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APC Smart UPS shows overload with no load attached

Discussion in 'Electronic Repair' started by [email protected], Feb 19, 2007.

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  1. Guest

    How do I deal with a Smart UPS 1000 that shows overload after self
    test when no load is attached? The inverter sounds quite a bit louder
    than usual.

    This unit worked fine for a long time until it was unplugged for
    precisely 2 weeks and moved...
  2. Battery would be the first thought. Voltage under load?


  3. Meat Plow

    Meat Plow Guest

    Or it got dropped during the move.
  4. w9gb

    w9gb Guest

    Typical failures of APC UPS -- in order of frequency
    (based upon an APC refurbishment operation):

    1. Battery
    2. Charger circuit for battery
    3. Inverter circuit from battery to outlets

  5. Arfa Daily

    Arfa Daily Guest

    I'm very interested in this. Are you directly involved with this
    refurbishment operation, to the point of knowing these units well ? I have a
    Smart-UPS 700. It seems to indicate that it thinks all is well when it is
    just idling, single computer on the end, one load light showing, centre
    "doing nothing" status light showing, but a few months ago, we had some
    power outages in the village where I live, and it failed to hold the power
    up, causing the computer attached to it to immediately reset.

    At this point, the battery level indicator had dropped to one light, and the
    red battery warning light was flashing, even though prior to the event, it
    had been showing full. I replaced the batteries anyway with a similar size
    and rating, and thought that all was well then, but it's not. When the unit
    does it's periodic self-check, it does a similar thing, and beeps furiously,
    although it continues to supply power. If you leave it long enough, it seems
    to recover from this, but the battery level LEDs are again then indicating a
    low and defective battery for a couple of hours. A few of days ago, we again
    had some brief power outages, and again, it failed.

    I'm not going to spend too much time on it without schematics, and to be
    honest, I have so much other repair work in at the moment that I would
    struggle to find the time, but if these symptoms ring any bells as to
    specifics for this make and model, I would be very interested to know.

  6. Guest

    I wish I could blame it on that, but the best I can offer there
    is that it may have caught some bad vibrations during the drive.
    I'll take it apart and reconnect everything next time I look at it.
  7. clifto

    clifto Guest

    Someone gave me one a while back. I replaced the batteries with prime
    units from a local alarm company. Recently a cat caused a shutdown of
    power to the unit and it completely discharged. I restored power to it
    and it seemed okay, but over 24 hours later (and naturally at 0-dark-30)
    our natural-gas alarm went off. After the gas company cleared their
    stuff, I figured out the vapor was coming from the SmartUPS 700, which
    was pretty hot.

    I unplugged it and took it out of service. I have a nice, new 1000VA
    TrippLite from Costco and I feel much safer now.
  8. Guest

    Well, I disassembled (discharging the two large capacitors) and
    reassembled it, with no improvement. But I got it to work in a very
    strange fashion. So I'm trying to make sense out of this.

    The UPS does not complete self test when nothing is plugged into it.
    lights the overload indicator only and a constant audible tone.

    If I plug a 40W lamp into it, it completes the self test and operates

    One more little tidbit of information is that I have 126V at my
    which triggers the overvoltage regulation in the unit after it passes
    self test.


    I'm glad it seems to be working now at least. I just find it very odd
    the way to cure the UPS sensing an overload is to plug a load into it,
    and thinking that maybe it has something to do with the high input
  9. w9gb

    w9gb Guest

    Arfa -

    I met Chris through some mutual friends -- he first started this business in
    his parent's basement (when he was finishing high school).

    IF you have a specific question -- fell free to call or e-mail him at the
    Internet -- I provided.

    APC has now been purchased by Schneider Electric (a French company that also
    acquired Square D a few years ago).

  10. Arfa Daily

    Arfa Daily Guest

    If this Chris guy is the one to talk to with detailed knowledge of these,
    then yes. I would like to put my symptoms to him. As I'm sure you know if
    you're involved in service at all, it's very common if you explain a set of
    symptoms for an item that you're not familiar with, to someone who is, they
    will just say " Oh yes, that's a common problem. Just replace Q502 " or
    whatever. Once again, today, we had a brief power outage in the village, and
    once again, the ups didn't hold up. However, perhaps I'm missing something.
    This is the first reference that I've seen to him, and I'm not seeing any
    contact e-mail or web address for him anywhere. If you would prefer, just
    mail me his details direct off-group. Is he a licensed ham operator ? I note
    that you are mailing via the ARRL. I too am licensed here.

  11. Guest

    Well, how odd. I had a Tripp Lite cheapo unit that claimed the
    battery was bad even though it was only a year old. I was also
    surprised to find that plugging a load into it allowed it to "see" the
    battery and charge it as usual.

    Is there something to this or did lightning just strike twice?
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