Question about APC (BE500U-WEB) (BE500UWEB) UPS System

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Squealing noise Hi, my backup just started making a squealing noise, what could be causing that? Joanne

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  • johnl2009 May 11, 2010

    What model backup unit?

  • Anonymous Mar 29, 2014

    when i plug in my backup hard drive there is a squealing noise coming from it

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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.

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

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The UPS will beep/squeal if the power isn't turned off to it before it is unplugged from the wall. But the other thing that may be causing the noise is a bad battery. Replacement battery price is $26.00.

Reply or call if you need more help with this -- 407.380.9200

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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/

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