Applicable Systems
FC-30
FC-51
FC-101
FC-202
FC-302
Symptoms
Main power phase loss detected on input.
Possible Causes
- Missing input phase
- Input fuse blown
- Loose input connection
Troubleshooting Steps
- Step 1: Measure all three input phase voltages
All phases present and balanced - Step 2: Check input fuses
All fuses intact - Step 3: Inspect input cable connections
All connections tight
How to Reset
Reset via control panel or auto-reset after mains restored.
Source: Danfoss VLT FC-302 Operating Guide, Danfoss A/S
Category: PLC & VFD