WIKA CF1M User Manual
Page 14
Operating Instructions Temperature Indicating Controller CF1M
V1.
1
•
03/200
5
- 14 -
6.4 Heater burnout alarm drawing
7. PID auto-tuning of the CF1M
In order to decide each value of P, I, D and ARW automatically, this system forcibly fluctuates
the object being controlled.
h When the difference between setting value and processing temperature is large when
the temperature rises.
Fluctuation is given at the temperature 20°C (°F) lower than the setting value.
h When the control is stable
Fluctuation is given at the setting value.
ON
OFF
Unlit
Lit
Setting
Small
Large
Load current
11
12
11
12
Temperature
AT
:
AT
Auto-tuning starting point
PID parameter measuring
PID parameter calculated point
Controlling action is performed
with the parameters set by auto-
tuning.
Setting value
Time
1
2
3
3
2
1
Temperature 20 ( ) lower than the setting value
F
C
AT bias setting value
4
4
AT
:
AT
Temperature
Setting value
PID parameter measuring
PID parameter calculated point
Controlling action is performed
with the parameters set by auto-
tuning.
Auto-tuning starting point
Time
1
2
3
2
3
1