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 drive indicates an Over-torque Warning Level 3. This error signifies that the motor's torque has exceeded a over-torque limit.

1. Increase the setting values for (accel./ decel. time).
2. Decrease the loading during low-speed operation.