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gmvouga(at)hotmail.com
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 Posted: Mon May 14, 2007 6:29 pm Post subject: Avionics Master |
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All,
I'm working on my panel and I'm trying to decide if I should put an Avionics
Master switch. In my experience with rental planes this was nice to have
since there was one switch to turn everything on or off during engine start
or shutdown.
Is there any reason not to add this feature? I'm planning an E-Bus and Main
Bus configuration similar to the Z-13/8 design.
Thanks
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reichec
Joined: 23 Apr 2007
Posts: 26
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| Posted: Tue May 15, 2007 2:40 am Post subject: Avionics Master |
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Some people will say "Oh but the switch will break!!!" or " what if the
relay fails" So here are two easy solutions...
1. Use two circuit breaker switches rated for 40 amps in parallel. if one
craps out, turn the other on.
2. hook up a heavy rated normally closed relay, so when you have the
avionics "off" you are actually powering the relay open and when you want to
turn the stuff on, you take power off the relay. When you turn the master
on, the avionics will get a little power until the relay powers open. This
is the way Beech has been doing it for a while.... also if your switch
fails, that breaks the power to the relay (wont open up) you can pull the
avionics power breaker to remove power to the relay , thus causing the
contacts to close and put power on the bus.
Some ideas
Charles Reiche
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sales(at)6440autoparts.co
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| Posted: Tue May 15, 2007 7:41 am Post subject: Avionics Master |
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Another solution is to put each main device such as radio
xponder etc on a W31 breaker type switch. Kill 2 birds with one stone, each
needs their own fuse anyway. And if the design was for panel mount klixons
you would not be taking up any extra panel room.
Randy
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Float Flyr
Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland
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| Posted: Tue May 15, 2007 6:45 pm Post subject: Avionics Master |
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It is also nice to be able to shut down avionics as a block in the case of a
short circuit and make troubleshooting a lot easier if all your avionics are
on a dedicated buss.
Noel
[quote] --
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Noel Loveys
Kitfox III-A
Aerocet 1100 Floats |
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