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S704-1

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Neal.George(at)hurlburt.a
Guest

Posted: Thu Aug 17, 2006 8:43 pm Post subject: S704-1

Good Morning Bob - 



I'm wiring my RV-7 based on Z-13/8.



 	  Quote: 	
		  From the Refernece section of your website,

http://www.aeroelectric.com/articles/s704inst.jpg shows a 1N4005 diode
	


across the Crowbar leads.



Z-13/8 shows the S704-1 Aux Alternator relay connected directly to the

Crowbar unit, no diode.  Likewise, the drawings from B&C make no mention of

the diode.  



What's the purpose of the diode, and has it been incoorptated into the

Crowbar, or do I need to hang it off the relay?



Neal

RV-7 N8ZG

Navarre, FL

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nuckollsr(at)cox.net
Guest

Posted: Fri Aug 18, 2006 6:31 am Post subject: S704-1

At 08:22 AM 8/17/2006 -0500, you wrote:



 	  Quote: 	
		  

<Neal.George(at)Hurlburt.AF.MIL>



Good Morning Bob -



I'm wiring my RV-7 based on Z-13/8.



 >From the Refernece section of your website,

http://www.aeroelectric.com/articles/s704inst.jpg shows a 1N4005 diode

across the Crowbar leads.



Z-13/8 shows the S704-1 Aux Alternator relay connected directly to the

Crowbar unit, no diode.  Likewise, the drawings from B&C make no mention of

the diode.



What's the purpose of the diode, and has it been incoorptated into the

Crowbar, or do I need to hang it off the relay?


	




    The purpose of this diode is described in:



http://www.aeroelectric.com/articles/spikecatcher.pdf

    The photo you cited above is a generic install recommendation

    for any relay in the style of S704-1 device pictured.

    Except for rare cases, it doesn't hurt to install a spike

    suppression diode, indeed many manufacturers of military

    spec relays build the network right into the relay. See

    schematics on page 3 of:



http://www.teledynerelays.com/pdf/electromechanical/114.pdf



    The diode was not included in the wiring diagram for

    Z-13/8 and similar because it was not useful to the

    design  . . . but it doesn't hurt for the diode to

    be there.



    Bob . . .

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