8 · FC 301/302 · WARNING/ALARM
For 8 · FC 301/302 · WARNING/ALARM, brand is Danfoss; model / series is FC 301/302; fault code is 8; fault name is DC under voltage; type is WARNING/ALARM, verified against its source on 2026-09-01.
- Brand
- Danfoss
- Model / series
- FC 301/302
- Fault code
- 8 verified
- Fault name
- DC under voltage verified
- Type
- WARNING/ALARM verified
- Cause
- If the DC-link voltage drops below the undervoltage limit, the drive checks for 24 V DC back-up supply. If no 24 V DC back-up supply is connected, the drive trips after a fixed time delay. The time delay varies with unit size. verified
- Corrective action
- • Check that the supply voltage matches the drive voltage. • Perform an input voltage test. • Perform a soft-charge circuit test. verified
What the source says
WARNING/ALARM 8, DC under voltage
— 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
If the DC-link voltage drops below the undervoltage limit, the drive checks for 24 V DC back-up supply. If no 24 V DC back-up supply is connected, the drive trips after a fixed time delay. The time delay varies with unit size.
Corrective action
• Check that the supply voltage matches the drive voltage. • Perform an input voltage test. • Perform a soft-charge circuit test.
— all from files.danfoss.com, retrieved 2026-09-01
Source
- files.danfoss.comhttps://files.danfoss.com/download/Drives/MG33MO22.pdf