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Powerware 9125 makes the circuit breaker trips out

Hi all, I have a POWERWARE 9125 which badly fails: when I turn it on, it makes the circuit breaker to trip. I tries with and without the battery. If I charge the battery using a second 9125, the first powerware is able to generate the output voltage. But as soon as I turn the main voltage on, the main power circuit trips :-( I familiar with 8/16/32 bits MCU, memory buses... but not with hig current systems! So any help will be welcomed. Thanks & best regards. JM

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Posted on Jan 02, 2017

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SOURCE: I am looking for schematics for a Powerware 9125

This may not help, but it is the best I can find:

Posted on Mar 11, 2010

Testimonial: "Thanks for the lead, but no schematics there, really appreciate the rapid response."

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Posted on Sep 16, 2010

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SOURCE: Hello, my Powerware 3105 beeps

Your problem is showing up under the Powerware 9305 (a very large UPS) but your comments are about the 3105. It sounds like your battery is dead. If your UPS is over 3-5 years old, that's most likely the case. The website address to view the user manual is You can contact Eaton directly, too. Eaton bought Powerware about 6 years ago. Here's the contact info. Be sure to have your serial and model numbers ready from the rating label on your UPS.

Toll Free: 1 800 356 5737

Posted on Dec 17, 2010

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SOURCE: Battery Packs for Powerware 9355 UPS

If you battery packs are all at 130volts DC, then all of the packs will have become dead, and the batteries are not recoverable. Your battery DC bus voltage on a Powerware 9355 20 to 40kVA rated UPS is nominal 432 volts DC - 36 batteries in series in each string at 12 volts DC per battery. If batteries go below 10.5 volts DC each, or 378 volts DC bus voltage, no amount of charging will recover these batteries. You should not be recycling the DC battery breaker, unless you felt the battery breaker was faulty. The UPS would have given you an alarm message of either battery breaker Off, Charger Failure, or Low DC Bus Voltage long before the these batteries failed.
The battery test will not proceed if the batteries are dead.

Posted on Feb 11, 2011

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9390 Requires a UVR type battery breaker. Unfortunately a configuration error will require a service visit from a technician. The proprietary service software will have to be used to reset this.

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We had a power outage for about 45 minutes a few days ago. Ever since then the Powerware 3110 has been beeping. I turned it off and left it plugged in overnight and when I turned it back on the beeping...

This could be several things, fortunately the device should actually be helping you to diagnose the issue. There are different beeps for different issues. They are as follows:

1 Beep Every 5 Seconds = Power Outage\Loose Plug Connection\Tripped Circuit Breaker\Power Cord Damage or Failure

2 Beeps Every 5 Seconds = Low Battery Alarm

3 Beeps Every 5 Seconds = Battery Needs Charging\Service\Replacement

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Continuous Beep = Short Circuit / Input Voltage out of Range / UPS Fault (Likely replacement of entire unit)

That should help diagnose the actual issue. If it turns out the battery needs to be replaced they can be found online for around $20. A simple google search for Powerware 3110 Battery should return what you're after. Good luck!

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I, Bypass battery and nomral mode are blinking UPS bypass unavailable. I need help please

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Mar 01, 2011 | Powerware 9125 UPS System

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Powerware 9120 6000i model indicates a charger failure. It is the first time that we opened this unit and we do not know the location of the charger circuit (we do not have a schematic diag). Could you...

The charger in powerware 9 series 9120 6000i ,the fan is of a quality that it fails and the heat sink does not get sufficient cooling ,it runs on 12 volt ,i replaced it with a cpu fan from a mainboard on a pc and it works perfectly now. make sure that the fan is running else the charger might go in protection or can fail due to the transistor on heat sink fails.

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I am looking for schematics for a Powerware 9125 6000G.

This may not help, but it is the best I can find:

Mar 11, 2010 | Computers & Internet

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Bad zener Powerware 5125-1500

There may be a reason. Too much current draw.
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Sep 09, 2009 | Powerware Computers & Internet

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Powerware 9125 power problems

Most modern ups units will not start at all without the batt, so disconnect the extra packs beg, borrow some new or old good batt blocs same spec as the original internal ones, as this is just a test any set of batts that is just ok will do.

fit them to the ups unit and see if it will start. if it will then you will need to replace all the batt blocs in the whole system.

If it does not start then the ups is faulty.

If you are not happy fitting /working with batteries then get a tech to do this work for you, batteries are very dangerous, they are always live and need to be handled with care at all times.

Hope this helps, thanks for asking FixYa

Jul 28, 2009 | Eaton Powerware® 9125 UPS System

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Battery test failed

1. Replace the batteries because they NEED to be replaced. It is not wise to ignore alarms.

2. Remove the battery backups. Without good batteries they are useless so why waste your time silencing alarms. Just make sure that the computers are plugged into a surge-protected outlet and you save your work frequently when there is bad weather.

FYI: Retail UPS batteries are only good for 2-3 years and high-end commercial batteries are only good for 3-5 years.

I hope this helps.

Jul 20, 2009 | Powerware 9120 UPS System

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LCD shows Low O/P V

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Cause: Surge Taken by load / Short Circuit on load / Fault in inverter

Remedy: Remove load and restart UPS / Try a different load / Repair or swap out

If you need spares or price for repair contact Eaton Power Quality Ltd - the new name for Powerware - 01753 608700

Dec 15, 2008 | Powerware 9120 UPS System

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