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repairing an APC UPS

Discussion in 'Electronic Repair' started by Luke Siemaszko, May 6, 2005.

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  1. We have an APC UPS that has gone faulty.

    APC will not supply a circuit diagram, and do hnot have a repair
    facility - their advice is to throw it away and buy aa new one.

    If I do that, it certainly won't be an APC one that I buy.

    In the meantime I'd still l ike to try and fix the one we have. Has
    anyone got any experience of this, or any schematics even?

    thanks
     
  2. Art

    Art Guest

    Basically a DC to AC inverter with voltage and current protection circuits.
    However there are also wave shaping circuits in the AC production section of
    the device. In-depth troubleshooting and diagnostics may result in
    determining what device is causing the fault however getting appropriate
    replacement components may be the challenge. BE advised, the circuitry
    produces voltages that may be considered lethal when in operation. Follow
    all the safety rules endemic to this kind of service. IMHO: APC makes some
    rather nice products, almost all are not consumer serviceable.<
     
  3. Hardly.
    If my car goes wrong I expect to be able to fix it.
    If my stereo (assuming it isn't a really cheap one) goes wrong I
    wouldn't expect to fix it.

    How would you propose fixing a soft drink ??????????
     
  4. Thanks. We are fine with electonics generally, just never dealt with a
    UPS before.

    Thanks for the reply.
     
  5. Mark

    Mark Guest

    its usually a bad battery

    Mark
     
  6. indeed, but there are no LEDS on the front panel, nothing at all - would
    a bad battery cause everything to die ?
     
  7. Larry Fowkes

    Larry Fowkes Guest

    I have seen a bad battery cause a UPS to be totally DOA many times.

    Larry
     
  8. TheDragon

    TheDragon Guest

    Most certainly. if the Battery is totally dead, the UPS will not do a
    sausage. Test with car batteries matching the voltage reqd. If it springs
    into life, buy new batteries. I have about a dozen UPS devices around the
    house all bought as Dead. New batteries fixed EVERY One.

    Range from APC BackUPS300 to SmartUPS1400VA, must be a few quids worth if
    bought new. Gel batteries are pretty cheap nowadays too
     
  9. Guest

    Some of these have automotive-type blade fuses in the battery line on
    the circuit board. Also, as has been mentioned, try a new battery.
    I have had good luck with Power Sonic and Panasonic brand gel cells.

    Note that most of these will go into a test mode for a few seconds on
    startup, and when this happens, quite a large current is drawn from
    the battery for a moment. If you are lashing up some random battery
    you have lying around, use wires at least as large as the ones already
    in the UPS. I tried to start up a APC Smart-UPS 600 with not quite
    the right batteries and a cheap ~20 gauge clip lead and melted the
    clip lead.

    If you get it running, but it complains about a low battery even when
    you know the battery is fully charged, go to
    http://us1.networkupstools.org/faq/ and read the answer to "Q: I
    replaced the battery in my APC Smart-UPS and now it thinks the battery
    is low all the time. How do you fix this?"

    Matt Roberds
     
  10. JANA

    JANA Guest

    We are using a fair number of UPS's around here. We found the APC to be one
    of the best. You will find that ALL of the UPS manufactures will NOT supply
    ANY service manuals or schematics, or parts.

    If your APC unit is dead, there is a 99.9% chance that it is the battery.
    Most of their models go in to a protect mode, and completely shut down when
    the batteries are warn down.

    Replace the batteries with the same amp hour and voltage rating, in the same
    combination. This is a safety thing for having the proper charge and load
    current. If you buy a set of generic batteries, make sure that the terminals
    match, and that you transfer the thermo fuse (if there is one), that is one
    stuck on to the battery assembly. This fuse is very important to have in
    there.

    --

    JANA
    _____


    We have an APC UPS that has gone faulty.

    APC will not supply a circuit diagram, and do hnot have a repair
    facility - their advice is to throw it away and buy aa new one.

    If I do that, it certainly won't be an APC one that I buy.

    In the meantime I'd still l ike to try and fix the one we have. Has
    anyone got any experience of this, or any schematics even?

    thanks
     
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