Owner's manual

Overtravels and Programmable Zones
Chapter 12
12-13
The control stops tool motion during overtravel conditions. Overtravel
conditions may occur from 3 causes:
hardware 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 the system
installer.
Programmable Zone Overtravel -- The tool reached a travel limit
established by independent programmable areas. Programmable Zones
are activated through programming the appropriate 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 is displayed.
Where : Is :
“HARDWAREOVERTRAVEL (-)BY AXIS (X)” This message indicatesthatthe specified axishas
trippedeitherthe +or - hardwarelimitswitch
mounted onthemachine.
“SOFTWARE OVERTRAVEL (+) BYAXIS(X)” This message indicatesthatthe specified axishas
entered the overtravelarea definedby the softlimits
ineitherapositive ornegative direction.
“VIOLATION OF ZONE (2)BY AXIS(X)” This message indicatesthata tool hasreachedthe
specified axis overtravelarea definedby either
programmable zone2 or3.
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 ESTOP
circuit design and the way PAL was programmed by the system installer.
12.5
Resetting Overtravels