---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Sun 09/21/08: 10 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 05:10 AM - Re: Jabiru Alternator/Regulator OVM Problem (Robert Feldtman) 2. 07:39 AM - Garmin 296 hard wire (wypaul) 3. 08:38 AM - Re: Garmin 296 hard wire (Robert L. Nuckolls, III) 4. 11:44 AM - S2-Servo (Paul McAllister) 5. 01:30 PM - Z13/8 Aux Alternator Fuselink (Jeff Page) 6. 03:59 PM - Re: S2-Servo (Bill) 7. 04:11 PM - Re: S2-Servo (Robert Feldtman) 8. 05:37 PM - Re: S2-Servo (Charlie England) 9. 05:49 PM - S2 Swevo Navaid (Jim Wickert) 10. 08:13 PM - Re: Z13/8 Aux Alternator Fuselink (Robert L. Nuckolls, III) ________________________________ Message 1 _____________________________________ Time: 05:10:34 AM PST US From: "Robert Feldtman" Subject: Re: AeroElectric-List: Jabiru Alternator/Regulator OVM Problem I found the small 3A fuse in the voltage sample line to be loose, intermittently allowing for a break in the circuit, this too "low" a voltage, thus the VR would allow the voltage to rise intermittently which would of course pop the OV circuit breaker. The cheap 3 A fust holder was removed, and I put another 3 A in line fuse holder in place which stays snug. problem fixed bobf On Sat, Sep 20, 2008 at 10:35 PM, Michael Forhan wrote: > > I am running a Jabiru 2200 with about 60 hours. I have the B&C "crowbar" > overvoltage module ("OVM") installed and it has been fine until today. > > Today I flew for about half an hour. When I throttled back to about 2400 > RPM for descent the 5A circuit breaker began tripping. No problems were > noted at cruise RPM and idle/taxi RPM. > > There were no changes in the load on the electrical system--it's a basic > VFR setup with only a COM radio and engine gauges on the DC bus. > > The analog panel voltmeter is reading about 14 VDC with the breaker in, but > of course that would not provide any indication of transients that might be > tripping the OVM. > > I'm suspecting the regulator--I previously posted here about problems with > an unstable VDO tach reading with the tach input connected to an alternator > lead. Perhaps the problems are related. > > Before I start digging into the electrical system, has anyone else seen a > similar problem or have any suggestions? > > Thanks! > > ________________________________ Message 2 _____________________________________ Time: 07:39:23 AM PST US Subject: AeroElectric-List: Garmin 296 hard wire From: "wypaul" I purchased an automotive charging cable that I plan to use to hard wire my 296 to my plane. When I opened the cigarette lighter end there was a small, square ceramic in series with the positive lead. What is the function of this component? I use a small power jack in place of the cigarette lighter so I guess it is not really hard wired and would like to get rid of the extra bulk. Paul Spackman -------- Paul Spackman Q-2 Jabiru 3300 Read this topic online here: http://forums.matronics.com/viewtopic.php?p 5364#205364 ________________________________ Message 3 _____________________________________ Time: 08:38:27 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Garmin 296 hard wire At 07:37 AM 9/21/2008 -0700, you wrote: > >I purchased an automotive charging cable that I plan to use to hard wire >my 296 to my plane. When I opened the cigarette lighter end there was a >small, square ceramic in series with the positive lead. What is the >function of this component? I use a small power jack in place of the >cigarette lighter so I guess it is not really hard wired and would like to >get rid of the extra bulk. >Paul Spackman If it's a single, two-lead ceramic component, my best GUESS is a "Polyswitch". It's a sort of self-resetting circuit breaker. Here's a extensive description of these critters: http://en.wikipedia.org/wiki/Polyswitch For your purposes, an upstream fuse on the order of 2A or less would serve the same purpose. Having your accessory power jack fused at the bus is always a good thing. Bob . . . ----------------------------------------) ( . . . a long habit of not thinking ) ( a thing wrong, gives it a superficial ) ( appearance of being right . . . ) ( ) ( -Thomas Paine 1776- ) ---------------------------------------- ________________________________ Message 4 _____________________________________ Time: 11:44:56 AM PST US From: Paul McAllister Subject: AeroElectric-List: S2-Servo Hi All, I was wondering if anyone happened to know where the S2 Servo that Naviad use is sourced from. Trio seem to use a very similar servo in their product, perhaps it is the same unit, Anyhow, if anyone happens to know where these are sourced from I'd appreciate an heads up. Thanks, Paul ________________________________ Message 5 _____________________________________ Time: 01:30:22 PM PST US From: "Jeff Page" Subject: AeroElectric-List: Z13/8 Aux Alternator Fuselink There have been discussions here that the B&C SD-8 alternator can perhaps put out as much as 10A under some conditions. The wiring shown for it in Z13/8 is 14awg which matches the wire size charts for 10A. The Book indicates 4 awg sizes smaller for fuselinks, yet the fuselink shown for the SD-8 alternator at the main battery contactor is only 20awg. The same 14awg with 20awg fuselink combination is shown for the connection from the Endurance bus to the Alternate Feed relay. Should the fuselinks be 18 awg ? Thanks ! Jeff Page Dream Aircraft Tundra #10 ________________________________ Message 6 _____________________________________ Time: 03:59:57 PM PST US From: "Bill" Subject: Re: AeroElectric-List: S2-Servo Me also, and or any servo that will work with the navaid head. Bill ----- Original Message ----- From: Paul McAllister To: aeroelectric-list@matronics.com Sent: Sunday, September 21, 2008 1:42 PM Subject: AeroElectric-List: S2-Servo Hi All, I was wondering if anyone happened to know where the S2 Servo that Naviad use is sourced from. Trio seem to use a very similar servo in their product, perhaps it is the same unit, Anyhow, if anyone happens to know where these are sourced from I'd appreciate an heads up. Thanks, Paul ------------------------------------------------------------------------- ----- Checked by AVG - http://www.avg.com 9/21/2008 10:10 AM ________________________________ Message 7 _____________________________________ Time: 04:11:54 PM PST US From: "Robert Feldtman" Subject: Re: AeroElectric-List: S2-Servo check with trio - their's probably will. they have been very helpful bobf On Sun, Sep 21, 2008 at 5:57 PM, Bill wrote: > Me also, and or any servo that will work with the navaid head. > Bill > > ----- Original Message ----- > *From:* Paul McAllister > *To:* aeroelectric-list@matronics.com > *Sent:* Sunday, September 21, 2008 1:42 PM > *Subject:* AeroElectric-List: S2-Servo > > Hi All, > > I was wondering if anyone happened to know where the S2 Servo that Naviad > use is sourced from. Trio seem to use a very similar servo in their > product, perhaps it is the same unit, > > Anyhow, if anyone happens to know where these are sourced from I'd > appreciate an heads up. > > Thanks, Paul > > * > > href="http://www.matronics.com/Navigator?AeroElectric-List">http://www.matronics.com/Navigator?AeroElectric-List > href="http://forums.matronics.com">http://forums.matronics.com > href="http://www.matronics.com/contribution">http://www.matronics.com/c* > > ------------------------------ > - - Release Date: 9/21/2008 10:10 AM > > * > > * > > ________________________________ Message 8 _____________________________________ Time: 05:37:41 PM PST US From: Charlie England Subject: Re: AeroElectric-List: S2-Servo I can verify that. I bought a used Navaid & then discovered that they were out of business. Trio says that they can modify their current servo to work with the navaid head. Trio bought servos from Navaid until they came up with their own 'smart' servo. Charlie Robert Feldtman wrote: > > check with trio - their's probably will. they have been very helpful > > bobf > > > On Sun, Sep 21, 2008 at 5:57 PM, Bill > wrote: > > Me also, and or any servo that will work with the navaid > head. Bill > > ----- Original Message ----- > *From:* Paul McAllister > *To:* aeroelectric-list@matronics.com > > *Sent:* Sunday, September 21, 2008 1:42 PM > *Subject:* AeroElectric-List: S2-Servo > > Hi All, > > I was wondering if anyone happened to know where the S2 Servo > that Naviad use is sourced from. Trio seem to use a very > similar servo in their product, perhaps it is the same unit, > > Anyhow, if anyone happens to know where these are sourced from > I'd appreciate an heads up. > > Thanks, Paul > ________________________________ Message 9 _____________________________________ Time: 05:49:39 PM PST US From: Jim Wickert Subject: AeroElectric-List: S2 Swevo Navaid I believe you find this is packaged by Navaid and that it is a Micro Stepper Motor with a Micro chopper to give the count control and positioning that is packaged by them. Much like most of the Trim and altitude hold supplier (they will use a stepper motor and a chopper circuit). The key is to design the control circuit, the reduction graring and the brake. A lot of work for one off. VOE!!! Jim Wickert Vision #159 ________________________________ Message 10 ____________________________________ Time: 08:13:13 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Z13/8 Aux Alternator Fuselink At 04:28 PM 9/21/2008 -0400, you wrote: > >There have been discussions here that the B&C SD-8 alternator can >perhaps put out as much as 10A under some conditions. > >The wiring shown for it in Z13/8 is 14awg which matches the wire size >charts for 10A. Depending on the chart . . . 14AWG is good for 15A in a 10C rise design . . . see below . . . >The Book indicates 4 awg sizes smaller for fuselinks, yet the fuselink >shown for the SD-8 alternator at the main battery contactor is only >20awg. > >The same 14awg with 20awg fuselink combination is shown for the >connection from the Endurance bus to the Alternate Feed relay. > >Should the fuselinks be 18 awg ? No, current ratings for any given size of wire is dependent upon the TEMPERATURE RISE you're willing to tolerated along with VOLTAGE DROP you're willing to tolerate. The wire tables like those shown in http://aeroelectric.com/articles/Rev11/Ch8_R12.pdf are crafted for a 10C rise above ambient. In the case of using wire for fusible links, the fusible part is short . . . so it contributes little to overall voltage drop. We allow it to run a bit hotter to keep the wire size as small as practical (faster acting fuse for hard faults). In the cases you cited, 20AWG is at least 4 AWG steps smaller than 14, in fact it's 6 steps for an even faster fusing characteristic. Actually, you COULD use 22AWG for this fusible link if you wanted. See: http://aeroelectric.com/Pictures/Wire/22AWG_20A.pdf In this picture, we see a length of 22AWG wire in the foreground with a thermocouple attached. The wire has been carrying 20 amps for the last 30 minutes or so (temperature has stabilized). Note that the surface temperature of the wire is only 111C . . . we COULD run another 40C hotter without pushing this wire's insulation. 10A would drop the rise by about 1/2 down to about 85C. Even better yet. Fusible link fabrication is a special case that ignores (but does not abuse) the rules we use for sizing wire in bundles to carry power around the airplane. 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.