Transcript Boiler Efficiency and Combustion Control

Plant Wide
Controller
(PWC)
Overview
Preferred Instruments
a division of Preferred Utilities
Mfg. Corp.
PWC
Plant Wide Controller
The Plant Wide ControllerTM (PWC) is a state-ofthe-art boiler sequencing, control and monitoring
system. The PWC combines innovative ease of
operation, communication and expansion capabilities
with boiler application expertise.
Off-the-shelf,
standard
modulating
Lead-Lag
applications can be expanded to control circulating
water variable speed pumps and isolation valves while
monitoring the flame safeguard and boiler control
systems.
PWC
Easy to Operate
Key lockable Door
Security
PWC
Easy to Operate

Hardwired Control Switches & Indications:
Firing Rate
Control Dial
Firing Rate
Auto / Man
0 - 100 %
Bargraph
Status
Indications
Boiler
On-Off-Auto
PWC
Easy to Operate
LCD Graphic Display
and Keypad

Easy to use displays for:
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Boiler Plant Control &
Monitoring
Historical Trending
Alarm & Event Handling
Boiler Plant Setup
PWC
Easy to Operate
Display Keys
PAGE
UP

Home Page 

Move Cursor
Display Selection
Alarm List 

MENU
ALARM
SILENCE
ALARM
LIST
ABC
DEF
GHI
1
2
3
JKL
MNO
PQR
4
5
6
STU
VWX
YZ "
7
8
9
%#,
:< >
/+-
0
.
SPACE
ESC
ENTER
Menu, Page Up, Down 

Boiler Overview Display
Arrow Keys 

PAGE
DOWN
HOME
PAGE
Alarm, Event Display
Alarm Silence PB
PWC
Home Page
Lead / Lag Control
 Start Qty Control
 Sequence Control
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Alarm Status
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Custom
Lead Rotate
Time / Date Stamped
Header Status
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Pressure / Temperature
Setpoint
Outside Temperature
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Status
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Started Boilers
Warming Boilers
Modulating Boilers
Tripped Boilers
PWC
Alarm & Event Summary
Up to 200 Alarms &
Events
 First in - First out
 Operator Actions
 Events
 Alarms
 Time & Date Stamped

PWC
Historical Trending
An Essential
Monitoring Tool
 Multiple(4) Pen
“Charts”
 8 min, 40 min., and
2, 8, & 24 hour charts

8 channel, 2 Hr Historical Memory - Standard
 32 Mb Historical Memory - Optional
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32 ch AI + 32 ch DI every 15 seconds for 30 days
90 or more days for less channels with low activity
(depends on data compression efficiency)
PWC
Easy Setup

Fill In The Blanks
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Boiler Sequence
PID Tuning
Outdoor Reset Setup
Day / Night Setback
Day / Week Setback
Week / Year Setback
PWC
Outdoor Reset / Setback Temp.

Easily Configured:
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Normal Setpoints
Setback Setpoints
High & Low Limits
Outdoor Cutoff
Automatic Graphical
Representation
PWC
EXPANDABLE
PWC Front Door Open
(2 to 5 boiler lead / lag configuration shown
with three spare slots)
PWC
CPU Board
CPU Module
RUN
CPU OK
FORCED
BATTERY
ALARM
PROGRAMMING
PORT - COM 1
MODEM 1
 (2)
Analog Inputs
(4-20 mAdc /Thermistor)
Tx
 (1)
Rx
OH
CD
AA
RS485 - COM 2
Tx
Rx
Relay Output (SPDT, 8A)
 (1) RS232 programming Port
 (1) Isolated RS485 Port
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(Modbus or Bacnet Option)
 (1)
MODEM
RJ-11
PRINTER
PORT

Telephone Modem Option Card
Dial in or dial out, 33.6 kb, RJ-11 jack,
Data and Pagers
 (1)
Printer Port (Alarms / Logs)
PWC
Discrete Input
BOILER 1
FAN
FUEL V ALVE
LOCKOUT
BOILER 2
FAN
FUEL V ALVE
LOCKOUT
BOILER 3
FAN
FUEL VALVE
LOCKOUT
LOW FEEDWTR PSI
LOW FEED TANK LEV
 (15)
Inputs, 120 Vac, optically
isolated
 (5) groups of isolated neutrals
 (15) LED status indications
 (2) 2A / 120 Vac Fuses
F1
F2
PWC
BOILER 1
Hand-Off-Auto Relay Output
ON - OFF - AUTO
BOILER 2
ON - OFF - AUTO
BOILER 3
ON - OFF - AUTO
 (5)
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BOILER 4
ON - OFF - AUTO
CIRC PUMP 1
ON - OFF - AUTO
(8A inductive, 1/2 Hp, 120 Vac)
 (5)
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Relay Outputs
Hand-Off-Auto Toggle Switches
Toggle Switch is directly wired into
output circuit.
 (5)
LED's for Output ON / OFF
 (5) LED's for ”Call for Operation”
 (2) 2A / 120 Vac Fuses
F1
F2
PWC
BOILER 1
Auto/Manual Analog Output
M AN AU TO
BOILER 2
M AN AU TO
BOILER 3
M AN AU TO
BOILER 4
M AN AU TO
CIRC PUMP 1
M AN AU TO
 (5)
Modulating Analog Outputs
 (5) Auto-Manual Toggle Switches
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"Manual" hardware overrides CPU
Bumpless Manual to Auto Transfer
 (5)
0-100% Output Control Knobs
 (5) 0-100% Output Bargraphs
 Requires (1) Output Card per active
channel, Any combination of 4-20
mA and 135 ohm cards
PWC
Analog Input
STEAM HDR PSI
FEEDWATER HDR PSI
FUEL GAS FLOW
COND. RETURN LEVEL
MAKE- UP FLOW
DEAERATOR LEVEL
 (8)
G AS HDR FLO W
OIL HDR FLO W
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UNIVERSAL Inputs
Switch Selectable as:
» 2 wire 4-20 mA, with internal 24 Vdc
» Thermistor, -60F - 300 F
» Thermocouple, Type J, 0 - 1200 F,
• 0-5 Vdc, potentiometers and other signals
CJC
» Pulse, 0.6 ppm - 4000 Hz, 0-15 Vdc
pulsers for Oil, Gas, Water, & kWh meters
» Enables Fuel Budget Fuel Consumption
Tracking
 (8)

LED status indications
Power Ouputs and Signal Inputs are
PWC
short circuit protected
Relay Output
STEAM HDR PSI
FEEDWATER HDR PSI
DEAERATOR LEVEL
COND. RET. LEVEL
MAKE- UP FLOW
DEAERATOR LEVEL
 (8)
Isolated Relay Outputs
GAS HDR FLOW
OIL HDR FLOW
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( 8A inductive, ½ Hp, 120 Vac)
(2) SPDT, (6) NO-SPST
 (8)
LED status indications
 (2) 2A / 120 Vac Fuses
F1
F2
PWC
Communications
To Customer’s
Building Automation
Systems
(Modbus / Bacnet)
Pagers
(Modbus / Bacnet)
Boilers
Chillers etc.
Diesels
PWC
Advanced Communication Capability
 Communications
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Modbus communication to BAS or SCADA
Dial In From PC
Dial Out to Alpha Numeric Pager
PWC
Dial In From PC
PWC
Availability
 Hard
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Every Boiler Start / Stop Command & Firing
Rate can be set manually in the unlikely event of
a CPU hardware failure or software corruption
A CPU failure will not prevent central manual
control of the boiler plant
This is a UNIQUE FEATURE!
 Fault

Service Manual
Monitoring
Analog Inputs (thermisters, 4-20mA signals) are
monitored & LED used to show fault status
PWC
Installation
Spare Terminals
(typical)
Physical
Separation
Between
Operation
and Wiring
Screwed fast
Cable Tie Downs
3/4” conduit connections
Power Fuses
PWC
Custom Blockware
PWC
Custom Displays
PWC
Custom Charts
PWC
Preferred Instruments
Preferred Instruments
31-35 South Street • Danbury • CT
T: (203) 743-6741 • F: (203) 798-7313
www.preferred-mfg.com
PWC