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rparigoris
Joined: 24 Nov 2009
Posts: 780
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 Posted: Mon Aug 31, 2020 7:47 pm Post subject: How do you turn 13 D-Sub pins into 5 wires? |
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Hi Group I have 13 pins on a D-Sub connector coming from Avionics that need to go to single point ground firewall field of tabs. I need to turn into ~ 5 wires that will go to field of tabs. I think I remember seeing how to do this but can't find it. Thx. Ron P.
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ceengland7(at)gmail.com
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| Posted: Tue Sep 01, 2020 5:46 am Post subject: How do you turn 13 D-Sub pins into 5 wires? |
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On Mon, Aug 31, 2020 at 10:58 PM rparigoris <rparigor(at)hotmail.com (rparigor(at)hotmail.com)> wrote:
| Quote: | --> AeroElectric-List message posted by: "rparigoris" <rparigor(at)hotmail.com (rparigor(at)hotmail.com)>
Hi Group I have 13 pins on a D-Sub connector coming from Avionics that need to go to single point ground firewall field of tabs. I need to turn into ~ 5 wires that will go to field of tabs. I think I remember seeing how to do this but can't find it. Thx. Ron P. |
Hi Ron,
Are you talking about the 'panel ground' Dsub described in Z15L1 in the book?
I used a slightly different technique. I used a solder style female connector for the ground buss, and soldered a larger gauge wire bridged across all the pins, with a larger gauge wire soldered to each end of the Dsub, and run to the firewall ground. Not '5 wire' redundant, but still redundant, and all panel ground currents can be safely/adequately carried by either of the two bigger wires to the firewall.
Regardless of the number of ground wires going back to the firewall, the drawing shows all tied to a ground 'bus'. That would mean that all the pins in the Dsub should be common to each other at the Dsub. If you used a regular crimp style Dsub on the panel, you can get to the same point by using 'ballast' wires, ~6" long, from each pin. All the wires would be brought together at their free ends, and the 5 ground wires would attach there. For something that big, I'd solder/heat shrink. But if you prefer all-crimps, you can do it in 'stages', but having multiple 'Y's with a convenient number of wires (3 or 4) in each crimp, and those 'outputs' gathered into a last crimp to mate with your 5 ground wires to the firewall. Only downside to this is that the final sum-point to the 5 ground wires is a single point of failure (if you do a really lousy job in making up that joint). 
Note that if you used subgroups of 3 or 4 pins to each of the 5 grounds back to the firewall (without tying all the pins together at/near the panel ground Dsub), and one of the 5 wires breaks, you'd lose ground for all the devices grounded through that particular wire.
Hope that gives you some ideas on how to proceed,
Charlie
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johnbright
Joined: 14 Dec 2011
Posts: 165
Location: Newport News, VA
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| Posted: Tue Sep 01, 2020 5:59 am Post subject: Re: How do you turn 13 D-Sub pins into 5 wires? |
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Ref "Avionics and Panel Ground System" in chapter 18, page 18-11, of the Aeroelectric Connection book.
http://www.aeroelectric.com/Books/Connection/
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