

0.95
1.00

Disable, Indicative, Off Step

1.10
1.05

1.30
1.25

Disable, Indicative, Off Step

0.01
0.02

0.20
0.25

Disable, Indicative, Off Step

005%

100%

Disable, Indicative, Off Step

1.05
1.00
No
15

1.50
1.45
Yes
900

Disable, Indicative, Off Step

0.75
0.80

0.98
1.00

Disable, Indicative, Off Step

0.02
0.01
Disable
0.03
Disable
Disable

0.99
0.90
Enable
0.50
Enable
Enable

Menu
Step

Parameter
No. of Steps
Step Vol
Corr. Time
Discharge Time
Step 1 KVAR
Step 2 KVAR
Step 3 KVAR
Step 4 KVAR
Step 5 KVAR
Step 6 KVAR

Meaning of Parameter
Number of Capacitor steps utilised
Voltage at which kVAr is defined
Correction cycle time.
Capacitor discharge time.
Step 1 kVAr value.
Step 2 kVAr value.
Step 3 kVAr value.
Step 4 kVAr value.
Step 5 kVAr value.
Step 6 kVAr value.

Menu
Parameter
Meaning of Parameter
Communication Unit ID
Communication ID of the unit
Baud Rate
Serial communication baud rate.
Time
RTC time to be set
Date
RTC date to be set
Init RTC
Initialise RTC?
Clear NVRAM Clear all contents on NV RAM?

Default
3
440
120 secs
120 secs
006
009
018
018
018
018

Min
1
380
010
010
001
001
001
001
001
001

Default
3001
09600
--No
No

Min
0000
04800
--No
No

Max
6
660
240
240
250
250
250
250
250
250

Max
9999
38400
--Yes
Yes

Note that all the parameters in the Sub-Menu Level 2 should be carefully filled in the
SPF-25. Failing to put the correct parameters can make SPF-25 to malfunction.
Its therefore advised that a trained person should only be allowed to change these
values.

- 23 -

Commissioning Instructions :
before panel is powered up for the first time.
1. Panel Wiring Check
Ensure that all connections in the panel is tightened properly and there are no
loose connections. Also ensure that the wiring is done as per the wiring
diagram.
2. Power Wiring Check
Ensure that the power cables are connected properly from the Panel I/C to the
feeder I/C or the transformer bushings. The connection has to be after the
Load Feed back CT looking from the Transformer side.
Ensure that the Bus Bars and/or Lugs are clean and free of Dust, Corrosion or
Oxidation on the contact sides so that good electrical connection is maintained.
The surface area should be flat so as to get maximum contact area.
If required Clean the Bus Bars and/ or Lugs by rubbing it with Polish Paper to
remove the oxidation layer. Provide contact paste in between the contacts
surfaces.
Not performing this, can result in to a weaker source point for Capacitor
charging during Step on and this can generate undesirable Noise which can
hamper the performance of equipments installed in the capacitor panel.
3. Load Feed Back CT connection.
Ensure that the load feed back CT connections are done properly. Confirm that
correct phase CT is connected with the correct phase input terminals. (Even
though auto sync is capable of taking care of wrong CT polarities or CT
position interchanging, but then on display, the Phase readings may be seen to
be interchanged. (May be R-phase reading would be seen in B-phase and
vice-versa.
CT connections to be done carefully so as to ensure that the wire does not get
open and there is no loose connection.

Loose connection’s or open CT secondary can result in to very high voltages
getting developed in the circuit which can damage the CT and also produce
high levels of noise in the system.

- 24 -

Fault Finding Guidelines :

Fault Type

Probable Reason

Action to Take

Unit Does not
turn ON. No
display on LCD.

•Input auxiliary supply
not coming.
•Input side fuses
blown

•Check the input
supply to restore
•Check fuses in the
unit for OK.

Unit does not
turn On any
capacitors even
if PF is below
Lower PF limit.

•If auto-sync failure
message is there at
Power On.

• Load may be highly
fluctuating so need of
manual
synchronisation only.
• This is OK
condition.

• The load KW is too
low with Under load
fault enable condition.
•Control connections
from SPF-25 to
contactor coils are not
proper

•Check control supply
and connections from
SPF-25 to contactors.

BF indication on
Default display.

• Internal Ni-Cd
3.2Vdc battery used
for RTC and NV RAM
must be drained down.

• Replace this battery
in consultancy with
TAS trained
personnel.

Some Capacitor
banks are
declared as
faulty even if
they are
checked to be
OK.

•Individual step health
monitoring is enabled
and tolerance limits
set are too stringent.
• Capacitor current
THD factor is
continuously
fluctuating.

•Set the tolerance
limits for individual
steps monitoring as
relaxed.
• With continuously
fluctuating THD of
Capacitor current and
higher level of THD
can cause some
errors in individual
step KVAR
measurement. Under
this condition, best is
to keep this feature
disabled.

- 25 -

Fault Finding Guidelines (continued):

Fault Type

Probable Reason

Action to Take

Serial
Communication
is not working.

• Baud rate selection
is not proper.
• Unit ID is not set
properly.
• Serial
communication cable
connections are not
proper.

• Select proper baud
rate.
• Set the unit ID
correctly.
• Check the serial
cable continuity as
per the connections
given earlier in this
manual.

Data logging is
not taking place.

• Possible that RTC
date is not set
properly.

• Change the battery
by help of TAS’s
authorised person.

SPF-25 resets
occasionally on
turning OFF of
any contactor.

• The contactor supply
phase may be the
same as used for SPF25 auxiliary supply.
• RC snubbers/ free
wheeling diodes are
not put with contactor
coils.

• Use the different
phase for control
supply of contactors
and for SPF-25 supply
• Usage of RC
snubbers / free
wheeling diodes is
mandatory.

- 26 -

Corporate Office/Works/Design Centre:
W-61, MIDC, Ambad, Nasik - 422010, Maharashtra (India)
Tel: +91-(253)-2384038 / 2381090
Email: [email protected]
Marketing and After-Sales Service:
A/58, Kamal Pushpa, K.C. Road, Bandra, Mumbai-400050.
Tel: +91-9930513923
Email: [email protected]
Regional Office: Delhi
191-B, Ground Floor, Padam Nagar (Filter Market),
New Delhi - 110007 (India).
Tel: +91-9911615701
Email: [email protected]


Slide 29

Operations Manual
SPF-25/6
AUTOMATIC POWER FACTOR
CONTROLLER

TAS Powertek Pvt. Ltd.
Corporate Office:
W-61, MIDC, Ambad, Nasik - 422010, Maharashtra (India)
Tel: +91-(253)-2384038 / 2381090
Email: [email protected]

NOTE
These instructions do not purport to cover all details or
variations in equipment, nor to provide for every possible
contingency to be met in connection with installation,
operation or maintenance.

Should further information be desired or should particular
problems arise which are not covered sufficiently for the
purchasers purposes, the matter should be referred to our
TAS Powertek Pvt. Ltd., office.
The contents of this instruction Manual shall not become
part of or modify any prior or existing agreement or
relationship. The sales contract contains the entire
obligations of TAS Powertek Pvt. Ltd. The warranty
contained in the contract between the parties is the sole
warranty of TAS Powertek Pvt. Ltd. Any statements
contained herein do not create new warranties or modify the
existing warranty.

The reproduction, transmission or use of this
document or its contents is not permitted
without express written authority. Offenders
will be liable for damages. All rights are
reserved.

Index
Index Page
-----------------Features & Specifications
----------Mechanical Dimensions/ mounting --------Functional Block diagram
-----------------PF correction technique
-----------------Back Side terminals
-----------------------Typical wiring scheme ---------------------Front Facia
---------------------------------Communication connector connections ----Display of various parameters / Status ---Method of Keyboard/Display usage -------Parameter Submenu -----------------------Commissioning Instruction (before Powerup)
Fault finding Guidelines ---------------------

-1-

1
2
3
4
5
6
7
8
9
10
19
22
24
25

Features:
• Totally Micro-processor controlled Digital Signal processing
logic for measurements.
• All measurements with 1.0 class accuracy.
• Automatic Synchronisation capable of giving the correct
results for wrong connections at CT terminals (even wrong
polarity of CTs).
• Measurement and kVAr compensation are frequency / THD
compensated.
• Load V,Iph, In and Cap. current THD measurement.
• Up-to 6 output banks control.
• Capable of doing the kVAr measurements on basis of mean
of the correction cycle time and provide kVAr compensation.
• Standard 144 X 144 cabinet for panel door flush mounting.
• Serial communication through standard TAS protocols.
• Manual testing mode for user checking of the Capacitor steps
switching.
• Protections provided (user settable):
Over/under Voltage
Cap. Over/under current / THD.
Over/Under frequency (internally set limits)
Over / Under load.
Load unbalance.
Capacitor individual step kVAr monitoring.
Out of steps: Under-compensation (only for indication)
NV-RAM battery down.
• Data logging for various parameters for 2months period at an
interval of 1hr.
• Unit comes along with PC (Windows compatible) software
for downloading and viewing the logged data.

Specifications:
•
•
•
•
•
•
•
•
•
•
•
•

Feed-back Voltage:440Volt (+10%/-30%)
Current input : 1Amp for load and capacitor feed-back.
Measurement Accuracy: Class 1.0
Auxiliary Supply: 525Vac to 300Vac.
Correction / Discharge time:
Selectable in seconds from 10sec. to 240sec.
Output commands:
NO contacts each with current rating of 0.5Amp AC. at
240Vac.
RS-232 baud rate selectable from 4.8kBPS to 38.4kBPS.
Operating temperature: 0 to 55oC.
1.0class measurement Operating temperature: 0 to 50oC.
Storage temperature: -10 to +75oC.
Humidity: 0 to 98%.
Supply frequency: 45Hz to 55Hz.

-2-

Mechanical Dimensions:
135

144

135

120
144

6

Recommended size for cutout on panel door is 138 X 138.
All Dimensions given are in mm.

Maximum weight: (with clamps and terminals) = 2.5kg.

-3-

Functional Block Diagram:
3 channel
Current f.b.

3
Channel
Cap.
Current
f.b.

3 channel
Voltage f.b.

SPF-25

V, I, PF and Power
Measurement
Block
For every AC mains
Cycle.

Calculation
Block for
• Energy Parameters
• Harmonic analysis

EEPROM
For Data
Logging

Keyboard,
Display and
Other support
Functions
Block.

RS-232 Serial
Communication.
TAS-01
Protocol stack.

Power Factor
Correction Block
+ event monitoring.

Outputs Commands
For Capacitor
Switching.

Power Supply
Block.

Above block diagram gives the functional blocks that are built into SPF-25 PF
correction relay.
These blocks are made up with the combination of functions from hardware and
corresponding firmware that resides in the Program memory of the micro-processor
used therein.
Even though the basic blocks exists as shown in the diagram, there functionality is
interdependent. The entire combination is carefully designed so as to have
minimum effects of Electrical and Electromagnetic noise level on the functionality of
this SPF-25.
The firmware written takes into various error handling eventualities so that the
functioning of this PF relay is error free and highly reliable.

-4-

PF correction technique:
KVAr Inductive

Target
PF.
Cos Φ
= PF

1.5 X kVAr
Of Smallest
Capacitor bank

KW

No change band.
KVAr Capacitive
Capacitor Addition band.
Capacitor Removal band.
SPF-25 for kVAr compensation works with the kW v/s kVAr diagram as shown here
above.
A band is created across the target PF value. (Target PF is set by user). This band
is of +0.75 of the smallest capacitor bank kVAr. Thus, total band width is always 1.5
times the smallest capacitor bank kVAr used. This is a no change band. If the
mains source parameters are within this band, SPF-25 would not change the
capacitors bank status.
If the mains parameters are out of this “No change band”, then SPF-25 calculates
the correct capacitor bank combination to be added / subtracted and within one
correction cycle brings it within the No change band.
The no change band width is selected as mentioned because it has to prevent unnecessary hunting (switching on/off) of the capacitor banks.

-5-

Back Side terminals:

Voltage
Feed-Back

Auxiliary
Supply

Current
Feed-Back
Output commands.

-6-

Capacitor
Current
Feed-Back

Typical Wiring with SPF-25 PF correction system.
L
O
A
D

L
C
R
+

L
C
R
-

L
C
Y
+

L
C
Y
-

L
C
B
+

L
C
B
-

PH 3
PH 2
PH 1
CCR+
CCRCCY+
CCYCCB+
CCB-

S
P
F
2
5

Auxiliary
Supply

L1
L2

Com
C01
C02
|

C06

Mains Connections:
Phase 1 control:
Neutral control:
Commands:
Load Current CT:
Capacitor Current CT:

-7-

Front Facia of SPF-25:
LCD Display

Step status LED indication
Serial Communication Port

Membrane Keypad

Usage of the UP and DN key makes the LCD display to scroll up
and down. This is used for display of various status as well as for
viewing the On line measured electrical values.
These keys are also used for changing values in Parameters
Editing mode and used for status changing of banks in Manual
mode.
Usage of ENT key is for entering the submenu and / or for setting
up some values.
The L and R keys are used in changing the position of the cursor
from Left to Right and vice-versa.

-8-

RS-232 serial communication 9 pin D connector:

5

4

6

3

7

2

8

1

9
RXD

GND

TXD

RS-232 cable connection Details:

PIN
NO

PC side
Connection

CONNECTION

SPF-25

1

NC

2

RXD

TXD

3

TXD

RXD

GND

GND

4
5
6
7
8
9

NC

-9-

Display of Various Parameters / Status:
PAGE: 00

COSΦ= -0.99 A OK

This is default display screen giving
information on PF, mode and
working status.

COSΦ= -0.99 :This part of the display indicates the Power Factor running value. The
sign –ve indicates that PF is Capacitive and no sign (+ve) indicates that PF is Inductive.
The PF indicated is the overall PF of the three phase system.
A or M :
This part either indicates the letter “A” or letter “M”. The letter A means
that SPF-25 is working in Auto mode.
The letter M means that SPF-25 is presently in Manual mode.
The Auto or Manual modes can be selected by pressing ENT key on this page.
(If Password option is enabled, enter the same by using UP/DN/L/R keys and then
Pressing ENT)
Then by UP or DN key you can stroll between the displays:
“1. Edit Mode”, “2. Auto Mode”, “3.Manual Mode”.
The first one “1.Edit Mode” is for parameter changing. The details of parameter changing
are explained in detail in later part of this manual.
The second and third one as display indicates are for selecting Auto or Manual mode
respectively. The ENT key pressed on selecting the mode desired, puts the SPF-25 into
that mode.
Auto Mode: In this mode SPF-25 works in automatic mode. It switches the capacitor
banks automatically depending on the parameter setting of target PF. This mode is the
default mode and is to be used for unmanned operation of the system controlled by
SPF-25.
Manual Mode: This mode is activated for checking/testing the capacitor banks switching.
Its also used for changing the Masking status of the capacitor banks. More on this is
explained later. (On Page 01 explanation)
OK or ** :
The last part of the display that is blinking every 500mS indicates the
working status of SPF-25. “OK” indicates that unit is working fine without any trip
conditions. If there is other indication, the meaning of the same can be as:
OK
:
No Fault
OC
:
Over Capacitor Current
UC
:
Under Capacitor Current
OL
:
Over Load
UL
:
Under Load
OV
:
Over Voltage
UV
:
Under Voltage
OF
:
Over Frequency
UF
:
Under Frequency
OH
:
Over Capacitor Current THD %.
OB
:
Out of Banks
LU
:
Load Unbalance
BF
:
Battery Failure (RTC)
NV
:
NVRAM Checksum Error
VA
:
Voltage Absent
- 10 -

PAGE: 01

PAGE: 01

______

AUTO

______

MAN

This display indicates the Bank status in Auto mode and in Manual mode it helps
to make the specific bank On or Off or declare masked.
: Means Bank is On.
: Means Bank is Off.
: Means Bank is Off and is declared masked (out of action)
: Means Bank does not exist for compensation.
When the Page 01 is in Auto mode, its only for indication of Bank status.
But in Manual mode, the “ENT” key press activates the manual control
mode. The cursor over the bank number starts blinking. The UP and DN
keys can turn On and Off the respective bank.
The DN key pressed puts the respective bank in Masking mode and another
press of DN key brings it out of Masking mode.

Putting the bank masking status permanently:
If a bank is to be permanently put in masked mode or is to be brought out of
permanent masked mode, it can be done by bringing the blinking cursor on
the position of the respective bank by use of L or R key. Then by pressing
DN key, bring the status of the bank to the required level (Masked or
Unmasked). Then press ENT key so that cursor stops blinking. After that by
pressing UP key go to Page 00. Then Press ENT. (If Password option is
enabled, enter the same by using UP/DN/L/R keys and then Press ENT)
“1.EDIT MODE” would be displayed. Press ENT one more time. “1.General
and IO” would be displayed. Press ENT again. “Pwd : Disable” or “Pwd :
Enable” would be displayed. Press UP key. “Exit: No Save” would be
displayed. Press ENT so that cursor will start blinking. Press UP. “Exit: With
Save” would be displayed with cursor blinking. Press ENT. “Saving in
EEPROM” would be displayed for a short time and then Page 00 would be
displayed.
You will observe that the bank status as requirement is changed
permanently to the status desired.

- 11 -

PAGE: 02

1.Overall Values
PRESS
PAGE: 02.1

Avg Vol: 415.7 V
PAGE: 02.2

Avg Cur: 0123.4A
PAGE: 02.3

Tot KW:

0081.2

PAGE: 02.4

TotKVAR: 0024.6
PAGE: 02.5

Tot KVA: 0101.1
PAGE: 02.6

Avg CC:

0031.3A

PAGE: 02.7

CKVAR:

028.35

PAGE: 02.8

LS PF:

0.82

PAGE: 02.9

LS KVAR: 0043.9
PAGE: 02.10

LS KVA:

0125.7

PAGE: 02.11

Freq:

49.9Hz

The Overall values Display menu has submenus as displayed above. As its
self explanatory it means:
Avg Vol: Average voltage of all the three line to line voltage values.
Avg Cur: Average current of all the three phase line current values.
Tot KW: Overall kW of the three phase system measured at source.
TotKVAR: Overall kVAr of the three phase system measured at source.
Tot KVA: Overall kVA of the three phase system measured at source.
Avg CC: Average of three phase current through capacitor panel.
CKVAR: Capacitive kVAr that is compensated by the system.
LS PF: Load side PF. (PF value if not compensated.
LS KVAR: Load side kVAr.
LS KVA: Load side kVA.
Freq: Supply frequency in Hz.
- 12 -

PAGE: 03

2.Per-Phase RMS

PRESS
PAGE: 03.1

R-Y Vol: 415.7 V
PAGE: 03.2

Y-B Vol: 415.7 V
PAGE: 03.3

B-R Vol: 415.7 V
PAGE: 03.4

Rph Cur: 0110.8A
PAGE: 03.5

Yph Cur: 0110.8A
PAGE: 03.6

Bph Cur: 0110.8A
PAGE: 03.7

Neutral: 0010.2A
PAGE: 03.8

Rph Cap: 0022.5A
PAGE: 03.9

Yph Cap: 0022.5A
PAGE: 03.10

Bph Cap: 0022.5A

Per Phase RMS: Submenu:
R-Y Vol: Measured AC Voltage RMS value across R and Y phase.
Y-B Vol: Measured AC Voltage RMS value across Y and B phase.
B-R Vol: Measured AC Voltage RMS value across B and R phase.
Rph Cur: Line current RMS value in R phase. Mains source.
Yph Cur: Line current RMS value in Y phase. Mains source.
Bph Cur: Line current RMS value in B phase. Mains source.
Neutral: Neutral current RMS value.
Rph Cap: Capacitor current RMS value in R phase.
Yph Cap: Capacitor current RMS value in Y phase.
Bph Cap: Capacitor current RMS value in B phase.

- 13 -

PAGE: 04

3.Power
PRESS
PAGE: 04.1

Rph PF:

PAGE: 04.10

1.00

Rph KVA: 0109.7

PAGE: 04.2

Yph PF:

PAGE: 04.11

1.00

Yph KVA: 0109.7

PAGE: 04.3

Bph PF:

PAGE: 04.12

1.00

Bph KVA: 0109.7

PAGE: 04.4

Rph KW:

PAGE: 04.13

0100.2

RphCKVAR: 010.76

PAGE: 04.5

Yph KW:

PAGE: 04.14

0100.2

YphCKVAR: 010.76

PAGE: 04.6

Bph KW:

PAGE: 04.15

0100.2

BphCKVAR: 010.76

PAGE: 04.7

PAGE: 04.16

RphKVAR: 0020.4

Rph mF

PAGE: 04.8

: 165.06

PAGE: 04.17

YphKVAR: 0020.4

Yph mF

PAGE: 04.9

: 165.06

PAGE: 04.18

BphKVAR: 0020.4

Bph mF

: 165.06

Power: Submenu:
Rph PF: Power Factor of R phase on mains source.
Yph PF: Power Factor of Y phase on mains source.
Bph PF: Power Factor of B phase on mains source.
Rph kW: Active Power in kW in R-phase.
Yph kW: Active Power in kW in Y-phase.
Bph kW: Active Power in kW in B-phase.
RphkVAR: Reactive Power in kVAr in R-phase.
YphkVAR: Reactive Power in kVAr in Y-phase.
BphkVAR: Reactive Power in kVAr in B-phase.
Rph KVA: Apparent Power in kVA in R-phase.
Yph KVA: Apparent Power in kVA in Y-phase.
Bph KVA: Apparent Power in kVA in B-phase.
RphCKVAR: Capacitor injected reactive power in R-phase.
YphCKVAR: Capacitor injected reactive power in Y-phase.
BphCKVAR: Capacitor injected reactive power in B-phase.
Rph mF: Capacitor value in micro-farad in R-phase.
Yph mF: Capacitor value in micro-farad in Y-phase.
Bph mF: Capacitor value in micro-farad in B-phase.
- 14 -

PAGE: 05

4.Energy
PRESS
PAGE: 05.1

KWH:

1234567.8

PAGE: 05.2

IndKVARH:12345.6
PAGE: 05.3

CapKVARH:12345.6
PAGE: 05.4

KVAH:

1234567.8

PAGE: 05.5

CKVARH:1234567.8

Energy: Submenu:
KWH: Overall cumulative active energy in kWh on Mains supply.
IndKVARH: Inductive reactive energy in kVArh on Mains supply.
CapKVARH: Capacitive reactive energy in kVArh on Mains supply.
KVAH: Overall cumulative apparent energy in kVA on Mains supply.
CKVARH: Capacitor compensated reactive energy in kVArh.

- 15 -

PAGE: 06

5.Harmonics
PRESS
PAGE: 06.1

Vr-THD-F: 002.4%
PAGE: 06.2

Vy-THD-F: 002.4%
PAGE: 06.3

Vb-THD-F: 002.4%
PAGE: 06.4

Ir-THD-F: 012.5%
PAGE: 06.5

Iy-THD-F: 012.5%
PAGE: 06.6

Ib-THD-F: 012.5%
PAGE: 06.7

In-THD-F: 005.0%
PAGE: 06.8

CCr-THD-F:028.2%
PAGE: 06.9

CCy-THD-F:028.2%
PAGE: 06.10

CCb-THD-F:028.2%

Harmonics: Submenu:
Vr-THD-F/R: R-Y line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Vy-THD-F/R: Y-B line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Vb-THD-F/R: B-R line voltage % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Ir-THD-F/R: R phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Iy-THD-F/R: Y phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
Ib-THD-F/R: B phase current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
In-THD-F/R: Neutral current % Total Harmonic Distortion. (F-Fundamental/ R-RMS)
CCr-THD-F/R: R phase Capacitor current % Total Harmonic Distortion.
CCy-THD-F/R: Y phase Capacitor current % Total Harmonic Distortion.
CCb-THD-F/R: B phase Capacitor current % Total Harmonic Distortion.

- 16 -

PAGE: 07

6.Step KVAR
PRESS
PAGE: 07.1

Stp1 KVAR:0009.0
PAGE: 07.2

Stp2 KVAR:0009.0
PAGE: 07.3

Stp3 KVAR:0009.0
PAGE: 07.4

Stp4 KVAR:0009.0
PAGE: 07.5

Stp5 KVAR:0009.0
PAGE: 07.6

Stp6 KVAR:0009.0

Step KVAR: Submenu:
Stp1 KVAR: Step 1 kVAr value normalized at Capacitor rated voltage.
Stp2 KVAR: Step 2 kVAr value normalized at Capacitor rated voltage.
Stp3 KVAR: Step 3 kVAr value normalized at Capacitor rated voltage.
Stp4 KVAR: Step 4 kVAr value normalized at Capacitor rated voltage.
Stp5 KVAR: Step 5 kVAr value normalized at Capacitor rated voltage.
Stp6 KVAR: Step 6 kVAr value normalized at Capacitor rated voltage.

- 17 -

PAGE: 08

Time: 10:10:00
Real Time Clock: RTC time set in the SPF-25 is displayed here. Its in
HH:MM:SS format.

PAGE: 09

Date: 07:11:06
Real Time Clock: RTC date set in the SPF-25 is displayed here. Its in
dd:mm:yy format.

PAGE: 10

SPF-25 1.0.6

SPF-25 internal firmware version number is displayed here. (Just for user
information)

Total number of Main display pages are 11nos ranging from “00” to
“10”.

- 18 -

Method for Keyboard/Display usage.

Flow chart for entering into different modes:

PRESS
Enable

Default
Display
mode

If Password
Option is
Enable/Disable.

Disable

Enter Pwd: ****
PRESS
Enter the 4
Digit password
By use of
L, R, UP & DN
Keys.

PRESS

NO

IF
PASSWORD
Correct?

*

YES
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

1.Edit Mode

2.Auto Mode

3.Manual Mode

- 19 -

Parameter Editing Submenu Level 1:

*
1.General
2.System
3.Fault
4.Step
5.Communication

Sub-menu
Level 1
for
Parameter
Editing.

Parameter Editing
Sub-Menu
LEVEL 2

1.General and IO: Parameters related with general function and Input/Output
2. System: Electrical system (Mains supply) related parameters.

3. Fault: Setting Faults and fault levels.
4. Step: Capacitor Steps related parameters.
5. Communication: Parameters related with communication and data logging.

- 20 -

Parameter Editing Method:
(For Submenu Level 2 : L2)

Sub-Menu Level 1.
Cursor Blinking
at Parameter Values.

1.Submenu L2: ****

1.Submenu L2: ****
PRESS

key to increment value.

PRESS

Key to decrement value.

PRESS

Key to shift cursor Left.

PRESS

Key to shift cursor Right.
2.Submenu L2: ****

2.Submenu L2: ****
PRESS

key to increment value.

PRESS

Key to decrement value.

PRESS

Key to shift cursor Left.

PRESS

Key to shift cursor Right.

3.Submenu L2: ****

Exit: No Save

Exit: No Save

Without saving

Default
Display.

With saving

Screen for 1second

Saving In EEProm

Exit: With Save

- 21 -

Parameter Editing Submenu Level 2:
Menu
General

Parameter
Pwd
Ch-Pwd
Ld Def
THD
Rst. Energy

Meaning of Parameter
Password Control
Password value
Load all factory default parameters.
Type of THD factor to be displayed
Energy Counters reset to zero option

Default
Enable
1111
No
F-THD
No

Menu
System

Parameter
Meas. Vol.
Ld. Cur. Pr.
Cap. Cur. Pr.
PF Target
PF Target
Auto Sync
Async Tol.
Reset Async

Meaning of Parameter
Default
SPF-25 rated measurement voltage
440
Primary current value of mains CT
0180
0075
Primary current value of capacitor CT
Target PF for deciding Lag or Lead
Lag
1.00
Target PF exact value
Automatic synchronisation requirement Yes
% load variation tolerence for Auto-sync. 30
No
Reset Auto-sync to default value.

Menu
Fault

Parameter
Over Vol.
Over Vol. Lim
Over Vol. Clr
Under Vol.
Under Vol. Lim
Under Vol. Clr
Over Load
Over Ld. Lim
Over Ld. Clr
Under Ld.
Under Ld. Lim
Under Ld. Clr
Ld. Unbalance
Ld. Unb. Lim
Over CC
Over CC. Lim
Over CC. Clr
Over CC. Rst.
Over CC. Rst.
Under CC.
Under CC. Lim
Under CC. CLr
CC THD
CC THD Lim
CC THD Clr
Step Check
Cap. Cur Tol
Under Comp.
RTC Bat

Meaning of Parameter
Default
Over Voltage Fault: action by PDE-30 Off Step
Over Voltage activation limit value
1.10
Over Voltage resumption limit value 1.05
Under Voltage Fault: Action?
Off Step
Under Voltage activation limit value 0.70
Under Voltage resumption limit value 0.75
Over Load Fault: Action?
Indicate
Mains current over load limit value
1.30
Mains cur. over load resume value
1.25
Under Load on Mains: Action?
Indicate
Under load Activation limit value
0.03
Under load Resumption limit value
0.05
Load Un-balance Fault: Action?
Off Step
Load Un-balance limit
025%
Capacitor Over Current Fault: Action? Disable
Cap. Over Current Limit value.
1.30
Cap. Over Current Resume value.
1.25
Auto reset feature on Cap. Over Cur. No
If Over CC. Rst.=Yes. Time for reset. 120 sec
Under Capacitor current fault: Action? Disable
Under Cap. Cur. Limit value.
0.95
Under Cap. Cur. Resume value.
0.97
Capacitor current Over THD: Action? Disable
Cap.Cur. Over THD limit value.
0.10
Cap.Cur. Over THD resume value.
0.08
Every step kVAr healthiness monitor. Disable
Step kVAr healthiness: tolerence.
0.10
Out of Banks Indication.
Disable
RTC Battery fault monitoring.
Enable

- 22 -

Min
Disable
0000
No
R-THD
No
Min
Non
0001
0001
Lead
0.70Lag
No
01
No

Min

Max
Enable
9999
Yes
F-THD
Yes
Max
Edible
9999
9999
Lag
0.85Lead
Yes
50
Yes

Max

Disable, Indicative, Off Step

0.90
0.85

1.20
1.15

Disable, Indicative, Off Step

0.70
0.75

0.95
1.00

Disable, Indicative, Off Step

1.10
1.05

1.30
1.25

Disable, Indicative, Off Step

0.01
0.02

0.20
0.25

Disable, Indicative, Off Step

005%

100%

Disable, Indicative, Off Step

1.05
1.00
No
15

1.50
1.45
Yes
900

Disable, Indicative, Off Step

0.75
0.80

0.98
1.00

Disable, Indicative, Off Step

0.02
0.01
Disable
0.03
Disable
Disable

0.99
0.90
Enable
0.50
Enable
Enable

Menu
Step

Parameter
No. of Steps
Step Vol
Corr. Time
Discharge Time
Step 1 KVAR
Step 2 KVAR
Step 3 KVAR
Step 4 KVAR
Step 5 KVAR
Step 6 KVAR

Meaning of Parameter
Number of Capacitor steps utilised
Voltage at which kVAr is defined
Correction cycle time.
Capacitor discharge time.
Step 1 kVAr value.
Step 2 kVAr value.
Step 3 kVAr value.
Step 4 kVAr value.
Step 5 kVAr value.
Step 6 kVAr value.

Menu
Parameter
Meaning of Parameter
Communication Unit ID
Communication ID of the unit
Baud Rate
Serial communication baud rate.
Time
RTC time to be set
Date
RTC date to be set
Init RTC
Initialise RTC?
Clear NVRAM Clear all contents on NV RAM?

Default
3
440
120 secs
120 secs
006
009
018
018
018
018

Min
1
380
010
010
001
001
001
001
001
001

Default
3001
09600
--No
No

Min
0000
04800
--No
No

Max
6
660
240
240
250
250
250
250
250
250

Max
9999
38400
--Yes
Yes

Note that all the parameters in the Sub-Menu Level 2 should be carefully filled in the
SPF-25. Failing to put the correct parameters can make SPF-25 to malfunction.
Its therefore advised that a trained person should only be allowed to change these
values.

- 23 -

Commissioning Instructions :
before panel is powered up for the first time.
1. Panel Wiring Check
Ensure that all connections in the panel is tightened properly and there are no
loose connections. Also ensure that the wiring is done as per the wiring
diagram.
2. Power Wiring Check
Ensure that the power cables are connected properly from the Panel I/C to the
feeder I/C or the transformer bushings. The connection has to be after the
Load Feed back CT looking from the Transformer side.
Ensure that the Bus Bars and/or Lugs are clean and free of Dust, Corrosion or
Oxidation on the contact sides so that good electrical connection is maintained.
The surface area should be flat so as to get maximum contact area.
If required Clean the Bus Bars and/ or Lugs by rubbing it with Polish Paper to
remove the oxidation layer. Provide contact paste in between the contacts
surfaces.
Not performing this, can result in to a weaker source point for Capacitor
charging during Step on and this can generate undesirable Noise which can
hamper the performance of equipments installed in the capacitor panel.
3. Load Feed Back CT connection.
Ensure that the load feed back CT connections are done properly. Confirm that
correct phase CT is connected with the correct phase input terminals. (Even
though auto sync is capable of taking care of wrong CT polarities or CT
position interchanging, but then on display, the Phase readings may be seen to
be interchanged. (May be R-phase reading would be seen in B-phase and
vice-versa.
CT connections to be done carefully so as to ensure that the wire does not get
open and there is no loose connection.

Loose connection’s or open CT secondary can result in to very high voltages
getting developed in the circuit which can damage the CT and also produce
high levels of noise in the system.

- 24 -

Fault Finding Guidelines :

Fault Type

Probable Reason

Action to Take

Unit Does not
turn ON. No
display on LCD.

•Input auxiliary supply
not coming.
•Input side fuses
blown

•Check the input
supply to restore
•Check fuses in the
unit for OK.

Unit does not
turn On any
capacitors even
if PF is below
Lower PF limit.

•If auto-sync failure
message is there at
Power On.

• Load may be highly
fluctuating so need of
manual
synchronisation only.
• This is OK
condition.

• The load KW is too
low with Under load
fault enable condition.
•Control connections
from SPF-25 to
contactor coils are not
proper

•Check control supply
and connections from
SPF-25 to contactors.

BF indication on
Default display.

• Internal Ni-Cd
3.2Vdc battery used
for RTC and NV RAM
must be drained down.

• Replace this battery
in consultancy with
TAS trained
personnel.

Some Capacitor
banks are
declared as
faulty even if
they are
checked to be
OK.

•Individual step health
monitoring is enabled
and tolerance limits
set are too stringent.
• Capacitor current
THD factor is
continuously
fluctuating.

•Set the tolerance
limits for individual
steps monitoring as
relaxed.
• With continuously
fluctuating THD of
Capacitor current and
higher level of THD
can cause some
errors in individual
step KVAR
measurement. Under
this condition, best is
to keep this feature
disabled.

- 25 -

Fault Finding Guidelines (continued):

Fault Type

Probable Reason

Action to Take

Serial
Communication
is not working.

• Baud rate selection
is not proper.
• Unit ID is not set
properly.
• Serial
communication cable
connections are not
proper.

• Select proper baud
rate.
• Set the unit ID
correctly.
• Check the serial
cable continuity as
per the connections
given earlier in this
manual.

Data logging is
not taking place.

• Possible that RTC
date is not set
properly.

• Change the battery
by help of TAS’s
authorised person.

SPF-25 resets
occasionally on
turning OFF of
any contactor.

• The contactor supply
phase may be the
same as used for SPF25 auxiliary supply.
• RC snubbers/ free
wheeling diodes are
not put with contactor
coils.

• Use the different
phase for control
supply of contactors
and for SPF-25 supply
• Usage of RC
snubbers / free
wheeling diodes is
mandatory.

- 26 -

Corporate Office/Works/Design Centre:
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Tel: +91-(253)-2384038 / 2381090
Email: [email protected]
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