---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Thu 12/29/11: 4 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 06:46 AM - Re: Main Battery Contactor (Robert L. Nuckolls, III) 2. 07:31 AM - Re: Main Battery Contactor (Robert L. Nuckolls, III) 3. 06:37 PM - Re: Re: First Engine Start Problem (Dan Billingsley) 4. 07:50 PM - Re: First Engine Start Problem (user9253) ________________________________ Message 1 _____________________________________ Time: 06:46:09 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Main Battery Contactor At 08:32 PM 12/28/2011, you wrote: > >Hey Bob... > >I'm looking at Z-12! Can you tell me the difference between the >Battery Contactor(no number) >on Z-12 and B&C's - S701-1? Are they the same... and Can the >S701-1 be used for the main >battery contactor? The S701-1 and variants are offered as continuous duty contactors suitable for use as a battery master, cross-feed, or other service that does not require SWITCHING of heavy loads. I.e, the contactor will provide a useful service life CARRYING large loads (100+ amps) after the contacts are closed and stable. S702-1 style contactors are intermittent duty devices quite unsuited to tasks outlined above but optimized to manage the large switching loads associated with starter and landing gear pump motors. Bob . . . ________________________________ Message 2 _____________________________________ Time: 07:31:30 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Main Battery Contactor At 08:32 PM 12/28/2011, you wrote: > >Hey Bob... > >I'm looking at Z-12! Can you tell me the difference between the >Battery Contactor(no number) >on Z-12 and B&C's - S701-1? Are they the same... and Can the >S701-1 be used for the main >battery contactor? Why z-12 and not Z-13/8? What kind of airplane are you building and how do you intend to use it? Bob . . . ________________________________ Message 3 _____________________________________ Time: 06:37:17 PM PST US From: Dan Billingsley Subject: Re: AeroElectric-List: Re: First Engine Start Problem Just got back from the airport and found the following:=0A1.I took the amme ter reading across the Alternate switch (with the Master switch off). I was reading at 5.2 A with everything on and that was without keying the mic fo r transmission. I assume that would bump it up even more (didn't get a chan ce to try that).-=0A2. The Diode between the two buses WAS backwards. I c hanged it and now my panel lights up when the Master switch is on. Would th is have had any bearing on why my fuseable link burned or do you think I ne ed to move some things to the Main bus? The components I have on the E-bus are as follows:=0ADynon D100, Garmin 396, EIS (engine monitor), SL40 radio, Transponder, LED Becon and tail position light, Intercom, HZ Stab trim ser vo. I don't have wing tip position/Nav lights yet but can probably put them on the main bus along with the other lights when I get them. The other thi ng I was toying with is moving the D-100 and the 396 over as they both have back-up batteries Thoughts or suggestions welcome.=0AThanks,=0ADan=0A=0A =0A=0A>________________________________=0A> From: "Robert L. Nuckolls, III" =0A>To: aeroelectric-list@matronics.com =0A >Sent: Wednesday, December 28, 2011 6:54 PM=0A>Subject: Re: AeroElectric-Li st: Re: First Engine Start Problem=0A> =0A>--> AeroElectric-List message po sted by: "Robert L. Nuckolls, III" =0A>=0A>A t 07:39 PM 12/28/2011, you wrote:=0A>> Bob and Joe, thank you for pointing out both over loading ( I went back and read note 12) and the fact that the E-bus should be working with the Alternate switch off. To tell the truth, I have not tried it that way (w/just the Master on). If it does not work I do see that would mean the diode between the two buses is in backwards. I d id check the diode position on the Batt Contactor and it IS installed the r ight way. I now have at the very least, some changing of circuits over to t he Main bus. Will report back on findings after tomorrow.=0A>=0A>- Blowi ng a fusible link is a rather non-trivial=0A>- event. 22AWG wire is capa ble of considerable=0A>- more current than the legacy rating in wire=0A> - bundles of 5A would suggest.=0A>=0A>- It would be interesting to ge t a real current=0A>- measurement of all your goodies before you=0A>- start moving things. Clip an ammeter across=0A>- the alternate feed swi tch while the master=0A>- switch is off.=0A>=0A>=0A>- Bob . . . =0A> ================0A>=0A>=0A>=0A>=0A>=0A> ________________________________ Message 4 _____________________________________ Time: 07:50:04 PM PST US Subject: AeroElectric-List: Re: First Engine Start Problem From: "user9253" The diode being backwards was the reason the fusible link burned open. Part of the starter current was going through the E-Bus circuit. There is a saying that electricity takes the path of least resistance. Even though there is a big fat wire going from the battery to the starter, that path is not the least resistance for ALL of the current. Some of the current will find it easier to take parallel paths. An analogy is highway traffic. Most cars will take the multi-lane expressway. But when traffic is very heavy and slows down, some cars will take side streets. For them it is the path of least resistance. Your lighting circuit could be moved to the main bus. The E-Bus should handle 5 amps OK. The additional 2 amps while transmitting is of short duration and should not burn open the fusible link. I will not be offended if Bob or anyone corrects me. Joe -------- Joe Gores Read this topic online here: http://forums.matronics.com/viewtopic.php?p=361963#361963 ------------------------------------------------------------------------------------- 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.