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Timed Relay for Latching Loop with Momentary Push Button

03/12/2016 2:44 PM

First of all, I am a complete newbie at this. My terms and drawings are basic and cartoonish, but I want to learn and explore since it fascinates me. I have a simple setup where I use a 12v battery to supply power to a multi switch relay that then does several other things (not relevant here). I use a momentary button switch.

The problem was, I didn't want to keep holding the button for continued current and I didn't want to use a toggle switch because I didn't want to forget to turn it off. So, I just ran a loop from the two terminals of the momentary button switch to latch it. Now, the main relay had continuous current, even when I released the momentary button switch.

You guessed the next problem I had, now I had to cut the power from its source to release the current from the main relay to reset it. So my question is, can I place one of these really cool delay timer switches on that latching loop so after the timer expires it will sever the latch current and reset the main relay until the momentary button is pressed again?

What I was thinking is running the loop to the VCC on the NE555 switch (red) and then back through the CB (blue). I would then run the ground back to the battery (green) and set the relay to 10 seconds, so after that time expires, the loop will be severed and both the main relay AND this timer relay is reset until the push button is pressed again.

What do you think? Will it work?

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#1

Re: Timed Relay for Latching Loop with Momentary Push Button

03/12/2016 5:00 PM

what are you trying to do, what is the application??

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#2

Re: Timed Relay for Latching Loop with Momentary Push Button

03/12/2016 6:02 PM

KISS

Digital timer $5.00 on ebay

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#3

Re: Timed Relay for Latching Loop with Momentary Push Button

03/12/2016 6:27 PM

This looks like a small programmable relay with a few inputs and outputs, and which probably can be programmed with a timer sequence to do what you want. A model number might help, but a functional description would probably help even more.

From a learning standpoint, you should familiarize yourself with relay/ladder logic.

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#4

Re: Timed Relay for Latching Loop with Momentary Push Button

03/13/2016 1:45 AM

Many years ago my job involved designing circuits for motorized systems, and one thing I had to include was a "run circuit" for lack of a better term.

In other words when the "Start" button was pushed by an operator, circuitry was required to keep the circuit energized until the "Stop" button was pushed by another operator (or an overload tripped the system).

Unfortunately I've forgotten the circuitry, but it was something quite simple; if I could learn it just out of school, it wasn't too complex.

You could include this "run circuit"as well as including the timer suggested by Lyn . Your setting on the timer would shut the circuit down after a preset time, or you would be able to de-energize the circuit if you chose to before the timer timed out.

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#5

Re: Timed Relay for Latching Loop with Momentary Push Button

03/13/2016 3:10 PM

Gregory,

It might be helpful to understand your problem if you first defined the actual sequence of events that you want to occur for the entire process without introducing any potential solutions.

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#6

Re: Timed Relay for Latching Loop with Momentary Push Button

03/13/2016 3:47 PM

It seems you are looking for an "off delay" circuit. After energizing, the relay is closed for a certain period of time.

Our very own Digikey has a vast number of them.

If it is industrial, go with premade, as they are certified. If you want to experiment, are great

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#7

Re: Timed Relay for Latching Loop with Momentary Push Button

03/13/2016 11:03 PM

yes it's possible.. to late to explain further. right track you're on.. g'night

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#8

Re: Timed Relay for Latching Loop with Momentary Push Button

03/14/2016 9:28 AM

Try replacing your 555 card idea with a second (Normally Closed -NC) switch. then you can "Break" the holding circuit with your new "STOP" switch.

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Users who posted comments:

Casper71 (1); Fredski (1); GravyTrain (1); JE in Chicago (1); JWthetech (1); lyn (1); Marv Trott (1); Tornado (1)

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