---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Tue 03/03/09: 5 ---------------------------------------------------------- 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 _____________________________________ Time: 04:23:21 AM PST US From: "Ralph E. Capen" Subject: Re: AeroElectric-List: 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" Sent: Monday, March 02, 2009 6:29 PM Subject: Re: AeroElectric-List: B and C Starter relay > > > At 10:35 AM 3/2/2009, you wrote: >> >> >>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 _____________________________________ Time: 08:41:48 AM PST US From: "Valovich, Paul" Subject: AeroElectric-List: 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 _____________________________________ Time: 11:17:35 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: B and C Starter relay At 06:14 AM 3/3/2009, you wrote: > > >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 _____________________________________ Time: 11:43:46 AM PST US From: "Ralph E. Capen" Subject: Re: AeroElectric-List: B and C Starter relay Thanks! -----Original Message----- >From: "Robert L. Nuckolls, III" >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: >> >> >>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 _____________________________________ Time: 03:56:30 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: 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- ) ---------------------------------------- ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message aeroelectric-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/AeroElectric-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/aeroelectric-list Browse Digests http://www.matronics.com/digest/aeroelectric-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.