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The 24V passes through the relay. It is connected to the common terminal of the screw blocks.
Relay board connection
- Thread starter champ1
- Start date
Where to connect the positive end of motor It should be connect to the NO of Relay but I don't understand which is NO and NC
Raymond Genovese
- Joined Mar 5, 2016
- 1,653
I would strongly advise you to read a tutorial on relays and the Arduino so you can gain a better idea of what you are doing rather than a paint-by-the-numbers approach, which can, indeed, lead to some sparks and unsafe situations.
Without connecting it up, how do you think it should be connected and why?
I have been connected relay. I have a problem with this specific board.
Raymond Genovese
- Joined Mar 5, 2016
- 1,653
So, in your case, what gets connected to the NC, C and NO contacts on the board?
The contacts where K1 is showing is acting solely like a switch.
Try hooking up the red wire from K1 on the relay board to + 24v. Take the blue wire from K1 on the relay board and connect it to the red wire on the motor. The black wire from the motor goes directly to ground terminal on power supply. Activate board and see if it works.
DO NOT HOOK THE RED AND BLACK WIRES TO THE RELAY. Hook (most likely) only the red wire. (see below)
There are four ways you can wire this. One will work the way you want, one will work the opposite of the way you want it to, one way will do nothing and one way will blow up your power supply. The way you blow up your power supply is to hook both the red and black wires to the relay. That's a HUGE mistake.
The relay is merely a switch. As you can see in the drawing below there is one terminal that is a common terminal. The red wire (calling it red to represent the positive side of your supply; can be any color - color doesn't change the way the circuit works) - - - One of the red wires must be connected to the C (common) terminal. The other red wire must be connected to either the NC or the NO - depending on how you want it to work. If you connect the red wires to the NC and the NO then nothing will happen. It's OK to experiment with the connections until you find what works for you. The ONLY thing you DON'T want to do is connect the black wire to the relay along with the red. If you get the switching wrong you'll short out your supply and possibly damage it. So don't do that.
Keep in mind the illustration of the relay itself MAY be incorrect. Either the center post is the common (as shown) OR the left post may be the common. In either case, the right post is likely the NO contact.
Hope this helps.
There are four ways you can wire this. One will work the way you want, one will work the opposite of the way you want it to, one way will do nothing and one way will blow up your power supply. The way you blow up your power supply is to hook both the red and black wires to the relay. That's a HUGE mistake.
The relay is merely a switch. As you can see in the drawing below there is one terminal that is a common terminal. The red wire (calling it red to represent the positive side of your supply; can be any color - color doesn't change the way the circuit works) - - - One of the red wires must be connected to the C (common) terminal. The other red wire must be connected to either the NC or the NO - depending on how you want it to work. If you connect the red wires to the NC and the NO then nothing will happen. It's OK to experiment with the connections until you find what works for you. The ONLY thing you DON'T want to do is connect the black wire to the relay along with the red. If you get the switching wrong you'll short out your supply and possibly damage it. So don't do that.
Keep in mind the illustration of the relay itself MAY be incorrect. Either the center post is the common (as shown) OR the left post may be the common. In either case, the right post is likely the NO contact.
Hope this helps.
Last edited:
KeithWalker
- Joined Jul 10, 2017
- 3,607
Connect the negative of the 24 V supply to the negative of the load.
Connect the positive of the 24 V supply to the relay contact C and the positive of the load to the normally open (NO) relay contact.
When the relay closes it will complete the circuit and the load will be powered on,
