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. I can run the X-axis (up and down) at 60 in/min with no problem. I cannot run the Z-axis motor more than about 39 in/min or it will stall as in the video. I can run it in very short bursts above 39 in/min but only 2-3 seconds before it will stall. At 39 in/min and below it runs beautifully and it seems to have fine holding torque (can’t turn it with my hands anyway). I believe I have Linuxcnc set up correctly, the motor moves the distance that it should so scaling is right, and I have played with the step space/length parameters thinking that maybe I had them set too high to no avail. I have step space and step length set to 5000 each but I have tried 4000 and 6000, neither of which made any difference to either axis. I have setup and hold set to 5000 each (and have tried as high as 10000). The manual for the UDX5128NA step parameter is shown below (inline jpeg). The UDX5128NA can supply 2.8A max (motor max is 2.7A) and I have both drives configured for max current output. I am at a loss as to what might be causing this since I have everything set identically on the two axes, x works great, z works great only below 39 in/min. -Tom ------------------------------------------------------------------------------ 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
