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

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

Product Line:
ATV61

Environment:
All 

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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