Troubleshooting
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If There is Mechanical Oscillation
Use the following information when there is machanical vibration:
Oscillation and hunting occur with Open Loop Vector control.
The torque compensation parameter settings may be incorrect for the machine. Adjust parameters C4-01
(Torque Compensation Gain), C4-02 (Torque Compensation Delay Time Parameter) and C3-02 (Slip Com-
pensation Delay Time) in order. Lower the gain parameters and raise the delay time parameters.
If auto-tuning has not been performed, proper perfomance may not be achieved for Vector Control. Perform
auto-tuning or set the motor parameters through hand calculations. Alternatively, change the Control Mode
Selection to V/f Control (A1-02 = 0 or 1)
Oscillation and hunting occur with Closed Loop Vector control
The gain adjustment may be insufficient. Adjust the speed control loop (Automatic Speed Regulator, ASR) by
changing C5-01 (ASR Proportional Gain). If the oscillation points overlap with those of the machine and can-
not be eliminated, increase the ASR Delay Time, and then readjust the ASR gain (C5-01)
If auto-tuning has not been performed, proper performance may not be achieved for Closed Loop Vector Con-
trol. Perform auto-tuning or set the motor parameters through hand calculations.
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