Question about APC (BK500TW) UPS System

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Intermittent "On Battery warning"

I don't know what's up! I have my cable modem, CPU and Monitor hooked up and it recently began to cycle to On Battery for the standard four-beep warning at random times. Other times, sometimes during the same cycle, it doesn't make it to four beeps and then everything is fine for awhile! None of the other appliances hooked up to the same outlets show any change when this happens. Florida is notorious for "dirty" power conditions and I can usually see the results of dropouts and spikes in the lamps when they occur, but this doesn't seem to follow that pattern. The battery is 3 yrs. old, but seems to be doing well and it really hasn't been stressed more than a couple of times.

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  • HarpMan1224 May 27, 2008


    I found I had a driver problem that wrecked not only the keyboard function, but made some other undesirable things pop up. Like hanging characters in the stack, which made the cable modem hiccup and spontaneously reboot me! I installed a keyboard driver and it made it all go cuckoo! Since I uninstalled the keyboard, then reinstalled the generic driver Windows installs, my keyboard is still a little funny but it's better and no more probs with the APC or the modem! At any rate, look at any new drivers you've installed lately. Hope that helps!

  • Jocelyn Viau
    Jocelyn Viau May 11, 2010

    Have your installed the PowerChute 2.x software that came with the unit on your computer?


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What was the problem and how did you solve it? I think I also have this problem. thanks in advance

Posted on May 27, 2008

No, I used to until I had to do a Recovery and I didn't reinstall it! But I found out the prob and have resolved it. Thanks for your time and assistance.

Posted on May 21, 2008

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