YASKAWA YASNAC 3000G

2.14.10
REFERENCE
ZERO
CHECK
(G27
)+
The
position
of
the
tool
commencing
a
return
to
reference
zero
should
be
within
a
region
in
which
return to
reference
zero
is
possible
(before
de¬
celeration
LS). (Alarm
code
"24")
It
is
possible
to
program
the
tool
to
move
within
a
region
in
which the
return to
reference
zero
is
possible
by
the
preceding
programming
of
posi¬
tioning
command.
This
function
checks
if
the tool which
has been
programmed
to start at
the
reference
zero
of
the
machine and
return to
the
reference
zero
point
accurately.
c
G27
X-
•
•
Y-
•
.
Z-
-
.
(a+-
. .
)
*
EXAMPLE
When this
command
is
given,
the
tool
moves
at
rapid
traverse rate
along
the
three
axes
(four
axest)
simultaneously
to
the
programmed
point,
and
a
check is
made
if
this
position
is
reference
zero
point.
However,
positioning
and check
are
:
not
executed
for
an
axis
for.
which
a
coordinate
.command
was
omitted.
ZERO POSITION
lamps
light
up
if
this
position
matches
reference
zero
point.
Automatic
oper¬
ation
continues
if
maching
is
made
with
all
of
the
designated
axes
.
If
there is
any
axis
with
which
matching
is
not
made,
a
reference
zero
error
(alarm
code
”24")
occurs,
and automatic
opera¬
tion is
interrupted.
(CYCLE
START
lamp
goes
out
.
)
'
If
G27
is
given during
tool radius
compensation,
matching
cannot
be made because the
tool is
po¬
sitioned
to
the
point
offset
by
the
compensation
value.
Use
G27
with
tool
radius
compensation
cancelled.
Reference
zero
point
is
a
fixed
point
of
the
ma¬
chine and the
return to
this
point
can
be
made
by
"manual
return
to
reference
zero"
or
"G28
auto¬
matic
return to
return
to
reference
zero."
See
6.2.
1
Manual
Return
to
Reference
Zero.
The
mirror
image
is
effective
to
the
direction
of
movement
by
a
G27
command.
Program
G27
in
M94
(mirror
image
off)
mode
to
avoid
a
mismatch
error.
G28
Y
• •
•
Z
•
•
-
*
(In
the
case
of
absolute
input)
Z
REFERENCE
ZERO POINT
4
1
Z
AXIS
DECELERATION
LS
K\
POSITIONING
START
POINT
RETURN
TO
REFERENCE
•v
ZERO
!
\
INTERMEDIATE
POSITIONING
POINT
Z
Y
AXIS
DECELERATION
LS
Y
Fig.
2.
14. 11
"Return
to
reference
zero
motion"
means
the
se¬
quence
of
motions
equal
to
that
from
commence¬
ment
of
movement
of
the
manual
return
to
refer¬
ence
zero
to
the
return
to
reference
zero
point.
NOTES:
•
An
input
error
occurs
when
G28
is
given
in
tool
radius
compensation
mode
(G41,
G42)
or
can¬
ned
cycle
mode.
(
-»
"0215")
-
An
input
error occurs
when
G28
is
given
in
mir¬
ror
image
(M95). (
-*ÿ
"1215")
•
Tool
offset
is
not
cancelled
by
G28
command.
But
G28
should
be
given
after
cancelling
tool
offset
as
a
rule
.
2.14.11
AUTOMATIC
RETURN
TO
REFERENCE
ZERO
(628)+
G28
X-
• •
Y.
• •
Z-
•
-
(«+...)
*
With
this
command,
the
tool
can
be
programmed
to return to
reference
zero.
The
tool
moves
to
the
programmed
position
at
rapid
traverse
rate,
and
then
makes
"return
to
reference
zero"
auto¬
matically.
When
the
content
of
parameter
No.
86
is
"l,"the
control
can
performs
"rapid.
return
to
reference
zero"
instead
of
"automatic
return
to
reference
zero"
described
above. The
operation
is
as
fol¬
lows
;
Tool
can
be
programmed
to
move
simultaneously
in
three
axes
(4
axes+).
However,
the
tool
will
not
move
in
the
direction
for
which
a
coordinate
instruction
is
omitted.
-
36
-