Short Circuit Inverter at Start

What does OCA mean?

This fault indicates a short circuit condition detected within the Altivar 212 drive's output inverter stage during motor startup, usually caused by a ground fault.

• Ground fault in the inverter output or motor/cables.

Click steps to track your progress.

1. 1

   Use a 1000 V testing tool (megger) to check the motor windings for insulation resistance to ground.

2. 2

   Use a 1000 V testing tool (megger) to check the motor cables for insulation resistance to ground.