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8.2.0
FERRO RESONANT POWER
SUPPLIES
DANGER
With the mainline switch on: Control voltages
are present at the power sequence card, the ac
board, the dual level filter assembly, and the
CE and operator control panels.
With the operator control panel power switch
on:
1.
AC line voltage is present at the disk, diskette,
fans, ac board, and the ferro transformer.
2. DC voltages from the power supplies to the
logic gate and printer are present.
8.2.1 Introduction
All power supplies for the system are located at
the back right-hand side of the machine. AC
power enters the system at the primary power
area, which contains the mainline switch, two
fuses, and a line filter. The mainline switch con-
trols all power to the system. When this switch
is off, all the power is off.
When the mainline switch is on, the sequence con-
trol voltages of
+24
Vdc,
-24
Vdc,
+5
Vdc,
+6
Vdc,
and
-6
Vdc are present. These voltages originate
on the ac board. Further power sequencing and
distribution is controlled by the power switch on
the operator control panel.
The ac board distributes ac power and sequence
voltage, and contains the motor relays for the
system.
The multilevel filter assembly provides the
+12
Vdc,
-12
Vdc,
+8.5
Vdc,
+6
Vdc,
+5
Vdc,
-5
Vdc,
and
-4
Vdc.
The dual level filter assembly provides the
+24
Vdc,
-24
Vdc, and
48
Vac. The
48
Vac is used
only if a serial printer is installed.
The power sequence card provides both power
sequence control and power fault retention capa-
bilities. The source and reason for dropping power
is retained in a set of latches on the sequence card
and can be displayed by the CE
(7.2.13).
Main
Ferro
Transformer
~~i:C~
Fuse
1017
Fuse
102
Load Resistor
Control
Capacitor
\,.----1
(Serial Printer Only) ............
Line Filter
Multilevel Filter Assembly
AC Board
Dual
Level
Filter
Assembly
Ferro Capacitor
Fan Assembly
Power Supplies
8-13
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