Has anyone setup Mach3 to control a Hitachi SJ series VFD using modbus?
It looks like it should be possible, the basic setup using autopolling is covered in the wiki. I can pretty much understand mapping the Run, FW/REV functions to virtual pins in Mach.
What I don't understand is how to map the spindle speed. The VFD has a holding register that sets the drive frequency with an input value of 0-4000. Can this be used to set the drive speed? How would it work?
ALso, there is another holding register that displays the output current that the drive is delivering. Is it possible to display this value on the Mach3 screen, and/or scale it before it gets displayed? This would allow me to have have a spindle 'load meter' showing the electrical current being pulled by the motor.