Checking The Controller Parameters - Siemens RWF40.000A97 User Manual

9.2 Checking the controller parameters

Example
«PB too small»
x
w
7865d17/1099
«rt, dt» too small
x
w
7865d16/1099
50/57
The optimum adjustment of the controller to the controlled system can be checked by
recording a startup sequence with the control loop closed. The following diagrams
indicate possible incorrect adjustments, and their correction.
The response to a setpoint change is shown here for a 3
PID controller. The method used for adjusting the controller parameters can, however,
also be applied to other controlled systems.
A favorable value for «dt» is «rt» / 4.
t
t
Optimum adjustment
x
w
7865d18/1099
CC1B7865en
9. Self-setting function
rd
«PB too large»
x
w
7865d15/1099
«rt, dt» too large
x
w
7865d14/1099
t
05.12.2002
order controlled system for a
t
t
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