UPS Galaxy3000 20KVA Problem

Please give the phase and line voltages of 3 phases. and also furnish the tolenrance what you set. don;t look at the IGBT first, as the chance of IGBT failure is very less.there may be problm with the measuring PT s or the set points or voltage calibration errors.

Please come up with the above details, so that we can give support to sot out

Regards

anand.mandarapu

Phase 1- 222V

Phase 2- 223V

Phase 3- 224V

I don't no how to check and set the tolerance.About two months ago it is working ok I kept it off, now when I turn on the UPS it is showing this fault. nothing is changed

Thanks.

<...don't know how to check and set the tolerance...>

It will be found within the manufacturer's user manual supplied with the equipment.

There are a couple of items I would be checking:-

These UPSs have a Load Balance Tracking system, Check the current (Amps) on each phase, they should be within +/-8% of each other.
Quite often this is a problem on a lightly loaded UPS as it does not take much to exceed the set threshhold.

Next get the Inverter stack checked as a single failed unit in a modular set will also cause this error.

Next Step is to contact APC who now own MGE.

Regards,
Sapper

how to check the inverter as in inverter there are IGBTs BSM35GD120DN2E3224 how to check it individually with multimeter