Mitsubishi Electric FX5 User Manual page 101
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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■When auto-tuning is not executed
When the PID control is executed and a large initial output causes overshoot, use the overshoot suppression setting (b7 of
(s3)+1 turns ON). The overshoot amount may be suppressed.
Control result when the overshoot suppression setting is not
used
Input value
(PV)
(1)
Target value
Output value
(MV)
(2)
(1) Overshoot
(2) The initial output is large.
When overshoot remains, suppress overshoot by increasing the integral time.
• Overshoot suppression by increasing the integral time
When overshoot occurs even if the initial output is suppressed by the overshoot suppression setting, increase the integral
time ((s3)+4). Overshoot may be suppressed. However, when the integral time is increased excessively, reaching the target
value may be delayed or remaining deviation may occur.
Control result before the change
Input value
(PV)
(1)
Target value
Output value
(MV)
(2)
(1) Overshoot
(2) The peak of the output is large.
When the first output value is large, use the overshoot suppression setting first.
Control result when the overshoot suppression setting is used
Input value
(PV)
Target value
Time
Output value
(MV)
Time
(1) Overshoot is suppressed.
(2) The initial output is suppressed.
Control result when the integral time is increased
Input value
(PV)
Target value
Time
Output value
(MV)
Time
(1) Overshoot is suppressed.
(2) The peak of the output is small.
10.9 Example of parameter adjustment and the effect on PID control operation
(1)
(2)
(1)
(2)
10 PID CONTROL FUNCTION
10
Time
Time
Time
Time
99
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