Motor disconnect

What does A784 mean?

The drive has detected that all three output phases are disconnected from the motor. This can occur due to an open motor circuit, open switches, or faulty cabling, preventing the drive from controlling the motor and potentially causing damage to the drive if it attempts to operate into an open circuit.

Complete Troubleshooting Guide

1. 1

   Verify if parameter 95.26 is configured to enable a motor disconnect switch; if so, ensure the switch is closed.

2. 2

   Ensure all external switches or contactors between the drive and motor are in a closed state.

3. 3

   Inspect all cables and connections between the drive and motor for continuity, secure termination, and damage.

4. 4

   If connections appear sound, contact ABB support as there might be an internal drive issue or misdetection.