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How to check a UPS step-up transformer

I have a cooper lighting inverter used for emergency lighting systems.I want to know how can i check the inverter step-up transformer whether it is ok or not, because the mosfets are bursting even after changing new ones including the driver ics and other components. i want to know how i can test the transformer whether it will be ok or not.

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Check these videos Amar.

Posted on May 10, 2014

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Hello, I recently picked a MGE Evolution 850 UPS from an abandoned facility, I brought it home, and I left it charging for about 4 hours. However, when I pressed the power button, nothing happened, no


Firstly, isolate the troubled area by inputting battery equivalent healthy voltage from any suitable DC source. If inverter works, then the problem is in battery, if it doesn't, check the transformer and output transistors of the inverter.

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APC 800 VA trouble shooting Manual/ Guide


Check the connection wires to the battery - are they loose?
Use a car headlamp check whether your battery can light it up. Usually UPS battery goes bad after a couple of years.

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Hi Edi, try to check the output relay of your UPS it might be stuck, thats always the case or sometimes the transformer.

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I have some liebert ups 6kva i have problem in charger circuit i find transistor 13n80 have a short circuit i replace it and replace fuse in charger board 6.3a but there still problem in charging batteries...


Hi, Thanks for contacting fixya. There could be many reasons.

1. The battery is old and completed its charge-discharge cycle.
2. The step down transformer (220/110V to 12/24V) coils got shorted inside.
3. For a trickle charger, the SCR might have gone bad.

Solution for 1. Take out the battery and charge it by another charger. You can use laptop charger, cell phone charger or any charger. You might have to do a little bit circuitry. Then after 2-3 hrs of charging see if the battery voltage goes to its peak. Use a voltmeter or multimeter to measure that. If the voltage does not goes to its peak then battery is faulty. And the charger circuit has no problem.

Solution for 2. Some times step down transformer goes wrong. Measure the output voltage by a multimeter and see if it is giving the voltage what it should be. If not then change the transformer.

Solution for 3. I don't know how to determine if an SCR is wrong. The easiest way to check is to replace it and see if the battery is changing.

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Hello!! my boss would like something that will back this up incase the power went out he would be able to use his computer for atleast 2 hours


no that is impossible because inverter transformer is so weak and not able to tolerate the heat and heatsink of mosfet is also very small and unable to dissipate the heat for long time you have to purchase LTmodel(long time backup)ups

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I have a ups system that i am feeding with 240 vac phase to phase and both phase to ground readings are 120 vac but when i go to battery power i get 240 vac phase to phase and 1 phase to ground i get 220...


No, I don't think there is anything wrong. Your UPS seems to have a single phase 240V output, which seems to be "floating" (no or only a weak ground reference).
Just be aware that you can only power 240V equipment from it. If you need 120V for some devices _and_ if the UPS provides sine wave output, you could use a step down transformer for this purpose.

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check the inverter transformer and it i/p voltage if proper then replace inverter transformer

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Test/Troubleshoot APC Battery Backups


All batteries, old or not really used hard should be replaced every three years. If not they turn to acid, or blister. If bllister does occur, throw the unit away, most likely the inverter will not last very long after the new batter is installed.

To know if your UPS is working right even if the battery might check out, use a volt meter to see if the battery is 12.5 to Volts. If you have a ceramic 10 ohm resister, you can alagator clip it across the + & - and it should hold the voltage above 12V DC, but if it sinks real quick below that...that battery is done.

To check to see if your UPS is OK. Plug it in use the volt meter to check the output voltage. Should be 115V-120V AC, unplug the plug from the wall socket and the readings should be hovering around 118V AC. That means your Inverter is still working. If the UPS dies, two things, go check the battery, or the inverter is toast-Throw away the Unit buy another. May I suggest that since CPU's are getting more advanced and faster and new computer power supplies are getting bigger go bigger on the UPS. Start out with a 1000VA or standardize on 1500VA. They really are not too expensive like they use to be.
check out my web page, should give you an idea.... http://www.storminprotection.com

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keep on your main switch. off all the lights fan and other electrical items, let that inverter get charge first

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