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

Published date: 22 February 2019

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

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All serial numbers

Fan control board relay is clicking.

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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