EEr
Message No. 0091
Parameter & program
EEPROM error
What does it mean?
Fault while reading / writing the internal EEPROM.
Common causes
- Internal EEPROM fault — often after a sudden power loss or ageing EEPROM.
How to fix it
- Restore the parameter set (C0003 = 1)
- if it recurs, the drive needs a workshop inspection — send it to us.
After troubleshooting: de-energise the device completely (disconnect the 24 V supply and discharge the DC bus) before opening the covers.