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AV 30 Wiring

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farmrjohn

Joined: 31 Dec 2018
Posts: 54

Posted: Wed Sep 02, 2020 1:32 pm Post subject: AV 30 Wiring

Now that the AV 30 has STC approval for certificated airplanes I have some questions on the wiring differences. 

 

The experimental say power is to be from the battery or essential bus only, the "approved" manual says power is from the avionics bus or main master relay.  Can the experimental version also be powered from the avionics bus?



The certified calls for a 3/16" braided ground strap from the of the d-sub back shell, maximum of 8".  What would be a similar sized stranded wire, and would the also be a good idea for the experimental version?



On the wiring diagrams some of the shielded wire symbols have an X in them.  Does this indicate twisted pair?

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farmrjohn

Joined: 31 Dec 2018
Posts: 54

Posted: Tue Sep 08, 2020 3:21 pm Post subject: Re: AV 30 Wiring

Bump, primarily to re-ask the question about the diagrams with the "X" in the shield symbol. Thanks, John

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nuckolls.bob(at)aeroelect
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Posted: Tue Sep 08, 2020 5:28 pm Post subject: AV 30 Wiring

At 06:21 PM 9/8/2020, you wrote:

  	  Quote: 	
		  --> AeroElectric-List message posted by: "farmrjohn" <faithvineyard(at)yahoo.com>



 Bump, primarily to re-ask the question about the diagram for the certified version with the "X" in the shield symbol.  Thanks, John 	


  I would infer that to indicate twisted conductors . . .

  but then I think one would be hard pressed to find

  a shielded pair that was not twisted.



 

 

   Bob . . .

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donjohnston

Joined: 13 Dec 2009
Posts: 231

Posted: Wed Sep 09, 2020 1:28 pm Post subject: Re: AV 30 Wiring

I would agree.  On the second drawing, the only place TPS is shown is on those wires with the "X".



Although it does appear the shields are grounded in two places.  I thought the idea was to always ground the shield at one end.

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nuckolls.bob(at)aeroelect
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Posted: Thu Sep 10, 2020 7:32 am Post subject: AV 30 Wiring

At 04:28 PM 9/9/2020, you wrote:

  	  Quote: 	
		  --> AeroElectric-List message posted by: "donjohnston" <don(at)velocity-xl.com>



 I would agree.  On the second drawing, the only place TPS is shown is on those wires with the "X".



 Although it does appear the shields are grounded in two places.  I thought the idea was to always ground the shield at one end. 	


   Yes . . . but.



   If the design goal for shielding wires

   is to BREAK and electro-static coupling

   mode between potential antagonist/victim

   wires, then yes . . . connect shield to

   one ground only.



   SOME installations exploit the shield as

   part of the energy management goal. One

   example can be seen in the Z-figures where

   I recommend GROUNDING a p-lead shield at

   the magneto end then using the shield

   to provide a GROUND PATH for the switch

   at the other end.  Some authors have

   suggested that p-leads need to be shield

   grounded at BOTH ends which has no foundation

   in physics and raises risks for some ground

   loop issues.



   I've also used the shield as a return

   path for incandescent bulbs illuminating

   a whisky compass. Providing a coaxially

   concentric out-and-back path for bulb

   currents cancels magnetic fields around

   the wire and prevents illumination induced

   heading errors.



   The best thing to do is follow the

   manufacturer's installation instructions.

   I cannot assert they are always 'golden'

   but there just might be a good reason

   for doubling up shield terminations.

  



 



 

   Bob . . .

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