Cause : Under current comes when the drive is detecting that the current flowing to the motor is lower than expected during operation.

The uC error code on a Delta MS300 drive indicates a general undercurrent fault due to improper setting of low-current protection.

1. Troubleshoot the connection between the motor and the load.
2. Reset Pr.06-71, Pr.06-72 and Pr.06-73 to proper settings.
3. Check the load status.
4. Check if the motor capacity matches the load.