Overcurrent During Constant Speed

What does E.OC2 mean?

This fault occurs when the inverter's output current reaches or exceeds approximately 230% of the rated current while operating at a constant speed. This activates the protection circuit, causing the inverter output to shut down. Common causes include sudden load changes, output short-circuits, or incorrect control parameters. Repeated overcurrent can lead to motor and inverter damage.

Complete Troubleshooting Guide

1. 1

   Ensure stable load conditions; investigate and eliminate sources of sudden load changes.

2. 2

   Thoroughly inspect the output circuit wiring for any short-circuits or ground faults between phases or to earth.

3. 3

   Lower the stall prevention operation level or activate the fast-response current limit operation in the inverter parameters.

4. 4

   Verify that the inverter and motor capacities are properly matched for the application.

5. 5

   For PM sensorless vector control, ensure the motor has come to a complete stop before issuing a start command, or utilize the automatic restart/flying start function.