Perhaps the TS wants to control a hoist.
Then momentairy buttons can be usefull.
I want the motor to go up when the “UP” momentary switch is depressed and stop when it hits the “UP” limit switch.
I want the motor to go down when the “DOWN” momentary switch is depressed and stop when it hits the “DOWN” limit switch.
Gee, that’s what I’ve been saying in several posts..Hello,
This is the text from the PDF:
I WANT TO CONTROL THE FORWARD AND REVERSE ON A 12 Vdc MOTOR.
I WANT THE MOTOR TO GO UP WHEN THE "UP" MOMENTARY SWITCH IS DEPRESSED AND STOP WHEN IT HITS THE "UP" LIMIT SWITCH.
I WANT THE MOTOR TO GO DOWN WHEN THE "DOWN" MOMENTARY SWITCH IS DEPRESSED AND STOP WHEN IT HITS THE "DOWN" LIMIT SWITCH.
ADDITIONALLY I WANT AN ON/OFF SWITCH FOR THE SYSTEM POWER.
BELOW ARE MY THOUGHTS BUT IT IS INCOMPLETE.
It looks like he wants to start the movement with momentairy buttons until the limit switches.
You’re assuming push button causes movement only while it depressed, because of your experience. I see the push button “initiating” an action and the limit switch “stopping” the action. Again, that’s my personal experience. I’ve designed more circuits for that application.I see only one momentary switch. He DID state that he's trying to START a drawing but doesn't clearly know all he needs. That's why he's asking for help. Again, push button suggests movement only during the pressing of the button. I'm in the process of planning a sled that will lift and lower wood products from the driveway up to the second floor over the garage. I'll need something I can operate a short distance or to full limit but not beyond limits. Toggle switches can get triggered by accident. Then my sled will move to limit. And if someone or something is in the way - - - . Hence, a push button commands human control over the process. And the design needs to be robust enough to not short or weld contacts together. The plan I drew this morning I have saved. It'll probably be something along these lines, however, with a much heavier motor, supply and relays. The switches can remain small. AND I can have the same set of switches upstairs and down stairs at the same time so I can control the sled from ground level or from the second floor.
So this is why I'm assuming the TS wants to be able to stop mid way. Boy it sure would be nice if the TS could just clarify that one detail. For now all WE can do is assume (and possibly argue intent) what the TS wants.
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by Robert Keim