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Charge problems 912 UL

in General Tech Discussion 8 years ago
Hello
I have charging problem on my 912UL. (New mar 2013, 321 hrs) I have to divert a flight and landed with 10.9 V battery. after that
I have installed new charging relay and battery, and connected on an extra ground wire between the engine and battery, When running the engine at 1900-3200 rpm show the voltmeter with electricity consumers off 13,1V and with all electrical consumers on 12,3V. Where should I start looking make suggestions. I'll read me on how to measure the unit in heavy manual but someone may have been through this and have tipps.

/Johan

  • Re: Charge problems 912 UL

    by » 8 years ago

    Maybe a voltage regulator problem?
    See this RV-12 thread... http://www.vansairforce.com/community/showthread.php?t=122197
      
    Report

  • Re: Charge problems 912 UL

    by » 8 years ago

    Hi Johan,

    Is the body of the voltage regulator (VR) separately grounded? It should be. Double check the VR plug and make sure it is all the way seated into the VR. Pull on each wire out of the VR plug and make sure none come out and they are indeed connected inside the plug and don't slip back outward. Hook up a voltmeter while the engine is running to the VR and make sure that voltage corresponds fairly close to what you are seeing on your instrument panel.

    Do these things first.

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

      
    Report

  • Re: Charge problems 912 UL

    by » 8 years ago

    I made measurements with the Rotax Heavy Maintenance Manual 74.00.00

    3.12 Measurement values.

    Results from yellow to yellow from the generator, is 0.39 to 0.7 Ώ measured by different instruments
    Measuring with yellow to ground the result ∞. Both measurements within the correct values.

    3.7 Generator Coils.

    I tried with two different charging regularorer, both Rotax Ducati. The first charge controller that was installed when during the flight, is from an engine change in 2013 does not turn off the charging light and gave no values ​​higher than battery.

    Charge controller number two is from 2005 It was great and saved when we changed the engine. with that charge controller mounted charging light goes out. idle RPM without loads 13,1 Volt it increases slowly and after 1-2 min 13,32 Volt. With 150 watt consumers 12.1 Volt decreasing and after 1-2 min to 11.9 Volt still going down. The speed marginal distinction.

    I read in a blog on
     
    http://pointsforpilots.blogspot.se/2012/12/testing-rotax-912914-generator-and.html

    "With engine running and the two 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 you check that the generator operates that way without burning the coils?
      
    Report

  • Re: Charge problems 912 UL

    by » 8 years ago

    Its done.

    I have done this

    Hi Johan,

    Is the body of the voltage regulator (VR) separately grounded? It should be. Double check the VR plug and make sure it is all the way seated into the VR. Pull on each wire out of the VR plug and make sure none come out and they are indeed connected inside the plug and don't slip back outward. Hook up a voltmeter while the engine is running to the VR and make sure that voltage corresponds fairly close to what you are seeing on your instrument panel.

    Do these things first.
      
    Report

  • Re: Charge problems 912 UL

    by » 8 years ago

    Is it fixed?

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

      
    Report
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