of the indicator illuminates white to indicate
position is labeled HIGH RESET. In this
the primary +5 volt dc power converter is
position, the DDI displays the high reset value of
in operation. The lower portion of the indicator
the selected parameter. The middle position,
illuminates white to indicate the backup +5 volt
labeled ALARM SET VALUE, displays the alarm
dc power converter is in operation. The sixth
set point of the selected parameter. The bottom
indicator is labeled VERTICAL PANEL 115
position, labeled LOW RESET, displays the low
reset value of the selected parameter. This toggle
VAC CONTROL POWER ON. This indicator
illuminates white to indicate 115-volt ac control
switch is not on digital displays No. 2 and No. 3.
power is available to the ACC vertical panel. The
The third item is a set of three thumbwheels
seventh indicator, labeled LOWER PANEL 115
labeled ADDRESS. The thumbwheels are used to
VAC CONTROL POWER ON, illuminates white
select the address of the parameter to be
to indicate 115-volt ac control power is available
measured. The last toggle switch on the digital
to the ACC lower panel.
display is a three-position toggle switch. The
The fourth section of the top panel contains
top position is labeled HIGH LIMIT. In this
four push-button indicators and a potentiometer
position, the DDI displays the high limit of the
(D). The first push-button indicator, labeled
selected parameter. The middle position, labeled
CONSOLE HIGH TEMPERATURE, illuminates
ACTUAL, displays the actual value of the selected
to indicate the console temperature has exceeded
parameter. The bottom position, labeled LOW
the preset limit. The second push-button
LIMIT, displays the low limit of the selected
indicator, labeled CONSOLE HEATER ON,
parameter.
illuminates to indicate the console heater is
energized. Heater power is applied when the
CONSOLE POWER STATUS Section
console power circuit is de-energized. The third
push-button indicator, labeled HORN TEST,
The third section of the top panel is labeled
allows the operator to test the level 2 audible
CONSOLE POWER STATUS (C). This section
alarm. A level 2 alarm is indicated by a horn. The
monitors the power supplies of the ACC. It
fourth push-button indicator, labeled BELL
contains seven push-button indicators. The first
TEST, allows the operator to test the level 3
status indicator is labeled 115 VAC MASTER
audible alarm. A level 3 alarm is indicated by a
POWER ON. It illuminates white to indicate 115
bell. The potentiometer, labeled VOLUME,
volts ac is available to the ACC. The second
allows the operator to adjust the volume of the
indicator is a split-legend status indicator labeled
audible alarm annunciator.
PRIMARY +28 VDC ON and BACK UP +28
VDC ON. The upper portion of the indicator
illuminates white to indicate the primary +28 volt
ACC VERTICAL PANEL
dc power converter is in operation. The lower
portion of the indicator illuminates white to
The ACC vertical panel is shown on figure
indicate the backup +28 volt dc power converter
9-23. This panel contains the controls and
is in operation. The third indicator is a split-legend
indicators for seven of the systems on the ACC.
status indicator labeled PRIMARY +15 VDC ON
Study figure 9-23 as you read the following
and BACK UP +15 VDC ON. The upper portion
descriptions.
of the indicator illuminates white to indicate the
primary +15 volt dc power converter is in
operation. The lower portion of the indicator
Machinery Space Ventilation
illuminates white to indicate the backup +15 volt
Fans (Emergency Use)
dc power converter is in operation. The fourth
indicator is a split-legend status indicator labeled
Eight pairs of push-button switches are
PRIMARY 15 VDC ON and BACK UP 15
provided for emergency control of the machinery
VDC ON. The upper portion of the indicator
space supply and exhaust fans. Each pair has a
illuminates white to indicate the primary 15 volt
FANS RUN and a FANS STOP push button.
dc power converter is in operation. The lower
Status of the fans is indicated by the lights in the
portion of the indicator illuminates white to
indicate the backup 15 volt dc power converter
respective push buttons. Each machinery space
fan control functions identically. For this reason,
is in operation. The fifth indicator is a split-legend
we will discuss only one pair of push-button
status indicator labeled PRIMARY +5 VDC ON
controls.
and BACK UP +5 VDC ON. The upper portion
9-30
