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Topic: | Wiring an electrical contactor? This thread has 28 replies. Displaying posts 16 through 29. |
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Post 16 made on Tuesday February 11, 2014 at 12:34 |
Ernie Gilman Yes, That Ernie! |
Joined: Posts: | December 2001 30,104 |
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T for tap. Thanks! I suspected it meant something logical but had no clue.
The A designation might refer back to the days of tubes and, well, relay power supplies.
Early tube components had two batteries, the A and B. "A" was six or twelve volts and lit up the filaments, which gave off electrons that were drawn to the plate. The plate was charged with the B battery. I've seen 45 volt and 90 volt batteries for this purpose. Ever hear of "B+"? That's the voltage on the plate from the B battery.
As electronics got converted to line-powered devices, the reference to batteries because a reference to supply voltages, and they were soon called filament supply and B+. The origin of the terms was forgotten. Everybody referred to the plate voltage as B+; nobody referred to a B supply; and nobody referred to the filament voltage or supply as A. I ran across that reading some old tech texts.
So maybe that's where A comes from for the relay coil, as it's the main voltage that causes something to happen.
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A good answer is easier with a clear question giving the make and model of everything. "The biggest problem in communication is the illusion that it has taken place." -- G. “Bernie” Shaw |
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Post 17 made on Tuesday February 11, 2014 at 13:00 |
para19 Long Time Member |
Joined: Posts: | December 2012 124 |
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A1 and A2 are the control contacts as mentioned above. You could have addition Terminals like AUX1 and AUX2 with are obviously auxiliary contacts with you want to control another contactor or equipment (I have seen them label A1 and A2 as well). You could go to any real electrical wholesaler (not a HD or Mom & Pop Hardware store) and the person at the desk would gladly answer your question regarding your contactor.
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There is always money in the banana stand... |
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Post 18 made on Tuesday February 11, 2014 at 13:47 |
Ernie Gilman Yes, That Ernie! |
Joined: Posts: | December 2001 30,104 |
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...well, I think it was becoming obvious that the guy at the counter of his electrical house was not very knowledgeable....
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A good answer is easier with a clear question giving the make and model of everything. "The biggest problem in communication is the illusion that it has taken place." -- G. “Bernie” Shaw |
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OP | Post 19 made on Tuesday February 11, 2014 at 18:46 |
Hertz Active Member |
Joined: Posts: | December 2007 657 |
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Installed and working like a champ.
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Post 20 made on Wednesday February 12, 2014 at 02:45 |
davidcasemore Super Member |
Joined: Posts: | January 2003 3,352 |
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On February 11, 2014 at 05:29, fcwilt said...
But then if you don't know what they mean maybe you shouldn't be the one putting it in? +1
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Fins: Still Slamming' His Trunk on pilgrim's Small Weenie - One Trunk at a Time! |
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Post 21 made on Friday August 21, 2015 at 19:45 |
ElectricNEWB Lurking Member |
Joined: Posts: | August 2015 1 |
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Post 22 made on Saturday August 22, 2015 at 02:07 |
Ernie Gilman Yes, That Ernie! |
Joined: Posts: | December 2001 30,104 |
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Hmmm. An armature is a moving part. On the other hand, it's the rotating coil or coils of a dynamo or electric motor So maybe the essence of armature is COIL, not MOVING, as I thought.
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A good answer is easier with a clear question giving the make and model of everything. "The biggest problem in communication is the illusion that it has taken place." -- G. “Bernie” Shaw |
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Post 23 made on Saturday August 22, 2015 at 09:23 |
tomciara Loyal Member |
Joined: Posts: | May 2002 7,965 |
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On August 21, 2015 at 19:45, ElectricNEWB said...
The A is for Armature!!! And "N" is for newbie, someone who responds to thread that is one and a half years old.
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There is no truth anymore. Only assertions. The internet world has no interest in truth, only vindication for preconceived assumptions. |
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Post 24 made on Saturday August 22, 2015 at 13:07 |
Eh, gotta start somewhere. I may or may not have done the same thing when learning about online forums...
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Web Design | Hosting - www.bz303.com |
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Post 25 made on Saturday August 22, 2015 at 15:06 |
Ernie Gilman Yes, That Ernie! |
Joined: Posts: | December 2001 30,104 |
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On August 22, 2015 at 09:23, tomciara said...
And "N" is for newbie, someone who responds to thread that is one and a half years old. That is definitely a newbie thing. What puzzles me is oldtimers here getting irritated when they then add responses, then catch on a couple of posts later to the fact that they're wasting their time and get pissed off about it! At least that didn't happen this time.
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A good answer is easier with a clear question giving the make and model of everything. "The biggest problem in communication is the illusion that it has taken place." -- G. “Bernie” Shaw |
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Post 26 made on Tuesday July 24, 2018 at 20:22 |
On August 22, 2015 at 09:23, tomciara said...
And "N" is for newbie, someone who responds to thread that is one and a half years old. Seems like a good thread for an initial post. Well since the poster's user name is "ElectricNEWB", I guess the label "newbie" just might fit. Having read through this thread while on my own quest to learn/verify the terminal naming conventions for contactors, I for one was quite glad to see the rationale for the "A1" and "A2" designations laid out. Something that none of the non-newbies had previously managed to provide. And ElectricNEWB's post certainly added more value than yours (or mine, for that matter). So belated thanks to ElectricNEWB for sharing and sorry if anyone is offended by resurrecting an old thread. But then again the ability to find these old threads via internet search engines adds considerable value to these forums. At least for some of us...
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Post 27 made on Tuesday July 24, 2018 at 20:37 |
3PedalMINI Loyal Member |
Joined: Posts: | July 2009 7,860 |
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It’s so weird, I was just looking up contactor wiring over the weekend for a project I’m working on and saw this post 4 items down....funny thing was it wasn’t related to anything but A1-A2 contactor on a 24v timer delay.
Pretty crazy how well google ranks RC!
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The Bitterness of Poor Quality is Remembered Long after the Sweetness of Price is Forgotten! - Benjamin Franklin |
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Post 28 made on Tuesday July 24, 2018 at 20:43 |
On August 22, 2015 at 02:07, Ernie Gilman said...
Hmmm. An armature is a moving part. On the other hand, it's "the rotating coil or coils of a dynamo or electric motor" So maybe the essence of armature is COIL, not MOVING, as I thought. Well let's see what Wikipedia, that most authoritative of sources, has to say on the matter: "In electrical engineering, an armature is the power-producing component of an electric machine. The armature can be on either the rotor (rotating part) or the stator (stationary part) of the electric machine. The armature interacts with the magnetic field (magnetic flux) in the air-gap; the field component can comprise either permanent magnets, or electromagnets formed by a conducting coil, such as another armature (i.e., doubly-fed electric machine). The armature, in contrast, must carry current, so it is always a conductor or a conductive coil, oriented normal to both the field and to the direction of motion, torque (rotating machine), or force (linear machine). The armature's role is twofold. The first is to carry current crossing the field, thus creating shaft torque in a rotating machine or force in a linear machine. The second role is to generate an electromotive force (EMF)." So the contactor/relay is an example of a electromagnetic linear machine in which the ends of the conducting coil comprising an armature are commonly labeled 'A1' and 'A2'. Now I can rest easy for a while.
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Post 29 made on Wednesday July 25, 2018 at 00:51 |
Ernie Gilman Yes, That Ernie! |
Joined: Posts: | December 2001 30,104 |
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On July 24, 2018 at 20:43, Jstrick said...
Well let's see what Wikipedia, that most authoritative of sources, Hey, guys, another comedian has joined us! has to say on the matter:
"In electrical engineering, an armature is the power-producing component of an electric machine. The armature can be on either the rotor (rotating part) or the stator (stationary part) of the electric machine.
The armature interacts with the magnetic field (magnetic flux) in the air-gap; the field component can comprise either permanent magnets, or electromagnets formed by a conducting coil, such as another armature (i.e., doubly-fed electric machine).
The armature, in contrast, must carry current, so it is always a conductor or a conductive coil, Like I said: it's a coil. oriented normal to both the field and to the direction of motion, torque (rotating machine), or force (linear machine). The armature's role is twofold. The first is to carry current crossing the field, thus creating shaft torque in a rotating machine or force in a linear machine. The second role is to generate an electromotive force (EMF)." The EMF is not generated by the armature. Instead, the armature and associated parts convert mechanical power to electrical power. Electrical power is not made out of nothing, while the armature spins without needing force applied to it! So the contactor/relay is an example of a electromagnetic linear machine in which the ends of the conducting coil comprising an armature are commonly labeled 'A1' and 'A2'. Nah, I don't think so. An electromagnetic linear machine's output would be motion with some power behind it (I can't think of a better way to express that). A relay's "output" is the closing of switch contacts solely so that electricity can flow elsewhere. Now I can rest easy for a while. I hope so.
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A good answer is easier with a clear question giving the make and model of everything. "The biggest problem in communication is the illusion that it has taken place." -- G. “Bernie” Shaw |
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