Reference Point Return Check - YASKAWA yasnac i80m Instruction Manual

2.6
REFERENCE POINT RETURN (Cont'd)
Reference Point Return Check (G27)
(1)
This function checks whether
a
part
program
which is created
to
return to
the reference point after starting from the machine reference
point, correctly
returns to
the reference point.
2.6.2
(2)
I.G27
X Y Z (*«
0
When
this command is given,
the machine is positioned
at
the
instructed
point simultaneously for three axes (ÿsimultaneously
for
five
axes)
by
rapid feed, then it is checked whether that position is
the
reference point.
However, for
axes for which coordinate command is
omitted, positioning and check are
not
executed.
(3) If that
position
matches the reference point, the reference point
return
complete lamp lights.
If all of the specified axes
match the reference
point, automatic operation
is continued. If there is
any
axis for which
the position is
not
matched, restore position error (alarm "2072"
—
''2079") results,
and the automatic operation is
interrupted. (The cycle
start
lamp
goes
out.)
(4) If G27 is instructed during tool offset,
the machine is positioned
at
a
point offset
by the corrected quantity, so that the position does
not
match.
Therefore, G27 can only be instructed after
tool offset is
canceled. T ool position offset and tool
length
offset
cannot
be canceled
by G27 command.
(5)
The reference point means a point inherent
to
the machine
to
which
position
the machine can be restored by "manual reference point
return" or "G28 automatic reference
point
return." For details, refer
to
Par.
3. 4. 1. 1,
"Manual Reference Point Return."
(6)
Mirror
image
is valid in the
movement
direction by G27 command.
To avoid
an
unmatch
error,
be sure
to
specify G27 in the M94 (mirror
image
OFF) mode.
(7) No check is made if G27 is executed with
machine lock. If there is
any
one
axis for which machine lock
(e. g.,
disregarded the Z-axis) is ON,
check is
not
made. For example, if X-axis is disregarded
and G27 move
command is made for X-axis,
no
check is made.
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