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No output on 45kw ohno MCGCA

Discussion in 'Generators' started by Pascal, Jan 15, 2024.

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  1. Pascal, Jan 15, 2024
    #1
    Pascal

    Pascal Senior Member

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    One of our 45 kW Ohnos fired right up today but isn’t outputting any power. Checked both the main 100amp breaker and the field breaker.

    Any suggestion? 2005 vintage MCGCA
  2. Capt Ralph, Jan 15, 2024
    #2
    Capt Ralph

    Capt Ralph Senior Member

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    F'ing OhNo's.

    If all AVR, there may be an exciter lead with a bad connection.
    Some OhNo AVRs will not excite the field if "it thinks" there is a fault.
    Slow to come to speed, or not at speed as an example.

    Relays? One may fail on the exciters.
    I remember one OhNo that had an exciter fuse.
    Some where, some place, for some reason, the exciter is not getting excited..
    After my second wife, I under stand this...

    Oh, Field breaker. OhNo uses the cheapest vendor on the pop-out fault breaker.
    Short this in your trials.

    Usually 12Vdc to the exciter windings, can you get a volt meter on that lead.

    I am assuming you have a later model brush-less armature,,,if not you may just have a worn or stuck exciter brush.

    Are you deployed?
    Last edited: Jan 15, 2024
  3. Capt Ralph, Jan 16, 2024
    #3
    Capt Ralph

    Capt Ralph Senior Member

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    Find anything yet?
    I just don't have any manuals on that ole beast.
    Last edited: Jan 16, 2024
  4. Pascal, Jan 16, 2024
    #4
    Pascal

    Pascal Senior Member

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    I haven’t had a chance to look at it today. I have the operator and parts manual but nothing beyond “check the field breaker”

    we re in miami so my gen guy is coming tomorrow. I m pretty sure we have a spare regulator on board but I ll let him handle it. He s super helpful and deserves to make a buck :)
  5. Capt Ralph, Jan 16, 2024
    #5
    Capt Ralph

    Capt Ralph Senior Member

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    Good plan, I was scared you were deployed.
  6. Pascal, Jan 17, 2024
    #6
    Pascal

    Pascal Senior Member

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    It was indeed the voltage regulator. I had a spare so it was fixed quickly by my tech and I ve told him to get me another spare
  7. Capt Ralph, Jan 17, 2024
    #7
    Capt Ralph

    Capt Ralph Senior Member

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    Outstanding report and good news.
  8. Pascal, Jan 17, 2024
    #8
    Pascal

    Pascal Senior Member

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    And of course Ohno hides the regulator behind TWO panels each held with a dozen screws or bolts. And the regulator is the size of the hole it s hiding in making it a pita to extract and transfer all the connections.
  9. Capt Ralph, Jan 17, 2024
    #9
    Capt Ralph

    Capt Ralph Senior Member

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    Genuine OhNo..
  10. Pascal, Feb 26, 2024
    #10
    Pascal

    Pascal Senior Member

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    But wait there is more…. That spare regulator I had while looking brand new may have been used and defective. It worked far a few hours and failed. I suspect it had been removed and kept but not marked had used/failed. I Replaced with a brand new one. And got another new one as spare.
  11. Capt Ralph, Feb 26, 2024
    #11
    Capt Ralph

    Capt Ralph Senior Member

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    So, How long has the BrandNew AVR been in?
    Something eating up your AVRs (original and used spare)??
  12. Pascal, Feb 26, 2024
    #12
    Pascal

    Pascal Senior Member

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    We ve out about 100 hours on it in the last couple of weeks. I think it was an old defective VR which someone just left on board
    Capt Ralph likes this.