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General Mach Discussion / Direction pulse
« on: January 12, 2012, 02:16:22 PM »
I need a little help....
I am wrestling with a problem with my direction pulse.
When I connected my BOB to my stepper drivers no matter how they are connected the motors will not turn under power.
After reading as much as I could find that was relative, I went back to my test setup and checked the outputs.
I have a lovely pulsed output from the step pin, but from what I read I should have a pulse from the direction pin which leads the pulses for the step signal by a time interval.
Well thats as I understood the theory anyway.
What I have got is a pulsed output on the step pin, however the direction pin merely changes from a high to a low state and vice versa on changing the direction of jogging.
Is this correct? If it is not correct how do I adjust the Mach3 settings to produce the required pulse?
If the pulse is not required then do I need to change the wirring to the BOB?
I am a total novice at this, and what does not help is the number of permutations that stepper motors can work with little regard to how to apply it.
Ie. CW/CCW mode step and direction mode, and that you have to wire this gear either pos or negative depending on your breakout board.
I have Totally covered all bases with the wiring, and tried every permutation, yet so far all I am able to achieve is a motor which is held once the power is applied, and so far as I understand or misunderstand am missing a specific pulse on the direction to make it run.
Am I barking up the wrong tree?
One final question for now, the enable input to the stepper drive, is this needed or is it optional? the reason I ask is because all I currently want to do is prove the motors actually work under Mach3, so I can complete the mechanical part of the conversion then faff about with this electronic stuff after the conversion is complete.
Regards
Simon
I am wrestling with a problem with my direction pulse.
When I connected my BOB to my stepper drivers no matter how they are connected the motors will not turn under power.
After reading as much as I could find that was relative, I went back to my test setup and checked the outputs.
I have a lovely pulsed output from the step pin, but from what I read I should have a pulse from the direction pin which leads the pulses for the step signal by a time interval.
Well thats as I understood the theory anyway.
What I have got is a pulsed output on the step pin, however the direction pin merely changes from a high to a low state and vice versa on changing the direction of jogging.
Is this correct? If it is not correct how do I adjust the Mach3 settings to produce the required pulse?
If the pulse is not required then do I need to change the wirring to the BOB?
I am a total novice at this, and what does not help is the number of permutations that stepper motors can work with little regard to how to apply it.
Ie. CW/CCW mode step and direction mode, and that you have to wire this gear either pos or negative depending on your breakout board.
I have Totally covered all bases with the wiring, and tried every permutation, yet so far all I am able to achieve is a motor which is held once the power is applied, and so far as I understand or misunderstand am missing a specific pulse on the direction to make it run.
Am I barking up the wrong tree?
One final question for now, the enable input to the stepper drive, is this needed or is it optional? the reason I ask is because all I currently want to do is prove the motors actually work under Mach3, so I can complete the mechanical part of the conversion then faff about with this electronic stuff after the conversion is complete.
Regards
Simon