SCSI Device Expansion Module
Power
Supply
The SCSI Device Expansion
Module
power
supply
is a
100
watt
auto
or
wide
ranging
unit
with
a fan for cooling. The
power
supply
is
in
a plastic
and
metal
housing
that is
part
of the
power
supply
assembly.
It
slides
in
from the front
of
the
module
when
the bezel is removed,
and
fastens
in
place
with
an
integral
plastic latch.
It
has a DC connector
that
directly engages the SCSI Device
Expansion
Module
backplane.
The
RJ45
connectors on
the
rear of all SCSI Expansion Modules daisy chain
PWRSUPENABLE*
and
COOLFAIL
*.With
the
power
supply
enable signal
running
in
the same cable as the fail signal, there is
an
automatic "verification"
that
the alarm signal is connected.
The
power
supply
utilizes IEC320 style inlet
and
outlet for AC power. These
face
out
the rear of the enclosure
when
the
supply
is installed.
Cooling is
provided
by
fans
that
are
part
of the
power
supply
unit. The fan
latches into the plastic
portion
of the
power
supply
housing
and
obtains its
12
volt DC
power
directly from the
power
supply.
The
power-on
LED is
driven
directly from the +5V
in
the supply.
It
is located
in
the
front of
the
power
supply
module. This LED provides the only
indication of
an
operating or malfunctioning
power
supply.
Drive Carriers
4-4
Injection
molded
plastic cradles
hold
the
drive
and
an
adapter
board
assembly. The cradle slides
in
from the front of the SCSI Device Expansion
Module,
plugs
into the backplane
and
latches into place. Two types of drive
carrier assemblies are used.
The
bottom
device
mounting
holes are
used
for 5.25 inch removable devices.
A single
high
bezel filler panel is
removed
when
this assembly is installed. The
assembly for
3.5
inch non-removable
media
devices fits
in
either side of the
SCSI enclosure.
A circuit
board
assembly, the
adapter
board,
with
short cables permanently
attached, fastens to the cradle
with
two
self
taping
screws. The
adapter
board
has
a 64-pin
DIN
connector, B
row
contacts omitted,
that
plugs into the
backplane for all
power
and
signals. A
grounding
tab is
part
of this assembly
for ESD control. SCSI addresses are selectable via a rotary switch soldered to
the
adapter
board.
Reference
Guide
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