---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Fri 12/24/21: 3 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 06:31 AM - Re: ULPower Alternator/Regulator (dj_theis) 2. 06:31 AM - Re: ULPower Alternator/Regulator (dj_theis) 3. 08:24 PM - Re: ULPower Alternator/Regulator (Sebastien) ________________________________ Message 1 _____________________________________ Time: 06:31:23 AM PST US Subject: AeroElectric-List: Re: ULPower Alternator/Regulator From: "dj_theis" > What kind of alternator is on the UL350, wound > field or permanent magnet? >From their website, all the UL 350 engines are listed as having integrated PMA charging systems with external R/R. All listed at 30 amp total and requiring 15 amps for the engine ignition and fuel pumps, leaving15 amps for Avionics. https://ulpower.com/en/engines/ul350/ul350is -------- Dan Theis Scratch building Sonex #1362 Still working on the Revmaster Alternator improvement Read this topic online here: http://forums.matronics.com/viewtopic.php?p=505371#505371 ________________________________ Message 2 _____________________________________ Time: 06:31:38 AM PST US Subject: AeroElectric-List: Re: ULPower Alternator/Regulator From: "dj_theis" > What kind of alternator is on the UL350, wound > field or permanent magnet? >From their website, all the UL 350 engines are listed as having integrated PMA charging systems with external R/R. All listed at 30 amp total and requiring 15 amps for the engine ignition and fuel pumps, leaving15 amps for Avionics. https://ulpower.com/en/engines/ul350/ul350is -------- Dan Theis Scratch building Sonex #1362 Still working on the Revmaster Alternator improvement Read this topic online here: http://forums.matronics.com/viewtopic.php?p=505372#505372 ________________________________ Message 3 _____________________________________ Time: 08:24:14 PM PST US From: Sebastien Subject: Re: AeroElectric-List: ULPower Alternator/Regulator As Dan already posted, the alternator is permanent magnet. I was wondering more if anyone knows if the voltage regulator has any over-voltage protection included. ULPower are apparently very good about responding to inquiries so I will send them an email and post the reply to this list. In any case, the electrical system on the aircraft in question has already been installed but was designed by a highly qualified and experienced electrical & robotics engineer with no GA aircraft knowledge. The aircraft owner sent me the diagram so that I could admire it but a quick and dirty FMEA showed some problems. A review of the manufacturer's instructions lead me to suggest that they rewire it to conform with those instructions but since the alternator wiring already includes a current limiter and a solenoid I thought it would be appropriate to leave those in rather than create the problem Joe pointed out vis a vis shorted b lead.1 If I can get permission I will post the schematic to the list; notwithstanding its problematic features it's quite a work of art. Regards, Sebastien On Thu, Dec 23, 2021 at 2:11 PM Robert L. Nuckolls, III < nuckolls.bob@aeroelectric.com> wrote: > At 11:16 AM 12/23/2021, you wrote: > > Does anyone have experience with this system? My friend is installing a > UL350 Engine and their wiring diagram and instructions specify no > protective > devices between the alternator and the battery. > > > Protecting b-lead wiring from hard faults within > the alternator itself is a legacy protocol in > T/C aircraft since the first Ford alternator was > bolted to a Cessna (approx 1964). > > However, LOTS of automotive applications tie > the alternator b-lead right to battery (+) > (like my '87 GMC) with some later models > adding a fusible link at the battery end > (like the 97 Chevy I worked on last week). > > What kind of alternator is on the UL350, wound > field or permanent magnet? > > Does anyone know if this alternator/regulator combination > can suffer from an overvoltage event? Or is the regulator > fault tolerant? > > > There is NO alternator system immune to OV events. > Probability, severity and risk run the gamut from > a little puff of smoke to a major incendiary event. > That needs to be sorted out in a failure mode > effects analysis with appropriate prophylactics > incorporated. > > As supplier of the system, the engine manufacturer > SHOULD have conducted those studies and published > well considered protocols in their manual . . . > unfortunately, few engine suppliers have any notion > of what that process entails. > > The usual answer to a query on the matter is: "we've > got xxxx of these flying with no reported events of > noteworthy magnitude." > > For this List to offer any more considered advice, > much more data are needed as to system characteristics. > The SAFE thing is to incorporate b-lead and ov protection > as a matter of policy . . . it's light, cheap and better > to have it and not need it as opposed to needing and > not having. > > Bob . . . > > Un impeachable logic: George Carlin asked, "If black boxes > survive crashes, why don't they make the whole airplane > out of that stuff?" > ------------------------------------------------------------------------------------- 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.