Omron VARISPEED F7 User Manual page 286

PID Adjustment Examples
Suppressing Overshoot
If overshoot occurs, reduce Proportional gain (P), 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 differential
time (D).
Response
Suppressing Long-cycle Vibration
If vibration occurs with a longer cycle than the integral time (I) set value, lengthen the integral time (I) to sup-
press the vibration.
Response
Suppressing Short Cycle Vibration
If vibration occurs when the vibration cycle duration is short, and the cycle duration is almost identical to the
differential time (D) set value, the differential operation is too strong. Shorten the differential time (D) to sup-
press the vibration.
If vibration continues even when the differential time (D) is set to 0.00 (D control disabled), reduce the pro-
portional gain (P), or increase the PID primary delay time constant.
Response
Before adjustment
After adjustment
Time
Before adjustment
After adjustment
Time
Before adjustment
After adjustment
Time
Before adjustment
After adjustment
Time
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