Applicable Systems
MicroFlex
Symptoms
The MicroFlex reports a main contactor fault. The main contactor failed to close or open as expected during the power-on sequence.
Possible Causes
- Main contactor coil failure or control circuit fault
- Contactor contacts welded or excessively worn
- Contactor control wiring loose or disconnected
Troubleshooting Steps
- Step 1: Check the contactor coil voltage and continuity in the drive
Coil receives correct voltage and has proper resistance - Step 2: Inspect the contactor contacts for welding or excessive wear
Contacts are clean and make proper contact - Step 3: Verify the contactor control wiring is intact and connected
Control wiring is properly connected
How to Reset
To reset: Fix or replace the main contactor, then reset and restart.
Source: Baldor MicroFlex Drive Manual, Baldor Electric Company/ABB
Category: PLC & VFD