Applicable Systems
FC-30
FC-51
FC-101
FC-202
FC-302
Symptoms
Brake chopper fault detected.
Possible Causes
- Brake chopper IGBT failure
- Brake resistor open circuit
- Chopper control circuit fault
Troubleshooting Steps
- Step 1: Check brake resistor continuity
Resistor within rated value - Step 2: Inspect brake chopper IGBT
IGBT not shorted - Step 3: Verify chopper control circuit
Control signal present
How to Reset
Reset via control panel after chopper repair.
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Source: Danfoss VLT FC-302 Operating Guide, Danfoss A/S
Category: PLC & VFD
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