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dfmoeller
Joined: 19 Jun 2006
Posts: 60
Location: Austin, TX
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 Posted: Sat May 05, 2007 4:34 am Post subject: E-Bus Source Switching |
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I am in the midst of some fairly major work on my zodiac and thought this would be a good opportunity to split the power distribution into a main and an e-bus.
Rather than an e-bus SOURCE switch and a large diode as shown in the aero-electric connection, I was thinking about incorporating an AVIONICS-MASTER switch between the main and e-bus, and had the idea that a 2 pole, 3 position switch would allow e-bus OFF, e-bus ON, and e-bus ALT SOURCE positions, while ensuring no back-flow into the main bus from the alt source, thus eliminating that honkin' diode and its voltage drop. All from just one switch!
Any reason anyone can see not to do this?
Doug
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glastar(at)gmx.net
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| Posted: Sat May 05, 2007 4:59 am Post subject: E-Bus Source Switching |
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Hi Dough,
on the fast run 1 major  )
-single point of failure
The difference between an E-bus and an avionics master is that on the
e-bus you have all essential parts for a save ending of your flight in
case your alternator fails, on an avionics bus you have all avionics
equipment (if needed or not for essential requirements). I have the
diode in place and the voltage drop is not a real problem, it's so minor
and only there when anyway your alternator is sourcing the bus so I see
no issue (if you want you can go to more expenses and get a part which
has only 0.1V drop. The good thing about the diode (or if you have bad
avionics (brownout) the bad thing) you have only one switch to get the
cockpit live, so the KISS principle.
br Werner (full electric, no steam gauges and happy living 288hrs with it)
dfmoeller wrote:
| Quote: |
I am in the midst of some fairly major work on my zodiac and thought this would be a good opportunity to split the power distribution into a main and an e-bus.
Rather than an e-bus SOURCE switch and a large diode as shown in the aero-electric connection, I was thinking about incorporating an AVIONICS-MASTER switch between the main and e-bus, and had the idea that a 2 pole, 3 position switch would allow e-bus OFF, e-bus ON, and e-bus ALT SOURCE positions, while ensuring no back-flow into the main bus from the alt source, thus eliminating that honkin' diode and its voltage drop. All from just one switch!
Any reason anyone can see not to do this?
Doug
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=110964#110964
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