Overcurrent

What does OC mean?

This fault indicates that the inverter's output current has exceeded its safe operating limit, often due to a sudden increase in motor load, a short circuit in the motor wiring, or rapid acceleration. Excessive current can damage the inverter's power components (IGBTs) and the motor windings if sustained. It triggers a protective shutdown to prevent hardware failure.

Complete Troubleshooting Guide

1. 1

   Check for mechanical overload on the motor or driven equipment. Reduce load if necessary.

2. 2

   Inspect motor and cable insulation for short circuits between phases or to ground. Measure motor phase resistance.

3. 3

   Verify the motor parameters set in the inverter match the actual motor nameplate data.

4. 4

   Increase acceleration/deceleration times (parameters C1-01 / C1-02) if the fault occurs during speed changes.

5. 5

   Check for proper sizing of the inverter relative to the motor and application.