Electronics > Beginners
Simple motor control.
moontide:
So I'm a beginner and need a specific problem solved.
I work with a conveyor system and have some basic logic control requirements....
PLEASE HELP!!!!
Problem:
Boxes often get jammed on a section of conveyor.
The motor does not stop so sinks and shit fall about 20ft onto an area where people may be.
Theory:
I figure put a photoeye in that area and have it control the motor. If the boxes stay there too long the motor shuts off. (Warning light would be nice too) On startup it should be allowed to run for an adjustable amount of time. (Ideally 5-10 seconds). I can patch into a run signal when the motor would begin.
I'm good at soldering and have a head on my shoulders but frankly I'm 1st year industrial tech and the company who installed it can't seem to be able to install a guard requiring no tools. So alone, lol.
I watch Dave a lot but I'm only getting pieces.
Motor: 3phase 480 ac
Run signal 120v dc
Photo eye 24 vdc (PNP or npn)
Its hard for me to get the inicial run vs normal run.....
This problem made me wonder if there is an inductor with 4 contacts... Basically a transformer but an inductor that only passes a voltange threshold....
I call it transformative inductor.... Lol.
Mechatrommer:
--- Quote from: moontide on October 02, 2018, 05:33:44 am ---I figure put a photoeye in that area and have it control the motor. If the boxes stay there too long the motor shuts off. (Warning light would be nice too) On startup it should be allowed to run for an adjustable amount of time. (Ideally 5-10 seconds). I can patch into a run signal when the motor would begin.
--- End quote ---
you have few options..
1) infrared sensor measuring distance to object from one end of conveyor.
2) array of photodiode + infrared sensors on conveyor's side.
3) array of weight sensors underside of conveyor.
4) motor current spike circuit.
5) AI camera
not sure what you can control and how the conveyor looks like.. so..
IconicPCB:
And yet another option.
A timer whihc gets to shut the line down if there are no boxes moving and allowing the light beam to be un interrupted.
More simply a timer whihc gets held at zero while beam is not broken.
Once the boxes pile up and stop moving beam is continually interrupted , timer times out and stops motor.
All done with off the shelf Sick or similar modules.
moontide:
I'm all about the timer option but really don't know how to make it work.
I find it hard to do a timer when it needs to run initially for 5-10 seconds regardless of photoeye.
But thx for quick feedback!
moontide:
Its like you have the run signal, but then you have to get rid of it....
I'm going circuit level......
Navigation
[0] Message Index
[#] Next page
Go to full version