Rockwell-automation 8520-GUM 9/Series CNC Grinder Operation and Progra Manual de usuario Pagina 113

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Manual/MDI Operation Modes
Chapter 4
4-9
The control stops wheel motion during overtravel conditions. Overt ravel
conditions can occur from 3 causes:
OvertravelCondition Cause
hardwareovertravel The axesreach a travel limit,usually setby a limitswitchor
sensormountedontheaxis.
Hardwareovertravelsare alwaysacti ve.
software overtravel Commandscause thegrinding wheel to passasoftware
travel limit.
Software overtravels are active only afterthe axishas been
homed,provided thefeaturehasbeen activatedin AMPby
your system installer.
programmable zone overtravel Theaxes reachatravel limitestablishedbyindependent
programmable areas.
Programmable zones areactivatedthroughprogrammingthe
appropriate G--code.
We describe these 3 causes of overtravel in detail on pages 11-34 through
11-36.
When an overtravel condition occurs, all axis motion is forced to a stop.
The control is placed in cycle stop and one of these applicable error
messages appears.
Ifyou get this error message: Itmean s that:
“HARDWARE OVERTRAVEL (-) BYAXIS(X)” the specifiedaxis hastripped eitherthe + or -
hardwarelimit switch mounted on themachine.
“SOFTWARE OVERTRAVEL (+) BY AXIS (X)” an attemptwas madebythe specifiedaxis to
enterthe overtravel area defined bythe
softlimitsin eitherapositive or negative
direction.
“VIOLATION OF ZONE (2) BY AXIS (X)” anattemptwas madebythe specifiedaxis to
enterthe overtravel area defined byeither
programmable zone 2 or 3.
When an overtravel of any type has taken place, you are not allowed to
feed the axis in the same direction as the feed causing the overtravel. 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 may have caused
emergency stop, then make sure that it is safe to reset the emergency
stop condition.
4.4
Resetting Overtravels
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