I can't seem to get mach 3 to home. My DRO's do not turn green and my soft limit doesn't turn green. I set the limit switches (X,Y to their coordinates and Z to its minus coordinate. I can get my machine to go to Zero, But when hitting Ref to Zero my machine want to move only my Z axis to the limit switch and cause a hit limit switch to stop the machine. can't get the soft limit switch to turn green