CPU Module
Power Limitations
One
maximum
payload stack requires a
15
amp
115
volt service or the VA
equivalent
at
other voltages.
It
is
rated
at
12
amps
at
115 volts. This rating is on
the Base. The total
payload
is limited to 585
watts
of DC power. Payloads are
limited:
(1)
to the specification of
the
power
supply
in
each module,
(2)
to the
rating
of the module,
and
(3)
to
the
rating for the stack.
Cooling
Cooling of the
modules
is
provided
by
fans
that
are
part
of the
power
supply
assemblies. The
modules
have
air flow
in
one side
and
out
the other. A positive
pressure technique is
used
to avoid taking
in
dirt
through
the removable
media
drive openings. Eighteen inches of space are required
between
two
stacks to
reduce
having
the
heated
air from one stack enter the air intake of
the
other
stack.
A cooling sensor is
on
the
I/0
distribution board. Comparator circuits for
the
first VME Expansion
Module
and
for three VME Expansion Modules are
on
the
I/0
distribution board.
An
air filter is
provided
with
each module. The filters are serviceable from the
front of the enclosure. The bezel
must
be
removed
to access the filter. The filter
is
made
of 30 PPI reticulated washable foam.
Slot Numbering
2-6
Each
module
has four physical positions. The
top
slot is called the first slot
since the
VME
bus
expands from the
top
down. The
VME
bus
in
the CPU
module
has
proprietary
interconnection
between
the first
and
second slots.
The VME modules install
component
side up. The first
VME
slot is the second
from
the
top
slot of the first
module
and
slot
numbering
progresses from
top
to bottom. The first slot of the CPU
Module
is
the
last logical slot
on
the VME
bus
and
it
is reserved for
the
I/0
distribution board.
P2 of the first slot is proprietary
with
the B row dedicated to enclosure level
signals. The B row connects to the
power
supply
to drive LEOs
and
to control
the
power
supply.
It
connects to
the
front
panel
switch via the
power
supply.
The B
row
also connects to cooling sensors
in
the expansion backplanes
and
to
the base
power
supply
through
the
terminator
in
the Base.
Reference
Guide
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