Today's Message Index:
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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
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Subject: | Re: 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
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Subject: | 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
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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
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Subject: | Re: 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
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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 . . .
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