Friday, April 22, 2011

Re: Shutdown stsetch2 SNF 2011-04-20 23:32:38: Roughing valve won't close

Found the devicenet module #4 circuit breaker had tripped.
The root cause was a loose wire in the roughing valve position switch. The wire shorted to ground which kicked off the breaker. The position switch was assembled from the factory with one missing screw. This cause the whole assembly to move whenever the valve is actuated. This movement caused the eventual breakage of the wire.

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