Rockwell Automation 8520-MUM 9/Series CNC Mill Operation and Programming Manual Documentation Set User Manual
Page 340
Chapter 12
Overtravels and Programmable Zones
12-2
There are two types of overtravels.
Hardware overtravels -- Established by the system installer by mounting
mechanical limit switches on the movable range of the axes.
Software overtravels -- Established in AMP by the system installer
designating coordinate values in the machine coordinate system.
There are two types of Programmable Zones.
Programmable Zone 2 -- Established by the operator, or person in
charge of job setup. The machine coordinate system boundaries for this
zone are entered in a table. Programmable zones may be turned on and
off in the part program.
Programmable Zone 3 -- Established by the operator, programmer, or
person in charge of job setup. The machine coordinate system
boundaries for this zone are entered in a table or through programming.
Programmable zones may be turned on and off in the part program.
When the machine tool is set up the system installer should have installed a
set of two mechanical limit switches on each axis. These limit switches are
installed in a position such that when the machine attempts to move
beyond a range determined by the system installer the limit switch will be
tripped. When the limit switch is tripped axis motion stops. The area
defined by these limit switches is referred to as the hardware overtravel.
These switches are installed to prevent the machine from motion that
exceeds a range that might cause damage to the machine. Frequently the
system installer will wire the hardware overtravel directly into the E- stop
string. This will stop all motion and disable the axis drives. Refer to the
literature provided by the system installer for instructions on moving axes
out of hardware overtravel.
CAUTION: The area defined by a hardware overtravel does
not take in to account tool offsets. This may allow the actual
tool to enter the restricted area without the axes entering it.
12.1
Hardware Overtravels