deliver
dc
power.
Both
power
supplies
must
be
installed
to
meet
Electromagnetic
Compatibility
(EMC)
and
cooling
requirements.
shows
the
power
supply
and
the
locations
of
the
controls,
indicators,
and
connectors.
v
Hot-swap
power
supply
CRUs:
The
two
hot-swap
power
supplies
are
located
on
the
back
of
the
EXP100.
You
must
install
both
power
supply
CRUs,
even
if
one
power
supply
is
not
working.
v
Levers:
Unlock
these
levers
when
you
remove
or
install
a
power
supply
CRU.
v
Power
LEDs:
These
green
Power
LEDs
light
when
the
expansion
enclosure
is
turned
on
and
receiving
ac
power.
v
Fault
LED:
The
amber
Fault
LEDs
light
if
a
power
supply
failure
occurs.
The
Fault
LED
for
one
power
supply
might
also
light
if
it
is
powered
off
while
the
other
power
supply
is
powered
on.
v
Power
switches:
Use
these
switches
to
turn
the
power
supplies
on
and
off.
You
must
turn
on
both
switches
to
use
the
redundant
power
supplies.
v
AC
power
connectors:
To
provide
ac
power
to
the
expansion
enclosure,
you
must
connect
the
power
cables
to
the
ac
power
connectors
that
are
located
on
the
back
of
the
EXP100.
Fan
controls
and
indicators
The
EXP100
has
two
hot-swappable
and
redundant
fan
units,
as
shown
in
The
fan
units
are
located
at
the
back
of
the
expansion
enclosure.
One
fan
will
continue
to
operate
if
the
other
fan
fails.
You
can
remove
and
replace
the
fan
unit
while
the
EXP100
is
powered
on
and
accessing
drives.
Each
fan
has
a
temperature
sensor
built
into
the
air
inlet.
This
sensor
maintains
fan
speed
to
provide
the
necessary
air
flow.
If
the
speed
of
one
of
the
fans
drops
to
a
level
that
is
too
low
or
stops,
the
Fault
LED
located
on
the
back
of
the
fan
unit
lights,
and
the
General
system
error
LED
on
the
front
of
the
EXP100
lights.
For
the
locations
of
the
LEDs
on
the
front
of
the
expansion
enclosure,
see
For
the
LEDs
on
the
back
of
the
expansion
enclosure,
see
1 Gb/s
2 Gb/s
X10
X1
T
r
ay Number
Conflict
Levers
Power LEDs
Power switches
AC power
connectors
Power supply CRUs
Fault LEDs
Figure
4.
Power
supply
controls,
indicators,
and
connectors
18
IBM
TotalStorage
DS4000
EXP100
Storage
Expansion
Enclosure:
Installation,
User’s
and
Maintenance
Guide
Summary of Contents for TotalStorage EXP100
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