Cause : Encoder feedback loss warning - Signal from Encoder lost; Inverter might have switched to sensorless vector control(check also alarm value r0949):

Diagnosis & Remedy Stop inverter and then
- Check encoder fitted. If encoder fitted and r0949 = 5, select encoder type via P0400.
- If encoder fitted and r0949 = 6, check connections between encoder module and inverter.
- If encoder not fitted and r0949 = 5, select SLVC mode (P1300 = 20 or 22).
- If encoder not fitted and r0949 = 6, set P0400 = 0.
- Check connections between encoder and inverter
- Check that encoder not faulty (select P1300 = 0, run at fixed speed, check encoder feedback signal in
r0061)
- Increase encoder loss threshold in P0492