this unit come with 4 with battery backup of 12v 7ah. check what are the indicator display shown?
it very diffcult know what the problem if u can give more info. u can try to replace the battery with new batts.. and test the ups if it not beeping again it show the battery problem. or maybe you had plug in more the the power consumtion that why it keep sound the alarm indication overload try to serperate the load. if u wan a user manual go to this website to download the manual:
http://es.tripplite.com/support/manuals/index.cfm
u will get will u wan...
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