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Use of 700-2-10 switch for Voltage Sense - how to wire?

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nuckolls.bob(at)cox.net
Guest

Posted: Mon May 12, 2008 6:31 pm Post subject: Use of 700-2-10 switch for Voltage Sense - how to wire?

At 11:02 AM 5/12/2008 -0700, you wrote:



 	  Quote: 	
		  



I am building a Z-19 type electrical system and I have a question

about a switch configuration. I was planning to use  a 2-10 / three

position to view voltage on different buses, depending

  on the position:



  1. E Bus voltage

  2. Main Battery Bus voltage

  3. Engine Battery Bus voltage



I have a digital volt meter with simple +/- inputs.



  First, do you think this switch 2-10  will work or should I use 

 something else?



  I've played around with various wire combinations and a 2-10 switch but 

 have come up short (not a short, ha!). I just cannot seem to figure out 

 the right combination that provides the power feed to a single switch 

 position/combination. So that is the crux of my problem, the right wiring 

 for this switch (if possible).  I know that all three PLUS leads from the 

 bus to switch to meter need to be isolated through the switch. I seem to 

 get one source isolated but then another switch position lights up two 

 power leads.



The ground is common across all  buses and batteries.


	


    The 2-10 would work but as others have noted, leaving a

    voltmeter connected to a battery bus for long periods of

    time may present a battery service readiness issue. If you

    use the 2-70 architecture (spring loaded to center) you can

    use the center position to read e-bus (which goes down with

    the master switches). The extremes are used to measure

    batteries and cannot be inadvertently left ON after the

    airplane is shut down.



    A miniature version of the 2-70 is a C&K 7215SYZQ available

    from Digikey at:



  http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail?name=CKN1134-ND



    Wiring for this switch is illustrated at:



http://www.aeroelectric.com/Pictures/Schematics/3-Ch_Voltmeter.pdf



        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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mikefapex

Joined: 05 Jul 2007
Posts: 70
Location: Colorado

Posted: Tue May 13, 2008 6:00 am Post subject: Re: Use of 700-2-10 switch for Voltage Sense - how to wire

Bob,



That was the info I was looking for. Thanks very much, seems like a straightforward solution.



Mike

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mikefapex

Joined: 05 Jul 2007
Posts: 70
Location: Colorado

Posted: Sun May 18, 2008 3:33 pm Post subject: Re: Use of 700-2-10 switch for Voltage Sense - how to wire

I obtained both the Digikey and B&C 2-7 switches. 



When wired as indicated on the diagram the Digikey version worked as expected. However the B&C 2-7 did  not.  The middle position does not show the expected voltage (or any voltage). When I substitute a 2-10 switch it, like the Digikey version, works as expected.



I will play further with the B&C 2-7 but it is either not designed for wiring that way or just a bad switch.



Mike

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nuckolls.bob(at)cox.net
Guest

Posted: Sun May 18, 2008 6:58 pm Post subject: Use of 700-2-10 switch for Voltage Sense - how to wire?

At 04:33 PM 5/18/2008 -0700, you wrote:



 	  Quote: 	
		  



I obtained both the Digikey and B&C 2-7 switches.



When wired as indicated on the diagram the Digikey version worked as 

expected. However the B&C 2-7 did  not.  The middle position does not show 

the expected voltage (or any voltage). When I substitute a 2-10 switch it, 

like the Digikey version, works as expected.



I will play further with the B&C 2-7 but it is either not designed for 

wiring that way or just a bad switch.


	


    You lost me. Did our conversation start out talking

    about the 2-7 functionality?



    A 2-7 is double pole, three position, (ON)-OFF-(ON) device

    where the parens around the 'ON' denotes a spring-loaded

    momentary position.



    The 2-10 is a double pole, three position, PROGRESSIVE

    TRANSFER, ON-ON-ON device that is stable at all three

    positions. No spring loading.



    A few of the ways these two switches can be used

    are illustrated in:



http://aeroelectric.com/Pictures/Schematics/2-Pole_Switch_Options.pdf



    and in Figure 11-14 in the 'Connection.



    The 2-7 cannot substitute for a 2-10. A 2-70 (progressive

    transfer version of a 2-7) can do the same switching

    job as a 2-10 where you WANT the two extreme positions to

    be momentary.



    I don't think B&C stocks the 2-70 so if you got a 2-7

    from them, I would predict mystifying results. The Digikey

    number I gave you was for a 2-70 equivalent in a miniature

    switch by C&K . . . not a 2-10.



    If you've already drilled a hole for a standard size

    2-70, there's a version of the miniature 2-70

    that sports a standard size toggle and mounting hole.

    See:



http://aeroelectric.com/Pictures/Switches/7215TZQE.jpg



    and



http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail?name=CKN1495-ND

    Bob . . .

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mikefapex

Joined: 05 Jul 2007
Posts: 70
Location: Colorado

Posted: Mon May 19, 2008 7:33 am Post subject: Re: Use of 700-2-10 switch for Voltage Sense - how to wire

Bob,



My bad, I mixed up the switch types. I think I will stick with the small Digikey switch and be happy.



Thanks again,



Mike

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