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Alt Cb Pops

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richard(at)talbots.net.au
Guest

Posted: Wed Feb 24, 2010 3:49 am Post subject: Alt Cb Pops

G'day List,



I have a problem that my Plane Power alternator has started poping the  

crowbar OV CB when I switch on the ignition.  I have 90 hours so far  

without too many issues.



I have checked wiring etc and run continuity checks.  There is no  

resistance in the wiring runs.  The current draw is 10A through the CB  

and it pops 3-5 seconds after switch on.



Any ideas?  I think the internals might have failed.  Could there be a  

cheap fix?



Thanks

Richard

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Tim Olson

Joined: 25 Jan 2007
Posts: 2879

Posted: Wed Feb 24, 2010 9:15 am Post subject: Alt Cb Pops

I'd start with calling them.  They seem to be very good

at supporting people, so maybe they'll just take it in

and check/fix it.

Tim Olson - RV-10 N104CD

do not archive

Richard Talbot wrote:

 	  Quote: 	
		   

 

 G'day List,

 

 I have a problem that my Plane Power alternator has started poping the  

 crowbar OV CB when I switch on the ignition.  I have 90 hours so far  

 without too many issues.

 

 I have checked wiring etc and run continuity checks.  There is no  

 resistance in the wiring runs.  The current draw is 10A through the CB  

 and it pops 3-5 seconds after switch on.

 

 Any ideas?  I think the internals might have failed.  Could there be a  

 cheap fix?

 

 Thanks

 Richard

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nuckolls.bob(at)aeroelect
Guest

Posted: Wed Feb 24, 2010 6:30 pm Post subject: Alt Cb Pops

At 05:47 AM 2/24/2010, you wrote:

 	  Quote: 	
		  

<richard(at)talbots.net.au>



G'day List,



I have a problem that my Plane Power alternator has started poping the

crowbar OV CB when I switch on the ignition.  I have 90 hours so far

without too many issues.



I have checked wiring etc and run continuity checks.  There is no

resistance in the wiring runs.  The current draw is 10A through the CB

and it pops 3-5 seconds after switch on.


	


   Hmmmm . . . I think the breaker is 5A. A 10A draw

   is indeed suspicious. The max draw on this wire

   is generally no more than 3 to 3.5 amps engine stopped

   and much less in flight.

 	  Quote: 	
		  Any ideas?  I think the internals might have failed.  Could there be a

cheap fix?


	


   Probably not. Shorted turns in the field winding

   are the most plausible hypothesis but I have a

   hard time figuring out how this might happen.



   You'll probably have to return it to PlanePower

   for diagnosis . . . but if you have MEASURED a

   10A draw before the breaker pops, then it's a

   certainty that something is wrong inside

   the alternator.



   Bob . . .

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