Overtorque Detection 1

What does OL3 mean?

The Drive output current exceeded the threshold set in L6-02 for longer than the time set in L6-03, indicating a motor overload condition. This fault protects the motor and mechanical system from damage due to excessive load.

• Mechanical binding or jamming in the driven load, causing excessive motor torque demand.
• Incorrectly set L6-02 (Overtorque Detection Level) parameter, leading to premature tripping.
• Motor shaft or gearbox bearing failure increasing frictional losses in the mechanical system.
• Excessive external load applied to the motor beyond its continuous operating capacity.
• Damaged or improperly sized motor for the application, unable to handle peak torque requirements.

Click steps to track your progress.

1. 1

   1. Measure motor current at U, V, W terminals with a clamp meter and compare to the value set in E2-01 (Motor Rated Current).

2. 2

   2. Inspect the mechanical system (e.g., conveyor, pump, fan) for obstructions, seizing bearings, or misalignments.

3. 3

   3. Verify L6-02 (Overtorque Detection Level) and L6-03 (Overtorque Detection Time) parameters are set appropriately for the application.

4. 4

   4. Check motor winding resistance (U-V, V-W, W-U) with a multimeter for imbalances or open circuits.

5. 5

   5. If continuous overtorque is detected, reduce process load or consider upsizing the motor/drive system.