Kind of cool to do an M3 S10 and see the what would be the spindle turning at 10 RPM with STEP/DIR control. (all on my test bench with a smaller motor at the moment and Pi4/7i92H instead of PC/7i92H.
Been working on that all afternoon. Moved controllers around. Moved motors. Nothing. And yet the motor worked fine on the machine and under the Pi4 and 7i92 also ran correctly with PWM/DIR. But not STEP/DIR. Didn't seem to matter what parameters I changed in the servo motor. I'd switch back and forth between the two different .BIT files in the 7i92H. I took a step backward and started cloning the Z axis parameters into the spindle parameter in the INI file. The P parameter was 0.0 Once I set it to 1000.0 spindle stepping worked. Which makes sense. No Proportional Gain, no velocity. MAX_VELOCITY = 50.0 MAX_ACCELERATION = 300.0 P = 1000.0 I = 0.0 D = 0.0 FF0 = 1.0 FF1 = 0.0 FF2 = 0.0 BIAS = 0.0 DEADBAND = 0.0 MAX_OUTPUT = 3000.0 So when controlling an intelligent AC Servo Drive what is an ideal value for P? It's open loop at the moment, until I add an encoder to the spindle. Anything else required to make open loop reliable? Once there's an encoder on the spindle how much tuning is needed given that it's step/dir and not PWM with encoder feedback? Thanks John _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
