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Pmag diode

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eschlanser

Joined: 08 Apr 2010
Posts: 60

Posted: Sun Oct 20, 2019 1:17 pm Post subject: Pmag diode

What’s a good way to attach a diode to the Pmag connector? The diode has small solid wires that go to screw down sockets #1 and 6 that also get one 18-20 ga stranded wire in each socket .

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nuckolls.bob(at)aeroelect
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Posted: Sun Oct 20, 2019 2:54 pm Post subject: Pmag diode

At 04:17 PM 10/20/2019, you wrote:

  	  Quote: 	
		  --> AeroElectric-List message posted by: "eschlanser" <eschlanser(at)yahoo.com>



 What’s a good way to attach a diode to the Pmag connector? The diode has small solid wires that go to screw down sockets #1 and 6 that also get one 18-20 ga stranded wire in each socket .

 	


  Does your tach REQUIRE this diode?

  



 

 

   Bob . . .

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user9253

Joined: 28 Mar 2008
Posts: 1927
Location: Riley TWP Michigan

Posted: Mon Oct 21, 2019 5:51 am Post subject: Re: Pmag diode

A dab of E6000 between the diode and other wires will prevent vibration.

Another option is to mount the diode at the tach end of wire number 6.

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_________________
Joe Gores

nuckolls.bob(at)aeroelect
Guest

Posted: Tue Oct 22, 2019 7:16 am Post subject: Pmag diode

At 08:51 AM 10/21/2019, you wrote:

  	  Quote: 	
		  --> AeroElectric-List message posted by: "user9253" <fransew(at)gmail.com>



 A dab of E6000 between the diode and other wires will prevent vibration. 	


   I think 'the rub' comes from placing two wires

   of differing qualities under the same screw-n-mash

   terminal. The smaller wire may not be adequately

   supported.



  	  Quote: 	
		  Another option is to mount the diode at the tach end of wire number 6. 	


   Or in-line with a technique like this:



 [img]cid:.0[/img]



   But more importantly, that diode (actually a

   zener) may not be necessary.



   Quoting from EmagAir's installation data



 [img]cid:.1[/img]



  Adding the suggested diode depends on

  the tachometer being incapable of working with

  the stock, 12v tach signal emitted by

  the eMag.



  Adding the diode clamps the 12v signal down

  to 5v for such cases. Do the Tachometer

  instructions specifically state that the

  input signal cannot exceed 5V?



 



 



 

   Bob . . .

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eschlanser

Joined: 08 Apr 2010
Posts: 60

Posted: Wed Oct 23, 2019 6:45 am Post subject: Pmag and GRT EIS connections was Re: Pmag diode

Bob and all, 



After reading the manual on the GRT EIS I conclude that the tach signal should be 12 volts as you surmised. Should have read that first, but then I wouldn’t have seen the clever way you installed a diode in-line. That was worth the post. Never in a million years would I have come up with that on my own. 



The clip from Emagair that you posted points to other issues and the reason for a separate thread. And that is how to configure and connect the EIS and the Pmag for the tach signal. Because the EIS looks for one tach signal per revolution and the Pmag generates two tach signals per revolution, one system’s configuration will need to be changed. They are both reconfigurable but I don’t know which would be better/easier. 



Also confusing is that Pmags note #1 says to “collect the tach signal from only one Pmag unless your system has provision for two separate inputs.” The GRT EIS has only one tach input but two magnetos can be connected to it. Where do you hook up a second Pmag to a GRT EIS if the instructions to connect are in conflict? 



If magneto #1 is working the EIS will read that signal but if magneto #1 is disabled (as during a mag check), the EIS will read the tach signal of magneto #2. Pmag note #2 states that a disbabled Pmag will still generate a tach signal so you won’t lose tach during a mag check. Huh? If a disabled Pmag is generating a signal, how do you not “see” it? What am I missing? 



Thanks, 

Eric Schlanser 

Tailwind W-10 with dual Pmags

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eschlanser

Joined: 08 Apr 2010
Posts: 60

Posted: Wed Oct 23, 2019 10:22 am Post subject: Pmag and GRT EIS connections was Re: Pmag diode

 	  Quote: 	
		   The GRT EIS has only one tach input but two magnetos can be connected to it. 

	


 Correction to above: The GRT EIS does have two tachometer connections.



 	  Quote: 	
		     Where do you hook up a second Pmag to a GRT EIS if the instructions to connect are in conflict? 	




I guess I’ll need to get help from GRT and Emagair to understand how the connections are to be used since each Pmag will be generating a signal even when disabled.



Eric S.

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nuckolls.bob(at)aeroelect
Guest

Posted: Wed Oct 23, 2019 4:22 pm Post subject: Pmag diode

At 01:22 PM 10/23/2019, you wrote:

  	  Quote: 	
		  --> AeroElectric-List message posted by: "eschlanser" <eschlanser(at)yahoo.com>

 >  The GRT EIS has only one tach input but two magnetos can be connected to it. 

 > 

  Correction to above: The GRT EIS does have two tachometer connections.

 >    Where do you hook up a second Pmag to a GRT EIS if the instructions to connect are in conflict? 

 I guess I’ll need to get help from GRT and Emagair to understand how the connections are to be used since each Pmag will be generating a signal even when disabled.

 Eric S. 	

  Just hook up one tach signal. Probability of

  loosing that signal is exceedingly low and

  even if you did, it's no big deal. Don't mess

  the throttle until airport in sight then reduce

  power for decent. A tach is about the lowest

  priority flight management instrument on the

  panel. Broke a tach shaft out in New Mexico

  on a trip. I knew that I could never over-speed

  the engine in EITHER climb OR cruise at altitude.

  So for all practical purposes, the flight from

  t/o to approach descent could be made at full

  throttle all the way. Brought the airplane home

  for repairs in OUR shop.

  The eMag ignition outputs a tach signal even

  if in IGN OFF condition . . . I'd just hook

  up one ign to the tach and call it good.

  I've designed a couple of electronic tach

  pickoffs for upgrading Beech products to electronic

  displays . . . nobody ever worried about the

  'single source' driving a 'single instrument'.

   Bob . . .

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