---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Sat 04/04/20: 5 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 05:31 AM - Re: New role for the E-Bus? (wsimpso1) 2. 05:32 AM - Re: New role for the E-Bus? (wsimpso1) 3. 08:13 AM - Re: New role for the E-Bus? (Dan Fritz) 4. 08:18 AM - Re: Dan's architecture question (Dan Fritz) 5. 09:14 AM - Re: Z11 "Generic Electrical system" with Dual Electron (johnbright) ________________________________ Message 1 _____________________________________ Time: 05:31:25 AM PST US Subject: AeroElectric-List: Re: New role for the E-Bus? From: "wsimpso1" nuckolls.bob(at)aeroelect wrote: > > > If the List is willing, I'd like to continue > to refine this configuration with an eye > to retiring Z12 and probably Z14 as well. > > Bob . . . Bob, I would rather you not "retire" Z14. I like it and am planning on using it in my bird - wiring has commenced. My bird is single engine with EFII, glass panel, IFR, night, whole continent capability. Two batteries, two masters, cross-feed, and very low probability of finding myself dark. I am rather attached to that scheme. Even if it progresses no more because you have a single battery scheme that looks more reliable, I would like to see it remain on-line, perhaps with the caution that another scheme now scores better on FMEA. Bill Simpson Read this topic online here: http://forums.matronics.com/viewtopic.php?p=495601#495601 ________________________________ Message 2 _____________________________________ Time: 05:32:12 AM PST US Subject: AeroElectric-List: Re: New role for the E-Bus? From: "wsimpso1" nuckolls.bob(at)aeroelect wrote: > > > If the List is willing, I'd like to continue > to refine this configuration with an eye > to retiring Z12 and probably Z14 as well. > > Bob . . . Bob, I would rather you not "retire" Z14. I like it and am planning on using it in my bird - wiring has commenced. My bird is single engine with EFII, glass panel, IFR, night, whole continent capability. Two batteries, two masters, cross-feed, and very low probability of finding myself dark. I am rather attached to that scheme. Even if it progresses no more because you have a single battery scheme that looks more reliable, I would like to see it remain on-line, perhaps with the caution that another scheme now scores better on FMEA. Bill Simpson Read this topic online here: http://forums.matronics.com/viewtopic.php?p=495600#495600 ________________________________ Message 3 _____________________________________ Time: 08:13:40 AM PST US Subject: AeroElectric-List: Re: New role for the E-Bus? From: "Dan Fritz" Bob, I've resumed my build after a 10-year layoff and had installed the 13/8 architecture. Turns our the engine I bought to hand on the firewall already had a B&C 20 Amp alternator hanging on the accessory case. So I've opted to leave it there but keep the 13/8 architecture. I like the Z99 architecture because I can adopt it with very little change to what I've already installed. Dan Read this topic online here: http://forums.matronics.com/viewtopic.php?p=495603#495603 ________________________________ Message 4 _____________________________________ Time: 08:18:40 AM PST US Subject: AeroElectric-List: Re: Dan's architecture question From: "Dan Fritz" My build is a Velocity which planned for night and IFR flights. Load analysis shows Z13/8 would work fine, just happened to have a 20 Amp alternator already hanging on the engine... Read this topic online here: http://forums.matronics.com/viewtopic.php?p=495604#495604 ________________________________ Message 5 _____________________________________ Time: 09:14:52 AM PST US Subject: AeroElectric-List: Re: Z11 "Generic Electrical system" with Dual Electron From: "johnbright" ceengland7(at)gmail.com wrote: > ...I've already set up an ATC fuse block with individual fuses for each injector and ignition coil, but I'm tempted to replace those fuses with fusible links. I might be wrong, but it's easy to see the links as even more reliable than ATC fuses, especially on that type of appliance that has a repetitive very sharp current spike, rather than a relatively continuous load. > > Charlie It seems to me that fuses are OK. My thoughts: ======================== Injectors: For example, a popular OBAM EFI/I system uses 14.5 ohm "saturation" (as opposed to peak-hold which are to my knowledge used in single-point systems) injectors. Steady-state current is 1 amp per injector at 14.5 V. The system manufacturer recommends 5 A fuses, one per injector. Repetitive: Yes, once per crank revolution I guess. Current spike above continuous on level: No. Current rise very sharp: Not compared to a resistive load. Inductor back EMF causes current to rise more slowly than a that of a resistive load. Google found a typical plot at picoauto.com, attached, of saturation injector voltage and current. The plot even seems to be for 14.5 ohm injectors given the voltage and current levels shown. Note it takes a little over 2 mS for the current to reach saturation level. BTW the dip in current rise at 1.3 mS is when the solenoid valve armature moves creating back EMF in addition to what comes from the increasing magnetic field of the stator. Another BTW, the voltage plot shows the flyback voltage created when the inductor is de-energized; this is diode clamped, at 82 V in this case, to prevent damaging the drive transistor; the higher the flyback is allowed to go, the faster the injector will close. ======================================== Coilpacks: picoauto.com also has voltage and current waveforms, attached, for a typical distributorless dual driver wasted spark coilpack. Such a coilpack would be used on a four cylinder Lycoming. This plot shows the same phenomenon of current rise slower than that of a resistive load. A Lycoming four cylinder at 2,700 RPM has 11 mS between ignition events so if this example coilpack represents the ones used on Lycomings, there would be no overlap of currents requested of the two coils. The same popular OBAM EFI/I system supplier says each of their coilpacks draw "just over 1 amp in cruise at 2,400 rpm". and they recommend a 10 A fuse for each coilpack. ======================================= -------- John Bright, RV-6A, at FWF, O-360 Single batt dual alt SDS EM-5-F. john_s_bright@yahoo.com, Newport News, Va Read this topic online here: http://forums.matronics.com/viewtopic.php?p=495605#495605 Attachments: http://forums.matronics.com//files/erase_873.png http://forums.matronics.com//files/erase1_109.png ------------------------------------------------------------------------------------- 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.