Table 5-1 shows the rpm and pitch relation-
ship over the range of the throttle lever. In the
The major difference between the
ahead direction, shaft rpm is held at 55 until
PACC ITC and the SCC ITC is that the
propeller pitch reaches 100 percent. After this
PACC ITC has provisions for pitch trim,
point, shaft rpm is increased and pitch remains
while the SCC ITC does not. Therefore,
at 100 percent. In the astern direction, shaft rpm
the two ITCs are not interchangeable.
is held at 55 until propeller pitch reaches 49 per-
cent. After this point, shaft rpm is increased and
This system is called ITC because the infor-
pitch remains at 49 percent.
mation for both pitch and rpm for an engine room
is given by one analog reference voltage. Two
references, one for each shaft, are generated by
each of the levers at the console (PACC or SCC)
that has control.
The propulsion local control equipment
(PLOE) is the engine room control equipment
on the DD- and CG-class ships. Two identical
PLOEs are on each ship, one in each engine
Table 5-1.--RPM-Pitch Relationship
room. PLOE No. 1 is located in MER 2, while
PLOE No. 2 is in MER 1. Each PLOE has two
units of which the major unit is the PLCC.
The second unit is the propulsion local control
electronics enclosure (PLCEE). This unit houses
the power supplies for the PLCC. Other than
on/off control, no operator functions are
available at the PLCEE.
The PLCC is divided into six panels and a
PLA and pitch control section. These panels are
the GTM B PANEL, the GTM A/B PANEL, the
GTM A PANEL, the SELF TEST PANEL, the
EOT PANEL, and the ALARM TEST PANEL.
Figure 5-14 shows the console's six panels and the
Figure 5-14.--PLCC--major sections.