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What causes a 4-20mA loss (LFF) on an ATV312 drive?

Published date: 30 October 2018

Issue:
What causes a 4-20mA loss (LFF) on an ATV312 drive?

Product Line:
Altivar 312

Environment:
All

Cause:
Loss of 4-20mA on AI3.

Resolution:
This will happen if the LFF is programmed to a function other than ignore (no).
If it is programmed to a function other than no, then the drive is designed to have a value of 4 mA minimum (unless CRL3 is changed to 0 instead of 4A) on AI3 input.  

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