90 · FC 301/302 · ALARM
For 90, model / series is FC 301/302; type is ALARM; brand is Danfoss; fault name is Feedback monitor; corrective action is Check the connection to encoder/resolver option and, if necessary, replace VLT® Encoder Input MCB 102 or VLT® Resolver Input MCB 103, verified against its source on 2026-10-10.
- Brand
- Danfoss
- Model / series
- FC 301/302
- Fault code
- 90 verified
- Fault name
- Feedback monitor verified
- Type
- ALARM verified
- Corrective action
- Check the connection to encoder/resolver option and, if necessary, replace VLT® Encoder Input MCB 102 or VLT® Resolver Input MCB 103. verified
What the source says
ALARM 90, Feedback monitor
— files.danfoss.com, retrieved 2026-09-01
Where each value comes from
The value above is stated away from the sentence quoted with the answer, so the passage that states it is shown here too.
Corrective action
Check the connection to encoder/resolver option and, if necessary, replace VLT® Encoder Input MCB 102 or VLT® Resolver Input MCB 103.
— all from files.danfoss.com, retrieved 2026-09-01
Source
- files.danfoss.comhttps://files.danfoss.com/download/Drives/MG33MO22.pdf