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Mechanics of adding resistors

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Michael Wynn

Joined: 10 Jan 2006
Posts: 148
Location: San Ramon, CA

Posted: Mon Jun 27, 2011 5:47 am Post subject: Mechanics of adding resistors

Hi all,

  

 I am wiring a Grand Rapids EIS 4000 into my RV 8.  The unit has a 4.8V  "exciter" circuit.  Two auxiliary inputs are for fuel tank sensors.  I  understand from the wiring diagram here

  

 http://f1.grp.yahoofs.com/v1/0H4ITpn8XkreroJCKrbKAiMAAupS245hbJv750-QGDWR_sM4xYTe_rS3WbvLLocO9yHTwpDwbZCoOirg3wW5zJBdnGsGgN0/File0002.pdf

  

 that I wire a 470 ohm resistor between the 4.8V exciter circuit and the  wire to the fuel tank sensor.  The other end of the fuel tank sensor goes  to ground.

  

 Since there are two circuits, one to each fuel tank, I had thought to  solder or crimp the two resistors to the exciter wire and then strip a half inch  of the wire from the EIS unit to the fuel sensor.  The ends of the  resistors would be soldered into the sensor wire and the joint covered in heat  shrink.

  

 I began to wonder how much heat would be generated and if I need to protect  this from other wires.  I wouldn't think there would be much heat since  there is little current in a sensor.

  

 Can anyone shed some light on the mechanics of how I should set this  up?

  

 Regards

  

 Michael Wynn

 RV 8 Wiring

 San Ramon, CA

  

  [quote][b]

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_________________
Michael Wynn
RV 8
San Ramon, CA

nuckolls.bob(at)aeroelect
Guest

Posted: Mon Jun 27, 2011 6:44 am Post subject: Mechanics of adding resistors

At 08:41 AM 6/27/2011, you wrote:

  

 Hi all,

  

 I am wiring a Grand Rapids EIS 4000 into my RV 8.  The unit has a 4.8V "exciter" circuit.  Two auxiliary inputs are for fuel tank sensors.  I understand from the wiring diagram here

  

  http://f1.grp.yahoofs.com/v1/0H4ITpn8XkreroJCKrbKAiMAAupS245hbJv750-QGDWR_sM4xYTe_rS3WbvLLocO9yHTwpDwbZCoOirg3wW5zJBdnGsGgN0/File0002.pdf

 

   I tried to open that link but was not successful . . .

  

 that I wire a 470 ohm resistor between the 4.8V exciter circuit and the wire to the fuel tank sensor.  The other end of the fuel tank sensor goes to ground.

  

 Since there are two circuits, one to each fuel tank, I had thought to solder or crimp the two resistors to the exciter wire and then strip a half inch of the wire from the EIS unit to the fuel sensor.  The ends of the resistors would be soldered into the sensor wire and the joint covered in heat shrink.



    Like this?



 [img]cid:7.1.0.9.0.20110627093341.02040838(at)aeroelectric.com.0[/img] 



 



    See:  http://www.aeroelectric.com/articles/Homeless/Homeless_Components.htm

 

  

 I began to wonder how much heat would be generated and if I need to protect this from other wires.  I wouldn't think there would be much heat since there is little current in a sensor.

   

    Correct. If there's a reason for selecting larger

    than necessary for electrical performance, it's for

    mechanical robustness. Consider 1/2 watt resistors

    for this task.



 

 

   Bob . . .

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rv8iator(at)gmail.com
Guest

Posted: Mon Jun 27, 2011 7:04 am Post subject: Mechanics of adding resistors

Hello Michael,



Just finished a similar install on a Dynon D180 and Rotax with multiple resistors for current loop sensors.   Choose a point in-line for the resistors that you can mechanically support the wire bundle.  Trim the resistor leads to about 1/2" slip multiple layers of heat shrink tubing onto the wires before assembly if unable to add heatshrink post assembly.   I soldered all connections.  Heatshrink tubing over each resistor, then bundle and larger heatshrink tubing.  Be sure to extend the heatshrink tubing 1" or further  beyond the connection for mechanical support.   The current the resistors is limiting is in the 10s of milliamps range and thus almost no power (heat) is dissapated.

 



Chris Stone

RV-8

Oregon



On Mon, Jun 27, 2011 at 6:41 AM,  <MLWynn(at)aol.com (MLWynn(at)aol.com)> wrote:

 [quote]      

 Hi all,

  

 I am wiring a Grand Rapids EIS 4000 into my RV 8.  The unit has a 4.8V  "exciter" circuit.  Two auxiliary inputs are for fuel tank sensors.  I  understand from the wiring diagram here

  

 http://f1.grp.yahoofs.com/v1/0H4ITpn8XkreroJCKrbKAiMAAupS245hbJv750-QGDWR_sM4xYTe_rS3WbvLLocO9yHTwpDwbZCoOirg3wW5zJBdnGsGgN0/File0002.pdf

   

 that I wire a 470 ohm resistor between the 4.8V exciter circuit and the  wire to the fuel tank sensor.  The other end of the fuel tank sensor goes  to ground.

  

 Since there are two circuits, one to each fuel tank, I had thought to  solder or crimp the two resistors to the exciter wire and then strip a half inch  of the wire from the EIS unit to the fuel sensor.  The ends of the  resistors would be soldered into the sensor wire and the joint covered in heat  shrink.

  

 I began to wonder how much heat would be generated and if I need to protect  this from other wires.  I wouldn't think there would be much heat since  there is little current in a sensor.

  

 Can anyone shed some light on the mechanics of how I should set this  up?

  

 Regards

  

 Michael Wynn

 RV 8 Wiring

 San Ramon, CA

  

   	  Quote: 	
		  



ist" target="_blank">http://www.matronics.com/Navigator?AeroElectric-List

tp://forums.matronics.com

_blank">http://www.matronics.com/contribution



	


[b]

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Michael Wynn

Joined: 10 Jan 2006
Posts: 148
Location: San Ramon, CA

Posted: Mon Jun 27, 2011 1:25 pm Post subject: Mechanics of adding resistors

Thanks, Bob

  

 You are right on top of everything, as usual.

  

 Michael Wynn

 Do Not Archive

  

  In a message dated 6/27/2011 7:45:17 A.M. Pacific Daylight Time,  nuckolls.bob(at)aeroelectric.com writes:

  	  Quote: 	
		  At 08:41    AM 6/27/2011, you wrote:

 

Hi all,

 

I am wiring a Grand    Rapids EIS 4000 into my RV 8.  The unit has a 4.8V "exciter"    circuit.  Two auxiliary inputs are for fuel tank sensors.  I    understand from the wiring diagram here

 

http://f1.grp.yahoofs.com/v1/0H4ITpn8XkreroJCKrbKAiMAAupS245hbJv750-QGDWR_sM4xYTe_rS3WbvLLocO9yHTwpDwbZCoOirg3wW5zJBdnGsGgN0/File0002.pdf



     I tried to open that link but was not successful . . .

 

that I    wire a 470 ohm resistor between the 4.8V exciter circuit and the wire to the    fuel tank sensor.  The other end of the fuel tank sensor goes to    ground.

 

Since there are two circuits, one to each fuel tank, I    had thought to solder or crimp the two resistors to the exciter wire and then    strip a half inch of the wire from the EIS unit to the fuel sensor.  The    ends of the resistors would be soldered into the sensor wire and the joint    covered in heat shrink.



   Like this?



    



   See: http://www.aeroelectric.com/articles/Homeless/Homeless_Components.htm



 

I    began to wonder how much heat would be generated and if I need to protect this    from other wires.  I wouldn't think there would be much heat since there    is little current in a sensor.

  

   Correct. If there's    a reason for selecting larger

   than necessary for electrical    performance, it's for

   mechanical robustness. Consider 1/2 watt    resistors

   for this task.

   

  Bob . . .

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_________________
Michael Wynn
RV 8
San Ramon, CA

nuckolls.bob(at)aeroelect
Guest

Posted: Mon Jun 27, 2011 3:17 pm Post subject: Mechanics of adding resistors

At 04:21 PM 6/27/2011, you wrote:

  	  Quote: 	
		   Thanks, Bob

  

 You are right on top of everything, as usual.

 	


   It's worthy of note that others had the same

   advice. If more than one individual has been-there-

   done-that, it MUST be a practical recipe for

   success.



 



 

   Bob . . .    [quote][b]

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