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
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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
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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
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| Subject: | 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
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