46 · FC 301/302 · ALARM
For 46 · FC 301/302 · ALARM, brand is Danfoss; model / series is FC 301/302; fault code is 46; fault name is Power card supply; type is ALARM, verified against its source on 2026-09-01.
- Brand
- Danfoss
- Model / series
- FC 301/302
- Fault code
- 46 verified
- Fault name
- Power card supply verified
- Type
- ALARM verified
- Cause
- The supply on the power card is out of range. Another reason can be a defective heat sink fan. There are 3 supplies generated by the switch mode supply (SMPS) on the power card: • 24 V. • 5 V. • ±18 V. When powered with VLT® 24 V DC Supply MCB 107, only the 24 V and 5 V supplies are monitored. When powered with 3-phase mains voltage, all 3 supplies are monitored. verified
- Corrective action
- • Check for a defective power card. • Check for a defective control card. • Check for a defective option card. • If a 24 V DC supply is used, verify proper supply power. • Check for a defective heat sink fan. verified
What the source says
ALARM 46, Power card supply
— files.danfoss.com, retrieved 2026-09-01
Where each value comes from
This source states these in separate places, so each value is shown with the passage that states it.
Cause
The supply on the power card is out of range. Another reason can be a defective heat sink fan. There are 3 supplies generated by the switch mode supply (SMPS) on the power card: • 24 V. • 5 V. • ±18 V. When powered with VLT® 24 V DC Supply MCB 107, only the 24 V and 5 V supplies are monitored. When powered with 3-phase mains voltage, all 3 supplies are monitored.
Corrective action
• Check for a defective power card. • Check for a defective control card. • Check for a defective option card. • If a 24 V DC supply is used, verify proper supply power. • Check for a defective heat sink fan.
— all from files.danfoss.com, retrieved 2026-09-01
Source
- files.danfoss.comhttps://files.danfoss.com/download/Drives/MG33MO22.pdf