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Set a Rapidly Stabilizing Control Condition
To raPIly stabilize the control even if overshoot occurs, reduce integral time (I).
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.
Suppressing Short Cycle Vibration
If vibration occures, reduce the proportional gain (P) or increase the PI primary delay time parameter.
Setting Precautions
•
In PI control, the b5-04 parameter is used to prevent the calculated integral control value from exceeding a
specified amount. When the load varies rapidly, Inverter response is delayed and the machine may be dam-
aged or the motor may stall. In this case, reduce the set value to speed up Inverter response.
•
The b5-06 parameter is used to prevent the arithmetic operation following the PI control calculation from
exceeding a specified amount. Set taking the maximum output frequency to be 100%.
•
The b5-07 parameter is used to adjust PI control offset. Set in increments of 0.1%, taking the maximum
output frequency to be 100%.
Response
Before adjustment
After adjustment
Time
Response
Before adjustment
After adjustment
Time
Response
Before adjustment
After adjustment
Time