---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Thu 01/27/22: 5 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 06:33 AM - Re: Residue on negative battery pole (Robert L. Nuckolls, III) 2. 11:59 AM - Re: Re: Why CB on regulator field supply? (Steve Kelly) 3. 02:04 PM - Re: Residue on negative battery pole (Werner Schneider) 4. 04:34 PM - Re: Why CB on regulator field supply? (user9253) 5. 06:00 PM - Re: Battery capacity tester (Robert L. Nuckolls, III) ________________________________ Message 1 _____________________________________ Time: 06:33:26 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Residue on negative battery pole At 03:33 PM 1/25/2022, you wrote: >On 1/25/2022 3:10 PM, Werner Schneider wrote: >>I have a rear mounted battery so that would mean either a lot of >>work to replace or a short interconnect between the two cable types. What kind of airplane? Normally the first wires leading from a battery are quite short irrespective of location. https://tinyurl.com/yckf48xb Bob . . . Un impeachable logic: George Carlin asked, "If black boxes survive crashes, why don't they make the whole airplane out of that stuff?" ________________________________ Message 2 _____________________________________ Time: 11:59:56 AM PST US From: Steve Kelly Subject: Re: AeroElectric-List: Re: Why CB on regulator field supply? Bob, This discussion poses a (probably dumb) question. My system consists of a L40 alternator, LR3C-14 regulator and the 2 circuit breakers and lamp that come with B&C's installation kit. Also have the standard split rocker switch for batt and alt. The question is what is the appropriate action- in flight- to take if one of the breakers should pop or the light illuminates. While I'm sure I could muddle through it, it would be nice to have a clear course of action. If the 5A breaker pops does that mean there was an overvoltage situation. If I reset it one time and it pops again, does that mean there is a problem with the regulator? What about a warning lite and the breakers don't pop. Does that mean that maybe the alternator is not producing power? Also, for me at least, being primarily VFR neither situation would be considered an emergency. Thanks, Steve On Thu, Jan 20, 2022 at 12:03 PM Robert L. Nuckolls, III < nuckolls.bob@aeroelectric.com> wrote: > > The characteristics of fuses vs. CB and nuisance trips were my guesses > also, but I was hoping someone had more than a guess. Since the alternator > supply is on a switch, I am not sure using a CB to manually turn off the > alternator is needed as you can just turn off the alternator switch. > > > ASSUMING elects to incorporate crowbar ov > protection in their project, then to mitigate > possible but RARE nuisance trips of the OV > system, a crew accessible circuit breaker is > the field supply protection of choice. In > the event of an OV trip event, the pilot has > an opportunity to reset the breaker ONE time > to confirm the existence of failure in the > alternator's regulator. > > ADDITIONALLY, if one chooses to use a DPST > battery master switch, battery and alternator come > ON-OFF together, the a pullable field supply > breaker is handy for disabling the alternator > for battery only ground operations thus elininating > an energy wasting, full-field drain on the battery. > > NOTE. When picking a breaker for upstream management > of field supply in the crowbar system, it is a > really good idea to pick a breaker that is (1) > qualified to function as designed after a substantial > number of hard-fault trips. (2) actuates really > fast under the typical 50 to 200A current pulse > that an OV event impresses on the device. This style of breaker > is highly recommended for this application: > > http://aeroelectric.com/Pictures/Breakers/circuitbreakers.jpg > > This is one of many breakers NOT suited for service > upstream of a crowbar ov management device: > > http://aeroelectric.com/Pictures/Breakers/Breaker_Failure_1a.jpg > > Note also that all wound-field, alternator controllers > from B&C feature built-in crowbar ov management systems. > Incorporation of the recommended breaker applies to > these products. I've had a few readers over the years > who elected to protect their field supply with a fuse . . . > this is no more hazardous than a host of other > alternator failures . . . but pretty inconvenient > if that fuse resides in the recommended out-of-sight- > out-of-mind location in the airplane. > > > Bob . . . > > Un impeachable logic: George Carlin asked, "If black boxes > survive crashes, why don't they make the whole airplane > out of that stuff?" > ________________________________ Message 3 _____________________________________ Time: 02:04:46 PM PST US Subject: Re: AeroElectric-List: Residue on negative battery pole From: Werner Schneider Hi Bob, you're right, the positive wire is pretty short as the solenoid is located on the battery, however the negative one goes about ten feet to the firewall. This is on a Glastar with the battery in the tail section (composite fuselage). BTW very interesting today, we did today 3 flights, start was not very enthusiastic, but ok, but then landing after the 3rd flight and refueling (probably 10 Minutes) the battery did refuse (after a 40 min flight) to turn the prop, after 2 attemps it went better (heated up?). So most probably the battery behind there was cold soaked in the flight (-5 deg Celsius on 5000 ft) which is causing the main problems, anyway we need to replace this one probably got a bad unit. Thanks Werner On 27.01.2022 15:32, Robert L. Nuckolls, III wrote: > At 03:33 PM 1/25/2022, you wrote: >> On 1/25/2022 3:10 PM, Werner Schneider wrote: >>> I have a rear mounted battery so that would mean either a lot of >>> work to replace or a short interconnect between the two cable types. > > =C2- What kind of airplane? Normally > =C2- the first wires leading from a battery > =C2- are quite short irrespective of > =C2- location. > > https://tinyurl.com/yckf48xb > > > =C2- Bob . . . > > =C2- Un impeachable logic: George Carlin asked, "If black boxes > =C2- survive crashes, why don't they make the whole airplane > =C2- out of that stuff?" > ________________________________ Message 4 _____________________________________ Time: 04:34:59 PM PST US Subject: AeroElectric-List: Re: Why CB on regulator field supply? From: "user9253" Whenever any circuit breaker pops, it is best to wait until safely on the ground before resetting or troubleshooting. Circuit breakers can trip due to over current, or short circuits, or from loose wire terminals that make heat. The best indicator of charging system failure is a voltmeter showing low voltage (less than 13.5VDC). -------- Joe Gores Read this topic online here: http://forums.matronics.com/viewtopic.php?p=505835#505835 ________________________________ Message 5 _____________________________________ Time: 06:00:05 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Battery capacity tester At 09:02 AM 1/26/2022, you wrote: >The one I have, has a length of resistor wire and draws 100A from a >12V battery for as long as the switch is pressed. They say the aim >it to not go below 10V in 5 seconds, or there-abouts Have you measured the actual test current? 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.