Secure Your Transformer Chamber with Automated Actions

[Manoj Sahu]

I have a transformer chamber with 2 doors.
What I have to do-
If any of the door is opened, this should happen-
1. 2 CFL inside transformer chamber should start
2. Simultaneously, a buzzer/hooter should be ON.
3. After opening the door, I should have option to reset the hooter.

how do I do it?

 

[gmax137]

You probably need to be sure your design doesn't just de-energize the buzzer -- you want to be sure it buzzes next time the door is opened.

 

[Averagesupernova]

You will want to use a relay or maybe two. A door switch should cut power to the lights, buzzer and relay when closed. When the door opens you want power to flow to the light, buzzer, and a relay contact. Use a push button switch to then cause a relay to latch on through it's own contacts. Also, this action will cut power to the buzzer. It needs to be wired so that when the door is closed again, power is cut to the relay so that it is unlatched. @gmax137 has the right idea about the buzzer needing to buzz the next time the door is opened. I will not draw a schematic for you. Have a go at it based on what I described and let's see what you come back with.

 

[Windadct]

You have (probably) not fully defined the spec here.

Do you want to be able to turn on the light when both doors are closed. ( I assume yes)
Do you want the ability to turn OFF the light with one/both doors open?
Do you want the light to STAY on when both doors close. ( Probably - but then how does it get turned off)

Try to think of every scenario of entering, leaving, and working in the room.

 

[Manoj Sahu]

I am thinking of using a Contactor and limit switch on both the door and power both the CFL and buzzer through it. So that when anyone of the door is opened, the contactor will close/energise and the CFL's and buzzer will ON. When the door is closed the contactor will de-energise/open turning off the CFL'S and buzzer. Will this scheme work?

And I want a reset button too so that when the door is opened I can turn off the buzzer(only) or otherwise it will continue to buzz. I am getting confused in this one... how do I do it? @Averagesupernova

 

[Asymptotic]

I am thinking of using a Contactor and limit switch on both the door and power both the CFL and buzzer through it. So that when anyone of the door is opened, the contactor will close/energise and the CFL's and buzzer will ON. When the door is closed the contactor will de-energise/open turning off the CFL'S and buzzer. Will this scheme work?

And I want a reset button too so that when the door is opened I can turn off the buzzer(only) or otherwise it will continue to buzz. I am getting confused in this one... how do I do it? @Averagesupernova

Yes, such a scheme can work. I won't speak for @Averagesupernova , but believe what he is looking for is your attempt at drawing a schematic of the required circuitry. Earlier today I began learning how to use LibreOffice Draw in the course of sketching one approach to the problem, but chose to not post it after reading his response as I'm also curious to see what you come up with.

 

[Manoj Sahu]

You have (probably) not fully defined the spec here.

Do you want to be able to turn on the light when both doors are closed. ( I assume yes)
Do you want the ability to turn OFF the light with one/both doors open?
Do you want the light to STAY on when both doors close. ( Probably - but then how does it get turned off)

Try to think of every scenario of entering, leaving, and working in the room.

No both the CFL should be OFF when the door is closed. Both the CFL should switch on only when anyone of the two door is opened.

 

[Averagesupernova]

Can you post a schematic of what you have come up with so far? Something scribbled out on a piece of paper would be fine. Just upload it as a photo.

 

[Windadct]

Based on this simple scheme - this can be done, with a single relay with an N/O and N/C contact, as log as the door switch(s) are rated to handle the load of the light, buzzer and Relay coil. Probably is.

We could sketch it out, but what have you come up with?

There are online diagramming tools, or LTSPice for free ( Spice not needed for any simulation - it is just a free program with all of the symbols you need) - there are probably others.

 

[Manoj Sahu]

I have drawn schematic but I am unable to post. It shows error "This forum has disabled media sharing" @Windadct @Averagesupernova

 

[Asymptotic]

I have drawn schematic but I am unable to post. It shows error "This forum has disabled media sharing" @Windadct @Averagesupernova

Were you attempting to use the 'media' button from the upper toolbar?
Site help indicates media sources are limited to these "approved sites: Dailymotion; Facebook; Liveleak; Metacafe; Vimeo; YouTube;". I haven't tried and verified it, but using the media button to link out to anything else could well generate a 'forum has disabled media sharing' error message.

The 'image' button can be used so long as the link is publicly accessible, but the preferred method is to "upload" the image to Physics Forum, and eliminate the possibility for the link to break if, for instance, the image hosting service ceases to exist.

 

[Manoj Sahu]

Were you attempting to use the 'media' button from the upper toolbar?
Site help indicates media sources are limited to these "approved sites: Dailymotion; Facebook; Liveleak; Metacafe; Vimeo; YouTube;". I haven't tried and verified it, but using the media button to link out to anything else could well generate a 'forum has disabled media sharing' error message.

The 'image' button can be used so long as the link is publicly accessible, but the preferred method is to "upload" the image to Physics Forum, and eliminate the possibility for the link to break if, for instance, the image hosting service ceases to exist.
View attachment 216935

I was uploading from my mobile. So it should not show such error.