For some reason I cannot explain, I started having a problem with homing today. Most of the time, it works correctly, but several times today it would start to home the Y axis, and as soon as it hits the home/limit switch, it stops, flags the limit switch triggered, and stops dead in its tracks. When I try to manually clear the limit error and back out, I can clear the error, but the instant I hit reset, it re-asserts the limit error, and I am unable to back off the limit. I could find nothing to get me going again other than killing and re-starting Mach3, whereupon it works correctly. When Mach3 comes up the second time, it flags "Driver Watchdog Triggered". It seems like something in Mach3 is getting whacked, because even if I power down the servos and manually back off the limit, it will just do the same thing again until I restart Mach3.
Why is this happening, and why did it just start today? It's been working correctly for several weeks, and I've changed nothing in Mach or the limit/home hardware. I have one set of switches, wired in series, for both home and limit on both X and Y. It happened to me at least 6 times today.
Regards,
Ray L.