Advanced commissioning
7.10 PID technology controller
SIMATIC ET 200pro FC-2 converter
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Operating Instructions, 04/2018, FW V4.7 SP10, A5E34257324B AF
Set controller parameters K
P
, T
I
and T
d
.
Procedure
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
(p2280) and re-
duce the integration time T
I
(p2285).
The actual value only slowly approaches the setpoint with
slight oscillation.
•
Increase the proportional component K
P
(p2280) and re-
duce the rate time T
d
(p2274)
The actual value quickly approaches the setpoint, but over-
shoots too much.
•
Decrease the proportional component K
P
(p2280) and
increase the integration time T
I
(p2285).
3.
Set the ramp-up and ramp-down times of the ramp-function generator back to their
original value.
You have manually set the technology controller.
❒
Limiting the output of the technology controller
In the factory setting, the output of the technology controller is limited to ± maximum speed.
You must change this limit, depending on your particular application.
Example: The output of the technology controller supplies the speed setpoint for a pump.
The pump should only run in the positive direction.
