> From: Leonardo Marsaglia [mailto:ldmarsag...@gmail.com] > > > > BTW, Here's a link to the video that shows how I screwed up thinking it > > was in position mode and was losing position with higher velocities. > > https://youtu.be/cx-kAqdwceU > > > > When really it was running in velocity mode. > > > So if I understand correctly, these drives have the option of driving them > in velocity mode but with the speed reference being step + dir right? >
Yes. The only reason I have the spindle motor configured as 0-10V + DIR is that using a single parallel port or 7i92H with LinuxCNC means I only have PWM available on one of the pins. Under MACH3 I can select from one of the config screens (no text files to edit) whether I want the two pins to be STEP/DIR or PWM/DIR. So for now to be able to use the dual boot I'm stuck with the PWM to 10V. But really for what I'm doing I don't really care. In the future if once I wire up the second port I can use another StepGen on the 7i92H instead of the PWM and then switch the drive over to steps to create velocity. With a 2500 line encoder x 4 that's 10000 steps per rev. The motor is rated at 3000 RPM or 50 RPS which means 50 x 10000 = 500kHz. The drive can also multiply the step inputs with a n/d scale factor to reduce the number of steps required relative to encoder pulses. The encoder outputs mirrored onto the connector can also be scaled by an n/d pair to reduce the encoder pulse output load on the PC. John > The Yaskawa drive I have in the Mazak for the spindle offers that > possibility and I'm going to use it that way to simplify things with the > boards I'm using. > _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
