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What would cause the ATV66 drive to just shut down with no fault?

Issue:
What would cause the ATV66 drive to just shut down with no fault?

Product Line:
Altivar ATV66, ATV56, 66U and 56U

Environment:
All

Cause:
The drive is stopping and shutting down without showing any faults on the display.

Resolution: 
1st check the drives status in the bottom right hand side of the HMI.  What is the status? RDY, NRP,
 
If the drives status is RDY then we need to check the drives run signal on LI2 for 2 wire control.
If the drives status is NRP then we need to check the run premissives input on LI1.
You can monitor the status of the logic inputs in menu 2.1.
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