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Thread: Mcb keeps tripping, Why? Help!
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11-02-2010, 01:18 PM #1
Mcb keeps tripping, Why? Help!
Hi All,
I have been working on a heat pump package unit that keeps tripping out the main c5o amp 3 phase circuit breaker, and I am struggling to find out why.
It only happens usually when on full demand for a couple of hours, its not over load its going out on short circuit because I monitored my clamp meter while it did it.
I first suspected the bearings in one of the motors were getting hot and ceasing up but I have observed most of the fans and they all seem to be spinning freely just before it trips.
I think the most logical explanation would be maybe a cable is chaffing somewere? and the fact when it is on full load vibration speeds it all up.
I will megger the cable from the unit back to the board as a next precaution but any help shared would be very gratfefully recieved!
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