---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Wed 01/24/18: 4 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 07:07 AM - Re: SD-8 Alternator Question (Airdog77) 2. 04:30 PM - Re: Re: SD-8 Alternator Question (Robert L. Nuckolls, III) 3. 06:08 PM - Re: SD-8 Alternator Question (Airdog77) 4. 08:07 PM - Re: Re: SD-8 Alternator Question (Ron Springer) ________________________________ Message 1 _____________________________________ Time: 07:07:39 AM PST US Subject: AeroElectric-List: Re: SD-8 Alternator Question From: "Airdog77" Bob, I believe you're referring to the fuse on the main connection to the battery contactor from the S704-1 relay? And Stu is referring to the SD-8 connection to the power bus, not the inline fuse depicted on one of the two alternator leads shown on the B&C diagram. I too have questions on whether this 15A fuse should be included, but figured since Bob depicts it twice without it --both in the Z-13/8 and Z-25 diagrams that include a bridge rectifier (that B&C doesn't) for self excitation-- then it wasn't required. Bob, can you confirm whether the 15A fuse at the actual SD-8 alternator feed is required or not if the self excitation feature is employed? Regards, Wade -------- Airdog Wade Parton Building Long-EZ N916WP www.longezpush.com Read this topic online here: http://forums.matronics.com/viewtopic.php?p=477529#477529 ________________________________ Message 2 _____________________________________ Time: 04:30:43 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Re: SD-8 Alternator Question At 09:06 AM 1/24/2018, you wrote: > >Bob, > >I believe you're referring to the fuse on the main connection to the >battery contactor from the S704-1 relay? > >And Stu is referring to the SD-8 connection to the power bus, not >the inline fuse depicted on one of the two alternator leads shown on >the B&C diagram. > >I too have questions on whether this 15A fuse should be included, >but figured since Bob depicts it twice without it --both in the >Z-13/8 and Z-25 diagrams that include a bridge rectifier (that B&C >doesn't) for self excitation-- then it wasn't required. > >Bob, can you confirm whether the 15A fuse at the actual SD-8 >alternator feed is required or not if the self excitation feature is employed? Good eye! I'd forgotten about that fuse being added some years ago. It's a good idea. One of the failure modes for the rectifier/regulator places a dead short on the SD-8 output. The fuse keeps the dynamo from smoking. The RMS current flowing out of the dynamo is about the same as the DC output current from the rectifier/regulator. This is a duty-cycle switched series regulator with no energy-storage . . . Bob . . . ________________________________ Message 3 _____________________________________ Time: 06:08:38 PM PST US Subject: AeroElectric-List: Re: SD-8 Alternator Question From: "Airdog77" Bob, Thanks for confirming that fuse should be installed. I literally just bolted my SD-8 to the vacuum pad during my engine build yesterday, so now I'll plan on adding back in that inline fuse. Ron- Thanks for asking the question.... perfect timing! Regards, Wade -------- Airdog Wade Parton Building Long-EZ N916WP www.longezpush.com Read this topic online here: http://forums.matronics.com/viewtopic.php?p=477557#477557 ________________________________ Message 4 _____________________________________ Time: 08:07:14 PM PST US From: Ron Springer Subject: Re: AeroElectric-List: Re: SD-8 Alternator Question No problem. Thanks Bob! Ron On Wed, Jan 24, 2018 at 9:06 PM, Airdog77 wrote: > > Bob, > > Thanks for confirming that fuse should be installed. I literally just > bolted my SD-8 to the vacuum pad during my engine build yesterday, so now > I'll plan on adding back in that inline fuse. > > Ron- Thanks for asking the question.... perfect timing! > > Regards, > Wade > > -------- > Airdog > Wade Parton > Building Long-EZ N916WP > www.longezpush.com > > ------------------------------------------------------------------------------------- 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.