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.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

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

2. 4

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

3. 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.