EEF1

Control EEPROM Error

Schneider Electric · Altivar Machine ATV320 Variable Speed Drive

What does EEF1 mean?

A detected error within the Control EEPROM. This non-volatile memory stores critical drive parameters and firmware. Corruption here can prevent the drive from booting, operating, or retaining its configuration, leading to a complete system failure.

Complete Troubleshooting Guide

  1. 1

    Attempt to re-upload the drive's configuration parameters from a known good backup.

  2. 2

    Perform a factory reset and carefully reconfigure the drive.

  3. 3

    If the fault persists, the control board may be damaged and require replacement.

  4. 4

    Check for unusual power supply fluctuations that might cause memory corruption.

Source: Schneider Electric Manual