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Alternator Breaker Pop

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DaveG601XL

Joined: 27 Oct 2006
Posts: 351
Location: Cincinnati, Oh

Posted: Thu Mar 27, 2008 5:22 pm Post subject: Alternator Breaker Pop

I am performing my first engine runs with a Jabiru 3300 powered Zenith 601XL.  This is a PM alternator and my wiring is based on the Z16 architecture using the S704-1 alternator control and crowbar OV protection.  So far everything is working just fine with one exception.  Of the 10 or so engine starts I have made, twice I found the 5A alternator breaker popped.  This is the breaker between the main bus and the master switch.  On both occasions, the engine was at idle and I shut it down then re-started it after a few moments.  It was after the start that I noticed the popped breaker.



I don't know if the breaker popped on shutdown or during the re-start.  In either case I was able to reset the breaker and all appeared to be OK.



Anybody have any ideas on what is going on here?  All the volt and amp numbers I have seen are "in the green."  Do shutdown or start-ups cause nuisance pops? 



Thanks,



DaveG

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David Gallagher
Cincinnati, OH area

user9253

Joined: 28 Mar 2008
Posts: 1925
Location: Riley TWP Michigan

Posted: Fri Mar 28, 2008 8:31 am Post subject: Re: Alternator Breaker Pop

A wire could be intermittently shorting to ground or there could be an over-voltage condition.  Shut off all expensive electronics, then try disconnecting the wire at the master switch that goes to the over-voltage module and see if the problem goes away.  If it does, then there could be an over-voltage condition.  The battery should help  prevent voltage spikes.  Does the battery contactor remain energized until the engine stops turning?

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Joe Gores

nuckolls.bob(at)cox.net
Guest

Posted: Fri Mar 28, 2008 8:15 pm Post subject: Alternator Breaker Pop

At 06:22 PM 3/27/2008 -0700, you wrote:



 	  Quote: 	
		  

<david.m.gallagher(at)ge.com>



I am performing my first engine runs with a Jabiru 3300 powered Zenith 

601XL.  This is a PM alternator and my wiring is based on the Z16 

architecture using the S704-1 alternator control and crowbar OV 

protection.  So far everything is working just fine with one 

exception.  Of the 10 or so engine starts I have made, twice I found the 

5A alternator breaker popped.  This is the breaker between the main bus 

and the master switch.  On both occasions, the engine was at idle and I 

shut it down then re-started it after a few moments.  It was after the 

start that I noticed the popped breaker.



I don't know if the breaker popped on shutdown or during the re-start.  In 

either case I was able to reset the breaker and all appeared to be OK.



Anybody have any ideas on what is going on here?  All the volt and amp 

numbers I have seen are "in the green."  Do shutdown or start-ups cause 

nuisance pops?


	


   The crowbar ov protection module has been known to

   trip on system noises. I've helped a number of builders

   track down a noise source that was irritating the

   OVM-14. How long have you had your OV module? There

   were some changes about 4-5 years ago that made them

   more resistant to all but the worst noises.



   This is a pretty rare condition. It could also

   be that your particular OVM has a problem. You

   can send it to me for a checkout and update too

   if you've had it a very long time.



   I've not built and sold these for about 6 years

   but I can help you tame the little beast.



   Bob . . .

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DaveG601XL

Joined: 27 Oct 2006
Posts: 351
Location: Cincinnati, Oh

Posted: Sat Mar 29, 2008 3:48 am Post subject: Re: Alternator Breaker Pop

Bob,



I have purchased all of my electrical parts since September so barring any of it sitting on B&C's shelves for a long time, everything should be fairly new.  I have not had the chance to go over the system wire-by-wire yet.  I will report back after I have had the chance.  



Thanks,

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David Gallagher
Cincinnati, OH area

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