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APPENDIX B - SYSTEM CONTROL PANEL
• System control panel provides operator, inter-
vention, and maintenance controls.
The system control panel (Figure
136)
contains the
switches and indicators,required for system: opera-
tion. Twelve panel secti:Qns contain operator, inter-
vention, and maintenance controls.
Panel sections C and N provide basic operational
control. Panel sections
G,
L, and M provide inter-
vention and maintenance controls. The remaining
panels provide maintenance controls.
CONTROLS AND INDICATORS
•
Five types of control switches.
•
Switchable indicators on panel section G.
•
Functional grouping of switches and indicators.
Each panel section contains switches and/or indicators
grouped by function.
Five types of switches are used:
1. Rotary Select--Position defines function.
2. Roller Select--Position selects status indicator
data.
3. Data Key--Lever switch active in the down
position.
4. Control Key--Lever switch selects indicated
function.
5. Pushbutton--Active when pressed.
Panel sections A, G, L, and M have vertically-
placed letters and/or horizontally-placed numbers to
aid in locating a particular switch or indicator.
Section A - Power Display
The power display panel section contains power check
indicators, marginal check controls, a de off switch
and a voltmeter.
DC Off Switch
This keylever switch removes de power from the CPU,
storage, and channels. Attached adapters are not
affected except for the 1052 adapter which is packaged
in the CPU.
DC Off Indicator
This indicator is on when de power has been removed
from the CPU, storage, and channels.
140
(3/71)
Model 50 FEMM
Frame Thermal
Three indicators monitor frame temperatures in the
system. The opening of any thermal switch in the
CPU, storage, or power frame causes the removal
of de power from the CPU, storage, and channels.
The frame in fault is indicated by a light (CPU, STOR,
or PDU) which remains on when power drops.
Open CB
This indicator is turned on if any circuit breaker in
the power frame opens.
Power Check
The detection of an overcurrent condition in any de
regulator turns on the power check indicator. The
detection circuitry is interlocked with the power
sequence controls to remove the voltages or prevent
their application. This indicator remains on when
power drops.
Meter
The panel meter allows direct monitoring of any
system voltage under control of the marginal voltage
seledt and monitor voltage select rotary switches.
Two scales are provided: the upper is numbered
2 through 10, with 6 at center scale; the lower is
numbered 1 through 5, with 3 at center scale. Scale
reading is either times 1 or times 10. Electrical
accuracy at center scale is
±
0.3 percent of full-
scale deflection and at end scale it is _. 0. 6 percent
of full-scale deflection.
Marginal Voltage Select
This rotary switch selects the marginal voltage to
be monitored on the meter. The following voltages
may be selected:
+6
TC (Temperature Compensated - Local Storage)
+6
VAR (Variable - Local Storage)
+6
Ml (Variable - Channel)
+6
M2 (Variable - CPU)
-12 ROS #1
-12 ROS #2
+56 XY 1 (Main Storage XY Drivers)
+60 Z 1 (Main Storage Z Drivers)
+56 XY 2 (Main Storage XY Drivers)
+60 Z 2 (Main Storage Z Drivers)
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