Cause : Auto-tuning error comes when the drive attempts to automatically calibrate itself to optimize performance for the connected motor, but the process fails to complete successfully.

The AUE error code on your Delta MS300 drive indicates an Auto-tuning error. Auto-tuning is a process where the drive automatically adjusts its internal parameters to optimize performance for the connected motor. An AUE error signifies that the auto-tuning process failed to complete successfully.

1. Re-execute auto-tuning.
2. Check motor capacity and related parameters.
3. Set the correct parameters, that is Pr.01-01–Pr.01-02.
4. Set Pr.01-00 larger than the motor rated frequency.
5. Check the wiring.