Don Stanley wrote: > The 5-8 switches are up (ON) for servo and non servo. My micro stepping > Drivers only need more steps with direction to do the micro step moves. > > Sorry, you are right. These switches operate opposite of what they should, switch ON means function "OFF" in many cases, and I constantly confuse myself - no telling how much this confuses anyone else! So, you've got it right, switches 5-10 should all be on, normally.
So, you turn switch 1 off, for instance, and everything works, you flip switch 1 on and you get no motion? That seems very strange. Do you get whistles from the motor? One possibility is you are having such an instant servo runaway that the motor never even appears to move. You may need to look at the velocity command going to the step generator with Halscope to see what is going on. The signal to examine is ppmc.0.stepgen.00.velocity if it is going to large values when you try to move, that is a sign of a servo runaway. In a real servo system, this would cause rapid acceleration of the motor, but a stepper can stall quickly if commanded to accelerate wildly. You might fix this by reversing the sign of either INPUT_SCALE or OUTPUT_SCALE. > With my Step and Direction micro stepper Drivers, my switch configuration is > all switches ON (UP) except switch 4 OFF for the A axis, in non servo mode. > Do I need to change this? > > Is it possible the USC requires switches 5-7 OFF (DOWN) to produce output > when switches 1-3 are ON for servo mode ? > > No. Switches 5-8 set individual axes to quadrature (wave drive) waveforms. Unless your drives use this drive scheme, you do not want to flip these switches, you want to leave them ON for step/direction output. Switch 9 is "Mariss mode" to only change direction immediately before the next step pulse, as was required by the very early Gecko drives with the G901 step multiplier. With switch 9 ON, then the direction changes immediately when the EMC2 driver gives the command to change direction, unless it is too close in time to a step pulse. Jon ------------------------------------------------------------------------------ Increase Visibility of Your 3D Game App & Earn a Chance To Win $500! Tap into the largest installed PC base & get more eyes on your game by optimizing for Intel(R) Graphics Technology. Get started today with the Intel(R) Software Partner Program. Five $500 cash prizes are up for grabs. http://p.sf.net/sfu/intelisp-dev2dev _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
