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

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mikefapex

Joined: 05 Jul 2007
Posts: 70
Location: Colorado

Posted: Mon May 12, 2008 10:02 am Post subject: Use of 700-2-10 switch for Voltage Sense - how to wire?

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.



 2-10 switch layout



   KEYWAY UP



 3    6

 2    5

 1    4



 Thanks for any wiring suggestions,

Mike

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dennis.glaeser(at)eds.com
Guest

Posted: Mon May 12, 2008 12:14 pm Post subject: Use of 700-2-10 switch for Voltage Sense - how to wire?

Mike,



The 2-10 is an ON-ON-ON switch, which is useful as a Bat/Alt master, but

not suited for your task because it provides for multiple simultaneous

connections, and you only want one at a time.



Z-19 shows how to connect a 1-7 switch to check the voltage of each of

the batteries - any reason not to do it that way?



However you do it, you need a way to leave the voltmeter disconnected,

or else it is a constant drain on the battery.



Dennis Glaeser

RV-7A Egg H6 Subaru - flying (Phase 1)



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

------

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.



 2-10 switch layout



   KEYWAY UP



 3    6

 2    5

 1    4



 Thanks for any wiring suggestions,

Mike

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mikefapex

Joined: 05 Jul 2007
Posts: 70
Location: Colorado

Posted: Mon May 12, 2008 2:36 pm Post subject: Re: Use of 700-2-10 switch for Voltage Sense - how to wire?

>>Z-19 shows how to connect a 1-7 switch to check the voltage of each of

the batteries - any reason not to do it that way?<<



Yep, I see the 1-7 switch in the Z-19 but it only connected to the two battery buses, main and engine. I also wanted to also get a voltage reading on the EBus. The EBus would have no voltage on it unless the master switch is on. 



I think I have that right.



Mike

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user9253

Joined: 28 Mar 2008
Posts: 1925
Location: Riley TWP Michigan

Posted: Tue May 13, 2008 7:11 am Post subject: Use of 700-2-10 switch for Voltage Sense - how to wire?

Mike,

  

 You need a triple throw switch, either single pole or double pole, commonly  known as SP3T or DP3T.  You can buy them at electronic supply  companies such as Digikey or Mouser or Allied.  Parenthesis ( ) in the  description indicates a momentary position.  Avoid those unless you want  that feature.  You have to hold the switch in that position and when you  let go, it moves to the previous position.  

  

 http://www.mouser.com/search/Default.aspx  has several triple-throw switches to choose from:

 SP3T $14.08 part number: 506-MTG206PA   gold contacts

 SP3T  $9.43 part number: 506-MTA206PA    gold  contacts

 SP3T  $7.50 part number: 633-M202401-RO  silver contacts

 SP3T  $8.50 part number: 633-M202402-RO  silver contacts

 SP3T  $9.70 part number: 633-M202404-RO  silver contacts

 DP3T $14.90 part number: 633M204401-RO  silver contacts

  

 You can look at a catalog page here: http://www.mouser.com/catalog/634/1582.pdf

 Gold contacts have less resistance and will not corrode but they can NOT  handle very much current.  But they should be good for measuring  voltage.  Silver contacts can handle more current.  The double pole  switch is more versatile and can be used for other applications such as in place  of the 2-10 switch in the Z drawings (if external jumpers are connected  properly).  You could wire the DP3T contacts in parallel and thus cut the  resistance in half and make the switch more reliable.  If one half of the  DP3T switch develops high resistance, the other half will carry the current and  you would not see a problem.

  

 The reason that the 2-10 switch would not work for you is that it has  internal jumpers connecting some of the contacts.

  

 Joe



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