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OV protection for Alt energized contactor

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nuckolls.bob(at)aeroelect
Guest

Posted: Tue Nov 23, 2010 6:06 am Post subject: OV protection for Alt energized contactor

At 02:37 PM 11/22/2010, you wrote:

 	  Quote: 	
		  



My Stby alternator energizes its contactor, per the attached drawing.

How do I provide OV protection to the circuit with an OVM 14?



Thanks,

John



http://forums.matronics.com//files/stby_alt_ov_protection_study_417.pdf


	


   The drawing you posted won't work. See



http://www.aeroelectric.com/PPS/Adobe_Architecture_Pdfs/Z11M.pdf



   for an exemplar technique for adding ov protection to

   an externally regulated alternator. No b-lead contactor

   is necessary.

   Bob . . .

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jonlaury

Joined: 06 Nov 2006
Posts: 336

Posted: Tue Nov 23, 2010 1:00 pm Post subject: Re: OV protection for Alt energized contactor

Bob,



The B lead contactor was to avoid having an always hot 8 ga wire that goes across the top of my engine to the Stby 40a alternator. Maybe a large diode is a simpler solution.



What is it that won't work in the drawing? The wiring of the Ford regulator was clipped and pasted from Z-13. Is it the alternator energized contactor?



The attached uses your exemplar OV reference and shows the entire schematic.



John

John

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Z8 w-SB ALT,GPJ-Rev C.pdf

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nuckolls.bob(at)aeroelect
Guest

Posted: Tue Nov 23, 2010 2:53 pm Post subject: OV protection for Alt energized contactor

At 03:00 PM 11/23/2010, you wrote:

 	  Quote: 	
		  



Bob,



The B lead contactor was to avoid having an always hot 8 ga wire 

that goes across the top of my engine to the Stby 40a alternator. 

Maybe a large diode is a simpler solution.


	


   Oh yeah, I think we had this discussion before. That

   contactor would go right next to the battery contactor.

   Energize it with power taken from the alternator control

   switch that connects the Bus to the regulator.

   Bob . . .

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nuckolls.bob(at)aeroelect
Guest

Posted: Tue Nov 23, 2010 2:57 pm Post subject: OV protection for Alt energized contactor

At 01:49 PM 11/23/2010, you wrote:

 	  Quote: 	
		  



Looks to me if the S terminal of your Ford regulator senses too high a

voltage for any reason then it will cut all power to the F terminal of your

alternator.  Problem with this set up is that it doesn't give you an

indication that you have gone into an OV situation.


	


   OV is a transient event . . . perhaps 100 mS long followed

   by a very long LV condition which flashes a light.

   Bob . . .

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Float Flyr

Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland

Posted: Wed Nov 24, 2010 4:44 pm Post subject: OV protection for Alt energized contactor

What causes the light to flash?  I don't even see an enunciator light in the

schematic.



Noel



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_________________
Noel Loveys
Kitfox III-A
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jonlaury

Joined: 06 Nov 2006
Posts: 336

Posted: Thu Nov 25, 2010 1:59 pm Post subject: Re: OV protection for Alt energized contactor

 	  Quote: 	
		  What causes the light to flash? I don't even see an enunciator light in the

schematic. 	




Noel, 



Look at the schematic that I posted in this thread (that Bob started as a parallel to the original).



The 9005 LVM is on the far left of the schematic. I assume that the diode with the circle around it is a LED symbol. I usually see LED's indicated with a zig-zag arrow.



J

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