Auto reversing linear actuator Part 2
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- เผยแพร่เมื่อ 2 ต.ค. 2024
- Auto reversing linear actuator with hard wired logic using a DC gear motor, relays, limit switches and a counter with no programmable logic controllers (PLC) or smart motors (stepper with integrated driver/controller.
This system used a DC gear motor to power a screw drive linear actuator, 2 limit switches (1NO and 1NC), 2 DPDT relays (1 as a latch and 1 as a voltage reverser).
It will run continuously back and forth until the counter reached its preset limit.
Hey it's me again. One of your viewers came to my channel asking for help with the simple Forward/Reverse part of your video. After I made some diagrams and videos it got me to revisit you video. I wanted to recreate the work (at least on paper, foreshits and giggles) I made a working circuit. Then I noticed your whiteboard picture. I get most of what is going on but I can't seem to make out the connections to the Counter. Would you mind breaking down what goes to what in a drawing or text? Also the use of diode and resistor? I have a diagram done for the most part. Just need some clarity.
Please can I get a parts list and wiring diagram, so that I can make this mechanism. If you can help me out it be a appreciated.
Contact me at info@engr-group.com
Sir please share dc motor details.
It's a 12VDC motor with a multi-start lead screw I picked up at a surplus supply house years ago. Similar to this one: www.mpja.com/Leadscrew-with-Gearhead-12-24VDC-Motor/productinfo/32681+MD/ . Speed control was a PWM drive similar to this ( www.mpja.com/PWM-DC-Motor-Speed-Control-6V-24V/productinfo/36113+MD/ )
@@ERGMIAMI thanks a lot and lots of love.
What counter model are you using for the diagram and, if different, for the end product?
That counter is no longer available. Here is its replacement: automation.omron.com/en/us/products/family/h7cc
@@ERGMIAMI OK well what I am trying to do is study the circuit. However when it comes to the counter (diagram is unclear) what goes to what. I can speculate but without knowing the exact model (link is to the series not one that you used) it is hard to do that. Since each model in the series can be different in how the operate and pinouts are different. So it is difficult to ascertain why you have a diode and resistor. It seems that they don't have a purpose. Being that there is positive voltage coming through the relay and on most counters the Count terminal is High and it is trigger by going to LOW. AKA the negative. What is the thought process? Is the blue line at connection 10 an acualt wire also?
@@AztecWarrior69_69 The input to the counter is connected to the leg of the limit switch that goes high when the carriage is at that limit switch. That increments the counter's PNP (Sourcing) input. The output of the counter that closes (Normally Open output) when the counter is powered, supplies power to the motor circuit. That is, the output COM terminal is connected to the +V power supply and the NO terminal is connected to the motor speed control Power Input. That output changes state to off when the preset count is reached, shutting off power to the motor circuit and stopping the carriage.
The system restarts when the counter is RESET with a momentary switch bridging the reset terminal with +V (or 0V depending on the counter)
@@ERGMIAMI Ok Now I am confused.
On your whiteboard drawing you have.
and on my drawing recreation of it.
Left a link to it but is seems to have disappeared along with the comment it was in. Guess youtube doesn't like external links. Will leave a link to it in my latest video here.
Will link in next comment just in case. (If you don't mind taking a look and confirming)
Negative from battery to
P1 5 NC
P1 6 COM
TO
P2 8 COM
Makes connection to
P2 7 NO
TO
Counter 9 and relay coil negative.
If I am not mistaken that means the connection on CTR 9 is brought LOW not HIGH. Otherwise the relay won't energize.
I still am not getting what the diode and resistor are for. On All my counters the input (COUNT) is HIGh and it needs to be brought LOW to trigger the increment/decrement.
Are they to protect from EMF.
"The output of the counter that closes (Normally Open output) when the counter is powered, supplies power to the motor circuit. That is, the output COM terminal is connected to the +V power supply and the NO terminal is connected to the motor speed control Power Input."
What you are saying that when the counter reaches the set count. the counter OUTPUT (OUT) goes to NO making a connection to Negative and keeping it (sos relay stays energized), when P1 is NO. AKA bypassing P1.
Yes I got that. It was hard to tell in your whiteboard diagram. But I figured as much.
@@ERGMIAMI th-cam.com/video/g0cIVGC6jD4/w-d-xo.html
Hi can you shear diagram this circuit without counter
I have this preserved on a whiteboard drive.google.com/file/d/1YeISpvzFgmINLpE_DyQx2ffId6DtOuSb/view?usp=sharing and this is the final project video th-cam.com/video/vDnQe7CV3QQ/w-d-xo.html if you need more info contact me through the website on the video
www.engr-group.com