YASKAWA Varispeed G7 Series Instruction Manual page 346

PID Fine Adjustment Methods
This section explains the fine adjustment of PID after setting the PID control constants.
Suppressing Overshoot
If overshoot occurs, reduce derivative time (D), and increase integral time (I).
Response
Set a Rapidly Stabilizing Control Condition
To rapidly stabilize the control even if overshoot occurs, reduce integral time (I), and lengthen derivative time
(D).
Suppressing Long-cycle Vibration
If vibration occurs with a longer cycle than the integral time (I) set value, the integral operation is too strong.
Lengthen the integral time (I) to suppress the vibration.
Response
Before adjustment
After adjustment
Response
Before adjustment
After adjustment
Before adjustment
After adjustment
Individual Functions
Time
Time
Time
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