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switch that turns off upon trigger

Mariano Garcia

Apr 15, 2014
4
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Apr 15, 2014
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Could you help me guys, im having a project that requires an alarm to turn of on some conditions. Here's the picture of it..

when the switch is in C, it would automatically alarm (switch is normally closed)
when the switch is switched off, the alarm will turn off



upload_2014-4-15_9-43-50.png



the thing is, i need something on the switches so that whenever the selector switch is turned to A or B, the switch will automatically return to it's original state..

i already messed with relays, PLC's and stuffs, i just can't figure out how to do it..
 

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KrisBlueNZ

Sadly passed away in 2015
Nov 28, 2011
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Hi Mariano, and welcome to the Electronics Point forums :)

I'm afraid I can't understand what you have, and I can't understand what you want to do!

It's a bit confusing that there is a selector switch and another switch, which seems to be some kind of sensing switch to trigger the alarm, is that right? Also I have no idea of what the PLC does, or what the overall system does, and what you want to make it do.

Do you want the selector switch to return to position C after it has been switched to position A or B? That sounds like a "biased" switch. These normally return to the centre position, so the positions would have to be A, C and B, in that order. A switch that does this is here: http://www.digikey.com/product-detail/en/M2026SS1W01/M2026SS1W01-ND/1027460

If that doesn't answer your question, please give a lot more detail about the system, what it does, and what you want it to do.
 

Mariano Garcia

Apr 15, 2014
4
Joined
Apr 15, 2014
Messages
4
Thank you for the reply Sir Kris but, I'm afraid you got it the other way around. So there're these two switches, the selector switch and the "other switch". The situation goes like this, if the selector switch is turned to C, the alarm would turn on. But there's this "other switch" that could turn the alarm off. So let's say, "I'm gonna use the C mode, cause I'm supposed to do something", so I'll use the "other switch" to turn the alarm off cause I don't want the alarm to be buzzing around when I'm operating at C mode. Now here's the thing, when the selector switch is turned from C mode to either A or B mode, the "other switch" would automatically re-close. My problem here is the "other switch". Is there any switch functioning like this? Or any device functioning this way?

I hope you got it.
Thank you sir.

upload_2014-4-15_9-43-50-png.12425
 
Last edited:

KrisBlueNZ

Sadly passed away in 2015
Nov 28, 2011
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Joined
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Messages
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Do you mean that you WANT the "other" switch to close automatically when you switch the selector switch to position A or B?

Normally, a switch can only change position when operated by a person. So you want a switch that can also be operated electrically?

I don't know of anything ready-made that will do this. There probably IS such a thing, but it would not be cheap, and I don't know what it's called.

It could be done using a solenoid - that is, an electromagnet that pulls a piece of metal. This piece of metal could slide a switch to a particular position.

It could also be done using a release mechanism, either with a hook or by magnetism. For example, when you push down the lever on a toaster, it stays down because of an electromagnet. You can test this by unplugging the toaster while it's running. The toast will pop up, because there's no voltage available to keep the electromagnet energised.

There are probably other ways of doing what you want. You haven't described it in detail yet. If you give us a lot more information on the purpose of this circuit, how it is constructed and installed, and how it is used, we may be able to suggest something.

One simple idea that comes to mind would be to replace the "other" switch with two pushbuttons that control a latching circuit (a relay can be used for this). The relay could be latched and unlatched by the two pushbuttons, but also unlatched when the selector switch is changed to position A or B. You could have an LED showing the current state of the relay.

If you tell us a lot more about the project, we should be able to help more.
 
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