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JOHN TIPTON
Joined: 17 Sep 2006
Posts: 239
Location: Torquay - England
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 Posted: Thu Jun 04, 2015 12:44 am Post subject: Essential Bus feed |
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Hi Guys
Am I missing something: Why can't the feed to the Essential Bus be a simple changeover switch (1-3) to select which source you require the power to come from, thus eliminating the diode
Regards: John
[quote][b]
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user9253
Joined: 28 Mar 2008
Posts: 1935
Location: Riley TWP Michigan
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| Posted: Thu Jun 04, 2015 5:24 am Post subject: Re: Essential Bus feed |
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| Quote: | | Why can't the feed to the Essential Bus be a simple changeover switch (1-3) to select which source you require the power to come from, thus eliminating the diode |
That switch would be a single point of failure. When it fails, essential equipment is lost. Having both a diode and a switch provides two current paths.
Joe
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Tim Olson
Joined: 25 Jan 2007
Posts: 2879
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| Posted: Thu Jun 04, 2015 6:07 am Post subject: Essential Bus feed |
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Also, if it's on a switch, unless it's a progressive switch,
you will drop power to the bus when it is in between positions,
so everything will reboot that it powers. YOu CAN use a switch
or relay depending on the load, but you would still want the
diode. That way it gets power whenever there is source
power. The difference would be that when the switch is
in the proper position you wouldn't have any diode drop.
But it adds more complexity.
Tim
On 6/4/2015 8:24 AM, user9253 wrote:
| Quote: |
> Why can't the feed to the Essential Bus be a simple changeover switch (1-3) to select which source you require the power to come from, thus eliminating the diode
That switch would be a single point of failure. When it fails, essential equipment is lost. Having both a diode and a switch provides two current paths.
Joe
--------
Joe Gores
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kjashton(at)vnet.net
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| Posted: Thu Jun 04, 2015 7:30 am Post subject: Essential Bus feed |
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In my setup, I took a multi-fuse Bussman fuse block (pic) and cut the interior center conductor to create a main bus and essential bus. I silver-soldered a copper tab on the smaller essential bus side of the center conductor (left side in the pic) to wire battery power to the essential bus through an “essential bus” switch which is normally off. The main bus provides power to the essential side through a diode and all is powered. In an emergency, I can turn off the master switch and power the essential bus via the essential bus switch. Sorry, don’t have a better pic but you get the idea, I hope-Kent | Quote: | On Jun 4, 2015, at 9:24 AM, user9253 <fransew(at)gmail.com (fransew(at)gmail.com)> wrote:--> AeroElectric-List message posted by: "user9253" <fransew(at)gmail.com (fransew(at)gmail.com)> | Quote: | | Why can't the feed to the Essential Bus be a simple changeover switch (1-3) to select which source you require the power to come from, thus eliminating the diode |
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