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Mitsubishi Electric FX5 User Manual Page 76

Melsec iq-f series.
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Overshoot suppression setting
Set the overshoot suppression processing. Especially, when the difference between the target value and current value is big,
turn b7 of (s3)+1 ON. It is effective to suppress the overshoot during PID control operation.
Set item
Operation setting
Temperature
If the output variation rate ΔMV is large during the initial scan time, the output will be suppressed in the following manner.
Output value (MV)
(1)
(2)
(4)
If the overshoot suppression setting is not used, the PID control operation with similar performance to the FX3
PLC will be executed.
Hunting suppression setting
Especially, if the step response method auto-tuning (Page 82 Auto-Tuning) is executed in an environment where the
measurement value varies temporarily because of noise of the sensor and analog input, auto-tuning may be not executed
correctly and hunting may occur during PID control operation.
When b8 of (s3)+1 is turned ON and the current input value is less than the previous input value temporarily, auto-tuning is not
completed until the set timeout time has elapsed. Therefore, maximum ramp (R) can be obtained correctly. (See the figure
below.)
To use this function, turn ON b4 of (s3)+1 and OFF b6 of (s3)+1.
Set item
Operation setting
10 PID CONTROL FUNCTION
74
10.6 Details of Parameters
(s3)+1: b7
(1)
(2)
(3)
(s3)+1: b4
(s3)+1: b6
(s3)+1: b8
(s3)+25
Overshoot suppression setting
(1) Overshoot suppression setting invalid
(2) Overshoot suppression setting valid
(3) If overshoot suppression setting is invalid, the first output
variation ΔMV is determined by this difference.
Target
value
(3)
Time
(1) Initial output value is large
(2) Overshoot suppression setting invalid
(3) Overshoot suppression setting valid
(4) The output variation rate is forcibly set to 0, so the initial output
value will be 0. (When offset value offset is 0)
Time
Auto-tuning
Auto-tuning mode
Hunting suppression setting
Timeout time setting value after
maximum ramp (R) detection
Setting description/Setting
range
ON: Used
OFF: Not used
Setting description/Setting
range
Make sure to set it to ON
Make sure to set it to OFF
ON: Used
OFF: Not used
1 to 32767

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