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Avionics master switch/relay

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rv7ator

Joined: 21 Dec 2006
Posts: 2

Posted: Sat Jul 21, 2007 7:04 am Post subject: Avionics master switch/relay

I am wanting to use an avionics master switch or  relay with my electrical system. My question is: Do I need to put all of my  avionics on a separate bus then control the power to that bus by the  avionics master?  Also,what if I want just a portion of my avionics on my  endurance bus? I have looked at all of the Z figures and cannot find an  example.

  

 Thanks in advance for your help.

  

 Ed

 RV-7

 About to hang the  engine

   [quote][b]

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aurbo(at)ak.net
Guest

Posted: Sat Jul 21, 2007 7:22 am Post subject: Avionics master switch/relay

Ed,

  

 Go to the archive search engine and type  in avionics master switch. Lots of info. It may change your mind.  

  

 If not do it your way and put in an  avionics master switch and a separate bus for avionics.

  

 If you decide to go with out an avionics  master than just put what you "need" to successfully land after the "dark and  stormy night" episode on the endurance bus and put the rest on your main  bus.

  

 For an example take a look at the Z-11  schematic. Notice the way the main and endurance buses are laid  out.

  

 Mike Ice

 Hanging the motor

 [quote]   ---

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Steve Glasgow

Joined: 10 Jan 2006
Posts: 674

Posted: Sun Jul 22, 2007 2:01 am Post subject: Avionics master switch/relay

Why not make the endurance bus and the avionics bus one and the  same.  On a friends RV7 we are doing this.  He has a 60 A B&C  alternator and a 20 A B&C standby alternator.  The  avionics/endurance bus is fed from the Main Bus through a diode and a   S704-1 B&C relay switching circuit.  Additionally, the  avionics/endurance bus can be fed from the Battery Bus through another S704-1  relay switching circuit.

  

 Schematics available on request.

  

 Steve Glasgow-Cappy

N123SG  RV-8

Cappy's  Toy



   [quote][b]

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_________________
Steve Glasgow-Cappy
Cappy's Toy
RV-8 N123SG

peter(at)sportingaero.com
Guest

Posted: Sun Jul 22, 2007 1:14 pm Post subject: Avionics master switch/relay

Ed,  

   

If you still want to use an avionics master after reading all Bob has written you could try using 2 avionics buses, each energized by a relay both of which are switched by one double pole switch. Put your essential avionics on one bus and provide that with power direct from the battery via an emergency switch and diode. If the emergency switch is a double pole item also it could control power to your essential/endurance, non avionic, bus as well. Please be aware that the parts count has gone up and reliability has probably gone down, and I have not tried this set up.  

   

Yours, Peter  

   

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nuckollsr(at)cox.net
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Posted: Tue Jul 24, 2007 1:47 pm Post subject: Avionics master switch/relay

At 10:07 PM 7/22/2007 +0100, you wrote:



   Or how about wiring per figure on page 4 of



http://aeroelectric.com/articles/avmaster.pdf



   Bob . . .

[quote]Ed,



If you still want to use an avionics master after reading all Bob has 

written you could try using 2 avionics buses, each energized by a relay 

both of which are switched by one double pole switch. Put your essential 

avionics on one bus and provide that with power direct from the battery 

via an emergency switch and diode. If the emergency switch is a double 

pole item also it could control power to your essential/endurance, non 

avionic, bus as well. Please be aware that the parts count has gone up and 

reliability has probably gone down, and I have not tried this set up.



Yours, Peter



--

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