Why doesn’t my UPS work?

Parul Gupta August 22, 2012
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Though my CPU and monitor are connected through UPS, every time there is power cut, my PC restarts! It restarts again when power backup kicks in, and then again when when power supply is restored.
Why does not the UPS work?
What needs to be done so that i do not lose my work?

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  1. Tony Batty
    August 30, 2012 at 5:46 am

    Parul, we call that ID Ten T technical problem, mein it just a joke, but you need, ensure that the power cable is plugged and that the extra cable that come in the box is connected to the UPS and either USB or Serial ports, most bring an install CD to install a small program that you'd use to configure the settings for the UPS to kick in when you would experience a power failure. Mostly likely you can go to the Screen Saver pane and look for Change Power Settings and you will see a few configurations that you manually set to you liking once you have the UPS installed.

    IDtenT ( ID10T )

  2. ha14
    August 23, 2012 at 8:37 pm

    In the BIOS there should be Advanced Power Management (APM) with option like:
    Restore from AC power loss [always off | always on | last state]
    http://en.wikipedia.org/wiki/Advanced_power_management
    http://www.annoyances.org/exec/show/article07-044

  3. susendeep dutta
    August 23, 2012 at 5:24 pm

    Also,you need to check the SMPS for any possible damage i.e. burn out.

    • Parul Gupta
      August 23, 2012 at 7:59 pm

      SMPS is fine! No problems there..

  4. Mike
    August 23, 2012 at 12:00 am

    It would be good to know which UPS you have to determine if it is a possibility or more likely a defect.

    Assuming you have a very basic stand-by/offline UPS there are multiple reasons that could cause this problem:

    1. The UPS does take some time to switch from power circuit to the battery. If the power outage is not detected within a few millisecond this delay together with the switching time could be enough to cut the power on your computer.

    2. Aging on the UPS and battery (+3years) can further increase the above effect.

    3. If the UPS is connected to the PC e.g. via COM or USB some software error could trigger the restart.

    4. A bad or very old power supply of your computer could also be a problem with this. For an Offline/Stand-by UPS switching to battery and back means NO POWER on the output for a few millisecond. If the capacitors of the UPS don't hold enough power for this small window your PC would also go dark.

    • Bruce Epper
      August 23, 2012 at 1:21 am

      Another possibility is that the undervoltage level is set too low. Adjusting this limit upward may be necessary but should only be done by a qualified technician.

    • Parul Gupta
      August 23, 2012 at 7:59 pm

      -Battery is brand new
      -It isn't connected through USB(don't know what COM is)
      -Is not a very old pc
      Will get it to technician.. thanks..

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