Adjustable 12 V DC Timer Relay Wiring

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28th January 2021, 02:18 PM
xpro

3 Attachment(s)

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
28th January 2021, 03:29 PM
apple8

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
28th January 2021, 04:50 PM
BobL

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.
28th January 2021, 06:29 PM
xpro

Thanks very much for the speedy reply !
Just to clarify, the bridge numbers are different, but so long as I change them, that's ok
T1 isn't really needed for my application
Appreciated,
Gus

Quote:

Originally Posted by apple8

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
28th January 2021, 07:15 PM
apple8

Quote:

Originally Posted by xpro

Thanks very much for the speedy reply !
Just to clarify, the bridge numbers are different, but so long as I change them, that's ok
T1 isn't really needed for my application
Appreciated,
Gus

From the pictures I see what you mean, from what I can see you want both jumpers closest to the centre of the board for your application of an "only run once for X seconds when I press the button". (that assuming I can read Chinese which I can't.) :D
29th January 2021, 07:52 AM
xpro

Quote:

Originally Posted by BobL

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.

Thanks Bob,
Do I understand correctly ?
The relay receives power from the battery for its operation, outputs only one phase, + to the motor. The negative is connected directly.

Regards,
Gus
29th January 2021, 08:44 AM
BobL

:2tsup:
1st February 2021, 11:21 AM
xpro

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
1st February 2021, 02:12 PM
apple8

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.
1st February 2021, 03:30 PM
apple8

1 Attachment(s)

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.

Attachment 488951
2nd February 2021, 04:41 PM
xpro

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
5th February 2021, 02:20 PM
xpro

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
5th February 2021, 03:57 PM
apple8

Quote:

Originally Posted by xpro

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

The diagram on the left hand side of the envelope doesn’t need the timer module. The operation will be as described before.

With regards to the relay what are the symptoms in regards to the LED lights and relay clicks. Do you have a meter to measure any voltages etc.
5th February 2021, 04:10 PM
xpro

Quote:

Originally Posted by apple8

The diagram on the left hand side of the envelope doesn’t need the timer module. The operation will be as described before.

With regards to the relay what are the symptoms in regards to the LED lights and relay clicks. Do you have a meter to measure any voltages etc.

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
7th February 2021, 09:35 AM
xpro

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
7th February 2021, 03:32 PM
apple8

1 Attachment(s)

What are the symptoms. Does this help? Is the switch positioned so the door closed pushes the lever.

Attachment 489238
7th February 2021, 05:43 PM
xpro

Quote:

Originally Posted by apple8

What are the symptoms. Does this help? Is the switch positioned so the door closed pushes the lever.

Attachment 489238

That is very clear, thanks very much. Will be trying that tomorrow. I have removed the not working timer unit.

Regards,
Gus
8th February 2021, 10:08 AM
xpro

The micro switch interrupts the power to the motor once the door arrives. Would you please
show how to start the cycle again ?

Thank you,
Regards,
Gus
8th February 2021, 11:40 AM
xpro

apple8,
I have been experimenting. Using a general purpose relay, wiring its NO output to the motor, found that by wiring a momentary push switch to the +, pushing it starts the door movement, releases the micro switch blade. That in turn disconnects the motor once the door arrives. This seems to work well.
Do you see a possible problem ?

Thank you,
Regards,
Gus
8th February 2021, 11:40 AM
apple8

Hold down the momentary switch until it starts moving and the micro switch operates. That circuit only works for one cycle each time the button is pressed. If you want multiple cycles swap the momentary action button for an on/off switch, with the switch on it will keep cycling until turned off and then finish the cycle when the door closes.
8th February 2021, 02:37 PM
apple8

Quote:

Originally Posted by xpro

apple8,
I have been experimenting. Using a general purpose relay, wiring its NO output to the motor, found that by wiring a momentary push switch to the +, pushing it starts the door movement, releases the micro switch blade. That in turn disconnects the motor once the door arrives. This seems to work well.
Do you see a possible problem ?

Thank you,
Regards,
Gus

That should work, in essence the relay is taking place of the switch and there is a slight delay as the relay de-energises which sounds like it is enough to get it moving enough to allow the micro switch contact to take over.