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General Mach Discussion / Re: Implementing 3 MPG's one for each of X Y and Z Axis
« on: July 22, 2008, 01:25:56 PM »
Hi Brett. I tried as you suggested. MPG-1 and MPG-2 calibrate OK, but still when I select MPG-3, as soon as I select any of the calibrate functions, the select on MPG-3 is removed, and MPG-2 appears as selected. I am unable to calibrate MPG-3 at all- as below
" Now when I select MPG-3, the select button shows a 'dot' in it, but when I select CAL DETENT, or any of the cal buttons, the MPG-3 button is deselected, and MPG-2
becomes the selected encoder. I seem not to be able to cal MPG-3. However, when in ports n pins I set the Counts/Unit and Velocity values to be the same for MPG-3 as for the pre-calibrated MPG-1 and 2, then MPG-3 drives the axis in the same manner, speed, velocity, etc, as MPG-1 and 2. "
I have also played further with the velocity modes, but perhaps you can explain what the intent is behind these selections. I understand them to be -
in velocity mode - the axis will move according to the rate at which you rotate the MPG, the faster you rotate, the faster the move is, but in a sort of linear fashion.
in velocity/step mode - the axis will move, for example, at rate 1 for a certain MPG rotational speed, then if the MPG turns 10% faster, the axis moves 20% faster, and if the MPG rotates 20% faster, the axis moves 50% faster, or something to that effect.
I find no difference between the two selected modes for different MPG rotational rates.
Thanks again.
JoNo
" Now when I select MPG-3, the select button shows a 'dot' in it, but when I select CAL DETENT, or any of the cal buttons, the MPG-3 button is deselected, and MPG-2
becomes the selected encoder. I seem not to be able to cal MPG-3. However, when in ports n pins I set the Counts/Unit and Velocity values to be the same for MPG-3 as for the pre-calibrated MPG-1 and 2, then MPG-3 drives the axis in the same manner, speed, velocity, etc, as MPG-1 and 2. "
I have also played further with the velocity modes, but perhaps you can explain what the intent is behind these selections. I understand them to be -
in velocity mode - the axis will move according to the rate at which you rotate the MPG, the faster you rotate, the faster the move is, but in a sort of linear fashion.
in velocity/step mode - the axis will move, for example, at rate 1 for a certain MPG rotational speed, then if the MPG turns 10% faster, the axis moves 20% faster, and if the MPG rotates 20% faster, the axis moves 50% faster, or something to that effect.
I find no difference between the two selected modes for different MPG rotational rates.
Thanks again.
JoNo