F606 fault in WEG CFW900 Drive indicates Power Monitor Communication is Lost. This means the main control board lost its data link with the internal power monitoring module.
Cause:
Communication fault between AUI and PMON.
- Defect on the inverter internal circuits.
- Electromagnetic interference above the level the inverter withstands.
- Power board turned off.
Remedy:
Verify internal power board status. Ensure proper connection cables are secure and grounding pathways are clear of noise interference.
