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Thread: Generator AVR

  1. #16
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    Thank you, I will have a read for both. Should be seeing the owner later today.
    No great hurry the replacement AVR doesn't seem to be any closer to getting here as yet. lol

  2. #17
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    An update so say no update.
    Wont see the owner before Thursday
    Beginning to think my AVR is being drop shipped

  3. #18
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    Talked to the owner. He tells me he bought it new and no one has been inside it, so I have to assume its wired correctly.
    The AVR has turned up and I may have ordered the wrong one. There seems to be some that use a 470uf cap and some that use a 670uf cap. Many make no mention of the cap. My small brain can't see it making much of a difference(in the short term, the larger cap may have an easier life?) or at least not blowing anything up. If the cap can't maintain a high enough V then the output will be limited?
    Weatherman says its going to be raining for a week, so its on hold ATM.

  4. #19
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    Hi Stuart, Guys,

    The cap value will make very little difference to the voltage ! Its mainly a time constant thing. Plus if you consider that the tolerance on capacitance is usually -20% to +50% for electrolytic ones.
    Best Regards:
    Baron J.

  5. #20
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    Weather man was wrong, so based on the above I plugged it in for a short test. Straight to 239.8V 52Hz. So added some loads.
    1950W ok 242.5V 51Hz
    4410W ok
    6510W won't do it. I think V dropped to about 140 and possibly the rpm dropped, but I didn't leave it long enough, took the last load off and it recovered fine.

    I don't recall the rated load, the peak is 8kw so I guess that's about right for a noname gennie. I had thought it was a brand name(for what that is worth)

    Calling that fixed. Though I might get the owner to give it a longer test(and possibly order a spare AVR).

    Thanks all
    Last edited by Stustoys; 13th Nov 2021 at 10:19 AM. Reason: 541hz was a typo ;)

  6. #21
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    Should I be concerned at this effort at heat sinking or do I assume the manufacture knows what they are doing? Maybe its cooling something I cant see under the fill..
    Attached Images Attached Images
    Last edited by Stustoys; 13th Nov 2021 at 02:58 PM. Reason: typo

  7. #22
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    Quote Originally Posted by steran50 View Post
    I have two generators at work and one is a capacitor type and I'm not sure on the other, but they both only produce about 120 volts. So I'll be interested to know what you find.
    If it helps(or maybe it will help someone googling)

    The AVR output to the field is around
    31V at 0W
    38V at 940W
    48V at 1800W

  8. #23
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    Quote Originally Posted by Stustoys View Post
    Should I be concerned at this effort at heat sinking or do I assume the manufacture knows what they are doing? Maybe its cooling something I cant see under the fill..
    Hi Stuart, Guys,

    That looks like a semiconductor under that bit of metal, probably a thyristor or power transistor !
    Best Regards:
    Baron J.

  9. #24
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    Quote Originally Posted by BaronJ View Post
    That looks like a semiconductor under that bit of metal, probably a thyristor or power transistor !
    Yes I should have remembered to get the number off it.
    Just going to send it back and tell him to by a spare. I bought 10 brush sets at $1 each, and I don't even know if they will fit my gennies but hey he will have a spare set of brushes lol

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