mode and the PROPULSION MODE is set in the
MODE SETTING AND REDUCTION GEAR
SPEED mode. When the rough weather damping
MONITORING SECTION.--This section (D) is
circuit is used, the processor attempts to even out
located to the right of the shaft performance
PLA actuator command signals during rough sea
section and is used to set propulsion modes and
conditions. This is to reduce hunting (fluctuation)
programmed control locations and to monitor the
reduction gear bearings.
of the propeller srpm.
The next section has 29 LEDs to monitor
The first control switch is used only in
reduction gear bearing high temperature, one
programmed mode and is labeled PROPULSION
for each bearing in the MRG and the line shaft
MODE. This switch has two positions, POWER
bearing. Associated with each LED is a number,
and SPEED. When placed in the POWER
1 to 29; placing zeros in front of these numbers
position, the processor automatically adjusts
makes three-digit numbers. You will then have the
the pitch and PLA commands to provide a
DDI number for that bearing. If you use these
consistent load on the GTE. To do this, the
numbers as reference numbers, 1 to 26 are for the
processor uses the torque computer. At powers
babbitt bearings; the sensors are in the babbitt and
above full pitch, an almost linear relationship
between the position of the programmed control
are sensing babbitt temperature. Numbers 27 and
28 are for the thrust bearings; number 29 is for
lever and steady state srpm exists. In the power
the line shaft bearing.
mode, the GTE or GTEs are kept at a steady
Under the control switches is an indicator
power level. In some sea states and/or under some
labeled PROGRAMMED CONTROL FAILURE.
maneuvering conditions, the srpm will vary above
This indicator illuminates and sounds an alarm
or below a normal value. This variation in the
when the processor has failed or has not made
power mode is normal and expected.
a complete cycle and has stopped. If this occurs,
The other position of the PROPULSION
the processor will have to be restarted. Until the
MODE switch is the SPEED mode. When
processor is restarted, the DDIs and the loggers
operating in the speed mode, the processor
may not be operating properly.
automatically adjusts the propeller pitch signals
The next indicator is labeled PILOTHOUSE
and the PLA actuator signals to provide a
IN PROGRAMMED CONTROL. When this in-
constant propeller srpm. To do this, the processor
dicator illuminates, the control of the propulsion
uses built-in power schedules and propeller srpm
system is at the pilot house.
feedback. The programmed control lever gives the
operator fine control of srpm. The operator can
Below the PROGRAMMED CONTROL
FAILURE indicator is a two-position PRO-
make careful adjustments to ship's speed in
GRAMMED CONTROL LOCATION switch. It
relatively calm seas and during alongside
determines the location of the programmed
evolutions.
control. The programmed control location rotary
Just to the right of the propulsion mode switch
switch, when positioned to CCS, shows that the
is the ROUGH WEATHER DAMPING switch.
control of the programmed mode is at the PCC.
This is an ON/OFF switch. This switch is only
The other switch position is PILOTHOUSE. With
operative when operating in programmed `control
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