Today's Message Index:
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1. 06:42 AM - Re: Switch Position within the Circuit (user9253)
2. 07:14 AM - Re: Re: Switch Position within the Circuit (ROGER & JEAN CURTIS)
3. 07:18 AM - Re: Re: Switch Position within the Circuit (Robert L. Nuckolls, III)
4. 10:47 AM - Re: Switch Position within the Circuit (stearman456)
Message 1
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| Subject: | Re: Switch Position within the Circuit |
The master contactor is an example of switching the negative side of a circuit.
There is nothing wrong with doing it that way as long as good workmanship is
used. If the aircraft is not wired according to common practices, it will be
confusing to future troubleshooters. It is better to follow convention unless
there is a compelling reason to be different.
Joe
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Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=342491#342491
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| Subject: | Re: Switch Position within the Circuit |
The master contactor is an example of switching the negative side of a
circuit. There is nothing wrong with doing it that way as long as good
workmanship is used. If the aircraft is not wired according to common
practices, it will be confusing to future troubleshooters. It is better to
follow convention unless there is a compelling reason to be different.
Joe
Correct me if I am wrong but, I believe that what joe is
saying is that the switch which controls the master contactor goes to
ground. The master contactor itself is on the positive side very close to
the battery.
Roger
Message 3
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| Subject: | Re: Switch Position within the Circuit |
At 12:44 PM 6/8/2011, you wrote:
>
>Of course! All it would take is a chafed wire. Man, I can be
>dumb. Thanks for the help - back to the drawing board!
>
>Dan
It is not uncommon to have pull-to-ground control
systems. Our automobiles have them at every door
light switch, hour-meters on many airplanes pull-to-
ground. There are dozens of ground-side switched
circuits in a Beechjet.
You do what becomes the most elegant solution to
your design goals. Of course, all circuits are
protected upstream by fuse or breaker . . . which
is what deals with issue of electrical hazard. But
don't add parts count just to steer away from
ground-side switching.
Bob . . .
Message 4
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| Subject: | Re: Switch Position within the Circuit |
Thanks, Bob. I like to stick with convention but I'll have a good long stare at
it tonight with your advice in mind.
I appreciate the help, everybody.
Dan
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=342522#342522
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