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Apc battery backup makes squealing noise, then the power light comes on, why

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When there is no power coming into the UPS it will indicate so by 'squealing', during this time - the UPS is on battery. When power returns to it, it turns back to building power and the power light comes back on.

If you need UPS, Surge, or Power Related help contact Daniel @ Power & Systems Innovations 800.260.2259 or go to our website: http://psihq.com/

Posted on Nov 05, 2013

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Posted on Jan 02, 2017

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  • 37 Answers

SOURCE: I have a apc 650 model bk650mus battery backup.

how long the lifespam is the battery you had are using it? if you check the voltage that is 13.5dcv but it could be the Ah is already running low.. try to change with a new batts and power up the ups ifi it not workin that mean it the hardware issue..

Posted on Mar 24, 2009

  • 6 Answers

SOURCE: squealing noise

Depending on the unit, thats either telling you the battery is dead, the power is out, its overloaded (too much or too large equipment) or there's another problem with the unit. If you have the cable that should have come with the unit, you can connect it to a computer and install the software for a diagnosis.

If you unplug or turn off everything connected to it and it still squeals, the battery is probably dead, but it may be that something is wrong with the UPS itself, and you should send it back under warranty, or get a replacement.

Posted on Apr 29, 2009

  • 1 Answer

SOURCE: APC ES350 strange noise

My solution was to unplug everything, hit the reset button, and then power the unit back up. The problem I found to be that I had my laser printer connected to the "surge + battery" side, and for some reason no laser printer can be connected to it.

Posted on May 28, 2009

JaxPlanet
  • 922 Answers

SOURCE: APC back-ups XS 800 battery backup : warning

Turn it off and unplug it from the wall.
Open it up and make sure that the red and black wires are connected.
If they are the battery needs to be replaced. They are only good for 2-3 years. If you are not comfortable with my instructions, call APC for free support. (800) 555-2725

Vote for this solution if it helps.

Posted on Aug 18, 2009

  • 1 Answer

SOURCE: My APC bx900r is making a squealing noise with the

It has a fan. Your fan has died. This is causing it to overheat (which is interpreted as being in overload). Replace the fan or replace the unit. When this happened to me, I purchased a new fan for less than $10. You will need a 40mm fan and the ability to use a phillips screwdriver.

Posted on Sep 25, 2010

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Depending on the unit, thats either telling you the battery is dead, the power is out, its overloaded (too much or too large equipment) or there's another problem with the unit. If you have the cable that should have come with the unit, you can connect it to a computer and install the software for a diagnosis.

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