Rockwell Automation 8520-MUM 9/Series CNC Mill Operation and Programming Manual Documentation Set User Manual
Page 107
Manual/MDI Operation Modes
Chapter 4
4-7
Programmable Zone Overtravel ---- the axes reach a travel limit
established by independent programmable areas. Programmable Zones
are activated through programming the appropriate G-code.
These 3 causes of overtravel are described in detail in chapter 12.
When an overtravel condition occurs, all axis motion stops, the control is
placed in cycle stop, and one of the following error messages is displayed.
Message:
Description:
HARDWARE OVERTRAVEL (-) BY AXIS (X)
indicates that the specified axis has tripped
either the + or - hardware limit switch mounted
on the machine.
SOFTWARE OVERTRAVEL (+) BY AXIS (X)
indicates that an attempt was made by the
specified axis to enter the overtravel area
defined by the softlimits in either a positive or
negative direction.
VIOLATION OF ZONE (2) BY AXIS (X)
This message indicates that an attempt was
made to enter the overtravel area defined by
programmable zone 2 or 3.
When a software or zone overtravel has taken place, you cannot move the
axis in the same direction as the overtravel. Only axis motion in the
reverse direction is possible.
Reset a hardware overtravel condition depending on the E-Stop circuit
design and the way PAL was programmed by your system installer.
To reset a software or programmable zone overtravel condition:
1.
Determine whether the control is in E-Stop. If it is not, go to step 4.
2.
Look for and eliminate any other possible conditions that may have
caused emergency stop, then make sure that it is safe to reset the
emergency stop condition.
3.
Press the
<E-STOP RESET>
button to reset the emergency stop
condition. If the E-Stop does not reset, it is a result of some cause
other than overtravel causing E-Stop.
4.
Make sure it is safe to move the axis away from the overtravel limit.
5.
Use any of the jog features described on page 4-1, except homing
and jog offset, to manually move the axis away from the limit. Any
attempt to jog the axis in the direction of the overtravel will not be
allowed.