Causes

Possible Solutions

E5-01 [PM Motor Code Selection] is set incorrectly.

Refer to “Motor Performance Fine-Tuning” in the technical manual.

The drive is operating the motor at more than the specified speed control range.

Examine the speed control range and adjust the speed.

The motor is hunting.

Adjust these parameters to have the largest effect:

  • n8-55 [Motor to Load Inertia Ratio]

  • n8-45 [Speed Feedback Detection Gain]

  • C4-02 [Torque Compensation Delay Time]

Hunting occurs at start.

Increase the value set in C2-01 [S-Curve Time @ Start of Accel].

Too much current is flowing through the drive.

Set E5-01 [PM Motor Code Selection] correctly as specified by the motor. For special-purpose motors, enter the correct value to E5-xx as specified by the motor test report.

Operation is not stable when n8-57 = 1 [HFI Overlap Selection = Enabled].

  • Do High Frequency Injection Auto-Tuning.

  • Decrease the value set in n8-41 [HFI P Gain] in increments of 0.5.

    Note:

    Set n8-41 > 0.0 for IPM motors.