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What causes an INF6 fault on the ATV61 and ATV71 drives?

Issue: 
What causes an INF6 fault on the ATV61 and ATV71 drives? 

Product Line:
Altivar ATV61 and ATV71

Environment:
All products

Cause:
The control terminal pod/block may be loose or there may be (2) serial communication cards installed at once.

Resolution: 
INF6 is an internal option fault.  Basically, the option card installed on the VFD is not recognized.
First, reseat the control terminal pod.  Then, check the 1.11 Identification menu for option 1 and option 2 to see if there are 2 conflicting option cards installed.
 
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