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Video: What causes an LFF3 fault code on the ATV320 drive?

Published date: 05 September 2018

Issue:
What causes an LFF3 fault code on the ATV320 drive?

Product Line:
Altivar 320, ATV320

Environment:
All Models

Cause:
Troubleshooting an LFF3 fault code

Resolution:
This fault indicates that the 4-20mA reference on Ai3 and COM is not being seen as expected.
If this function is programmed in error, you can disable it by going to CONF->FULL->I/O. 
Here you will have menus A1C-, A2C-, and A3C-.  These are alarm group 1 - 3 definition parameters.
One of them must be programmed as AP3 as AP3 is an alarm indicating the absence of 4-20mA signal on input AI3.
These can always be unassigned to disable this function if not needed.

 

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