---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Sun 05/19/13: 5 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 03:10 AM - Re: Lithium Ion Battery for OBAM aircraft pr oject (jan) 2. 08:19 AM - Re: Z13/8 all electric airplane (jonlaury) 3. 10:05 AM - Re: Re: Z13/8 all electric airplane (Bob McCallum) 4. 11:20 AM - Re: Lithium Ion Battery for OBAM aircraft pr oject (Robert L. Nuckolls, III) 5. 11:38 AM - Re: Re: Z13/8 all electric airplane (Robert L. Nuckolls, III) ________________________________ Message 1 _____________________________________ Time: 03:10:38 AM PST US From: jan Subject: RE: AeroElectric-List: Lithium Ion Battery for OBAM aircraft pr oject Hi Bob, I am going to the US next month for 2 weeks with work - was thinking of picking up a copy of your book. From a previous post - I noted that you are working on a 'complete update' - (or maybe I got this wrong ??) .. If a new book will be available - will it be so in time for my visit ?? I am going to Kansas Have a good weekend ! Jan _____ From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Robert L. Nuckolls, III Sent: 11 May 2013 23:56 Subject: RE: AeroElectric-List: Lithium Ion Battery for OBAM aircraft project I believe that they mean UL1642. http://ulstandardsinfonet.ul.com/scopes/scopes.asp?fn=1642.html Could be. Thanks. I'll see if I can track down either one . . . Bob . . .

Hi Bob,

I am going to the US next month for 2 weeks with work – was thinking of picking up a copy of your book. From a previous post – I noted that you are working on a ‘complete update’ – (or maybe I got this wrong ??) ..

If a new book will be available – will it be so in time for my visit ?? I am going to Kansas

Have a good weekend !

Jan

From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Robert L. Nuckolls, III
Sent: 11 May 2013 23:56
To: aeroelectric-list@matronics.com
Subject: RE: AeroElectric-List: Lithium Ion Battery for OBAM aircraft project

I believe that they mean UL1642.

http://ulstandardsinfonet.ul.com/scopes/scopes.asp?fn=1642.html

Could be. Thanks. I'll see if I can track down
either one . . .

Bob . . .

http://www
.matronics.com/Navigator?AeroElectric-List

http://forums.matronics.com

http://www.matronics.com/
contribution

________________________________ Message 2 _____________________________________ Time: 08:19:44 AM PST US Subject: AeroElectric-List: Re: Z13/8 all electric airplane From: "jonlaury" [/quote] yep, here's a thread from 2008... Bob . . . [quote] Bob, My question was less about electron directional flow than it was about the fellow's intention to connect the switch/breaker to GND. Unless he is switching/breaking the GND to control the alternator field, which I thought in most instances was bad practice, isn't he wiring up a dead short that will trip the breaker everytime the alt field is switched on? Read this topic online here: http://forums.matronics.com/viewtopic.php?p=400944#400944 ________________________________ Message 3 _____________________________________ Time: 10:05:42 AM PST US From: Bob McCallum Subject: RE: AeroElectric-List: Re: Z13/8 all electric airplane Jon; Did you look at schematic Z13/8 to see what is being discussed?? There is no "field" associated with the AUX alternator as it's a PM type. (Dynamo in the dwg) The schematic clearly shows the breaker and switch connected between the alternator "B" lead relay and ground. And yes, when the over voltage module operates it causes a direct short to ground through this breaker tripping it. Bob McC > -----Original Message----- > From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list- > server@matronics.com] On Behalf Of jonlaury > Sent: Sunday, May 19, 2013 11:19 AM > To: aeroelectric-list@matronics.com > Subject: AeroElectric-List: Re: Z13/8 all electric airplane > > > [/quote] > yep, here's a thread from 2008... > > > > Bob . . . [quote] > > Bob, > My question was less about electron directional flow than it was about the fellow's > intention to connect the switch/breaker to GND. Unless he is switching/breaking the > GND to control the alternator field, which I thought in most instances was bad > practice, isn't he wiring up a dead short that will trip the breaker everytime the alt > field is switched on? > > > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=400944#400944 > > > > > > > > _- > ==================================================== > ====== > _- > ==================================================== > ====== > _- > ==================================================== > ====== > _- > ==================================================== > ====== > > ________________________________ Message 4 _____________________________________ Time: 11:20:35 AM PST US From: "Robert L. Nuckolls, III" Subject: RE: AeroElectric-List: Lithium Ion Battery for OBAM aircraft pr oject At 05:21 AM 5/19/2013, you wrote: >Hi Bob, > >I am going to the US next month for 2 weeks with >work ' was thinking of picking up a copy of your >book. From a previous post ' I noted that you >are working on a =91complete update=92 ' (or maybe I got this wrong ??) .. yes but several months out yet . . . > >If a new book will be available ' will it be so >in time for my visit ?? I am going to Kansas Where in Ks? Bob . . . ________________________________ Message 5 _____________________________________ Time: 11:38:09 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Re: Z13/8 all electric airplane >My question was less about electron directional flow than it was >about the fellow's intention to connect the switch/breaker to GND. >Unless he is switching/breaking the GND to control the alternator >field, which I thought in most instances was bad practice, isn't he >wiring up a dead short that will trip the breaker everytime the alt >field is switched on? As Bob suggests . . . trace the circuit. The alternator control switch is used to energize a relay that connects the PM alternator to the BUS. The control relay coil is paralleled with a crowbar OVM . . . open circuit 99.99% of the time but becomes a dead short when voltage across the device exceeds about 16.4 volts. The "short" across the relay coil would indeed force it to relax the contacts and disconnect the offending alternator from the bus. But it would also burn the wires that supply power to the relay coil through the closed switch. The goal for keeping one's cockpit smoke free suggest some form of fault current mitigation like a fuse, breaker, polyswitch, etc. In this case it's a breaker which can be ANYWHERE along the series path from bus to ground. Actually, I've been contemplating replacement of the breaker in that drawing with a polyswitch. Given the low current demands for driving the relay coil, this would be an excellent place to incorporate a polyswitch. I'm wrestling with annunciation issues. A popped breaker is, not a great annunciator but it's not bad. If we 'hide' a tripped condition by going solid state polyfuse, then perhaps some form of OV TRIP indication is called for. I've got some ideas and will incorporate the most elegant configuration into the Z-figures that control PM alternators with the RELAY/OVM combination. Bob . . . ------------------------------------------------------------------------------------- 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.