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1 Wire vs. 3Wwire alternators

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cdnch701builder

Joined: 21 Aug 2010
Posts: 21
Location: Canada

Posted: Tue Nov 22, 2011 9:46 am Post subject: 1 Wire vs. 3Wwire alternators

I need some help here with alternators!    What is the difference between a 1 wire and a 3 wire 

system?  



Can a 1 wire setup be shut down with a switch as per over voltage protection... or does it have 

to be a 3 wire?



Thanks 

Ron

_________________
cdnch701builder

nuckolls.bob(at)aeroelect
Guest

Posted: Tue Nov 22, 2011 11:30 am Post subject: 1 Wire vs. 3Wwire alternators

At 11:43 AM 11/22/2011, you wrote:

 	  Quote: 	
		  



I need some help here with alternators!    What is the difference 

between a 1 wire and a 3 wire

system?


	


    I'm not sure there's a uniform convention for

    1 versus 2 versus 3 wire alternators. The

    1-wire alternators I see for boats, RVs and

    utility vehicles have regulators built in. They

    have ONE b-lead that connects to the system and

    they automatically shut down internally when

    the alterantor is not turning.



 	  Quote: 	
		  Can a 1 wire setup be shut down with a switch as per over voltage protection


	


    No



 	  Quote: 	
		  ... or does it have

to be a 3 wire?


	




   It certainly needs to have more than one wire, the

   second of which offers absolute control over field

   excitation. Check out B&C or Plane Power. They've

   provided for satisfaction of the legacy philosophy for

   putting alternators on airplanes.

   Bob . . .

cdnch701builder

Joined: 21 Aug 2010
Posts: 21
Location: Canada

Posted: Thu Dec 01, 2011 1:19 pm Post subject: 1 Wire vs. 3Wwire alternators

Thanks bob...



I have a 3 wire internally regulated alternator... that I would like to convert to external 

regulator!  



Is there any info online somewhere that provides instructions to do the conversion?  I have 

been searching and I cannot find!



Ron

:--)> 

:--)> <nuckolls.bob(at)aeroelectric.com>

:--)>

:--)> At 11:43 AM 11/22/2011, you wrote:

:--)>:--)> 

:--)>:--)>

:--)>:--)> I need some help here with alternators!    What is the difference

:--)>:--)> between a 1 wire and a 3 wire

:--)>:--)> system?

:--)>:--)>

:--)> I'm not sure there's a uniform convention for

:--)> 1 versus 2 versus 3 wire alternators. The

:--)> 1-wire alternators I see for boats, RVs and

:--)> utility vehicles have regulators built in. They

:--)> have ONE b-lead that connects to the system and

:--)> they automatically shut down internally when

:--)> the alterantor is not turning.

:--)>

:--)>:--)> Can a 1 wire setup be shut down with a switch as per over voltage protection

:--)>:--)>

:--)> No

:--)>

:--)>:--)> ... or does it have

:--)>:--)> to be a 3 wire?

:--)>:--)>

:--)>

:--)> It certainly needs to have more than one wire, the

:--)> second of which offers absolute control over field

:--)> excitation. Check out B&C or Plane Power. They've

:--)> provided for satisfaction of the legacy philosophy for

:--)> putting alternators on airplanes.

:--)>

:--)>

:--)> Bob . . .

:--)>

:--)>

http://www.matronics.com/Navigator?AeroElectric-List

_________________
cdnch701builder

nuckolls.bob(at)aeroelect
Guest

Posted: Thu Dec 01, 2011 6:22 pm Post subject: 1 Wire vs. 3Wwire alternators

At 03:13 PM 12/1/2011, you wrote:

 	  Quote: 	
		  



Thanks bob...



I have a 3 wire internally regulated alternator... that I would like 

to convert to external

regulator!



Is there any info online somewhere that provides instructions to do 

the conversion?  I have

been searching and I cannot find!


	


   It varies from one brand and model to the next. An

   alternator repair shop could open it up and easily

   identify the means by which the internal regulator

   could be by-passed. I've seen some articles but don't

   recall now where . . . Sorry.



   Perhaps somebody here on the List will recall some

   exemplar articles.

   Bob . . .

jonlaury

Joined: 06 Nov 2006
Posts: 336

Posted: Fri Dec 02, 2011 7:44 am Post subject: Re: 1 Wire vs. 3Wwire alternators

Ron,

Try this



http://home.earthlink.net/~timrv6a/alternator.htm



Good Luck,

John

cdnch701builder

Joined: 21 Aug 2010
Posts: 21
Location: Canada

Posted: Fri Dec 02, 2011 9:17 am Post subject: 1 Wire vs. 3Wwire alternators

Thanks John... my alternator is a 40A  Denzo 3 wire.  It's pretty hard to make out from the 

photos!



Ron



:--)> 

:--)>

:--)> Ron,

:--)> Try this

:--)>

:--)> http://home.earthlink.net/~timrv6a/alternator.htm

:--)>

:--)> Good Luck,

:--)> John

:--)>

:--)>

:--)> Read this topic online here:

:--)>

:--)> http://forums.matronics.com/viewtopic.php?p=360068#360068

:--)>

:--)>

:--)> AeroElectric-List Email Forum -

:--)> MATRONICS WEB FORUMS -

:--)> http://www.matronics.com/contribution

_________________
cdnch701builder

user9253

Joined: 28 Mar 2008
Posts: 1927
Location: Riley TWP Michigan

Posted: Fri Dec 02, 2011 9:28 am Post subject: Re: 1 Wire vs. 3Wwire alternators

Here is another link to modifying an alternator:

http://www.eaa.org/experimenter/articles/2009-09_howto_alternator.asp

Joe

_________________
Joe Gores

mrspudandcompany(at)veriz
Guest

Posted: Fri Dec 02, 2011 9:42 am Post subject: 1 Wire vs. 3Wwire alternators

 	  Quote: 	
		  I have a 3 wire internally regulated alternator... that I would like 

to convert to external

regulator!



				Here is one from the EAA Website
	




	

http://www.eaa.org/experimenter/articles/2009-09_howto_alternator.asp



				Roger

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cdnch701builder

Joined: 21 Aug 2010
Posts: 21
Location: Canada

Posted: Fri Dec 02, 2011 10:04 am Post subject: 1 Wire vs. 3Wwire alternators

Thanks Roger...

Ron



:--)>:--)> I have a 3 wire internally regulated alternator... that I would like to

:--)>:--)> convert to external regulator!

:--)>:--)>

:--)> Here is one from the EAA Website

:--)>

:--)>

:--)> http://www.eaa.org/experimenter/articles/2009-09_howto_alternator.asp

:--)>

:--)> Roger

_________________
cdnch701builder

cdnch701builder

Joined: 21 Aug 2010
Posts: 21
Location: Canada

Posted: Fri Dec 02, 2011 10:04 am Post subject: 1 Wire vs. 3Wwire alternators

Thanks Joe...



That is for a 1 wire, I have a 3 wire... is there much difference?



Ron



:--)> 

:--)>

:--)> Here is another link to modifying an alternator:

:--)> http://www.eaa.org/experimenter/articles/2009-09_howto_alternator.asp Joe

:--)>

:--)> --------

:--)> Joe Gores

:--)>

:--)>

:--)> Read this topic online here:

:--)>

:--)> http://forums.matronics.com/viewtopic.php?p=360075#360075

:--)>

:--)>

:--)> AeroElectric-List Email Forum -

:--)> MATRONICS WEB FORUMS -

:--)> http://www.matronics.com/contribution

_________________
cdnch701builder

user9253

Joined: 28 Mar 2008
Posts: 1927
Location: Riley TWP Michigan

Posted: Sat Dec 03, 2011 7:48 am Post subject: Re: 1 Wire vs. 3Wwire alternators

cdnch701builder

Ron,

Are you using a Viking engine?

I am no alternator expert.  But if your alternator has 3 wires, One of them could be used for enabling the alternator.  The over-voltage protection should be in series with that wire.  There could be an internal regulator failure mode that does not respond to removing power from that wire.  The safest way is to remove the internal regulator and use an external one.

  Many builders are reluctant to modify a perfectly good working alternator in order to achieve over-voltage protection.  An over-voltage condition is unlikely but could be very expensive if it happens.  Some modern avionics are able to operate with supply voltages in the range of 10 to30.  They are less likely to be damaged.  In case of an over-voltage condition, an alternator with an ampacity that matches the expected aircraft load will not generate as high of a voltage as an over-sized alternator will.

Joe

_________________
Joe Gores

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