Okuma OSP-U10M - Page 5

ME00-001-R1
P-(iv)
SAFETY
PRECAUTIONS
6.
Precautions
during
Maintenance
Inspection
and
When
Trouble
Occurs
In
order
to
prevent
unforeseen
accidents,
damage
to
the
machine,
etc.,
it
is
essential
to
observe
the
following
points
when
performing
maintenance
inspections
or
during
checking
when
trouble has
occurred.
(1)
When trouble
occurs,
press
the
emergency
stop
button
on
the
operation
panel
to
stop
the
machine.
(2)
Consult
the
person
responsible
for
maintenance
to
determine what
corrective
measures
need
to
be
taken.
(3)
If
two
or more
persons
must
work
together,
establish
signals
so
that
they
can
communicate
to
confirm
safety
before
proceeding
to
each
new
step.
(4)
Use
only
the
specified
replacement
parts
and
fuses.
(5)
Always
turn
the
power
off before
starting
inspection
or
changing
parts.
(6)
When
parts
are
removed
during
inspection
or
repair
work,
always
replace
them
as
they
were
and
secure
them
properly
with
their
screws,
etc.
(7)
When
carrying
out
inspections
in
which
measuring
instruments
are
used
-
for
example
voltage
checks
-
make
sure
the instrument is
properly
calibrated.
(8)
Do
not
keep
combustible materials
or
metals
inside the
control enclosure
or
terminal
box.
(9)
Check
that
cables and wires
are
free
of
damage:
damaged
cables
and
wires
will
cause
current
leakage
and
electric
shocks.
(1
0)
Maintenance inside
the
Control
Enclosure
a)
Switch
the
main
power
disconnect switch
OFF
before
opening
the
control
enclosure
door.
b)
Even
when
the
main
power
disconnect switch
is
OFF,
there
may
some
residual
charge
in
the
servo
amplifier
and
spindle
drive
unit,
and
for
this
reason
only
service
personnel
are
permitted
to
perform
any
work
on
these
units. Even
then,
they
must
observe
the
following
precautions.
-
Servo
amplifier
Discharge
the residual
voltage
one
minute
after
turning
off
the breaker inside the
unit.
-
Spindle
drive
unit
Discharge
the
residual
voltage
one
minute
after
turning
off
the
main
power
disconnect switch.
c)
The
control enclosure
contains
the
NC
unit,
and the
NC
unit
has
a
printed
circuit board
whose
memory
stores
the
machining
programs,
parameters,
etc.
In
order
to
ensure
that
the
contents
of
this
memory
will
be
retained
even
when
the
power
is
switched
off,
the
memory
is
supplied
with
power
by
a
battery.
Depending
on
how
the
printed
circuit
boards
are
handled,
the
contents
of
the
memory
may
be
destroyed
and
for
this
reason
only
service
personnel
should handle
these
boards.