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JOHN TIPTON
Joined: 17 Sep 2006
Posts: 239
Location: Torquay - England
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 Posted: Thu Aug 28, 2008 3:34 am Post subject: symbol meanings |
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If you ask a question, you may sometimes be a 'complete idiot' for 5
seconds - if you don't ask the question you may remain a 'complete idiot'
for the rest of your life
You are correct in you assumptions re: Normally Closed (circuit complete) -
Normally Open (circuit isolated)
Regards - John
---
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glastar(at)gmx.net
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| Posted: Thu Aug 28, 2008 4:16 am Post subject: symbol meanings |
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Hello Mick,
your assumption is a 100% correct and don't worry we all started there
one time!
Keep ongoing, you're doing well (BTW sometimes "googling" helps)
Werner
Mick Muller wrote:
| Quote: |
<mmul6471(at)bigpond.net.au>
Look as much as I hate to appear a complete idiot, I have to ask.
I have been studying the aero lectric connection. I have seen diagrams
and see switches that are labelled N-C and N-O .
Am I right to assume these mean Normally Closed and Normally Open
respectively??
Thanks, Mick the Greenhorn
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nuckolls.bob(at)cox.net
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| Posted: Thu Aug 28, 2008 5:03 am Post subject: symbol meanings |
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At 02:14 PM 8/28/2008 +0200, you wrote:
| Quote: |
Hello Mick,
your assumption is a 100% correct and don't worry we all started there one
time!
Keep ongoing, you're doing well (BTW sometimes "googling" helps)
Werner
Mick Muller wrote:
>
><mmul6471(at)bigpond.net.au>
>
>Look as much as I hate to appear a complete idiot, I have to ask.
>
>I have been studying the aero lectric connection. I have seen diagrams
>and see switches that are labelled N-C and N-O .
>Am I right to assume these mean Normally Closed and Normally Open
>respectively??
|
I've oft suggested to new students of the art that
schematics are "road maps" for electrons. The first
time we picked up an aeronautical chart, there was
much in common with Rand McNally road maps but with
many new cryptic symbols and terminology. By the time
we had a few cross country flights in the log, we
could communicate with some competence in the new
"language".
The schematics are no different so the advice of the
ages applies here too . . . until you ask, you
will endure the effects of not knowing.
Welcome to the AeroElectric-List classroom Mike.
Holler if any of us can help!
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
----------------------------------------
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andrewbutler(at)ireland.c
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| Posted: Thu Aug 28, 2008 5:37 am Post subject: symbol meanings |
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I scratched my head on that one too not so long ago.
Once I concluded (now confirmed to be correct) what NC and NO stood for I never really got what the word normally meant in this context.
I mean, how can a switch be Normally Open AND Normally Closed. I noted the apparent paradox, concluded I was missing something sublte and left it at that.
Now the phrases "circuit complete" and "circuit isolated" have appeared. These words appear to solve the paradox in that the word "normally" refers to the end result of normal operation rather than some sort of paradoxical indicator of what the normal operation of the switch should be........
Is this correct?
Andrew.
[quote]---
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dan(at)familybrown.org
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| Posted: Thu Aug 28, 2008 6:25 am Post subject: symbol meanings |
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Quoting Andrew Butler <andrewbutler(at)ireland.com>:
| Quote: | I mean, how can a switch be Normally Open AND Normally Closed. I noted
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This often happens with momentary switches. They'll have three
terminals--Common, NO, and NC. With the switch at rest, the circuit
from Common to NO is open, and from Common to NC is closed. When the
switch is activated (pressed, etc.), this reverses--Common to NO is
closed, and Common to NC is open. So, it's Normally Open or Normally
Closed depending on how you wire it.
--
Dan Brown, KE6MKS, dan(at)familybrown.org
"Since all the world is but a story, it were well for thee to buy the
more enduring story rather than the story that is less enduring."
-- The Judgment of St. Colum Cille
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lm4(at)juno.com
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| Posted: Thu Aug 28, 2008 2:04 pm Post subject: symbol meanings |
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Andrew,
The term "normally" can be known when you look at the drawings.
The switch is drawn normally closed or normally open depending on what the designer wants to do with the switch. The designer may draw the switch closed but put a weight on the switch arm. Now the switch is normally open
( held closed) or normally closed ( held closed). Or a spring on top of the switch arm. Now it's normally closed (held open) Etc. Etc.HTH.
Larry Mac Donald
lm4(at)juno.com (lm4(at)juno.com)
Rochester N.Y.
Do not archive
On Thu, 28 Aug 2008 13:36:38 +0000 "Andrew Butler" <andrewbutler(at)ireland.com (andrewbutler(at)ireland.com)> writes:
| Quote: | I scratched my head on that one too not so long ago.
Once I concluded (now confirmed to be correct) what NC and NO stood for I never really got what the word normally meant in this context.
I mean, how can a switch be Normally Open AND Normally Closed. I noted the apparent paradox, concluded I was missing something sublte and left it at that.
Now the phrases "circuit complete" and "circuit isolated" have appeared. These words appear to solve the paradox in that the word "normally" refers to the end result of normal operation rather than some sort of paradoxical indicator of what the normal operation of the switch should be........
Is this correct?
Andrew.
| Quote: | ----- Original Message -----
From: "JOHN TIPTON"
To: aeroelectric-list(at)matronics.com
Subject: Re: symbol meanings
Date: Thu, 28 Aug 2008 12:31:05 +0100
--> AeroElectric-List message posted by: "JOHN TIPTON"
If you ask a question, you may sometimes be a 'complete idiot' for 5 seconds - if you don't ask
the question you may remain a 'complete idiot' for the rest of your life
You are correct in you assumptions re: Normally Closed (circuit complete) - Normally Open
(circuit isolated)
Regards - John
----- Original Message ----- From: "Mick Muller"
To: "Aero lectric bob List"
Sent: Thursday, August 28, 2008 11:54 AM
Subject: symbol meanings
| Quote: | --> AeroElectric-List message posted by: "Mick Muller"
Look as much as I hate to appear a complete idiot, I have to ask.
I have been studying the aero lectric connection. I have seen diagrams and see switches that
are labelled N-C and N-O .
Am I right to assume these mean Normally Closed and Normally Open respectively??
Thanks, Mick the Greenhorn
|
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nuckolls.bob(at)cox.net
Guest
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| Posted: Thu Aug 28, 2008 7:03 pm Post subject: symbol meanings |
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At 01:36 PM 8/28/2008 +0000, you wrote:
| Quote: | I scratched my head on that one too not so long ago.
Once I concluded (now confirmed to be correct) what NC and NO stood for I
never really got what the word normally meant in this context.
I mean, how can a switch be Normally Open AND Normally Closed. I noted the
apparent paradox, concluded I was missing something sublte and left it at that.
Now the phrases "circuit complete" and "circuit isolated" have appeared.
These words appear to solve the paradox in that the word "normally" refers
to the end result of normal operation rather than some sort of paradoxical
indicator of what the normal operation of the switch should be........
Is this correct?
|
Pretty close. "Normal" in this case is usually applied to
two-position devices (push buttons, microswitches, relays, etc)
wherein the "normal" is the de-energized or relaxed state of a
spring-loaded mechanism. For example, in the photo at . . .
http://aeroelectric.com/Pictures/Switches/sm_switch_cutaway.jpg
The operating button is not depress and the switch is in its
"normal" state. The tiny letters sanded off when I opened this
switch labeled the left-most terminal "C" for common. The
As you can see by inspection, the right-most terminal is
presently connected to "C" and is the "NC" contact. The
middle terminal is presently not connected to anything and
is "NO".
Pushing the operator button transfers the mechanism and
the NO contact becomes connected while the NC contact is
disconnected.
In this picture, we see a 20A plastic relay . . .
http://aeroelectric.com/Pictures/Relays/Plastic_Relay_2.jpg
where coil, common, normally open and normally closed
markings are molded into the top. Quite often, terminals
are marked with numbers or not at all. In this case, there's
generally a schematic printed on the side of the device
that references connection numbers or their position
in the terminal pattern. See:
http://aeroelectric.com/Pictures/Relays/Mil-Spec_10A_Sealed.jpg
Bob . . .
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