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Warm Alternator

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rv7a(at)cox.net
Guest

Posted: Thu Feb 11, 2010 5:52 pm Post subject: Warm Alternator

Had an interesting discovery today.  I was charging  the battery on my RV-7A and had the Master on and the Dynon Flt-Dek 180 on while  I was doing some calibrations.  When I got out of the airplane I felt the  alternator an it was warm to the touch.  When I turned the Master and  Dynon off it soon dropped to ambient temp.  Do I have something wrong  in my wiring? Or would this be normally expected given the circumstances  described.  I have wired the plane in accordance with the Z-13 diagram but  have the internally regulated alternator until I need to change it.

  

 Jim Thorne



    [quote][b]

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nuckolls.bob(at)aeroelect
Guest

Posted: Fri Feb 12, 2010 7:31 am Post subject: Warm Alternator

At 07:21 PM 2/11/2010, you wrote:

  	  Quote: 	
		   Had an interesting discovery today.  I was charging the battery on my RV-7A and had the Master on and the Dynon Flt-Dek 180 on while I was doing some calibrations.  When I got out of the airplane I felt the alternator an it was warm to the touch.  When I turned the Master and Dynon off it soon dropped to ambient temp.  Do I have something wrong in my wiring? Or would this be normally expected given the circumstances described.  I have wired the plane in accordance with the Z-13 diagram but have the internally regulated alternator until I need to change it. 	


    If the bus is hot and the engine not running and

    assuming further that the alternator's internal

    regulator is not fitted with a "stationary alternator

    detection system" then the regulator will run the

    field at full bus voltage and draw about 3 amps.

    This is on the order of 40-50 watts of heat

    being dissipated within the alternator. If Z-13,

    then do you have absolute control of the alternator

    via the ity-bity wire that goes into the back of

    the alternator? Was your master switch fully ON

    (BATT + ALT) or just up to the mid (BATT ONLY)

    position?



    Bob . . .    [quote][b]

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klehman(at)albedo.net
Guest

Posted: Fri Feb 12, 2010 7:42 pm Post subject: Warm Alternator

About 4 years ago I mentioned the same thing with my new Nippondenso 40 

amp alternator. If the IGN wire (itty- bitty wire) is powered up then my 

alternator indeed draws field current from the B+ terminal.



Obviously it can't draw any current when the OV contactor is switched 

off to disconnect both the B+ line and the IGN wire from the battery. 

Some alternators also seem to draw a mA or so of standby current from 

the B+ lead. Anyway the OV contactor eliminates all current draw if the 

aircraft sits for long periods or if there is an internal alternator 

problem. 320 happy and worry free hours on it so far.



Ken



Robert L. Nuckolls, III wrote:

 	  Quote: 	
		   At 07:21 PM 2/11/2010, you wrote:

> Had an interesting discovery today.  I was charging the battery on my 

> RV-7A and had the Master on and the Dynon Flt-Dek 180 on while I was 

> doing some calibrations.  When I got out of the airplane I felt the 

> alternator an it was warm to the touch.  When I turned the Master and 

> Dynon off it soon dropped to ambient temp.  Do I have something wrong 

> in my wiring? Or would this be normally expected given the 

> circumstances described.  I have wired the plane in accordance with 

> the Z-13 diagram but have the internally regulated alternator until I 

> need to change it.

 

    If the bus is hot and the engine not running and

    assuming further that the alternator's internal

    regulator is not fitted with a "stationary alternator

    detection system" then the regulator will run the

    field at full bus voltage and draw about 3 amps.

    This is on the order of 40-50 watts of heat

    being dissipated within the alternator. If Z-13,

    then do you have absolute control of the alternator

    via the ity-bity wire that goes into the back of

    the alternator? Was your master switch fully ON

    (BATT + ALT) or just up to the mid (BATT ONLY)

    position?

 

    Bob . . .

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