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grounding mag p lead shield...which side?

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bob.verwey(at)gmail.com
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Posted: Fri Jul 31, 2015 3:03 am Post subject: grounding mag p lead shield...which side?

switch side or mag side?



  [quote][b]

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ceengland7(at)GMAIL.COM
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Posted: Fri Jul 31, 2015 5:42 am Post subject: grounding mag p lead shield...which side?

On 7/31/2015 6:01 AM, Bob Verwey wrote:

     

      	  Quote: 	
		                  switch side           or mag side?

       

       

     	
     Suspend normal thought about shields when looking at magnetos.

     

     The shield is the return path to short out the mag when the mag     switch is 'off' (note the quotes). 

     http://www.aeroelectric.com/articles/MagnetoSwitchOptions.pdf

     

     Center conductor to the points in the mag, shield grounded to the     mag case.

     

     At the other end, center conductor to one terminal of your mag     switch, and the shield to the other terminal. When the switch is     *closed* (continuity across the terminals), the mag is *off*. When     the switch is *open* (off, in normal terminology), the mag is *on*.

      [quote][b]

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JOHN TIPTON

Joined: 17 Sep 2006
Posts: 239
Location: Torquay - England

Posted: Fri Jul 31, 2015 6:00 am Post subject: grounding mag p lead shield...which side?

Correct: that is why we are told (this side of the pond anyway) during our training to treat the prop as always being live,  just in case the grounded (mag switches in the off position) wire 'isn't' grounded



John



Sent from my iPad



     ----x--O--x----



[quote] On 31 Jul 2015, at 02:43 pm, Charlie England <ceengland7(at)GMAIL.COM> wrote:

 

> On 7/31/2015 6:01 AM, Bob Verwey wrote:

> switch side or mag side?

 Suspend normal thought about shields when looking at magnetos.

 

 The shield is the return path to short out the mag when the mag switch is 'off' (note the quotes). 

 http://www.aeroelectric.com/articles/MagnetoSwitchOptions.pdf

 

 Center conductor to the points in the mag, shield grounded to the mag case

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ceengland7(at)gmail.com
Guest

Posted: Fri Jul 31, 2015 12:34 pm Post subject: grounding mag p lead shield...which side?

I should have added:

       

       Be sure to check the switch for 'closed' position (continuity       between terminals) *before* hooking up the mag wires. A regular       ohm meter can't tell the difference between shorted terminals of       the switch turned on, and the very low DC resistance of the mag's       coil primary winding (that's where the P-leads are connected) when       the switch is switched open.

       

       If you're using regular SPST toggle switches as mag switches, just       mount them 'upside down' so that the switch's 'on' label is on the       bottom.

       

       On 7/31/2015 8:59 AM, John Tipton wrote:

     

     [quote]              Correct: that is why we are told (this side of the pond         anyway) during our training to treat the prop as always being         live,  just in case the grounded (mag switches in the off         position) wire 'isn't' grounded

       

       

       John

         

         Sent from my iPad         

         

              ----x--O--x----

       

       

         On 31 Jul 2015, at 02:43 pm, Charlie England <[url=mailto:ceengland7(at)GMAIL.COM]ceengland7(at)GMAIL.COM (ceengland7(at)GMAIL.COM)[/url]>         wrote:

         

       

        	  Quote: 	
		                                 On 7/31/2015 6:01 AM, Bob Verwey             wrote:

           

            	  Quote: 	
		                              switch                 side or mag side?

             

             

           	
           Suspend normal thought about shields when looking at magnetos.

           

           The shield is the return path to short out the mag when the           mag switch is 'off' (note the quotes). 

           http://www.aeroelectric.com/articles/MagnetoSwitchOptions.pdf

           

           Center conductor to the points in the mag, shield grounded to           the mag case.

           

           At the other end, center conductor to one terminal of your mag           switch, and the shield to the other terminal. When the switch           is *closed* (continuity across the terminals), the mag is           *off*. When the switch is *open* (off, in normal terminology),           the mag is *on*.

            	  Quote: 	
		  

	
         

       

	
     [b]

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bob.verwey(at)gmail.com
Guest

Posted: Fri Jul 31, 2015 9:51 pm Post subject: grounding mag p lead shield...which side?

Thats why I love this list! Thanks Charlie!



On Friday, July 31, 2015, Charlie England <ceengland7(at)gmail.com (ceengland7(at)gmail.com)> wrote:

 	  Quote: 	
		                     On 7/31/2015 6:01 AM, Bob Verwey wrote:

     

      	  Quote: 	
		                  switch side           or mag side?

       

       

     	
     Suspend normal thought about shields when looking at magnetos.

     

     The shield is the return path to short out the mag when the mag     switch is 'off' (note the quotes). 

     http://www.aeroelectric.com/articles/MagnetoSwitchOptions.pdf

     

     Center conductor to the points in the mag, shield grounded to the     mag case.

     

     At the other end, center conductor to one terminal of your mag     switch, and the shield to the other terminal. When the switch is     *closed* (continuity across the terminals), the mag is *off*. When     the switch is *open* (off, in normal terminology), the mag is *on*.

       	  Quote: 	
		  



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tp://forums.matronics.com

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-- 

Best...Bob Verwey



  [quote][b]

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