Cause : Over torque 1 comes when the motor connected to the drive has exceeded the set torque limit for a certain period.

The ot1 error code on your Delta MS300 drive indicates an over-torque condition. This means the output current exceeds the over-torque detection level (Pr.06-07) and exceeds over-torque detection time (Pr.06-08), and when Pr.06-06 or Pr.06-09 is set to 2 or 4, the ot1 error displays.

1. Configure the settings for Pr.06-07 and Pr.06-08 again.
2. Reduce the load.
3. Replace the motor with a larger capacity model.
4. Increase the setting values for Pr.01-12–Pr.01-19 (accel./decel. time).
5. Adjust the torque compensation (refer to Pr.07-26 torque compensation gain) until the current reduces and the motor does no stall.