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Anonymous Poster #1

UPS Issue

10/21/2012 4:33 AM

I was working on 100KVA UPS( BPC Brand) and anytime it switches to inverter mode, the contactor opens immediately in a matter of second displaying overcurrent. i have taken my time to replace virtually all the boards but this kept repeating itself. what could be responsible for this and what is the way forward?
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Joshi
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Join Date: Oct 2007
Location: India
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#1

Re: UPS Issue

10/21/2012 5:31 AM

Measure the full load KVA. It may be more.Then, shed some non critical load, then try your UPS inverter. If you still find overcurrent operating, then you have to troubleshoot/calibrate/evaluate your overcurrent circuit.
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Sapper
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Join Date: Dec 2007
Location: Sydney Australia
Posts: 480
Good Answers: 35
#2

Re: UPS Issue

10/22/2012 5:58 PM

Check you load..

A high current, leading power factor or high harmonics can cause the unit to trip.

At 100kVA I would expect that the UPS is a three phase unit, so check the load balance, this will also likely cause a trip.

What is the load?

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Sapper

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