Chapter
3.
Removal
and
Replacement
Procedures
This
chapter
contains
information
about
powering
the
rack
on
and
off,
and
removing
and
replacing
components.
Use
the
correct
power-on
and
power-off
procedure
for
the
type
of
power
distribution
used
in
your
rack.
Safety
Notices
This
section
contains
safety
notices
that
apply
to
all
the
procedures
in
this
chapter.
Review
this
section
carefully
before
performing
any
power-related
operations.
DANGER
An
electrical
outlet
that
is
not
correctly
wired
could
place
hazardous
voltage
on
metal
parts
of
the
system
or
the
devices
that
attach
to
the
system.
It
is
the
responsibility
of
the
customer
to
ensure
that
the
outlet
is
correctly
wired
and
grounded
to
prevent
an
electrical
shock.
Before
installing
or
removing
signal
cables,
ensure
that
the
power
cables
for
the
system
unit
and
all
attached
devices
are
unplugged.
When
adding
or
removing
any
additional
devices
to
or
from
the
system,
ensure
that
the
power
cables
for
those
devices
are
unplugged
before
the
signal
cables
are
connected.
If
possible,
disconnect
all
power
cables
from
the
existing
system
before
you
add
a
device.
Use
one
hand,
when
possible,
to
connect
or
disconnect
signal
cables
to
prevent
a
possible
shock
from
touching
two
surfaces
with
different
electrical
potentials.
During
an
electrical
storm,
do
not
connect
cables
for
display
stations,
printers,
telephones,
or
station
protectors
for
communications
lines.
D05
CAUTION:
This
unit
has
more
than
one
power
supply
cord.
To
reduce
the
risk
of
electrical
shock,
disconnect
two
power
supply
cords
before
servicing.
C21
Operating
System
Shutdown
Before
powering
off
any
drawers
or
external
devices,
ask
the
customer
if
this
rack
is
used
in
a
high-availability
system.
If
it
is,
notify
the
customer
that
other
attached
systems
might
be
affected
by
this
procedure.
Notify
the
customer
if
you
are
going
to
turn
off
power
to
any
drawers
that
are
attached
to
drawers
or
devices
in
another
system.
Before
powering
off
the
system
unit,
you
must
first
shut
down
the
operating
system
to
prevent
losing
data.
Ask
the
customer
to
shut
down
all
programs.
Failure
to
do
so
can
result
in
the
loss
of
data.
See
your
operating
system
documentation
for
information
about
the
shutdown
command.
Power-On
Procedure
with
the
AC
Power
Distribution
Bus
This
section
covers
the
ac
rack
power-on
procedures.
1.
Plug
all
drawer
power
cables
into
the
outlets
on
the
ac
power
distribution
bus
or
buses.
25
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