Example Of Parameter Adjustment And The Effect On Pid Control Operation; Improvement Of Control Results - Mitsubishi Electric FX5 User Manual
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10.9
Example of parameter adjustment and the effect
on PID control operation
This section describes parameters that can be adjusted to improve the PID control result and the effect of the parameters.
Improvement of control results
The following table shows the outline of the details to be improved and methods for improvement.
Details to be improved
Overshoot suppression
Hunting suppression
Reduction of remaining deviation
Overshoot suppression
When suppressing overshoot, the operation is as follows.
■When auto-tuning is executed
When the step response method and the PID control are executed continuously and the following results are obtained, use
the overshoot suppression setting (turn ON b7 of (s3)+1). The overshoot amount may be suppressed.
Control result when the overshoot suppression setting is not
used
Input value
(PV)
Target value
Output value
(MV)
(3)
(1) Overshoot
(2) The output is increased at the time of shifting to the PID control.
(3) Auto-tuning is finished
10 PID CONTROL FUNCTION
98
10.9 Example of parameter adjustment and the effect on PID control operation
Auto-Tuning
Auto-tuning is executed
Auto-tuning is not executed
Auto-tuning is executed
Auto-tuning is not executed
(1)
Time
(2)
Time
Contents
Use overshoot suppression setting.
Use overshoot suppression setting.
Increase the integral time and execute.
Shorten the sampling time and execute.
Use the hunting suppression setting.
Set the sampling time to be the output period or more and execute.
Increase the filter input value and execute.
Decrease the proportional gain and execute.
Increase the differential time and execute.
Shorten the sampling time and execute.
Increase the filter input value and execute.
Control result when the overshoot suppression setting is used
Input value
(PV)
(1)
Target value
Output value
(MV)
(2)
(3)
(1) The overshoot amount decreases.
(2) Overshoot is suppressed.
(3) Auto-tuning is finished
Time
Time
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