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2-10 Switch

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sonex76(at)velocity.net
Guest

Posted: Sat Jan 06, 2007 7:44 pm Post subject: 2-10 Switch

Hello,

  

 I am wiring my aircraft per drawing Z-20 for a  Jabiru engine

 and am having a hard time wrapping my mind  around

 the wiring of the 2-10 switch. The book says this  switch function

 is ON-ON-ON. I want the bottom position to have  Master OFF;

 middle position Master ON and the top position to  be Alternator ON.

 I am using the OV disconnect relay system, a  starter solenoid and

 a battery solenoid.

 Would someone mind try and explain this switch  wiring to me

 based on the Z-20 drawing.. Please!!

  

 Thanks in advance..

  

 Dick Fisher

 sonex76(at)velocity.net (sonex76(at)velocity.net)

  

  

   [quote][b]

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nuckollsr(at)cox.net
Guest

Posted: Sat Jan 06, 2007 10:51 pm Post subject: 2-10 Switch

At 10:43 PM 1/6/2007 -0500, you wrote:



 	  Quote: 	
		  Hello,



I am wiring my aircraft per drawing Z-20 for a Jabiru engine

and am having a hard time wrapping my mind around

the wiring of the 2-10 switch. The book says this switch function

is ON-ON-ON. I want the bottom position to have Master OFF;

middle position Master ON and the top position to be Alternator ON.

I am using the OV disconnect relay system, a starter solenoid and

a battery solenoid.

Would someone mind try and explain this switch wiring to me

based on the Z-20 drawing.. Please!!


	


   This is explained in detail in Chapter 11 of the 'Connection.

   There is also some information on the 2-10 switch operation

   and terminal numbering conventions in Appendix Z figure

   at the bottom of Page Z-9 and Note 15 on page Z-10.



   If you study the wiring of the DC Power Master switch

   in Z-20 (or any other z-figures) you'll see that when

   the switch is in full down position (as drawn) there is

   no pathway for either the battery or alternator . . . I.e.

   the system is OFF. Now, the switch is designated as

   an ON-ON-ON functionality because there are some connections

   made through the switch in any of its three positions.



   As wired, we do not connect to terminals 3 and 6 which

   provide conduction pathway in the lower position of the handle.

   With nothing connected to 3 and 6, then the lowest position

   of the handle produces a system OFF condition.



   In the mid position, terminals 1 and 2 are connected

   which closes the battery circuit . . . but terminals 5 and

   6 are still connected on the other side of the switch leaving

   the alternator OFF. Moving the switch one more step leaves

   terminals 1 and 2 connected (battery still on) and connects

   terminals 4 and 5 are now connected which adds alternator

   operation.



   Bob . . .



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

      < What is so wonderful about scientific truth...is that >

      < the authority which determines whether there can be   >

      < debate or not does not reside in some fraternity of   >

      < scientists; nor is it divine. The authority rests     >

      < with experiment.                                      >

      <                            --Lawrence M. Krauss       >

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

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sonex76(at)velocity.net
Guest

Posted: Sun Jan 07, 2007 6:13 am Post subject: 2-10 Switch

Bob,



Thank you very much for the clear and concise answer

to my questions on the 2-10 switch. I am now able to

understand the functionality as depicted in your drawing.



Dick Fisher

sonex76(at)velocity.net

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