Overtorque 2 Fault

What does OL4 mean?

This fault indicates that the motor load has exceeded the configured Overtorque 2 detection level (L6-05) for the set duration (L6-06). Similar to OL3 but using a secondary profile, it triggers based on L6-04 settings, causing the drive to shut down. This points to a mechanical obstruction, jamming, or excessive resistance in the driven equipment. If persistent, this can lead to motor and drive damage or mechanical failure of the connected machinery.

• Intermittent or transient mechanical overload on the driven equipment, exceeding the secondary overtorque threshold (L6-05).
• Incorrect configuration of L6-05 (Overtorque 2 Detection Level) or L6-06 (Overtorque 2 Detection Time), potentially set too low or too short for specific operating conditions.
• Application requiring high starting torque or rapid acceleration that momentarily exceeds the OL4 trip limits, even if normal running torque is acceptable.
• Degradation of mechanical components (e.g., worn bearings, misalignment) leading to increased friction and torque demand over time.

Click steps to track your progress.

1. 1

   Review machine operational logs for correlation between OL4 faults and specific load events (e.g., material feeding, sudden acceleration) or process stages.

2. 2

   Using a power meter, measure the actual mechanical power output and motor current during the application's most demanding conditions.

3. 3

   Adjust parameter L6-05 (Overtorque 2 Detection Level) to a value slightly above the peak transient operating current, or increase L6-06 (Overtorque 2 Detection Time) if momentary spikes are expected.

4. 4

   Perform a current signature analysis on the motor to detect early signs of mechanical wear or motor winding degradation.

5. 5

   Check for correct motor parameters (E1-01, E1-02, E1-03) and ensure the auto-tuning process has been successfully completed, providing accurate motor model data.