---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Thu 07/22/10: 7 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 09:54 AM - Re: Z-32 Question (jonlaury) 2. 10:00 AM - Re: Z-32 Question (jonlaury) 3. 10:43 AM - Re: Redundant Power switching (jonlaury) 4. 11:11 AM - Re: Electrical System Schematic Review (jonlaury) 5. 11:28 AM - Re: Corrected Electrical Schematic for Review (jonlaury) 6. 11:30 AM - Electrical System Schematic Review Rev A (jonlaury) 7. 01:00 PM - Re: Electrical System Schematic Review (user9253) ________________________________ Message 1 _____________________________________ Time: 09:54:32 AM PST US Subject: AeroElectric-List: Re: Z-32 Question From: "jonlaury" Bob, OK, got it. But now that begs the question of why there is a fusible link between the Ebus and Alt Feed Switch in Z-13/8 and not one in Z-32 between the contactor and Ebus? Also, would you comment on my attached schematic (disregard pg 2)? In particular your thoughts on using the GP contactor as a contactor for Alt # 2. Is there a prohibition of having both alternators online simultaneously? Thank you, John Read this topic online here: http://forums.matronics.com/viewtopic.php?p=305962#305962 Attachments: http://forums.matronics.com//files/z13_8q_mine_w_40a_contactor_111.pdf ________________________________ Message 2 _____________________________________ Time: 10:00:37 AM PST US Subject: AeroElectric-List: Re: Z-32 Question From: "jonlaury" Bob, I missed your response to "Corrected Electrical Schematic" so disregard that part of my last post on this subject. Thanks, J Read this topic online here: http://forums.matronics.com/viewtopic.php?p=305963#305963 ________________________________ Message 3 _____________________________________ Time: 10:43:35 AM PST US Subject: AeroElectric-List: Re: Redundant Power switching From: "jonlaury" Joe G, My question was rendered moot by going with two DPST switches, one leg of which powers the EFI ECU and the other, the Injectors, per Dick Tasker's suggestion to eliminate the single point of failure. I was being kind of myopic wondering if a DPST providing dual power sources to a single load would see 1/2 the load on each leg. Thanks, John Read this topic online here: http://forums.matronics.com/viewtopic.php?p=305968#305968 ________________________________ Message 4 _____________________________________ Time: 11:11:48 AM PST US Subject: AeroElectric-List: Re: Electrical System Schematic Review From: "jonlaury" user9253 wrote: > ... > Also, the diode needs to be in series with the contactor coil to prevent reverse polarity damage from the ground power. See Bob's drawing Z-31B. > Joe > http://www.aeroelectric.com/PPS/Adobe_Architecture_Pdfs/Z31K.pdf Joe, I'm doing a separate post of my schematic revisions, titled ...RevA, B, etc. Made the correction re the OVM. Re Diodes Because I'm using a continuous duty contactor with one 8-32 coil post, as drawn, I asked about placement and orientation. Bob N responded " The banded end of the diode connects to the "BAT" terminal of the contactor which in turn faces incoming power from the ground power connector." I thought that my schematic complied with Bob's suggestion??? Is the second diode on the wire to the switch breaker superfluous once the contactor diode is oriented/located properly? Thanks, John Read this topic online here: http://forums.matronics.com/viewtopic.php?p=305977#305977 ________________________________ Message 5 _____________________________________ Time: 11:28:49 AM PST US Subject: AeroElectric-List: Re: Corrected Electrical Schematic for Review From: "jonlaury" nuckolls.bob(at)aeroelect wrote: > At 08:14 PM 7/21/2010, you wrote: > > > > > > > You could do that but the contactor needs to be a 4-terminal > device wired with three diodes like a cross-feed contactor > in Z-14. The way you have it wired now, the contactor may > not be assured a power source for closing it if the alternator > doesn't self-excite. Better that coil power is assured with > the appropriate array of diodes. > > Also, you need to fix the ov protection on this contactor > per remarks offered earlier. > Bob . . . Bob, Got the OVM where it's supposed to go. See post "Electrical Schematic for Review, Rev.A" I'm not sure what you mean by "self excite". The Ebus Alt Feed Switch provides power to the field. If the alternator starts outputting voltage, doesn't the B lead provide power to the coil of the contactor, closing it?. And if the alternator isn't making any power, does it matter if the contactor closes or not?? John Read this topic online here: http://forums.matronics.com/viewtopic.php?p=305981#305981 ________________________________ Message 6 _____________________________________ Time: 11:30:24 AM PST US Subject: AeroElectric-List: Electrical System Schematic Review Rev A From: "jonlaury" Most current revision Read this topic online here: http://forums.matronics.com/viewtopic.php?p=305982#305982 Attachments: http://forums.matronics.com//files/z13_8q_mine_w_40a_contactor_reva_110.pdf ________________________________ Message 7 _____________________________________ Time: 01:00:58 PM PST US Subject: AeroElectric-List: Re: Electrical System Schematic Review From: "user9253" > Is the second diode on the wire to the switch breaker superfluous once the contactor diode is oriented/located properly? John, Your GROUND POWER / ALT 2 contactor circuit is looking good now. As for the diode, the one below the contactor going to the GND PWR 2 amp breaker, it is wired correctly and will protect against reverse polarity from an exterior battery. The other diode on the right side of the contactor does not serve any useful purpose that I can see. It does not hurt anything, except that it is an unnecessary failure point. If this diode was intended as a coil arc suppression diode, it is connected to the wrong contactor terminal. It should have been connected where the O.V. module is now. Not to worry about that, just get rid of that unnecessary diode because the O.V. module guards against voltage spikes. I agree that as long as the battery is not dead and the E-BUS ALT FEED switch is turned on, then the AUX Alternator should work and energize the contactor coil. Joe -------- Joe Gores Read this topic online here: http://forums.matronics.com/viewtopic.php?p=305994#305994 ------------------------------------------------------------------------------------- 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.