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Infinity Stick Grip switch grounding?

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Allen Fulmer

Joined: 10 Jan 2006
Posts: 79
Location: Alexander City, AL

Posted: Mon Jan 12, 2009 10:48 am Post subject: Infinity Stick Grip switch grounding?

Many of the push button and/or toggle switches on the Infinity grips have

two wires and most functions they control simply require a connection to a

ground when activated (like PushToTalk, AP disconnect, Freq swap, etc.).

Plus the trim switch (coolie hat) has one connection labeled common or

ground.



My question is, as a general rule, would it be better to connect those

switches (needing a ground) to the airframe (under the seat somewhere in

this case) or carry a single ground wire back to the forest of tabs (or

avionics ground "bus")?



Does it matter?



Thanks,



Allen Fulmer

RV7 Wiring/Plumbing

Eggenfellner Subaru E6T on firewall

N808AF reserved

Alexander City, AL

256-329-2001

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_________________
RV7 QB Fuselage
Eggenfellner H6 on orde
N808AF reserved
Alexander City, AL

trigo(at)mail.telepac.pt
Guest

Posted: Mon Jan 12, 2009 11:16 am Post subject: Infinity Stick Grip switch grounding?

Hi Allen  

   

(From another Subbie...)  

   

I am not an EE or a specialist, but I did connect all grip ground wires to one ground bus under the seat, and then carried a single ground from that bus to the firewall forest of tabs.  

It works flawlessly, but I did some tests grounding each of the wires to the airframe locally and worked good as well. I believe the only one that can cause a ground loop problem would be the ground wire from the PTT.  

   

Carlos  

   

   

[quote] --

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nuckolls.bob(at)aeroelect
Guest

Posted: Mon Jan 12, 2009 1:31 pm Post subject: Infinity Stick Grip switch grounding?

At 12:45 PM 1/12/2009, you wrote:

 	  Quote: 	
		  



Many of the push button and/or toggle switches on the Infinity grips have

two wires and most functions they control simply require a connection to a

ground when activated (like PushToTalk, AP disconnect, Freq swap, etc.).

Plus the trim switch (coolie hat) has one connection labeled common or

ground.



My question is, as a general rule, would it be better to connect those

switches (needing a ground) to the airframe (under the seat somewhere in

this case) or carry a single ground wire back to the forest of tabs (or

avionics ground "bus")?



Does it matter?


	


  These are control lines, not signal lines. Further,

  they carry very little current. They will perform

  as advertised with local ground. The only caveat

  might suggest that each ground wire from each

  switch get its own ground wire through the maintenance

  connector . . . and have it's own terminal to the ground

  stud (8-32 screw).



  This will prevent loss of one wire causing loss of

  all control functions on the stick that use a ground

  for operation.

        Bob . . .



        ----------------------------------------)

        ( . . .  a long habit of not thinking   )

        ( a thing wrong, gives it a superficial )

        ( appearance of being right . . .       )

        (                                       )

        (                  -Thomas Paine 1776-  )

        ----------------------------------------

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