Jon Elson wrote: > sam sokolik wrote: > >>The cnczone link tom posted is what I have been working on. The >>current schem/pictures are here >>http://www.electronicsam.com/images/KandT/servostart/schem/latestcurrentlimit/ >>use at your own risk :) >> >>It might be overkill for your application but might give you some >>ideas. The input is PWM/PWM (sending pwm in one input is cw - sending >>pwm in the other input is ccw) (plus an enable). I have run this >>directly from the printer port but am using the pluto for faster encoder >>counting when using it to run closed loop (servo). It has been lightly >>tested up to 22a 180v. (the limit right now is the boot strap diodes >>are only rated for 200v). For my app that should be fine as 150-160v is >>where my servos max out. >> > > It would be quite easy to set up appropriate gates to deliver this dual > PWM signal from my > Universal PWM Controller. You can set it for whatever PWM frequency you > like (I use 50 KHz > with my own servo amps). My PWM controller puts out PWM and direction > (kind of a sign-magnitude > thing), but a single gate package like the 74HC00 could be wired up to > convert from that to what your drive > wants. I mention this in case others might want to try out your amp and > have trouble with the Pluto. > > Jon
And this dovetails with my thought of reusing the DC spindle motor on my CHNC Hardinge. Sam and Jon could this be done and not have to worry about a sag in the spindle speed at load? Reuse means not having to buy a VFD or change the motor mounts. Ed. ------------------------------------------------------------------------------ Register Now for Creativity and Technology (CaT), June 3rd, NYC. CaT is a gathering of tech-side developers & brand creativity professionals. Meet the minds behind Google Creative Lab, Visual Complexity, Processing, & iPhoneDevCamp as they present alongside digital heavyweights like Barbarian Group, R/GA, & Big Spaceship. http://p.sf.net/sfu/creativitycat-com _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
