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Military style external power receptacle question

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johngoodman

Joined: 18 Sep 2006
Posts: 530
Location: GA

Posted: Sun May 24, 2009 1:15 pm Post subject: Military style external power receptacle question

Looking at Bob's wiring diagram in Appendix Z, 31A, for a military style external power receptacle, what is the function of the smaller third pin? Just guessing by the schematic it's hot power, just like the middle pin.

Inquiring minds want to know........



John

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#40572 Phase One complete in 2011

bobmeyers(at)meyersfamily
Guest

Posted: Sun May 24, 2009 2:12 pm Post subject: Military style external power receptacle question

It's a sense pin and it is hot, the same as the center pin.  Without  

the plug, it is not connected to the center pin. It can be used as the  

drawing shows, to separate the source of power activating the  

contactor from what is flowing through the contactor.



This allows you a way to take action on this pin going hot.  In the  

case of Z31A, that drawing shows polarity and overvoltage sensing  

being done from that pin.



Bob Meyers



Building Sonex 982SX Web Site Index http://meyersfamily.org/Sonex982.html



On May 24, 2009, at 4:15 PM, johngoodman wrote:



 	  Quote: 	
		   

 >



 Looking at Bob's wiring diagram in Appendix Z, 31A, for a military  

 style external power receptacle, what is the function of the smaller  

 third pin? Just guessing by the schematic it's hot power, just like  

 the middle pin.

 Inquiring minds want to know........



 John



 --------

 #40572 QB Fuselage, wings finished. Finish Kit started.

 N711JG reserved





 Read this topic online here:



 http://forums.matronics.com/viewtopic.php?p 45177#245177

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johngoodman

Joined: 18 Sep 2006
Posts: 530
Location: GA

Posted: Sun May 24, 2009 2:23 pm Post subject: Re: Military style external power receptacle question

Thanks for the response. I assume that the military and airlines use the pin for the same thing.

John

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#40572 Phase One complete in 2011

plevyakh

Joined: 10 Jan 2011
Posts: 39

Posted: Tue Sep 18, 2012 8:12 am Post subject: Re: Military external power receptacle (3rd pin wire size?)

Guys,

What size wire should be used for the feed from the smaller third pin of the military style power receptacle to the (+) OVM sensing connection post?  Since mine is in the engine side, I was going to use 18AWG.  Is this acceptable?



Thanks,

Howard

On May 24, 2009, at 4:15 PM, johngoodman wrote:



 Looking at Bob's wiring diagram in Appendix Z, 31A, for a military  

 style external power receptacle, what is the function of the smaller  

 third pin? Just guessing by the schematic it's hot power, just like  

 the middle pin.

 Inquiring minds want to know........



 John



 --------

 #40572 QB Fuselage, wings finished. Finish Kit started.

 N711JG reserved



It's a sense pin and it is hot, the same as the center pin.  Without  

the plug, it is not connected to the center pin. It can be used as the  

drawing shows, to separate the source of power activating the  

contactor from what is flowing through the contactor.



This allows you a way to take action on this pin going hot.  In the  

case of Z31A, that drawing shows polarity and overvoltage sensing  

being done from that pin."



 Read this topic online here:



 http://forums.matronics.com/viewtopic.php?p 45177#245177

- The Matronics AeroElectric-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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

_________________
Howard Plevyak
GlaStar / Cincinnati, Ohio

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