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What is EEF1 fault on Altivar 71 drive.

EEF1 is a control EEprom Fault and at starting, the microprocessor on the application board tries to read and write to the EEPROM. If it is impossible, the drive trips in EEF1 fault.

Probable causes:
Internal memory failure.

- Check the environment (electromagnetic compatibility).
- Switch off / on the drive, return to factory settings.
- Change the control block.
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