---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Wed 10/15/08: 5 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 07:12 AM - Re: review electric drawing for Jabiru 3300 powered Sonex (Robert L. Nuckolls, III) 2. 09:19 AM - Circuit breaker for master relay? (Palvary) 3. 02:31 PM - Re: Contactors (Jeff Page) 4. 08:43 PM - Re: Circuit breaker for master relay? (Robert L. Nuckolls, III) 5. 08:54 PM - Re: Re: Contactors (Robert L. Nuckolls, III) ________________________________ Message 1 _____________________________________ Time: 07:12:00 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: review electric drawing for Jabiru 3300 powered Sonex At 01:03 PM 10/13/2008 +1100, you wrote: >Hi, > >I have drawn up a basic electrical drawing for my Sonex. I just want a >simple system that will be ok for a VFR only aircraft. I am very much a >newbie when it comes to aircraft electrical systems and all I really know >is what I have read in The AeroElectric Connection. I would like some of >you more knowledgeable folk to have a look at my drawing and make comment >on it. Is the wire sizing adequate? Does it require any inline fuses? What >about where the alternator circuit is connected? My thinking here was it >would be better to be able to disconnect alternator power to the cockpit >by turning off the master switch, than disconnecting alternator power to >the battery. > >Please feel free to say what you think, the more opinions the better. > >Cheers, > >Tim. What you've drawn will function as advertised but I'm curious as to why you did not adopt a version of Z-16 . . . http://www.aeroelectric.com/PPS/Adobe_Architecture_Pdfs/Z16M.pdf . . . your proposed system has no control over the alternator, no ov protection. I presume that your EIS has some form of low voltage warning but if not, that should be a component of your design goals as well. The choice of ignition/starter controls doesn't impact functionality. Z-16 with the e-bus removed seems more suited to service in the small airplane. Bob . . . ----------------------------------------) ( . . . a long habit of not thinking ) ( a thing wrong, gives it a superficial ) ( appearance of being right . . . ) ( ) ( -Thomas Paine 1776- ) ---------------------------------------- ________________________________ Message 2 _____________________________________ Time: 09:19:07 AM PST US From: "Palvary" Subject: AeroElectric-List: Circuit breaker for master relay? The button on the circuit breaker (CB) for my master relay (which I think is the same as a "battery relay" in the Z diagrams) broke off and I want to replace it. The CB still works. The I want to order one before I dis-assemble my panel, but can't read any numbers on the unit. The numbers are either not accessible or worn off. So....what size circuit breaker might be associated to the typical master relay...2 Amps? --Jose (Boston) ________________________________ Message 3 _____________________________________ Time: 02:31:00 PM PST US From: "Jeff Page" Subject: AeroElectric-List: Re: Contactors The GX11 looks like a high quality contactor. I like the fact that it is hermetically sealed. I will probably use one as my main battery contactor. What about a good quality relay for the cross-connect function ? It would need to handle 10A max (from an SD-8) ? Any recommendations ? Thanks, Jeff Page Dream Aircraft Tundra #10 ________________________________ Message 4 _____________________________________ Time: 08:43:09 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Circuit breaker for master relay? At 12:17 PM 10/15/2008 -0400, you wrote: > >The button on the circuit breaker (CB) for my master relay (which I think is >the same as a "battery relay" in the Z diagrams) broke off and I want to >replace it. The CB still works. The I want to order one before I >dis-assemble my panel, but can't read any numbers on the unit. The numbers >are either not accessible or worn off. So....what size circuit breaker might >be associated to the typical master relay...2 Amps? I'm not aware of a need for a circuit breaker in the master or battery relay control circuit. If you have a circuit breaker associated with this function, perhaps it is not necessary. In any case, there are virtually dozens of circuit breakers suited for use in aircraft. Does your breaker look anything like these? http://aeroelectric.com/Pictures/Breakers/circuitbreakers.jpg This form factor is commonly used throughout the aircraft industry and manufactured by at least a half-dozen manufacturers. B&C and Aircraft Spruce both sell them. But I'm skeptical that your battery relay circuitry benefits from the use of a circuit breaker. Bob . . . ----------------------------------------) ( . . . a long habit of not thinking ) ( a thing wrong, gives it a superficial ) ( appearance of being right . . . ) ( ) ( -Thomas Paine 1776- ) ---------------------------------------- ________________________________ Message 5 _____________________________________ Time: 08:54:02 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Re: Contactors At 05:26 PM 10/15/2008 -0400, you wrote: > >The GX11 looks like a high quality contactor. I like the fact that it >is hermetically sealed. I will probably use one as my main battery >contactor. > >What about a good quality relay for the cross-connect function ? It >would need to handle 10A max (from an SD-8) ? Any recommendations ? Sure. "Good quality" and "aircraft quality" are commonly used to describe parts suited for in aircraft . . . but are un-defined. A plastic, automotive relay rated at 20+ amps is suited for use as the alternator disconnect on an SD-8 installation. Typical relays include: http://aeroelectric.com/Pictures/Relays/Plastic_Relay_2.jpg http://aeroelectric.com/Pictures/Relays/s704-1l.jpg http://tinyurl.com/3uel5c http://tinyurl.com/4qpwo6 http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail?name=255-1830-ND All of these devices are assembled on automatic machines by the millions and designed to survive under the hood of cars . . . quite suited to our purposes under the cowls of airplanes. 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.