Homing direction problem

Since I changed the configuration to make the homing speeds negative I am posting the files again.

Now, however, the Z axis has chosen to try to home in the wrong direction ...

I tried changing from (eg) X home to X max limit
but then I get "Joint 0 on limit switch error" (even when inverted)

It ought to be possible to get the machine to home at the limits and indeed it did for months before I had to replace the electronics. It would go to the end of the axis, hit the switch and back off a bit. The hal and ini files were pretty much as they are now