Question about APC Back-UPS RS 1500VA UPS System

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MY apc back ups rs1500 won't stay on when plugged to wall outlet.It starts and does not do the self test and then it keeps oscillating between the two top leds,as you hear the relays switching.If I unplug it the output at the outlets work..

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  • nhecharles Oct 05, 2010

    Yes the relays keep switching continously as I am hearing a clicking noise.

  • nhecharles Oct 05, 2010

    If this is helpful I have opened the UPS and checked the voltage at the batteries and it reads between 24&27 VDC.Also if I disconnect the battery pack the red led,low batt. comes on.

  • nhecharles Oct 05, 2010

    No I recently got it off a good friend with a view to repairing it.

  • nhecharles Oct 06, 2010

    Is it possible to receive a schematic for this model APC Back-UPS?

  • nhecharles Oct 09, 2010

    I have not had the time to continue working on the UPS,I also have a sony TV that I'm working on right now that's taking up my time.As soon as I get back to the UPS I'll let you know.

  • nhecharles Oct 20, 2010

    Hey eagle338 since my last post I have changed out all the major electrolitic capacitors upon the board and the fault still exists.I also wrote to APC about the problem and I was referred to the local agent so I am carrying the unit for them later in the week.If they can repair it that will be very good.I just hope it,s not too expensive.


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Do the relays keep switching continuously?And how do you know this? Do you hear a clicking noise? Please answer these questions so that we can continue troubleshooting.


Posted on Oct 05, 2010

  • 2 more comments 
  • eagle338
    eagle338 Oct 05, 2010

    If that is the case then there is a serious problem with the input circuit. You have an overload that is causing the relays to keep clicking. Since it is alternating itself, I strogly believe that the source of the overload is a faulty capacitor(A capacitor has a rapid charge/discharge cycle and I believe the click is happening during the charge cycle). Is the unit under warranty?

  • eagle338
    eagle338 Oct 05, 2010

    The voltage seems to be normal. And like I said its not a problem with the output or the battery. Look for faulty caps in the input circuit. You can visually identify them by means of a crack, a swollen top or if the electrolyte is leaking. Even a tiny hole at the top can cause problems and sometimes its barely noticeable. So you need to look close. Better yet if your multimeter has capacitance measurement capability then you can measure the capacitance and compare it with the actual value thats printed on the capacitor.

  • eagle338
    eagle338 Oct 06, 2010

    It is very hard to find schematics for a UPS but I will have a look around to see if I can find one. Also the input circuit is very easy to locate. The power cable from the mains will run into a PCB which is the power input board. Shouldn't be too hard locating caps on that small board. They look like cylindrical tubes with a X cut at the top.

  • eagle338
    eagle338 Oct 09, 2010

    Ok. No problem.


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Plug the battery backup into a working electrical outlet. If the battery backup turns on when the power button is pressed, then the problem may be that the previous electrical outlet is faulty. Proceed to step three. If the battery backup doesn't turn on, proceed to step two.
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