On 05/04/2015 06:45 PM, Tom Easterday wrote: > What could cause this behavior? https://youtu.be/GWV9Px6lITM > <https://youtu.be/GWV9Px6lITM> (or https://youtu.be/dXcmpG2MLkk > <https://youtu.be/dXcmpG2MLkk>) > > Some background: > This is a Berger Lahr 596 5-phase stepper motor on the Z-axis of an EMCO 120P > lathe. It, and it’s X-axis identical mate, are driven by a pair of > identically configured Vexta UDX5128NA stepper drivers. Mesa 5i25/7i85s is > supplying step/direction, set to step_type=0 and control-type=1. The machine > (with these original motors) is spec’d at ~80 in/min rapids (different > controls obviously). I am attempting just 60 in/min. > > Well, the audio sounds like a classic stepper stall. Have you tried swapping the drives? The fact that it ONLY stalls after several seconds of running is rather suspicious. I would think it would be most likely to stall just as it reaches the commanded speed, where the combination of acceleration and speed would put the worst load on the motor.
First, take the belt off and see if there is any friction or tight spots in the travel. If nothing is found by swapping drivers and there is no unusual friction, then I'd recommend swapping the motor. Since this system is not working up to the rated performance, SOMETHING must have gone bad. The Mesa controller should be providing smooth trains of step pulses, so the ragged step timing sometimes seen with software stepping is not the cause. Jon ------------------------------------------------------------------------------ One dashboard for servers and applications across Physical-Virtual-Cloud Widest out-of-the-box monitoring support with 50+ applications Performance metrics, stats and reports that give you Actionable Insights Deep dive visibility with transaction tracing using APM Insight. http://ad.doubleclick.net/ddm/clk/290420510;117567292;y _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
