14033590.01 10/2014 GB/D
WIKA operating instructions model CS4S
39
GB
9.2 PID auto tuning
In order to determine the ideal values for P, I, D and ARW automatically, the controller
generates fluctuations in the control loop.
If, with a rise in temperature, there is a greater difference between the set point and
the actual value
Disturbances are generated if the temperature around the set BIAS value (here e.g. 20 °C)
is lower than the set point.
Determining the PID parameters
Parameter determination completed
Controlling with the control parameters
determined through auto tuning
AT BIAS value
Temperature 20 °C lower than the set point
Time
Temper
atur
e
Set point
AT starting time
When the control is stable or the actual value is in the range of the set point ±20 °C (°F)
Disturbances are generated around the set point.
Determining the PID parameters
Parameter determination completed
Controlling with the control parameters
determined through auto tuning
Time
Temper
atur
e
Set point
AT starting time
9. Control mode
