Output Contactor Stuck Closed

What does FCF1 mean?

Indicates that the output contactor is detected as stuck in the closed position when it should be open. This is a critical safety fault, as power may still be applied to the motor when it should be disconnected, leading to uncontrolled startup or dangerous conditions.

Complete Troubleshooting Guide

1. 1

   Immediately verify that all power to the drive and motor is disconnected for safety.

2. 2

   Inspect the output contactor for welded contacts, pitting, or mechanical sticking.

3. 3

   Manually actuate the contactor to check for free movement and reliable opening.

4. 4

   Measure continuity across the contactor terminals to confirm its open state when de-energized.

5. 5

   Replace the faulty output contactor if it fails to open reliably.