Cause : Over-current during steady operation comes when the current flowing from the drive to the motor has exceeded the set limit while the motor is running at a constant speed.

The ocn error code on your Delta MS300 drive indicates an Over-current During Steady State Operation condition. This means the current flowing from the drive to the motor has exceeded the set limit while the motor is running at a constant speed.

1. Check the motor cable and remove causes of the short circuits, or replace the cable before turning on the power.
2. Check the motor insulation value with megger. Replace the motor if the insulation is poor.
3. Increase the AC motor drive’s capacity.
4. Reduce the load or increase the capacity of AC motor drive.