Today's Message Index:
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1. 05:33 AM - Re: Re: Exploring a Different Way to Wire Avionics (GTH)
2. 10:46 AM - Re: Looking for help finalysing my Cozy's electrical system (johnbright)
3. 11:27 AM - Re: Exploring a Different Way to Wire Avionics (donjohnston)
Message 1
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| Subject: | Re: Exploring a Different Way to Wire Avionics |
Le 10/07/2020 02:24, donjohnston a crit:
> The "innards" are just traces on a board. I can't imagine having to troubleshoot
it, but if you did, it would be pretty easy.
I meant, how do you troubleshoot your installation should anything go
wrong. You seem to imply they are providing their 'box schematics ?
>
> In the event you have something outside of the typical device, you just modify
the configuration plug.
OK, you just make another plug/connector/ bundle.
>
>
> Is it really DIY if you buy a radio as opposed to building one yourself?
> Is it really DIY if you buy an engine as opposed to building one yourself?
> I could go on...
No problem.
I was just thinking of choosing one's items and *fabricating* something,
e.g. the bundles, plugs, connectors, as opposed to buying everything
premade.
> Personally, I like being able to choose which tasks of the build I do myself
and which ones I purchase off the shelf.
You are certainly entitled to do that, and nobody would deny.
My questions were just to ascertain whether there really was a
"different way to wire avionics" or just another premade
bundle/interconnect box etc.
--
Best regards,
Gilles
http://contrails.free.fr
http://lapierre.skunkworks.free.fr
Message 2
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| Subject: | Re: Looking for help finalysing my Cozy's electrical |
system
Hi Eric,
My thoughts:
The EFII harness has an un-necessary SPOF; powering all four injectors thru one
wire. You do not have to accept this SPOF. I would assume the fusible links built
into the harness are capable of opening the injector breakers. Power the
four injectors thru four fuses, a 5A fuse is good for one injector.
Do the EFII supplied firewall connectors melt in a fire?
Does it make sense to have main reg v sense on VPX? (I haven't studied VPx)
It's confusing to show injectors grounded within injector power harness.
The voltage regulator "bus" feed should have a 5A CB versus a fuse because of nuisnace
trip potential of crowbar.
Replace circuit breakers with MIDIs or fuselink wire except voltage regulator "bus"
feed needs to be a CB because of crowbar nuisance trips.
Design your electrical system for a simple, no questions asked, engine out procedure.
You will forget details of your architechture and your intelligence will
fall 90% when the engine quits.
Consider switching to Z-101.
--------
John Bright, RV-6A, at FWF, O-360
Z-101 single batt dual alt SDS EM-5-F.
john_s_bright@yahoo.com, Newport News, Va
https://drive.google.com/drive/folders/1u6GeZo6pmBWsKykLNVQMvu4o1VEVyP4K
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=497237#497237
Message 3
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| Subject: | Re: Exploring a Different Way to Wire Avionics |
> I meant, how do you troubleshoot your installation should anything go
> wrong. You seem to imply they are providing their 'box schematics ?
Yes. You receive a wiring diagram which shows the connections.
> My questions were just to ascertain whether there really was a
> "different way to wire avionics" or just another premade
> bundle/interconnect box etc.
My previous airplane and and every other one I've looked had the avionics wired
the same way. Cables connecting a device to one or more other devices. The
audio panel seemed to have the most connections to other devices. That's one
way.
In my current aircraft, there is only one physical cable between the devices (other
that the audio panel and EFIS's which have two) and the hub. In my opinion,
it's a different way of wiring avionics.
Which means if I want to change the type of com radio, all I need to do is build
a new cable that connects the radio to the hub. I don't have to mess with the
connections to the audio panel or the EFIS's. If the new radio is significantly
different, I may need to modify the configuration plug on the hub. But for
something like a com or nav radio, that's pretty unlikely.
Now in the interest of full disclosure, the hub has no power distribution. So
every cable has a pigtail with two wires for power. So my Com1 cable has a red
and black wire that connects to power and ground. Same for every other device
cable. Some (like my EFIS) have three separate power leads. My GPS has additional
leads for things like my ELT.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=497238#497238
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