Transcript Creep Test Furnace

26/2704 Applications
•Control functions
•Feedforward
•Cascade
•Ratio
•Override
•Real 26/2704 Applications
EUROTHERM
CONTROLS
Ref: P
.ppt (21/07/2015) 1
a
26/2704 Feedforward Control
•Predicts process changes
•Ideal in interactive processes
•Compensates for transport delays
Applications :
•Water Treatment
•Conveyor furnaces
•Boiler drum level
•General process control
Remote Input
Feedforward
Scaling
FF Value
SP
PV
EUROTHERM
CONTROLS
PID
Loop
Ref: P
.ppt (21/07/2015) 2
PID OP
+
Control OP
a
26/2704 Feedforward Application
•Immediate compensation for flow changes
•Prevents dangerous over-dosing
•Auto-selection of PID parameters
Setpoint
Chlorine
PID Loop
Feedforward
+
26/2704
FT
AT
Dosing Pump
Flow Meter
EUROTHERM
CONTROLS
Ref: P
.ppt (21/07/2015) 3
a
26/2704 Cascade Controller
•Compensation for process delays
•Accurate control of furnace load
Applications :
•Vacuum furnaces
•Autoclaves
•Batch reaction vessels
•Heat exchangers
•Boiler drum level
Master SP
Master PV
Master PID
Loop
*Remote Input
Slave PV
EUROTHERM
CONTROLS
OP
Scale to
slave span
Feedforward
Feedforward
Select
Ref: P
.ppt (21/07/2015) 4
WSP
Slave PID
Loop
Control OP
a
26/2704 Cascade application
•Boiler drum level control
•Inlet flow compensation
•Steam demand compensation
Steam Flow to Plant
FT
Level
SP
Steam Drum
Feedforward
Master Loop
P only
LT
Flow
SP
Slave Loop
PI only
26/2704
FT
Feedwater Inlet Flow
EUROTHERM
CONTROLS
Ref: P
.ppt (21/07/2015) 5
a
26/2704 Ratio Controller
•Combustion control
•Chemical dosing
•On-line mixing
Applications :
•Gas fired furnaces
•Glass forehearths
•Incinerators
•Water treatment
•Brick manufacture
Ratio Trim
Ratio SP
+
Lead PV
X
Main SP
Main PV
EUROTHERM
CONTROLS
Main PID
Loop
Ref: P
.ppt (21/07/2015) 6
Control Output
a
26/2704 Ratio Application
•Maintains constant ratio
•Start up in manual
•Bumpless transfer into auto
Lead PV
FT
Ratio SP
FT
X
WSP
Main PV
Main
Control OP
PID Loop
26/2704
EUROTHERM
CONTROLS
Ref: P
.ppt (21/07/2015) 7
a
26/2704 Override Controller
•Controls both heater and product temperature
•Provides overheating protection
•Limits temperature gradients across product
•Temperature control with pressure override
Applications :
•Vacuum furnaces
•Autoclaves
•Batch reactors (glass lined)
Main SP
Main PV
Main PID
Loop
Output
Selection
Override SP
Override PV
EUROTHERM
CONTROLS
Control Output
Override PID
Loop
Ref: P
.ppt (21/07/2015) 8
a
26/2704 Override Application
•Accurate load control
•Limits heater temperature
•Minimises heat up time
Heaters
Load SP
Load
PID Loop
Min
Heater SP
Heat OP
OP Select
Heater
Load
PID Loop
Vacuum Furnace
26/2704
EUROTHERM
CONTROLS
Ref: P
.ppt (21/07/2015) 9
a
Creep Test Furnace
Application requirements
•Accurate 3 zone control
•Simple operation
•Measurement of creepage
•Interface to a PC
Heaters
Why 26/2704?
•3 Control loops
•3 isolated TC inputs
•Interface to LVDT transducer
•Internal SP wiring
Load
Setpoint
Top TC
_
Top
PID Loop
Heat OP
Centre TC
_
Centre
PID loop
Heat OP
Bottom TC
_
Bottom
PID loop
Heat OP
LVDT Sensor
Creep Furnace
Alarms
26/2704
20Kg
EUROTHERM
CONTROLS
Creep
measurement
Ref: P
10
.ppt (21/07/2015)
a
Vacuum Brazing Furnace
Application requirements
•Guaranteed dwell time
•Minimum process time
•Stable temperature control
•Interface to a PLC
Why 26/2704?
•3 TC inputs
•Cascade with SP feedforward
•Program wait function
•Program digital inputs
Load TC
SP Feedforward
Furnace SP
Furnace TC
_
Furnace
PID
+
Heater SP
Heater TC
Loa
d
_
Heater
PID
Heat OP
26/2704
Vacuum Furnace
EUROTHERM
CONTROLS
Ref: P
11
.ppt (21/07/2015)
a
Brick Dying Oven
Application requirements
•Temp & humidity control
•Valve position control
•Simple program operation
Why 26/2704?
•2 Control loops
•2 Synchronised SP profiles
•BCD program selection
•Run & reset digital inputs
VP
Oven %RH
_
Humidity
PID
VP Output
Oven Temp
_
Temp
PID
VP Output
Run
Reset
BCD Select
Hot Air Hot Air
Drying Oven
EUROTHERM
CONTROLS
VP
Ref: P
12
26/2704
.ppt (21/07/2015)
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Soft drink Pasteurisation
Application requirements
•Ensure product temp >91.5 C
•Start up in local mode
Why 26/2704?
•Cascade with SP feedforward
•Cascade tracking function
•Simple operation
_
Steam RTD
Product
Steam
T
Steam
PID
Heat OP
Steam SP
Product SP
SP FF
+
T
Master OP
Product RTD
Pasteurising Heat
Exchanger
EUROTHERM
CONTROLS
_
Product
PID
26/2704
Ref: P
13
.ppt (21/07/2015)
a
Glass Annealing
Application requirements
•Accurate & stable control
•Long SP programs(300 days)
•Variable deviation alarm
•Heat/cool overlap
Why 26/2704?
•Input precision - 0.25uV
•2 Synchronised SP profiles
•Power failure recovery modes
•Analogue OP scaling
Alarm SP
Deviation
Alarm
Error
Furnace SP
Furnace TC
Loa
d
Heat
Hot
AirOP
Cool OP
Furnace
PID
Working OP
Output
scaling
26/2704
Glass Furnace
EUROTHERM
CONTROLS
_
Ref: P
14
.ppt (21/07/2015)
a
Plant Growth Chamber
Application requirements
•Control of temp, %RH & CO2
•Synchronised programs
•Simulation of day/night
•Simple 4th SP(light) profile
Why 26/2704?
•3 Control loops
•3 Synchronised SP profiles
•Real time clock
•Toolkit functions
Chamber RTD
_
Temp
PID Loop
Control OP
Temp SP
Chamber %RH
_
Time
Humidity
PID loop
Control OP
%RH SP
Toolkit
Blocks
Light SP
C02 SP
Chamber C02
Plant Growth Chamber
EUROTHERM
CONTROLS
_
C02
PID loop
Control OP
26/2704
Ref: P
15
.ppt (21/07/2015)
a
Gas Burner Ratio Control
Application requirements
•Efficient combustion
•Manual override
•Flow compensation factor
Why 26/2704?
•Controls both gas & air flows
•Ratio control function
•Maths calculations
•Logic operations
Manual
Gas SP
FT
Gas
Gas flow
X
Gas comp
Air comp
Air
X
Gas VP Output
Ratio SP
Manual
Air SP
Gas Burner
Air flow
FT
Gas
PID Loop
_
X
_
Air
PID Loop
Air VP Output
Hot Air
26/2704
EUROTHERM
CONTROLS
Ref: P
16
.ppt (21/07/2015)
a
High Power Heating System
Application requirements
•Multi-stage outputs
•Main control OP to thyristor
•Other OP’s to contactors
•Linear control transfer
Why 26/2704?
•Alarms on output power
•Maths calculations
SP(66.6%)
User
Alarm
User
Alarm
Analogue
OP
TY
SP(33.3%)
Maths
Furnace SP
Load
1
Load
2
Load
3
Furnace
temp
Hot
Air
PID
Loop
Control Output
26/2704
Heating System
EUROTHERM
CONTROLS
_
Ref: P
17
.ppt (21/07/2015)
a
Paint Drying Ovens
Application requirements
•Profiled setpoint
•Program time alarm
•Easy program selection
Why 26/2704?
•Setpoint Programmer
•Timer functions
•BCD program selection
Run
Reset
BCD selection
Pyrometer input
Oven SP
Oven Temp
_
Ref: P
18
Timer
45min
Program
time is
too long
Ended
Timer
10min
Cooling
fan
Oven
PID
Working OP
26/2704
Paint drying oven
EUROTHERM
CONTROLS
Running
.ppt (21/07/2015)
a
Flow Control with Pressure Override
Application requirements
•Control of liquid flow
•Pressure override
Why 26/2704?
•Standard override feature
•Bumpless transfer
Liquid
Flow SP
FT
Flow
PID Loop
Pump
Min
OP Select
Pressure SP
Pressure
PID Loop
PT
26/2704
EUROTHERM
CONTROLS
Ref: P
19
.ppt (21/07/2015)
a
Capacitor Heat Treatment
Application requirements
•Programs > 20 segments
•Simple programming
•Comms to Wonderware
Why 26/2704?
•SP Programmer functions
•Easy to use
•iTools OPC connection
Program events
Oven SP
Oven Temp
_
Loa
d
Working OP
26/2704
Oven
EUROTHERM
CONTROLS
Oven
PID
Ref: P
20
.ppt (21/07/2015)
a
High Temperature Vacuum Furnace
Application requirements
•Power ramp start up
•Power ramp down
•Pyrometer input
•Eliminate TC extraction
Why 26/2704?
•Controlled power ramp
•Auto transfer to closed loop
•Reduces total system cost
Pyrometer input
Furnace PV
_
Furnace
PID
Working OP
Furnace SP
Loa
d
Output
Select
Power Ramp
26/2704
Vacuum Furnace
EUROTHERM
CONTROLS
Ref: P
21
.ppt (21/07/2015)
a
Glass Pot Furnace
Application requirements
•Temperature control
•Standby setpoint
•Gas/air ratio control
•Uses no flow meters
Why 26/2704?
•2 Internal setpoints & clock
•Setpoint ramp
•Custom linearisation
•Interface to potentiometer
Furnace Temp
_
Furnace SP
SP1
SP2
Furnace
PID
VP Output
Real time
clock
VP
Glass
Air
Pot Position
Custom
Lin Block
Fan output
Fan
Gas
Glass Pot furnace
EUROTHERM
CONTROLS
Ref: P
22
.ppt (21/07/2015)
26/2704
a