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Triac Lynx SM 16 - 0 - 10V connections? Is it C11? Thanks Roy. I've soldered two cables onto the back of the motherboard see photo's 2 and 3. On photo 2 I've removed z axis driver card.
This can be repeated for the other axis. I then powered up my machine and using a 5vdc power supply touched on pin2 on my 25D connector the motor pulsed one step then I added 5vdc to both pins motor moved in reverse. I keep on playing around and in the end nothing was happening. I maybe have fried the transistors I got the motor moving again by touching 5vdc directly to the cable's I soldered onto the motherboard. I've just ordered a C11 board from cnc4pc. I did not connect it to my pc and test with Mach, I'll wait for the new breakout board as this is opto isolated.
I've soldered step and dir cable's on to the back of the motherboard which are connected to the homemade voltage amplifier circuit, which is then connected to the BOB. Well how did I get on, The first time I switched on the motors they were jumping around and slowly creeping.
Turned off and on machine control and this time motors quiet and no jumping or creeping. I tried to move the motors under mach I got nothing on x and y but I did get movement on z but only in the minus direction. I couldn't tune the motors, no matter what setting I tried the motor only turned slowly. I have asked on yahoo answers about the voltage amplifier circuit and they have replied quoting that the circuit is too simple and would not amplify 5v up to 12v. I think this is my sticking point if anyone can help with this issue I would be grateful.
Post by Roy » Tue 04 Nov , am Hi Dale, The drive board should work ok, providing you have it wired correctly. Mine works great on my triac with digiplan drives and the same breakout board as you. Just looking at your board you may have it correct but i can't see it well enough. The ground pin on the transistor should be the right hand one if looking at the transistors flat face.
To get my steppers to run smooth I had the dir active low and step active low turnt off, and motor tuning with steps. Cheers Roy. Post by cncbasher » Tue 04 Nov , am to move using the step and direction pins , u need to pulse the step pin each pulse of 5v will step the motor one step , so holding the 5v will not make the motor rotate continously , just quickly touch it on and off will do the trick.
Post by SimonRafferty » Tue 04 Nov , am I think before you go any further, you need to find out what is actually happening! Disconnect your transistor drivers from one step and direction input. Then measure the voltage between the step input pin and ground, and again for the direction with the stepper driver powered up. It should read somewhere between 6v and 12v - so long as it doesn't read 0v - then the above circuit should work.
Since you mentioned that the motors are 'jumping around, it means that noise is activating the step and direction inputs. To me, that would indicate that the input is 'floating' - not connected specifically to 12v or 0v - but allowed to float in the middle somewhere.
If it sits at less than 6v, it needs to be pulled up closer to 12v. To do this, connect a resistor the value of which doesn't matter too much - somewhere between 1k and 3. Measure the voltage again - and it should be on the right side of 6v between 6v and 12v. The transistor amplifier described above 'pulls down' the input to somewhere close to 0v - and can only work if there is something else pulling it up to 12v the rest of the time - hence the resistor. With the resistor connected, your noise problem should vanish and the motor should step when the input is touched on the 0v line.
Next, without the BOB output connected, try touching the input of the step transistor amplifier the 3. It should step the motor. If it does not, check your wiring. It may be that you've blown the transistor or connected it up wrongly. Next set one of the BOB outputs high a dir output is easiest as it will stay high or low when you change direction. Test it with a meter to make sure it is sitting at between 3 and 5v.
Try touching the step input on the transistor amp to this line. If it does not, it may be that it does not spit out enough current to drive the transistor through the 3. You may need to reduce the value of the 3. I found mine was most happy at between 1k and 2. In summary, go through the whole interface one thing at a time. At the point it appears not to work - there is your problem.
Let us know how you get on and I'll try to be more specific about what might help! Roy I do have the ground pin as you pointed out thanks. Simon I disconnected transistor circuit form BOB and measured voltage on all drives both step and dir and the reading range from I've then connect up x axis to BOB, motor is quite when dir is active high but when I change dir 0v motor is noisy and stays nosey until I change dir active high again.
When I check then volts the collector end of transistor on dir I'm getting 8. I've uploaded a wiring diagram of the transistor circuit I've made to see if it's correct. Is this transistor circuit acting as a switch to alter 12v to 0v from motherboard when receiving 5v from BOB? Hope this information can help with tracing my problems. Is it possible that the step output is pulsing switching on and off v.
A transistor behaves a bit like a dimmer switch on a ceiling light where the knob it 'turned' by the current flowing from the base connection to ground. The virtual ceiling light is connected between 12v and the collector.
Transistors have an associated gain - which means that the amount the 'knob' is turned for a given current flowing between the base and emitter.
I would try changing the 3k resistor for a lower value. That will allow more current to flow from the base to emitter - which in turn allows more current to flow between the collector and emitter.
Try 2. The transistors you are using are BCC which quote a gain of This means that, with a 3. Try connecting your meter, set to mA between one of the step inputs and 0v - this will give an indication of how much current needs to flow through the transistor to operate the board.
Let us know the result. I have uploaded a new photo of the alterations to my circuit board I added two wiper resistors to find the best resistance, I adjusted to 2k to start with, I switched on machine not much difference adjusted down to 1k and x axis moved in one direction but I also noticed z axis was moving at the same time but the z cables were not connected to the BOB.
So I connected the z axis cables to the BOB and I got movement in both directions on z axis movement is slow and does not responded to motor tuning I then moved the earth from the emitter on the transistor circuit from BOB pin 15 to machine cabinet and I got movement on x axis in both directions.
I'll upload a photo of the back of my transistor circuit which shows how I connected all the emitter side of the transistor together which I connected to pin 15 on BOB but then I moved it to the machine cabinet. Is this incorrect? I tried moving emitter side of the transistor to different earths which did have an inpact on noise. After a stressful three weeks the Motors are zipping along except y but I think thats just a bad connection on my transistor board.
Only had a small amount of time to play with the tuning. Big thanks to simon and everybody else who contributed. It's a good feeling isn't it!
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