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.

Additional Steps

Steps 1–2 are listed in Priority Fix.

  1. 3

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

  2. 4

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

Source: Schneider Electric Altivar Machine ATV320 Variable Speed Drive
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