Hi Ken,
Why would this happen now after 3 days of working fine?Huh?
Something has changed. The problem is that your machine is wherever you are and we are elsewhere. You are going to have to dig in
and find it.
I suspect the problem comes about because you have home switches and limit switches doing double duty. I realize that using a UC100
you have to combine them because you don't have enough inputs. If you had say, a UC300, which has many many inputs you wouldn't have
to do it and confusing faults such as you've come across don't happen.
Turn Mach on but instead of referencing using the <Ref All> button, go to the machine diagnostics page and using the buttons provided
reference each axis in turn. I'm guessing what is happening is that the Y axis is homing per normal but then as the machine goes to home the next axis in
queue the Y axis attempts to move and immediately limits out. By referencing each axis individually you may catch the machine doing something a bit weird
at a certain time and therefore give you an insight into whats changed.
I really want you to think about getting a controller with more inputs than the one you've got so you can wire switches individually. I can hear you moaning and
whineing from here! Guess what....I don't bloody care.....I've time and time again urged people to NOT combine home and limit switches so this sort of rubbish
doesn't happen. I've long since lost patience when it craps out for those who don't bother to listen.
Craig