Cause : Over-torque 4 warning comes when the motor connected to the drive has exceeded the set torque limit for a certain period.

The ot4 error code on your Delta MS300 drive indicates an Over-torque Warning Level 3. This error signifies that the motor's torque has exceeded a over-torque limit.

1. When the output current < Pr.14-78, the Ot4 warning automatically clears.
2. When the output current < Pr.14-79, the Ot4 warning automatically clears.
3. Configure the settings for Pr.14-78 and Pr.14-79 again.
4. Increase the setting values for Pr.01-12–01-19 (accel./ decel. time).
5. Decrease the loading during low-speed operation.