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plug something (other then a computer)into it, turn the gadget on, then unplug the UPS. If the gadget continues active the UPS is OK. Generally after you have punched every button (circuit breakers). After that put a Volt/Ohm meter on the batteries (and the charging wires to check the charging curcuit is OK.
So something happened to this apc and the first thing is to replace batteries...
I'm going to guess major circuit board failure.
go to apc site, download Power Chute software and pray there are useful diagnostics.
Many UPS Systems have a squared wave when working on batteries. Cheap multimeters do not give the correct measure on squared waves. Connect a 100 watts resistive lamp to the output of the UPS, if the light is almost the same when UPS is working on batteries, everythinf is fine.
Back up devices on the computer creates copies of every new features that are performed. The backup devices default settings may allow to save data every often like 2-3 times in 24 hours. also, the backup devices save settings can be altered to suit user speciifcations. for example, important projects on important files may require to save every few seconds lest any malfuntion that occurs to the computer is misplaced. back devices are considered external structures and should be locate on the computer systems control panel area with a unique description. Clicking on the backup devices logos would allow to manipulate either create urgent backup or space the backup to make the computer faster where back becomes attainabel durign idle hours.( for example, set the computer backup to first tthing in the morning or last at close of computer usage.)
APC do not release cct diags and these are not easy to repair, if the battery fuse was open and there is some board damage, the thing is toast. Even if you get it going the battery will not be able to be calibrated, unless there the board/processor is 100%, I know this as we have a similar model on the bench right now with new batts in and the unit will not recalibrate, so even though the batts are new, as soon as the mains is dropped it goes to very low battery and shuts down in 2 mins.
Buy a new UPS save yourself a lot of time. Hope this helps
Have you load tested the batteries? DCV is not a good enough test for the batteries, they could still open right up under load. If the UPS is over 3 years old, I'd swap the batteries. Your power is drawing solely from the batteries on AC line loss, so if the UPS is failing when that occurs, almost certainly is the batteries.