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Engine sensor ground

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vicster_26

Joined: 13 Oct 2007
Posts: 2

Posted: Sat Oct 13, 2007 11:32 am Post subject: Engine sensor ground

Hello,



I understand that in a single point ground system, those sensors that are connected to the engine case should have their ground returned from the instrument to the engine side of the firewall ground. A question here, with some of these new electronic engine analyzers where you have multiple sensors connecting to one instrument via a D-sub connector, how do you resolve the issue of returning the relevant ground back to engine side when the ground is grounded internally in the instrument.  In my case, most of the sensors are isolated from the engine except for the Oil Temp which is obviously threaded directly to the engine case.



I have a factory built airplane with very basic instrumentation and avionics, in fact it had just one old chunky radio and the avionics master switch is simply a 5amp switch type circuit breaker. Now that I am installing a few more avionics, is there any problems with connecting all of them to this one circuit breaker or perhaps running a bus from this switch/circuit breaker to separate circuit breakers for each avionics?



Thanks in advance

Vic

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nuckolls.bob(at)cox.net
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Posted: Sun Oct 14, 2007 10:22 am Post subject: Engine sensor ground

At 12:32 PM 10/13/2007 -0700, you wrote:



 	  Quote: 	
		  



Hello,



I understand that in a single point ground system, those sensors that are 

connected to the engine case should have their ground returned from the 

instrument to the engine side of the firewall ground. A question here, 

with some of these new electronic engine analyzers where you have multiple 

sensors connecting to one instrument via a D-sub connector, how do you 

resolve the issue of returning the relevant ground back to engine side 

when the ground is grounded internally in the instrument.  In my case, 

most of the sensors are isolated from the engine except for the Oil Temp 

which is obviously threaded directly to the engine case.


	


   Suggest you create and utilize an instrument panel

   ground bus to bring case grounded panel mounted

   stuff and associated ground wires to nearly common

   point. See Figure Z-15 and the collection of files

   in  . . .



http://www.aeroelectric.com/Pictures/Grounding/

 	  Quote: 	
		  I have a factory built airplane with very basic instrumentation and 

avionics, in fact it had just one old chunky radio and the avionics master 

switch is simply a 5amp switch type circuit breaker. Now that I am 

installing a few more avionics, is there any problems with connecting all 

of them to this one circuit breaker or perhaps running a bus from this 

switch/circuit breaker to separate circuit breakers for each avionics?


	


   For just one radio, the "avionics master" switch

   was a waste of time and reduction in reliability.

   In fact, if you're only going to install a few radios

   total, I'll suggest you ditch the AMS and just

   turn the radios on/off as part of your checklist

   ritual.



   Bob . . .



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

        ( "Problems are the price of progress. )

        ( Don't bring me anything but trouble. )

        ( Good news weakens me."               )

        (              -Charles F. Kettering-  )

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

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