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28th January 2021, 02:18 PM #1Senior Member
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Adjustable 12 V DC Timer Relay Wiring
Members, seeking any advice about how to wire this unit. The purpose is to operate an automaton which is equipped with a 12V DC motor. At the press of the ON button, the unit powers on for around 35 seconds, disconnects. The cycle can be repeated. Experimented with the wiring, without success, cannot power the motor. I am missing something, due to very limited understanding of electronics. Any assistance would be greatly appreciated.
Should the + input be also connected to the center terminal of the NO - NC block ? Should T1 be turned more or less off, then T2 be adjusted to 35 seconds ? The Red led is on, as is the green, but no current detected at the output block.
Regards,
Gus
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28th January 2021 02:18 PM # ADSGoogle Adsense Advertisement
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28th January 2021, 03:29 PM #2Senior Member
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Sounds like the the unit is working apart from the output. Yes, you need to have one leg of a supply, that can be from a different source if you want, connected to switch through the relay contacts.
Red & black to 12volt DC supply
white to momentary action switch normally open, press to make contact
jumper bridge on OP3 and OP1
adjust T2 for timing
a 12v + to common terminal on relay
output from relay normally open terminal and negative to your load
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28th January 2021, 04:50 PM #3.
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Have you got 12V supplied separately to the motor?
The blue box is only a switch/relay - it will not supply power to the motor.
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28th January 2021, 06:29 PM #4Senior Member
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28th January 2021, 07:15 PM #5Senior Member
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29th January 2021, 07:52 AM #6Senior Member
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29th January 2021, 08:44 AM #7.
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1st February 2021, 11:21 AM #8Senior Member
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With your help gentlemen, the relay works, thank you both ! May i ask another question ?
The automaton's cycle ends with a door which slides closed. The relay disconnects with the set seconds, this results in an inaccurate cycle, due to the impossiblity of setting this time with pinpoint precision. So the next cycle is slightly different from the preceding one. Over a number of cycles, it isn't a success.
I noticed that the trigger switch, when pressed anywhere during the cycle, the motor shuts off. Is it possible to use a micro switch, or something similar to attach to the door frame, so that when the door arrives, the relay shuts off. When the trigger is pressed again, the cycle begins, ends on the door's arrival ?
Thanks again,
Regards,
Gus
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1st February 2021, 02:12 PM #9Senior Member
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Hmm, I guessing that this is geared drive and that if the motor doesn’t cut out the instant the door closes it keeps going past the start location, which gets amplified after each operation.
What your suggesting is a limit switch which could done and you wouldn’t need the timer. The momentary switch in parallel across the normally closed contact of the micro switch then to the motor. With the door closed the actuator on the the door holds the micro switch contact open, hold the start switch until the cycle starts and the micro switch contact is closed, it will then keep running until the door closes again actuating the micro switch contact open. If the switch needs to be held too long to start the sequence then the timer could included in that.
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1st February 2021, 03:30 PM #10Senior Member
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I just drew up my ideas on the back of an envelope, looks like the easiest way would be to parallel the micro switch contact across the relay contacts and shorten the timer to a few seconds.
8F1E3EF5-25B4-43F8-BFE1-5F03D3B95E9E.jpeg
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2nd February 2021, 04:41 PM #11Senior Member
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Thank you very much ! The diagram clears up a question I was about to ask you. I spent the day re working the door actuating mechanism to ensure a solid closing so the blade of the switch can be positively pushed. Now for yet another trip to Jaycar.....
Regards,
Gus
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5th February 2021, 02:20 PM #12Senior Member
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Apple8,
Somehow, probably due to my inattention, I managed to short out the relay. I think you have another method of achieving the cycle using another switching method, is that right ? If so, please advise what that would be.
Thanks very much,
Regards,
Gus
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5th February 2021, 03:57 PM #13Senior Member
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5th February 2021, 04:10 PM #14Senior Member
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Yes, have a meter. The red LED which previously showed the unit is powered is now not lit, so the green, which indicated that it is in operation is not lit. There are no clicks, Why I think I shorted it, is because of the tight space, I inadvertently touched both the terminals of the battery with a screwdriver, resulting in sparks momentarily. After which, the red LED is inoperative.
Thank You for the speedy response !
Gus
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7th February 2021, 09:35 AM #15Senior Member
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Apple8,
I know I am missing something, due to not being experienced in the use of diagrams and descriptions received with grateful thanks from you. However, it is a learning opportunity, and I will persevere with it !
Regards, and thanks again,
Gus
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