Yaskawa Yasnac PC NC - Manual (Page 38)

YASNAC PC NC Operating Manual Chapter 2: PC NC System Outline
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2.5.3 Manual Reference Point Return to the Second Reference Point*
The axis are automatically positioned at the second reference point. This operation allows posi-
tioning at the second reference point independent of the present axis position, whether it is in
the negative side or positive side from the second reference position. Follow the procedure indi-
cated below.
Select the jog or rapid mode by placing the MODE SELECT switch in the JOG or RAPID
position.
Turn ON the ZRN2 (second zero point return request) switch on the machine operation panel.
Keep the JOG switch corresponding to the axis and direction of reference point return. The
corresponding axis is positioned at the second zero point at the jog feedrate or rapid traverse
rate according to the selected mode.
• If the ZRN2 switch is turned OFF while an axis is moving to the second reference point,
the axis stops moving. To restart the second reference point return operation, turn ON the
ZRN2 switch and turn OFF the JOG switch having been pressed once, then press it once
again.
• If the JOG switch is pressed again to be turned OFF while the X-axis is moving to the sec-
ond zero point, the axis stops moving. In this case, press the JOG switch again to turn it
ON, and the X-axis restarts moving to the second zero point.With the Y- and Z-axis, this
is also applied.
1. If the JOG switches of [+] and [–] are pressed at the same time, the corresponding axis
stops moving since this operation is assumed to have turned OFF the JOG switch.
2. It is not allowed to use the first zero point return mode and the second reference point
return mode at the same time. If both input signals are ON at the same time, both of the
modes are invalid and neither jog nor rapid feed is executed. This feature is provided to
ensure safety.
3. If the NC is in either the machine lock state (including the machine lock for individual
axis) or the Z-axis command disregard state, the second zero point return operation can-
not be executed. When a JOG switch is pressed under such a state, normal jog operation
is preformed.
4. With the axis for which second zero point return has been completed, manual axis move
operation is allowed only after the ZRN2 (second reference point return) switch is turned
OFF.