Floating Head problem

[professorburnout]

I am setting up a floating head on my plasma table and using the following code in Mach3 to set the material height.
N5 G28.1 Z.0
N6 G92 Z0
N7 G00 Z.73
N8 G92 Z0
N9 G00 Z-.2
N10 M03

When I manually home the machine the head travels down until the head is pushed up and the switch is made (This is the switch I have configured as the Z home). But when I run the code listed above the Z-axis moves up. Am I missing a setting setting somewere to cause the z-axis to move up instead of down to the torch switch?