"-
Power
Supply
Power Supply
A
power
supply
is installed
in
each module.
It
slides
in
from
the
front of
the
module
when
the bezel is
removed
and
fastens
in
place
with
a finger
operated
integral plastic latch.
The
190
watt
auto
or
wide
ranging
power
supply
contains
two
fans for cooling. The
power
supplies
do
not
operate
when
the
power
supply
is
disengaged
from the enclosure
at
its
output
connector. This
stops
the fans from running.
DC
Voltages
DC voltages of three VME Expansion
Modules
and
the DC fail signal from the
SCSI Device Expansion
Module
are
monitored
by
a circuit
on
the
I/0
distribution board.
That
circuit generates a
SYSRESET*
during
the
time
any
DC voltage
has
dropped
out. The CPU
Module
relies
on
the single
board
computer
to
monitor
its DC.
VME Backplane
The VME backplane obtains
power
directly from the
power
supply. A 96-pin
DIN
connector
in
the
power
supply
is used.
It
engages a
96
contact receptacle
connector identical to the one
used
for P1
in
the VME slots.
Power Supply Circuit Board
Six LEDs are
soldered
into a
power
supply
circuit board. The
power
on
indicator is
driven
by
5V power. The
other
5 LEDs are
driven
by
the
I/0
distribution
board
via
pins
in
the
96-pin connector.
AC Connection
There is
not
an
AC
power
switch. All the
power
supplies are
turned
on
by
a 5
volt signal
that
drives
an
LED
in
each
power
supply's
opto-isolator. The
power
supply's
front
end
circuits are
powered
up
as soon as AC
power
is connected
to the outlet. The
power
supply
runs
only
when
the 5V signal is present.
The 190
watt
power
supply
requires the Base
Unit
Power
System to
meet
power
cord
RFI
regulatory requirements. Its
power
cord
must
be
wired
to the
Base
Unit
power
system
where
the
low
frequency filter is located.
S900RF/D4 2-5
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
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