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.
If this article does not answer your question, check out our FAQ database that has answers to more commonly asked questions:
Frequently Asked Questions - Schneider Electric (se.com)
If this FAQ did not solve your issue, you can call us at 1-888-778-2733 Option 2 and then 4 or e-mail us atdrive.products.support@se.comto create a case with our Technical Support Team.
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Released for: Schneider Electric Canada
