SHAFT TURNS SECTION.--This section
the operator to set the clock on the DEMANDS
has two subsections. The LOGIC UPDATE
panel. It has three spring-loaded toggle switches.
subsection has six thumbwheels. They are used
From left to right, the toggle switches are
to update the logic used by the processor to print
labeled HOURS, MINUTES, and SECONDS.
the total number of shaft turns on the bell
These switches are three-position, toggle switches.
logger. Below these thumbwheels is a push-button
The center position is labeled OFF. In the OFF
switch labeled ENTER. When this switch is
position, the clock will display and count
depressed, it loads the value dialed on the logic
automatically. Moving the HOURS switch up or
update thumbwheels into the applicable registers.
to the FAST position and holding it there causes
Located next to the LOGIC UPDATE subsection
the hour portion of the clock to increment at the
is the COUNTER subsection. It has two toggle
rate of 10 hours per second. Moving the switch
switches. Both switches are spring-loaded. The
to the lower or SLOW position and holding it
upper switch is used to control logic that drives
there causes the clock to update at the rate of
the mechanical TOTAL SHAFT REVOLUTIONS
1 hour per second. The middle switch is for
counter (fig. 6-10, section C). The upper switch
MINUTES. Its positions are also labeled FAST/
is used with the lower switch to update the counter
OFF/SLOW. With the switch in the OFF (middle
prior to the ship getting underway. When the
or rest) position, the clock will count auto-
switch is at the rest (NORMAL OPERATE)
matically. Moving and holding the switch in the
position, the counter (on the PCC panel) will
up or FAST position causes the minute portion
count as a function of the shaft revolution
of the clock to update at the rate of 1 minute per
sensor. When the switch is held in the UPDATE
second. Moving and holding the switch in the
position, the counter will count as a function of
down or slow position causes the minutes portion
the FAST/OFF/SLOW (lower) toggle switch. The
of the clock to update at the rate of 1 minute every
FAST/OFF/SLOW spring-loaded, toggle switch
3 seconds. The last switch is for SECONDS. This
is enabled when the NORMAL OPERATE/
switch in the OFF (middle or rest) position allows
UPDATE toggle switch is in the update position.
the clock to operate automatically. Moving the
The switch position at OFF (middle or rest) will
switch to the up or FAST position causes the clock
not allow the counter to count. When the switch
to update at the rate of 10 seconds per second.
is held in the FAST (upper) position, the counter
Moving the switch to the down or STOP position
will count at the rate of 10 revolutions per second.
stops (or freezes) the clock.
When the switch is held in the SLOW (lower)
position, the counter will count at the rate of one
PCC CONTROL MODES
revolution per second.
The PCC controls the operation of the
PITCH TRIM SECTION.--The next section
propulsion system in the programmed control
mode or the remote manual control mode.
of the operational adjustments panel is the
PITCH TRIM section. This section has three
recessed, screwdriver adjustable potentiometers.
Programmed Control Mode
They allow compensation between the propeller
pitch subroutine of the software program and the
The programmed control mode is the primary
equipment that performs the propeller pitch
mode for controlling the propulsion system. In
adjustment. The top potentiometer is for AHEAD
this mode the operator controls a single
TRIM. It is adjusted to give 23.5 feet pitch,
(PROGRAMMED CONTROL) lever. This lever
when operating in programmed control, with a
provides an input to the processor. The processor
command equal to or greater than ahead 2/3. The
uses this input to set the pitch of the propeller
middle potentiometer is for ASTERN TRIM. It is
blades and the speed of the GTE(s).
adjusted to give 14.7 feet pitch, when operating
Two methods of control are used in the
in programmed control, with a command equal
programmed mode. They are power control and
to or greater than back 1/3. The bottom poten-
speed control. In the power control mode, the
tiometer is for EFFECTIVE ZERO. It is used to
pitch of the propeller is set to maximum. The
GTEs are operated at their lowest possible speeds.
adjust pitch to zero thrust, when operating in
The power mode is an open-loop, temperature-
programmed control, with a command of stop.
compensated mode using the torque computer in
TIME SET SECTION.--The last section of
the FSEE to maintain constant GTE loading.
this panel is the TIME SET section. It is used by
Power control is also used for low-noise
6-25
