
B-63783EN-1/01 2.PREAPARATIONS FOR OPERATION
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2.3 OVERTRAVEL CHECK
2.3.1 Overtravel Signal
Overview
When the tool tries to move beyond the stroke end set by the machine
tool limit switch, the tool decelerates and stops because of working the
limit switch and an OVER TRAVEL is displayed.
Signal
Overtravel signal
*+L1<G64#0>, *+L2<G68#0>, ...
*-L1<G64#1>, *-L2<G68#1>, ...
[Classification] Input signal
[Function] Indicates that the control axis has reached its stroke limit. There are
signals for every direction in every control axis. The +/- in the signal
name indicates the direction and the number corresponds to the control
axis.
+Lx
x : 1 ....Movement in the + direction on the first axis has reached the
stroke limit.
2 ....Movement in the + direction on the second axis has reached the
stroke limit.
3 ....Movement in the + direction on the third axis has reached the
stroke limit.
: :
-Lx
x : 1 ....Movement in the - direction on the first axis has reached the
stroke limit.
2 ....Movement in the - direction on the second axis has reached the
stroke limit.
3 ....Movement in the - direction on the third axis has reached the
stroke limit.
: :
[Operation] When it is "0" , the control unit operates as given below.
- In automatic operation, if even one axis overtravel signal turns to
"0", all axes are decelerated to stop, an alarm is given and
operation is halted.
- In manual operation, only the axis whose movement signal has
turned to "0" is decelerated to a stop, and the axis can be moved in
the opposite direction.
- Once the axis overtravel signal has turned to "0", the axis
direction is registered. Even if the signal returns to "1", it is not
possible to move that axis in that direction until the alarm is
cleared.