Rockwell-automation 8520-GUM 9/Series CNC Grinder Operation and Progra Manual de usuario Pagina 219

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Running a Program
Chapter 7
7-31
While block retrace is active, the control disables all jog features with the
exception of
<JOG RETRACT>. See page 7-27 for details on Jog Retract.
MDI is not available to insert blocks during a block retrace operation.
The block retrace function is unable to retrace any of the following blocks
andanattempttodosoresultsinanerrormessage:
Thread grinding
Inch/Met ric changes (unit conversion)
A block that commands a change in the coordinate system
Any block that is followed by a Manual Jog Move except a Jog Retract
The number of blocks retraced is already equal to the maximum number
of retraceable blocks as determined in AMP
Certain Paramacro Parameter Assignments
Interrupt programs or interrupt dressing operations
ATTENTION: If the block retrace function is deactivated
during its execution (performing a control reset, E-Stop, etc.),
attempting to return the axis by pressing cycle start can cause an
undesired return path as shown i n Figure 7.8. The axis returns
to the start point of the block retrace along a linear path that is
usually not the same as the retracted path. To avoid possible
part or wheel damage, jog the grinding wheel to the point from
which block retrace was started prior to pressing cycle start.
Figure 7.8
Pressing Cycle Start When Ret ract Path is Lost
Blockretrace
abortedhere
Start point
ofblock
retrace
Normalblock retracepath
Returnpath takenwhen
cycle start is pressed after
blockretraceis aborted
12012-
I
END OF CHAPTER
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