MRC Power G AG990

Hytec Dec 11, 2019

  1. Hytec

    Hytec TrainBoard Member

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    Hi Y'all, I have an MRC Power G AG990 supply that has a continuous Overload light even with nothing connected to any of its terminals. There's no help on the MRC website, so I turn the experts on TB.

    History - To the best of my knowledge the supply has been running continuously at a Children's museum, five days a week, seven hours a day for about twenty years. I started volunteering about two years ago which quickly included the G Scale layout. I have no history before then.

    Does this condition indicate an internal failure? Or is there something else that might give this indication?

    Thanks for any help,
    Hank
     
  2. Grey One

    Grey One TrainBoard Supporter

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    20 Years is impressive.

    Sorry about the mis-post. Now edited.
     
    Last edited: Dec 12, 2019
  3. Keith Ledbetter

    Keith Ledbetter TrainBoard Member

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    Ya impressive does it still run with the indicator on or does it shut down. Just trying to see if an indicator failure or deeper issue.

    If deeper issue I would open it up and look at the capacitors and see if any look bulged aka blown as that is the most likely culprit. Or something is loose or corroded through.

    If those all look fine then you'll have to look into serious diagnostics on components and honestly I would just thank it for its 20 years of service and replace.
     
  4. Hytec

    Hytec TrainBoard Member

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    You're not going to believe this.

    I brought the supply home to troubleshoot further, but didn't get to it until the next day. I plugged it in, turned it on, and NO Overload light. :confused:

    Took it back to the museum, hooked it up, and ran trains without a hitch. o_O

    My only thought...there had been a derailment possibly creating a short circuit which may have caused the original Overload. I corrected that, but the Overload continued, even after I disconnected everything back at the supply. So my question is, does this supply have some sort of thermal protection that must cool before the Overload condition is reset? Otherwise I can't think of anything that would not reset an Overload indication until after a long delay.
     
  5. Keith Ledbetter

    Keith Ledbetter TrainBoard Member

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    Electrical Gremlins, gotta love them. glad it's working again with the least time consuming and free solution!
     
  6. Hardcoaler

    Hardcoaler TrainBoard Member

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    Hytec, your new power supply just arrived from GE, specially engineered for your application. :eek: [April 1993, Montgomery AL]

    1993-04-25 FLATCAR CSX Montgomery AL - for upload.jpg
     

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