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What does an EEF1 fault on an Altivar Process Drive mean?

Published date: 27 August 2019

How do I troubleshoot an EEF1 fault on a Process Drive?

Product Line:
Altivar 6xx and 9xx Process Drives 


An error of the internal memory of the control block has been detected.

Verify the environment (electromagnetic compatibility).
This detected error requires a power reset. Remove line voltage until the display goes all the way out. Then reapply line voltage.
If cycling line voltage doesn't clear the fault, save your programming in the keypad or SoMove, and perform a factory reset
After factory reset cycle line voltage again. 
If the fault remains, drive replacement is required.

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