Question about APC Smart-UPS 750XL (SUA750XLI) UPS System

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I have a Smart-ups 750 XL. Had a power black out that lasted two days. It was unplugged during that time but may have been left on and run dead. My wife plugged the ups back in to charge for a couple hours today and then booted up her computer off it. Only the “on battery” light is lit on the center two columns. The alarm is sounding and the charge indicator light has gone from 3 lights to 2 to 1. Following the manuals instructions for “circuit breaker tripped” I pulled all the plugs out of the ups and pushed in the circuit breaker to reset it. This had no effect. The outlet is good and the “site wiring light” is not on. The system is only about 10 months old. There is no load on the ups now and it is plugged into the outlet. One charging light blinks for about a minute and then it shuts off. Is it dead? Thanks.

Posted by Anonymous on

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skipsinclair
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SOURCE: APC ES-350 won't turn on; all I see is a blinking light.

Try looking for a small circuit breaker on the side that says "press to reset" - you could have tripped it accidentally when you unplugged the iPod.  Also, try pressing and holding the UPS power switch for 10-15 seconds.  That should force a power on as well.

Posted on May 27, 2009

Gort007
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SOURCE: Have brand new APC 900 UPS and when plugged in,

Nope! The internal battery is not plugged-in correctly. Unplug the APC unit and open the access door to the battery (it is not dangerous to do).
Re-seat the two wire clips (red & black) to the battery. The positive post has a red mark on it.
Close it up and charge for a few hours before using.

If the symptoms continue, return unit to store.

Posted on Sep 19, 2009

jpecore
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SOURCE: New batteries in Smart UPS 700 only lasts 2 minutes at 30% load

If you blistered your older batteries a good chance your inverter is going or will go bad. The heat alone can do damage to your components. Time to replace the unit and remember next time not to wait so long to replace your batteries. Replacement of batteries every three to approaching four years is a good idea.

Posted on Oct 22, 2009

  • 15 Answers

SOURCE: "On Battery" Alarm Sounds when Power Available.

if this comes sometimes and goes, this means that the power to ups is sometimes deviating from the specific ups input range, hence the ups is rejecting it. mesure the input voltagesand frequency with a multimeter and check whether they match the specified ones in the ups manual. aslo with some ups there are switches that you use to set the input voltages or number of phases in the ups input. check the manual to see whetther your ups has such.

Posted on Oct 25, 2009

  • 5 Answers

SOURCE: smart ups 750-replaced battery because the battery

This could be a malfunction in the charging circuit

Posted on Jul 22, 2010

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