Overcurrent during Deceleration

What does E.OC3 mean?

The inverter output current has exceeded approximately 230% of its rated value during deceleration, causing the protection circuit to activate and shut off the inverter. This can be caused by sudden speed reductions, an output short-circuit, or issues with the mechanical brake. Unresolved, it can lead to component stress and potential damage.

Complete Troubleshooting Guide

1. 1

   Increase the deceleration time setting in the inverter parameters.

2. 2

   Inspect the output wiring for any short circuits and verify the proper operation of the motor's mechanical brake.

3. 3

   Adjust the stall prevention operation level (lower it) and ensure the fast-response current limit operation is activated.

4. 4

   Confirm that the inverter capacity is appropriately matched to the motor capacity.

5. 5

   For PM sensorless vector control, ensure a start command is issued only after the motor has stopped, or utilize the automatic restart/flying start function.