Advanced commissioning
7.7 Application-specific functions
Optimizing the controller
Setting the technology controller without autotuning (manual)
Procedure
Proceed as follows to manually set the technology controller:
1. Temporarily set the ramp-up and ramp-down times of the ramp-function generator (p2257
and p2258) to zero.
2. Enter a setpoint step and monitor the associated actual value, e.g. with the trace function
of STARTER.
The slower the response of the process to be controlled, the longer you must monitor the
controller response. Under certain circumstances (e.g. for a temperature control), you
need to wait several minutes until you can evaluate the controller response.
Optimum controller response for applications that do not per-
mit any overshoot.
The actual value approaches the setpoint without any signifi-
cant overshoot.
Optimum controller behavior for fast correction and quick com-
pensation of disturbance components.
The actual value approaches the setpoint and slightly over-
shoots, maximum 10% of the setpoint step.
The actual value only slowly approaches the setpoint.
• Increase the proportional component K
P
and reduce the
integration time T
I
.
Actual value only slowly approaches the setpoint with slight
oscillation.
• Increase the proportional component K
P
and reduce the
rate time T
d
(differentiating time).
The actual value quickly approaches the setpoint, but over-
shoots too much.
• Decrease the proportional component K
P
and increase the
integration time T
I
.
3. Set the ramp-up and ramp-down times of the ramp-function generator back to their
original value.
You have now manually set the technology controller.
Converter with control units CU240D-2
192 Operating Instructions, 04/2015, FW V4.7.3, A5E34262100B AB
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