Today's Message Index:
----------------------
1. 04:23 AM - Re: B and C Starter relay (Ralph E. Capen)
2. 08:41 AM - Z13 / 8 Revisions - I've Been Gone (Valovich, Paul)
3. 11:17 AM - Re: B and C Starter relay (Robert L. Nuckolls, III)
4. 11:43 AM - Re: B and C Starter relay (Ralph E. Capen)
5. 03:56 PM - Re: Z13 / 8 Revisions - I've Been Gone (Robert L. Nuckolls, III)
Message 1
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| Subject: | Re: B and C Starter relay |
It does have the "suppression" marks - good #1.
The switch has a real good push and release (momentary) action - I don't
have the number here - but I am happy with the action.
----- Original Message -----
From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
Sent: Monday, March 02, 2009 6:29 PM
Subject: Re: AeroElectric-List: B and C Starter relay
> <nuckolls.bob@aeroelectric.com>
>
> At 10:35 AM 3/2/2009, you wrote:
>><recapen@earthlink.net>
>>
>>Does anyone know how much current the B & C S702-1 starter relay draws at
>>the "S" terminal when active?
>>
>>I know that the two large terminals will carry what I need - I'm trying to
>>determine if the 6A @ 12VDC capable switch that I would like to use is
>>sufficient or whether I need a relay to drive the starter relay.
>
> That switch will be fine. The contactor draws a lot more
> that a continuous duty battery contactor (typically 4A
> versus 1A) but the REAL concern for switch life has
> to do with the catch diode being installed on the coil.
> If B&C is buying the same part I used to sell as S702-1,
> the diode is built in. If you look on the bottom mounting
> plate, you should see some words speaking to "suppression"
> stamped in the metal.
>
> What kind of switch are you talking about? Does it have
> a nice "snap" action?
>
>
> Bob . . .
>
> ----------------------------------------)
> ( . . . a long habit of not thinking )
> ( a thing wrong, gives it a superficial )
> ( appearance of being right . . . )
> ( )
> ( -Thomas Paine 1776- )
> ----------------------------------------
>
>
>
Message 2
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| Subject: | Z13 / 8 Revisions - I've Been Gone |
Bob,
I wired my yet-to-fly RV-8A according to previous Z 13 architectures. Still
have some final tweaking to do - mainly involving lighting. For the past 9
months or so I have been doing other "stuff" on the airplane and have not
paid much attention to 'tron postings. However, I did download the latest Z
diagrams and a quick comparison shows a relay between the battery and E-bu
ses vice just a switch.
I'm sure there have been discussions and postings regarding this change, bu
t I can't seem to find them. Can you (again) provide a short summary regard
ing the logic for this change - and I guess more importantly, the dangers /
disadvantages of maintaining the previous wiring scheme? I was pretty happ
y with the previous E-bus logic. Have you discovered some sneak circuit tha
t will turn my wiring into a smoking mass of non-functionality?
Changing things after the fact may or may not be easy - it's just not somet
hing that mentally appeals to me right now. Canopy / cowl wars have been gi
ving me as much fun as I can stand.
Paul Valovich
N192NM Reserved (again)
Message 3
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| Subject: | Re: B and C Starter relay |
At 06:14 AM 3/3/2009, you wrote:
><recapen@earthlink.net>
>
>It does have the "suppression" marks - good #1.
>The switch has a real good push and release (momentary) action - I
>don't have the number here - but I am happy with the action.
You're good to go . . .
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
----------------------------------------
Message 4
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| Subject: | Re: B and C Starter relay |
Thanks!
-----Original Message-----
>From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
>Sent: Mar 3, 2009 2:15 PM
>To: aeroelectric-list@matronics.com
>Subject: Re: AeroElectric-List: B and C Starter relay
>
>
>At 06:14 AM 3/3/2009, you wrote:
>><recapen@earthlink.net>
>>
>>It does have the "suppression" marks - good #1.
>>The switch has a real good push and release (momentary) action - I
>>don't have the number here - but I am happy with the action.
>
> You're good to go . . .
>
>
> Bob . . .
>
> ----------------------------------------)
> ( . . . a long habit of not thinking )
> ( a thing wrong, gives it a superficial )
> ( appearance of being right . . . )
> ( )
> ( -Thomas Paine 1776- )
> ----------------------------------------
>
>
Message 5
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| Subject: | Re: Z13 / 8 Revisions - I've Been Gone |
At 10:39 AM 3/3/2009, you wrote:
>Bob,
>I wired my yet-to-fly RV-8A according to
>previous Z 13 architectures. Still have some
>final tweaking to do mainly involving
>lighting. For the past 9 months or so I have
>been doing other stuff on the airplane and
>have not paid much attention to tron postings.
>However, I did download the latest Z diagrams
>and a quick comparison shows a relay between the
>battery and E-buses vice just a switch.
The original incarnation of the e-bus had a design
goal of using up fuel aboard in a battery only
scenario. When major flight instruments were still
vacuum powered, the notion of getting your electro-
whizzy loads down to 3 amps or so wasn't an
unreasonable thing to contemplate.
The 3A e-bus was easily powered up through a long
feeder from the always hot battery bus through
a 5A or so fuse. When Z-13/8 came along, the e-bus
loads of 8A or more could be supported . . . even
say 10-11 amps by using the alternator + battery
combined.
This pushed the long, always hot feeder to current
levels that made a flying fuzz uncomfortable . . .
traditionally, we've tried to keep always hot long
wires protected at 5A or below.
Hence the addition of Z-32, Heavy-Duty E-Bus Feed
which has been incorporated into the present version
of Z-13/8 as well. If your ebus loads are under 5A
or if you choose not to embrace the traditional
design goals, then you can leave the relay out and
simply wire and fuse your E-bus alternate feed wire
as necessary to support whatever loads you've
settled on.
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
----------------------------------------
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