Electronics > Projects, Designs, and Technical Stuff
Need some help building a circuit involving switchs and relays
Shaydzmi:
OK:
The machine consists of 4 circuits that control:
1-Yarn in.
2-Yarn out.
3- Broken needles.
4- Safety door open.
but in reality they combined the (1-Yarn in) and (2-Yarn out) in one circuit, which is not good, because (2) needs a specific behavior is different than the others.
because of that, I did what I did.
Now you have an answer to this:
--- Quote ---Well, some of this information should have been in the first post.
Your schematic does not show any of this.
--- End quote ---
--- Quote ---Was the goal to switch to current sensing?
--- End quote ---
The goal is to monitor these circuits regardless of the method.
--- Quote ---How are you even sure that there are bulb bypass resistors? What is their value?
--- End quote ---
I saw it, I don't remember its value, it's just above the bulb resistance.
--- Quote ---Why would you think that current monitoring would be more reliable than the existing voltage bus?
--- End quote ---
I don't know, the members who answered my question, suggested that.
--- Quote ---Is there a problem with the existing boards?
--- End quote ---
Yes the part (3- Broken needles) and (4- Safety door open ) doesn't work.
--- Quote ---With the second poles of the thread-out switches?
--- End quote ---
They combined the (1-Yarn in) and (2-Yarn out) in one circuit, I want to separate them.
Shaydzmi:
Correction:
--- Quote from: Renate on May 27, 2020, 04:54:23 pm ---Are you quite sure that the thread-out switches are not actually double pole, DPST?
...
Am I wrong?
--- End quote ---
Every device has 2 separated switches, so we can call them: DPDT.
Renate:
Alright, I think I'm beginning to get a picture.
You've got 84 feeders total, each with an entrance and an exit yarn switch.
The feeder bar cable is a two conductor.
So what you're planning on doing is modifying 84 feeders to split the two switches?
Then what? You've only got two conductors and ground going out.
You could add a second bulb to the feeder (or switch to DC and use diodes).
Then you would have two buses on which you would have to use current detection.
The broken needle detection is simple.
It's just a question of the sensor itself and a latch.
The same goes for cabinet interlock.
Do I have the right picture? Graphic updated to show two bulbs. And yet more modified
Shaydzmi:
--- Quote ---Alright, I think I'm beginning to get a picture.
You've got 84 feeders total, each with an entrance and an exit yarn switch.
The feeder bar cable is a two conductor.
--- End quote ---
Exactly
--- Quote ---So what you're planning on doing is modifying 84 feeders to split the two switches?
Then what? You've only got two conductors and ground going out.
You could add a second bulb to the feeder
--- End quote ---
The feeders already have two switches and two bulbs each, all they did was they merged the two conducting wires to go to the board as one wire, so simply I'm going to separate them.
By the way, how can you achieve that with this? (Just for learning purposes)
--- Quote ---(or switch to DC and use diodes).
--- End quote ---
--- Quote ---Then you would have two buses on which you would have to use current detection.
--- End quote ---
Yep.
--- Quote ---The broken needle detection is simple.
It's just a question of the sensor itself and a latch.
The same goes for cabinet interlock.
--- End quote ---
Yes.
--- Quote ---Do I have the right picture?
--- End quote ---
Yes.
Now, I think it is your turn to give us your ingenious solution!
Renate:
Note: I updated the drawing above.
--- Quote from: Shaydzmi on May 28, 2020, 03:41:01 am ---They merged the two conducting wires to go to the board as one wire, so simply I'm going to separate them.
--- End quote ---
So you want to remove a feeder from a knitting machine, sit down at a bench, open it up, modify the wiring, put it back together and reinstall it 84 times? ???
It's worth that much to you to tell the difference between the yarn being out at the entrance or the exit of the feeder?
You'll end up with a non-standard feeder that could cause a lot of mischief if it were mixed with others.
And then you have to make a new current sensing board.
Is this a project you're doing or is it a machine that is knitting in production right now?
It's going to take you a while to do this.
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