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Z-17 OVPM Question

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corton@charter.net

Joined: 22 Sep 2010
Posts: 1

Posted: Wed Sep 22, 2010 6:46 pm Post subject: Z-17 OVPM Question

Hi, All;



I'm trying to adapt wiring diagram Z-17 for my Sonex, which has a 20A permanent magnet alternator.



I purchased the B&C OVPM kit, which includes the yellow ALT / OV warning lamp. 



My question is: is there a way to connect the warning light someplace? I cannot connect it to the NC post of the alternator cutout relay because the common post is connected directly to the battery. I *could* connect the common post to the switched side of the batt/alt master switch, but then I'd have a 12ga wire coming in to the panel to the switch, then going back out to the firewall. The charging circuit would then come from the alternator, thru the relay, to the master switch, then back to the battery.



I'd like to minimize the 12ga runs; I'm also concerned about running alternator output thru the master switch.



Any suggestions?

Many thanks!

Carl

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nuckolls.bob(at)aeroelect
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Posted: Thu Sep 23, 2010 6:59 am Post subject: Z-17 OVPM Question

At 09:46 PM 9/22/2010, you wrote:

 	  Quote: 	
		  

<corton(at)charter.net>



Hi, All;



I'm trying to adapt wiring diagram Z-17 for my Sonex, which has a 

20A permanent magnet alternator.



I purchased the B&C OVPM kit, which includes the yellow ALT / OV warning lamp.


	


   The primary interpretation for that light is

   "ALTERNATOR OFF". I could be off because you

   had an OV event . . . or it could be OFF because

   you didn't turn it ON. For a PM alternator that

   size, suggest you leave it out.



   Now, you SHOULD have some form of active notification

   of LOW voltage. See Figure Z-20.



 	  Quote: 	
		  My question is: is there a way to connect the warning light 

someplace? I cannot connect it to the NC post of the alternator 

cutout relay because the common post is connected directly to the 

battery. I *could* connect the common post to the switched side of 

the batt/alt master switch, but then I'd have a 12ga wire coming in 

to the panel to the switch, then going back out to the firewall. The 

charging circuit would then come from the alternator, thru the 

relay, to the master switch, then back to the battery.


	


   Not recommended.



 	  Quote: 	
		  I'd like to minimize the 12ga runs; I'm also concerned about running 

alternator output thru the master switch.


	


   With a 20A alternator, you COULD consider tossing

   of 0.8A of alternator output to keep a battery

   contactor closed.  Alternatively, consider a

   ROBUST on-on-on switch like a



http://www.newark.com/honeywell-s-c/2nt1-10/toggle-switch/dp/19C1911



   Bob . . .

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