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What causes the fan control board relay clicking on and off on high HP ATV61/71 drives?

Issue:
The fan control board relay is clicking on and off on high HP ATV61/71 drives

Product Line:
ATV61 ATV71

Environment:
All serial numbers

Cause:
Fan control board relay is clicking.

Resolution:
Fan control board is clicking.
Check your 3 phase 480vac on X1 terminal of the fan control board. 
Swap X1 and X4 to see if there is an external supply being applies to RO SO TO.
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