c
(
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POWER SUPPLY
PC
BOARD
The
PC
board uses a small, high power, high frequency
transistor switching regulator
(TSR)
supply
to
develop
five
DC
voltages
for
the 5100 system:
+5
Vdc
-5
Vdc
Basic logic voltage
Tape control card, storage cards, BSCA
cards, and common
ROS
+8.5 Vdc Storage cards, keyboard, display adapter,
printer adapter, BSCA cards, and all
ROS
cards
+12 Vdc Display unit. tape select magnets, tape
LEOs,
BSCA cards, and 5114
R1
relay
-12
Vdc Tape unit, 5114
R1
relay, BSCA cards,
and asynchronous communications/serial
I/O
card
The
DC
outputs may vary from
+10%
to
-9%
of
the
rated voltage before they affect the operation
of
the
system.
DC POWER DISTRIBUTION
The five voltages supplied
to
the attached
I/O
devices
are distributed through the interface port
of
the 5100
through the power cable
of
the attached device. All
I/O
devices, except the 5103, also have
an
interface port
to
which
the
next device is attached
in
serial fashion. The
5106 and the 5103 each have
an
I/O
cable assembly
that includes a power connector plug (A 1). The voltage
ground is distributed through the
I/O
cable signal
connectors (A2, A3)
of
the
I/O
cable.
POWER SUPPLY PROTECTION
The 5100 power supply has
built-in
overvoltage,
undervoltage, and overcurrent protection. The
overvoltage protection shuts down the
power
supply
when the +12 Vdc output exceeds
+16
Vdc. The
undervoltage protection shuts down the power supply
when the
-5
Vdc is less than
-3
Vdc. The overcurrent
protection automatically shuts down the power supply
when the current
in
the primary
of
the transformer is
excessive. Any time that the power supply automatically
shuts down the 5100, the computing system should be
powered
down
with
the
ON/OFF
switch
for
at least five
seconds before
it
is powered up again.
REFERENCED VOLTAGE
A +6 Vdc controlled voltage is provided on the display
card (J2) as a reference
in
critical voltage
measurements.
Power 4·51
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