27 · FC 301/302 · WARNING/ALARM
For 27, model / series is FC 301/302; type is WARNING/ALARM; brand is Danfoss; fault name is Brake chopper fault; corrective action is • Remove power to the frequency converter and remove the brake resistor, verified against its source on 2026-10-10.
- Brand
- Danfoss
- Model / series
- FC 301/302
- Fault code
- 27 verified
- Fault name
- Brake chopper fault verified
- Type
- WARNING/ALARM verified
- Cause
- The brake transistor is monitored during operation, and if a short circuit occurs, the brake function is disabled, and a warning is issued. The frequency converter is still operational, but since the brake transistor has short- circuited, substantial power is transmitted to the brake resistor, even if it is inactive. verified
- Corrective action
- • Remove power to the frequency converter and remove the brake resistor. verified
What the source says
WARNING/ALARM 27, Brake chopper fault
— 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 brake transistor is monitored during operation, and if a short circuit occurs, the brake function is disabled, and a warning is issued. The frequency converter is still operational, but since the brake transistor has short- circuited, substantial power is transmitted to the brake resistor, even if it is inactive.
Corrective action
• Remove power to the frequency converter and remove the brake resistor.
— all from files.danfoss.com, retrieved 2026-09-01
Source
- files.danfoss.comhttps://files.danfoss.com/download/Drives/MG33MO22.pdf