What does the EEF1 (EEPROM Control Fault) mean on an ATV600 and ATV900 process drive, and how do I fix it?

An EEF1 fault on an ATV600 and ATV900 series process drive indicates a problem with the drive’s EEPROM (control memory).

Resolution Steps

1.-Power-cycle the drive
Turn the VFD off, wait a few seconds, and power it back on to see if the fault clears.

2.-Back up the configuration
If the fault remains, use the keypad display to save a copy of the current program.

3.-Restore factory settings
Reset the drive to factory defaults by setting Parameter Group Lists = All, then reapply power.

4.-Replace the control block if needed
If the EEF1 fault persists after a factory reset, the control block is likely defective and must be replaced.

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