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Alarm error #191 comes from a battery test, where batteries are put under load for 25 seconds. (If the alarm is unexpected, you might have enabled the periodic 30-day battery test.)
#191 is test failure for battery internal resistance. So, need to locate and replace the bad battery, then run the battery test manually. If batteries are good, make sure no battery connector is corroded or loose.
You need to post more information as to what the exact problem is.
If it is just how to turn on, you can download a manual from the Powerware site.
To turn the UPS on, press the middle button on long enough for the UPS to come on.
It will display that it is coming on, then will do abattery self test.
You can view the manual here: http://powerquality.eaton.com/Products-services/legacy/9150-info.asp You can also contact the Eaton service department as they'll know this UPS better than anybody. They acquired Powerware years ago and kept the service personnel. Toll Free: 1 800 843 9433 International: +1 919 871 1800 E-mail: LargeUPSTS@Eaton.com