Overcurrent

What does OCF mean?

An overcurrent condition has been detected, which can be caused by incorrect drive parameters, excessively high inertia or load, or a mechanical locking of the motor. This fault protects both the motor and drive from damage due to excessive current draw.

• Motor shaft mechanically locked or seized, causing the motor to draw excessive current.
• Drive motor parameters (e.g., P0-02 Motor Current, P0-03 Motor Voltage) are incorrectly entered or mismatched.
• Short circuit or insulation breakdown in the motor windings or motor output cables (U, V, W).
• Excessive load transient applied to the motor exceeding the drive's current limit.
• Drive's current control loop or current sensing circuit malfunction.

Click steps to track your progress.

1. 1

   1. Disconnect the motor from its mechanical load and attempt to run the motor unloaded to isolate the issue.

2. 2

   2. Verify all motor nameplate data (Voltage, Current, RPM, Hz) matches the drive's motor parameters (P0-02 to P0-05).

3. 3

   3. Measure the resistance between each motor phase winding (U-V, V-W, W-U) and from each phase to ground (PE) for shorts.

4. 4

   4. Visually inspect the motor power cables from the drive's output (U, V, W) to the motor for insulation damage or shorts.

5. 5

   5. Reduce the acceleration ramp time (P1-11) or verify current limits (P1-08) are appropriate for the application.