Yaskawa YASNAC PC NC I/O Signal Function Manual - Manual (Page 93)

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YASNAC PCNC I/O Signal Function Manual Chapter 10: Safety and Maintenance Functions
10.12 Overtravel Input Signals
The overtravel input signal indicates that the movable machine unit has reached the stroke end.
When the overtravel input signal is “closed”, axis movment is stopped in the manner as indicated
in Table 10.2, then the alarm output signal ALM is “closed” and the alarm message is displayed
on the screen.
Table 10.2 Axis Movement Stop Mode at “Opening” of Overtravel Input Signal
If the overtravel input signal is “closed”, manually move the related axis in the direction opposite
to the “closed” signal direction (jog, manual pulse generator) until the input signal is “closed”.
After that, execute reset operation to close the alarm state output signal and clear the alarm
display.
IMPORTANT!
1. Even when an alarm occurred due to the “opening” of the overtravel input signal, the M, S
andT code read output signals MFA, SF and TF are not closed. If it is necessary to interrupt
the operation by M, S and T codes after the occurrence of an overtravel alarm, take the inter-
lock by the external sequence.
2. If the overtravel alarm occurs, an alarm number in the range from 2001 to 2005 is displayed.
In this case, axis movement is stopped. (Servo power is not turned OFF.)
Overtravel Input Signals
*+X to *+5 #30740 to #30744
*-X to *-5 #30750 to #30754
Manual Mode Automatic Mode
*+X to *+5
input is“opened”
Axis movement in the
positive (+) direction stops.
Movement of all axes and
in all directions are stopped.
*-X to *-5
input is“opened”
Axis movement in the
negative (-) direction stops.