
Chapter 11
Coordinate Control
11-43
The control stops grinding wheel travel during overtravel conditions.
Overtravel conditions can occur from 3 causes:
hardwar e overtravel ---- the axes reach a travel limit, usually set by a
limit switch or sensor mounted on the axis. Hardware overtravels are
always active.
software overtravel ---- commands cause the axis to pass a software
travel limit. Software overtravels are active only after the axis has been
homed provided the feature has been activated in AMP by your system
installer.
programmable zone overtravel ---- The wheel reached a travel limit
established by independent programmable areas. Programmable zones
are activated through programming the appropriat e G code.
In all cases, the control issues an error message.
When an overtravel condition occurs, all axis motion is forced to a stop,
the control is placed in cycle stop and one of the following applicable error
messages appears:
Ifyou see this error message: Itmeans that:
“HARDWARE OVERTRAVEL (-) AXIS(X)” thespecifiedaxis has trippedeither the+ or -
hardwarelimit switch mounted on themachine
“SOFTWARE OVERTRAVEL (+) AXIS (X)” the specified axis has enteredthe overtravelarea
definedby the software overtravel limitsin either a
positive or negativedirection
“VIOLATION OF ZONE (2) AXIS (X)” thewheel has reachedthespecifiedaxis
overtravelarea defined by eitherprogrammable
zone2or3
When an overtravel of any type has taken place, axis feed in the same
direction as the feed causing the overtravel is not allowed. Only axis feed
in the reverse direction is possible.
How a hardware overtravel condition is reset depends 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. Eliminate any other possible conditions that can have caused
emergency stop, then make sure that it is safe to reset the emergency
stop condition.
11.8.5
Resetting Overtravels
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