This system has had occasional issues with stopping randomly while running code in the past - but it was very intermittent and did not impact many jobs.

Recently the system was moved, and the cabling has been moved.


Now - as soon as you engage the spindle (even if not running code) it shuts off randomly, before even reaching full spindle speed.


When it happens, program execution is stopped and spindle is shut off - but the software still communicates with the controller. I can immediately click the spindle button and re-start the spindle (only to shut off seconds later).

As the cabling has been moved, I suspect this is some sort of a noise issue - but as I'm seeing no errors, disconnections, or tripped E-Stop/limit... I have no idea exactly what is the culprit, although I'm sure it's related to the spindle/VFD.



Which controller do you use? MK 3/4
Are your motor cables shielded? Yes
Do you use external power supply for controller? Yes
Do you use double-shielded USB cable? Yes. A 3' Tripp Lite
double-shielded USB 2.0 cable with ferrite chokes