It's been a harrowing two days after catastrophic failure of a rather old PC PSU (of the Mach 3, not LinuxCNC host) generated sufficient mains transient to cause subsequent failure of two low power transformers (one open circuit, the other flashing over at primary line voltage despite normal winding resistance!) within 4 - 6 hours of control unit operation under LinuxCNC, as we pursued debugging of anomalies experienced.
So while the growling of input-strapped stepper-drivers cannot conclusively be attributed to stepper PSU stress, we now have a control system with more than ample PSU headroom! Having applied halscope to the system without encountering any anomalies, a small mechanical design mod for gantry drives overcomes the racking (while still achieving original design objective). The shortcoming is attributable to system (mechanical) dynamics. This has all been under conditions of normal machine operating parameters, as well as inordinately fast jogging. Nevertheless, we need still to explain the entirely repeatable time lag between startup of Y & A joints with unusually small acceleration parameters, with further halscope study when time allows. Thanks to all who have contributed to the analysis of the past week, we shall endeavour to be of similar help to the community now that we have learned much of LinuxCNC (as well as the well-integrated Mesa subsystems)! Hugh Wylie ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
