Question about APC (SUA3000I) UPS System

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The UPS does not come on at all

We usually turn off the UPS on leaving. Upon trying to put it on the next day, the UPS does not come on again. I have tried holding down the power button for some seconds to activate battery power but nothing.

Help! What could be the problem?

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Well how long you had use the battery already if it more than 3 yrs it time to change a new one the time of the lifespam of the battery it startin to decae or the battery is bad. replace a new battery and test it up.. i sugguest you to on the power of the ups all the time. no need to worry for the equiment to be gettin spoil.. ups is able to with stand the unstable power and to protected the equiments.. the liabitily of the ups is high.. if you keep turn off the ups you may not a ware that u are not fully turnin off the ups that cause of the internal chargin may still charging and dis discharge and cause the life spam of the battery to dead faster.. that becoz the battery after u install into the ups it start to charge and discharge 300 cycles so it juz nice to prolong till 3 yrs but if you turning off and on it will speed up the cycles..

Posted on Mar 24, 2009

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The most common problem with UPS that no longer works is that the battery is dead. They often do not last longer than a few years. Replacement batteries can be bought rather inexpensively at any battery store. Usually they are some combination of 12 volt 7 amp sealed lead acid batteries. Replacing them usually get the UPS going again.

By the way. If you do not want to go to the expense of replacing the batteries, the UPS usually still functions as a first class surge arrestor and line filter.

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Hi Shabbir,

Does the UPS start-up and then immediately turn off? If so, check the battery in the UPS, that's usually the cause.

Reply or call if you need more assistance -- 800.260.2259


** If this helped please leave a positive review :) **

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Good day

the common problems on all u.p.s is not turn on..

that problem is usually happens when the back-up battery inside is drain or leak..

just replaced the battery to fix you problem..

thanks for using fixya..have a nice day!!

good luck

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1 Answer

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These lower powered and cheaper KVA type UPS are switch over types, when the mains supply fail, the UPS switches over to the inverter in milli-seconds which then supplies mains power but the power waveform is a pseudo sine wave (ie not a true sinewave. A faulty inverter circuit won’t deliver power when the mains supply fails.

The true UPS types are usually the higher KVA units (over 1500 VA) that supplies uninterrupted mains power. The mains power is connected to a charger which charges the batteries and the inverter draws power from these batteries and converts it to true sine wave mains power therefore there is no switch over time lag from the mains to the battery.

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1 Answer

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Does the red light flash over the battery symbol?
If so the batterries are either faulty or have a low level of charge or the charging circuit is faulty.

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1 Answer

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