Frequently asked questions
What can cause an EEF1 control EEPROM fault on the ATV61 and ATV71 drives?
10 June 2022
EEF1 control eeprom fault on an Altivar ATV61 ATV71
Altivar drives ATV61 and ATV71
Internal memory fault on the control board.
EEF1= Control EEPROM fault.
Save a copy of the program in the keypad display 1st
Try resetting the drive back to a factory default to see if the fault will clear.
If the fault does not clear you will need get the drive repaired or try to replace the main control board.