Need Wiring Help For 12 Volt Motor

Gallery, Projects and General > How do I??

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vtsteam:
Darn, Snub, I finally had an idea that I think would work very easily and straightforward. I could draw it up quickly with those sticks.

Instead of one stick for direction, and one stick for speed, we could make one stick for high speed, and one for low. Direction could be set by either stick -- forward for forward, back for reverse. Both sticks in neutral would be motor off. This would require only your two relays. The slow stick would detent in either forward or reverse.

If you wanted to add another axis, all functions would be the same for that axis as well, so it would work perfectly for a 4 direction joystick. One stick would be fast traverse for both axes, and the other would be slow for cutting for both axes. Very simple to set up and the circuit diagram would be symmetrical.

Your problem in the past was due to the motors acting as generators before they stopped when you reversed direction -- that increased the current momentarily, blowing the fuse. You might get by with a slo-blo type fuse if the current spike isn't too great. Also with a center off position, you might get a little more time for a slowdown before reversing.

The reason the LED glowed after it was turned off was unrelated -- there was just probably a capacitor in the circuit wth the LED, and it needed to discharge completely before the LED stopped glowing.

snub:

--- Quote ---Instead of one stick for direction, and one stick for speed, we could make one stick for high speed, and one for low. Direction could be set by either stick -- forward for forward, back for reverse. Both sticks in neutral would be motor off. This would require only your two relays. The slow stick would detent in either forward or reverse.

--- End quote ---

That is exactly how I had envisioned it working. I know now that I hadn't explained it properly in my first post. Either that or we need a USA/ Canada translator. Living in Vermont you are not far from Canada but I know your immediate neighbours to the north don't speak the same language.

The problem I am having is converting your schematics in to actual wiring hookups. All is good except for the relays. My scanner is still on the fritz so I can't show you what I came up with, but here is a picture of how I drew up the wiring diagram when I motorized my lathe. Works perfect.

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bertie_bassett:
well iv had another quick go at a possible solution and have come up with the following:

the latching joystick sets thing in motion at slow speed, and the momentary will bypass the pwm for full speed.

if the momentary joystick is used on its own, nothing will happen.

not quite what you were after but it might do you?

two things to note though, iv common'd up the pwm -ve with the supply -ve, and in fast mode 12v is supplied to the motor and the + output of the pwm modual. i dont think either of these will be a problem, but without the part in my hand i cant be sure

vtsteam:
Bertie, hard to read as drawn, but looks like in the state you show your circuit you have PWM + going to both sides of the motor. Haven't checked anything else.....

snub, sorry about my own mistakes in reading your first post. I'll try my hand at a drawing one more time and post something (I hope) tonight. I'll try to make it more like your drawing and less like a schematic, if I can.

vtsteam:
snub, okay I worked out a circuit. It is for only one of the joysticks, and one of the relays just to make it easier to understand.
The other one would be identical except it would also include the PWM in the circuit. The one I'm showing here would be the fast speed Joystick and relay. I'm going to show it first as a schematic, and later try to do a block wiring diagram like you showed.

But I'm hoping that you will be able to "get" what's happening here first, since if you have the concept, it will be easy for you to draw out your own diagram.

First, here is the schematic (I'll explain it next post):

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