Mach 2 / 3 VFD Spindle control

[JpBinc]

Hello all
Can anyone tell me where I can find a good schematic of a vfd spindle speed interface controler for Mach 2 or 3. I have converted an X3 to a belt drive ac motor and this is the last part of the conversion. Now I know you can buy them but am kinda a homebrewer. I have burned quite a few boards with pics, dac's and adc's etc.. but am not sure how to go about converting the digital io's / pwm to my hitachi sj200 vfd. It looks like there are two different methods for controling output speed/freq. 0 to 9.8 volts @ 10k or 4 to 19.6ma @ 250 ohm. Since I am not use to working with variable current designs. I think that the variable voltage route is the way to go, but I am open to any suggestions. Maybe even a microchip pic pwm capture and compare to dac would work. Any ideas...
Thanks
JpBinc

Mills specs...
X3 cnc'd, steppers, closed loop, ballscrews, gecko's, converted to belt drive spindle 3 phase 1.5hp metric 4 pole motor. 480ipm xy 300ipm z

[Guldberg]

Just by change you change your mind

http://homanndesigns.com/store/index...products_id=38

22$ isnt alot of money

[JpBinc]

After 3 months of designing and testing..... Your point is well taken! The only thing I didn't like about it is the resolution. Rpm / steps Not bad just not as fine as I would like.