What is an EEF1 (EEPROM Control fault) on the ATV600 Process drives?

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Issue:
What can cause an EEF1 EEPROM Control fault on the ATV600 Process drives?

Product Line:
Altivar Process ATV600 series

Environment:
All

Cause:
An error of the internal memory of the control block has been detected.

Resolution:
Cycle power on the VFD to clear the fault.
If it does not clear:
Save a copy of the program in the keypad display.
Reset the drive to factory settings for Parameter Group Lists = All.
If the fault does not clear, the control block needs to be replaced.