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hey dude your problem is so simple..below are my solutions.
if you already secured the fans for the replacement then its easy for you to do it, try to totally shut down your UPS removing the input and battery supply. avoid replacing the fans with power, its to dangerous. it consist of almost 400VDC inside in it.
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Eaton does not publish that type information on their website but here is the product page: www.eaton.com/9155 You can contact them directly for service and replacement parts:
Toll Free: 1 800 843 9433 International: +1 919 871 1800 E-mail (Hardware): LargeUPSTS@Eaton.com
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.
I don't know the exact cross reference number for you but Eaton tech support should be able to help you. Eaton bought Powerware 6 years ago but retained their service support personnel.
Toll Free: 1 800 843 9433 International: +1 919 871 1800 E-mail: LargeUPSTS@Eaton.com