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Charge problems 912 UL

in General Tech Discussion 8 years ago

  • Re: Charge problems 912 UL

    by » 8 years ago

    No.
    Can I try this


    I read in a blog on

    pointsforpilots.blogspot.se/2012/12/test...4-generator-and.html

    "With engine running and the two yellow wires still off the regulator / rectifier, test the AC voltage between the two wires. It Should be:
    15-20 VAC During idle
    30-40 VAC During high rpm "

    Can I check that the generator operates that way without burning the coils?
      
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  • Re: Charge problems 912 UL

    by » 8 years ago

    The regulator uses a switched bridge rectifier to controll the output. So any time the system isn't changing you have an open circuit at the yellow wires.
    What would damage the stator coils is high voltage breaking down the varnish Insulation on these coils, 50VAC won't be a problem.
    Thank you said by: Johan Ekroth
      
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  • Re: Charge problems 912 UL

    by » 8 years ago

    You can check the wire voltages and values while the engine is running just by sticking the meter probe into the VR socket end where each wire inserts. I would not run the engine with your wiring disconnected.

    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-349-7056 Cell

      
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  • Re: Charge problems 912 UL

    by » 8 years ago

    I made measurements according to Rotax heavy manual.

    I have checked and reinforced for all earth points.

    During the measurement, I have linked up a whole new independent circuit, so the existing electrical wiring not touched the measured circuit, which I linked to a new external battery
    All values were good.

    I have measured VAC between the yellow generator cables and got out 14,5Volt at idle and 32 volts at 4000 rpm.

    I have exchanged the charge regulator who was installed when the charging stopped working. I have a used charge regulator I switch to so it can be the source of error. otherwise I do not see anything other than the magnetic ring as a possible error source. I'll get a new charge regulator tomorrow, Then I hope that everything is running again.

    Regards
    Johan
      
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  • Re: Charge problems 912 UL

    by » 8 years ago

    installation of a new charging regulator and the problem was gone.
      
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