6.
On
9188
or
7188
ac
power
distribution
buses
only,
remove
the
top
and
bottom
L-bracket
on
the
PDU
via
the
two
screws
per
bracket.
Replacement
This
section
covers
the
replacement
for
the
ac
power
distribution
bus.
1.
On
9188
or
7188
ac
power
distribution
buses
only,
install
the
top
and
bottom
L-bracket
on
the
PDU
via
the
two
screws
per
bracket.
2.
Reconnect
any
power
cables
that
you
disconnected
from
the
other
side
of
the
ac
power
distribution
bus.
3.
Slide
the
ac
power
distribution
bus
into
position,
and
install
the
four
mounting
screws.
4.
Reconnect
any
power
cables
that
you
disconnected
from
the
ac
power
distribution
bus.
5.
Plug
the
power
cables
into
the
locations
that
you
recorded
during
the
removal
procedure.
6.
Follow
the
steps
in
“Power-On
Procedure
with
the
AC
Power
Distribution
Bus”
on
page
25.
Removal
and
Replacement
of
the
DC
Power
Distribution
Panel
This
section
covers
the
removal
and
replacement
procedure
for
the
dc
power
distribution
panel.
CAUTION:
Energy
hazard,
remove
power
before
servicing.
Disconnect
two
power
supply
cords.
C23
Removal
This
section
covers
the
removal
procedures
for
the
dc
power
distribution
panel.
1.
Follow
the
steps
in
“Power-Off
Procedure
with
the
DC
Power
Distribution
Panel”
on
page
29.
Note:
Removing
power
to
the
dc
power
distribution
panel
does
not
remove
power
to
drawers
in
this
rack
that
are
powered
by
the
dc
power
distribution
panel
in
another
rack.
2.
Have
the
customer
turn
off
the
dc
power
source
that
connects
to
the
dc
power
distribution
panel.
3.
After
the
customer’s
-48
V
dc
source
power
is
turned
off,
ensure
that
a
tag
or
label
is
positioned
over
the
power
source
switches
to
indicate
that
the
power
is
intended
to
be
off
(lock-out/tag-out).
4.
Remove
the
six
mounting
screws
from
the
top
cover
of
the
power
distribution
panel.
Then
remove
the
top
cover.
5.
Remove
the
-48
V
dc
bus
shield
(insulation)
from
the
dc
power
distribution
panel.
6.
If
one
is
installed,
remove
the
cable
channel
cover.
Chapter
3.
Removal
and
Replacement
31
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