---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Wed 12/30/09: 3 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 10:01 PM - GNS 430 (Tim Andres) 2. 11:44 PM - Re: GNS 430 (Matthew Schumacher) 3. 11:46 PM - Questions about circuit protection. (Matthew Schumacher) ________________________________ Message 1 _____________________________________ Time: 10:01:54 PM PST US From: "Tim Andres" Subject: AeroElectric-List: GNS 430 I have a couple of questions re: the installation of a Garmin 430W. There are 7 separate power connections on the back of this unit. Two are labeled COMM, 1 "super flag" and the rest are labeled MAIN. There is nothing in the manual re: this other than the electrical load figures. What is common practice on these, 1 10 amp fuse & ganged together? I'm able to see the loads for the MAIN & COMM circuits so they could be fused separately. The second question is re: the "super flag", what is it? It shows as optional. I will not be using an indicator other than the GRT Horizons. Which by the way have a similar issue, that is 3 separate power inputs, which I understand from the manual how they work, but with an E bus and Brown out Batt. (Z-10/8) I think these will all be ganged together at the E-Bus fuse. There will be an Avionics master or at least an EFIS master as these units have no on/off switch, and GRT asks for one. I believe they would be protected anyway with Z-10/8 but I want to be able to shut down a misbehaving EFIS if needed. Thanks Tim Andres ________________________________ Message 2 _____________________________________ Time: 11:44:50 PM PST US From: Matthew Schumacher Subject: Re: AeroElectric-List: GNS 430 Tim Andres wrote: > I have a couple of questions re: the installation of a Garmin 430W. > There are 7 separate power connections on the back of this unit. Two are > labeled COMM, 1 super flag and the rest are labeled MAIN. There is > nothing in the manual re: this other than the electrical load figures. > What is common practice on these, 1 10 amp fuse & ganged together? Im > able to see the loads for the MAIN & COMM circuits so they could be > fused separately. > I just got my 430W from Steinair. They made up power harnesses where P4002 has pins 11-12 ganged together to a single 18AWG wire and P4001 where pins 15,19,20,71 where all ganged together to a single 22AWG wire. I'm planning tying those together on the e-bus. Sorry I couldn't be more helpful, I'm just now sorting this out myself. schu ________________________________ Message 3 _____________________________________ Time: 11:46:00 PM PST US From: Matthew Schumacher Subject: AeroElectric-List: Questions about circuit protection. List, I'm finally closing in on completing my wiring diagram. I have the basics roughed in but wanted to get some review on it and also ask some specific questions about circuit protection: 1. Do my wire sizes look sane? I read though Bob's documentation on wire sizes and I think I have it mostly figured out, but wanted to double check. 2. I want to have an avionics master switch, but also an e-bus. Since the only 3 things I'm running on my e-bus are avionics, I decided to drive the ebus from the avionics bus though a diode. The goal is to be able to turn on the avionics master, then the ebus alternate feed. If I loose my master contactor or the avionics master switch, then my ebus will continue to work. I think I have eliminated all single points of failure while maintaining an avionics master. Can someone take a look and make sure I'm not missing something obvious? 3. My drawing is missing all of the circuit protection except for the ANL, and 5 amp breaker for the field coil. I want to add breakers for the rest, but I don't think I need a breaker for each device as that will get real expensive. Can I group up some of the lighting on a single breaker? Also, what about using a breaker for the entire e-bus then omitting the breakers for the devices on the ebus? The lines will be real short and it eliminates the single point of failure (breaker.) Also, what about fuselinks? I understand them to be like a fuse that blows extremely slowly, but I'm not fully understanding when and where to use them. Any thoughts or suggestions would be super!! schu ------------------------------------------------------------------------------------- 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.