Example Of A Program For Heating/Cooling Pid Control; System Configuration; Conditions Of Operation - Mitsubishi Electric MELSEC FX Series User Manual

FX -4LC User's Manual
3U
9.3

Example of a Program for Heating/Cooling PID Control

This section provides an example of a program for heating/cooling PID control.
9.3.1

System configuration

The system configuration shown below explains the example program.
FX Series
3U
Main unit
9.3.2

Conditions of operation

The example program set up with the following operation conditions.
Initial values are used for conditions of operation other than the ones listed below. They are not shown in this
example.
Please add to the example of a program if needed.
Alarm 1 set value
Alarm 2 set value
Operation mode
PID value
Control response parameter
Overlap/Dead band
Transistor output selection
Input range
Alarm 1 mode setting
Alarm 2 mode setting
Cooling method setting
Temperature rise completion range setting
CT monitor method switch
CT ratio setting
Control mode switch
136
CH1 Measured value (PV)
CH1 Heater current
measured value
FX -4LC
3U
(Unit No.0)
Item
CH1
#49
#50
#57
Heating proportional
#58
band (P)
Cooling proportional
#59
band (P)
Integral time (I) #60
Derivative time (D) #61
#62
#63
#86
#208
#209
#210
9.3 Example of a Program for Heating/Cooling PID Control
CH1
Current
detector
(CTL-6-P-H)
OUT1 Heating control
output (MV)
OUT2 Cooling control
output (MV)
BFM No.
CH2
- Upper limit deviation is set to "30.0 C"
- Lower limit deviation is set to "-30.0 C"
- Set "3 : Monitor + Alarm + Control" (initial value)
-
-
Set by auto tuning
-
-
- Set "1 : Medium"
- Set "0" (initial value)
- Set "0" (initial value)
- Set "1 : K type -100.0 to 400.0 C"
- Set "12 : Upper limit deviation alarm with re-wait"
- Set "13 : Lower limit deviation alarm with re-wait"
#232 Set "0 : Air cooling"
#236
Set "3 C"
#238 Set "0 : ON current/OFF current" (initial value)
Set "800" (initial value)
#239
When a current detector (CTL-6-P-H) is used.
#240 Set "4"
9 Program Examples
CH1 Sensor
(Type K thermocouple)
Cooler
Temperature
chamber
Heater
Solid state relay
Conditions of operation