Applicable Systems
FC-30
FC-51
FC-101
FC-202
FC-302
Symptoms
Loss fault: motor feedback signal lost.
Possible Causes
- Motor feedback cable broken
- Feedback sensor failure
- Signal interference
Troubleshooting Steps
- Step 1: Check feedback cable continuity
Cable intact - Step 2: Verify feedback sensor operation
Sensor outputs correct signal - Step 3: Eliminate EMI sources near cable
No signal interference
How to Reset
Reset via control panel after restoring feedback signal.
Source: Danfoss VLT FC-302 Operating Guide, Danfoss A/S
Category: PLC & VFD