---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Fri 07/20/18: 7 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 05:12 AM - Re: MFJ-259B For sale (Robert L. Nuckolls, III) 2. 10:00 AM - Voltage regulator wiring with fault indication. (Matthew Schumacher) 3. 01:09 PM - Re: Voltage regulator wiring with fault indication. (Robert L. Nuckolls, III) 4. 01:27 PM - Re: Voltage regulator wiring with fault indication. (Matthew Schumacher) 5. 04:47 PM - Re: IGNORE (donjohnston) 6. 08:08 PM - Re: B&C switches (blues750) 7. 08:38 PM - MANL's (current limiters) (blues750) ________________________________ Message 1 _____________________________________ Time: 05:12:32 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: MFJ-259B For sale At 09:29 PM 7/19/2018, you wrote: >Hi Bob, Is there a single unit available that covers most or all of >the aviation frequencies. I also have a nine year old one owner MFJ >259B and would be interested in knowing what you plan to buy as a >replacement.. Thanks Don. https://goo.gl/Yp8GNn Bob . . . ________________________________ Message 2 _____________________________________ Time: 10:00:17 AM PST US From: Matthew Schumacher Subject: AeroElectric-List: Voltage regulator wiring with fault indication. I've been trying to figure out why Bob doesn't show the "I" terminal used in Z11. Looking further it seems there are multiple ways to wire a ford regulator: http://www.erareplicas.com/427man/wiring/alt.htm So why not wire it the second way so that we have a alternator out indication? Someone please tell me what I'm missing. thanks, schu ________________________________ Message 3 _____________________________________ Time: 01:09:38 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Voltage regulator wiring with fault indication. At 11:59 AM 7/20/2018, you wrote: > >I've been trying to figure out why Bob doesn't >show the "I" terminal used in Z11.=C2 Looking >further it seems there are multiple ways to wire a ford regulator: > >http://www.erareplicas.com/427man/wiring/alt.htm > >So why not wire it the second way so that we >have a alternator out indication?=C2 Someone please tell me what I'm missing. Waayyyyyy back when, the first alternators to go onto Cessna single engine aircraft used the same regulator as the 1965 Ford passenger cars and an a similar alternator. In cars, the alternator's AUX terminal (fed from the center tap of a "Y-wound" alternator stator winding) was connected to the regulator's "S" terminal. Back then "S" meant "stator". The "I" termnial was feed from the "ignition" switch through a light bulb. That little current flow through bulb would 'tickel' the alternator field with juse enough current to present a volage at the alternator's AUX terminal but ONLY if the alternator was turning. Hence, this light spoke more to broken belts on the engine than it did to loss of electrical functionality of the alternator. http://www.aeroelectric.com/Reference_Docs/Alternator_Data/Legacy_EM_Regulat or_(Ford).pdf When this decidedly automotive system was adapter to the airplane at Cessna, the first systems went in like this: Emacs! Here, the "S" terminal became "switch" and the field relay got power directly from the bus as opposed to the AUX terminal. It no longer sensed rotation of the alternator. The "I" terminal could have been used to drive a light . . . but it was even less meaningful than when used in cars . . . it would be dark any time the field switch was ON whether or not the alternator was actually producing power. Electronic replacments for the electro-mechanical regulators have modified functionality of the "I" terminal somewhat . . . but it would take some testing to understand it and incorporate that functionality into your operations. It's MUCH simpler and universally accurate to incorporate ACTIVE NOTIFICATION OF LOW VOLTAGE. This feature's utility is unambiguous. The light CANNOT go dark unless the altenrator is working. Bob . . . ________________________________ Message 4 _____________________________________ Time: 01:27:08 PM PST US Subject: Re: AeroElectric-List: Voltage regulator wiring with fault indication. From: Matthew Schumacher On 7/20/18 12:08 PM, Robert L. Nuckolls, III wrote: > At 11:59 AM 7/20/2018, you wrote: >> >> >> I've been trying to figure out why Bob doesn't show the "I" terminal >> used in Z11. Looking further it seems there are multiple ways to >> wire a ford regulator: >> >> http://www.erareplicas.com/427man/wiring/alt.htm >> >> >> So why not wire it the second way so that we have a alternator out >> indication? Someone please tell me what I'm missing. > > > It's MUCH simpler and universally accurate to > incorporate ACTIVE NOTIFICATION OF LOW VOLTAGE. > This feature's utility is unambiguous. The > light CANNOT go dark unless the altenrator is > working. > > > Bob . . . > Thanks for the clarification. That helps a lot! ________________________________ Message 5 _____________________________________ Time: 04:47:23 PM PST US Subject: AeroElectric-List: Re: IGNORE From: "donjohnston" This guy has posted the same thing on a couple different boards. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=481778#481778 ________________________________ Message 6 _____________________________________ Time: 08:08:53 PM PST US Subject: AeroElectric-List: Re: B&C switches From: "blues750" Great discussion and certainly worth consideration of the points alluded to here and specifically mentioned on the VAF forum thread. I do believe if I ever built another EAB airframe, I would be up to the challenge of doing the wiring to cover my systems and intended usage with way more insight than what I had prior to this first project. For now, my system is what it is, and the aircraft will be operated with consideration for the fault/failure potential. The risk I accept can be somewhat mitigated through thorough and particular attention to maintenance, favorable flight conditions, conservative operational usage and pilot training/proficiency. Eventually, I may even retrofit this airframe with a different engine and/or panel which would allow me to redesign the electrical system as well. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=481781#481781 ________________________________ Message 7 _____________________________________ Time: 08:38:59 PM PST US Subject: AeroElectric-List: MANL's (current limiters) From: "blues750" Are MANL standard size, standard specs other than Amp rating? I have one and would like to have one or two on hand, but really don't know how to source without some sort of spec -- Thanks! P.S. 'Lectric Bob if you read this, I am trying to match the one I received from you in the care package recently. How do I spec it othe than Amps? Cheers! Dave Read this topic online here: http://forums.matronics.com/viewtopic.php?p=481782#481782 ------------------------------------------------------------------------------------- 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.