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switcher dummy loads

Discussion in 'Electronic Repair' started by bob urz, Apr 2, 2010.

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  1. bob urz

    bob urz Guest

    I am working on a switching power supply from an older Avid hard disk
    array. The array itself has proprietary Ultra SCSI drives in it.
    No documentation is available.

    The power supply seems to have issues and blew the fuse. nothing seems
    to be shorted and no caps are bulging. As far as i can tell, the PS is
    about 12volts at 15 amps and 5 volts at 12 amps or so. I was thinking of
    hot wiring the supply outside of the unit and thought best to load down
    the rails some. So, what would be an acceptable dummy load(s) for a
    supply of that ratings? would a couple of amps per rail load sufficient
    to start up and maintain regulation?

    I am going to solder it up, i i have found no smoking guns so far.

  2. Sjouke Burry

    Sjouke Burry Guest

    Load with two car breaklights. Or with one,with the double
    filament, the heaviest to 12v, the other to 5v.
  3. Franc Zabkar

    Franc Zabkar Guest

    FWIW, I have a minicomputer PSU that delivers 150A @ 5V. Whenever a
    chassis was unloaded, the PSU was loaded with a fan cooled, 1 ohm, 50W
    aluminium clad resistor.

    - Franc Zabkar
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