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Why is the ATV31 HMI display freezing when changing bFr on the HMI?

Issue:
Why does the drive HMI freeze when trying to change 'bFr' (Standard motor frequency)?

Product Line:
ATV31

Environment:
All serial numbers

Cause:
Can't change bFr to 60hz. 

Resolution:
Cycle power to clear the drive state. 
Perform a factory reset (FCS)  to clear any incompatible issues.
Set bFr (d rC menu) 
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