Mitsubishi Electric FX5 User Manual page 103
Melsec iq-f series
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Also See for FX5:
- Programming manual (1112 pages) ,
- User manual (958 pages) ,
- Reference manual (44 pages)
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• Input filter value
When the filter input value ((S3)+2) is small, it is easily affected by a temporary ramp decrease caused by noise. Increase the
filter input value.
■Auto-tuning is not executed
• Hunting suppression by decreasing the proportional gain
In the following control result case, decrease the proportional gain ((S3)+3). Hunting may be suppressed. However, if the
proportional gain is too small, it takes time to reach the target value.
Control result before the change
Input value
(PV)
Target value
(1) Hunting
• Hunting suppression by increasing the differential time
In the following control result case, increase the differential time ((S3)+6). Hunting may be suppressed. However, if the
differential time is too large, it is easily affected by momentary fluctuation of noise, and the control may be unstable.
Control result before the change
Input value
(PV)
Target value
(1) Hunting
• Hunting suppression time by using the sampling time
When the response speed of the control target is high, shorten the sampling time ((S3)+0) to control finely. Hunting may be
suppressed. However, if the sampling time is too short, it is easily affected by momentary fluctuation of noise, and the control
may be unstable.
Control result before the change
Input value
(PV)
Target value
(1) Hunting
Control result when the proportional gain is decreased
Input value
(1)
Target value
Time
(1) Hunting is suppressed.
Control result when the differential time is increased
Input value
(1)
Target value
Time
(1) Hunting is suppressed.
Control result when the sampling time is shortened.
Input value
(1)
Target value
Time
(1) Hunting is suppressed.
10.9 Example of parameter adjustment and the effect on PID control operation
(PV)
(PV)
(PV)
10 PID CONTROL FUNCTION
10
(1)
Time
(1)
Time
(1)
Time
101
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