2. Fuel purge control
oil at the proper pressure and temperature to the
individual propulsion gas turbines.
3. Fuel falter monitoring
The following fuel oil service system control and
4. Main fuel valves control and monitoring
monitoring functions are available at the PACC:
5. Emergency trip fuel valve control
1. F u e l oil service tanks A/B temperature
GTE fuel oil controls available at the PACC pertain
monitoring
primarily to controlling the GTE fuel shutdown valves
2. Fuel oil service tank suction and recirculating
and emergency trip valves. Controls are also provided
valves control and monitoring
for fuel purging operations. Closure of either of the two
main fuel valves prevents fuel flow to the engine fuel
3. Fuel oil service booster pump A and B control
manifold. Control of these valves depends on the GTE
and monitoring
control mode: manual, manual initiate, and auto initiate.
4. P r e f i l t e r differential pressure monitoring
In the manual control mode, the main fuel valve
(CG-47 class only)
control signals to the free standing electronic enclosure
5. Header pressure and temperature monitoring
(FSEE) are generated by the push-button indicator on
the PACC. In the manual initiate and auto initiate control
6. Heater temperature monitoring
modes, the fuel valve control signals are automatically
7. Coalescer filter monitoring
generated by the start/stop sequence control logic.
8. Leak detection tank monitoring
The remaining GTE fuel oil controls available at the
PACC are related to fuel purging operations. If an engine
9. Suction strainer differential pressure monitoring
has been shut down for 15 days or longer, it may have
Monitoring functions are available at the PACC and
to be purged before starting. Purging is accomplished
the PLCC continuously, but control is available only at
by motoring the GTE with the fuel purge valve open.
one console at a time.
Depressing the FUEL PURGE ON push button at the
PACC control of the fuel oil service system consists
PACC opens the purge valve and allows fuel oil to flow
through the engine fuel lines and into the leak detection
of remote manual control of the suction and
tank. The purge valve can be opened only when the
recirculating valves associated with the two service
operator depresses the push button on either the PACC
tanks. The PACC also has automatic or remote manual
or PLCC.
control of the two fuel oil service pumps.
Valve control consists of open and close commands
Lube Oil System
to the valve motor controllers. Commands are applied
simultaneously to the suction and recirculating valves.
Each MER has its own separate and independent
Both valves associated with a service tank must be in
lube oil system that can be controlled and monitored
the same state (open or closed) for proper operation.
from the PACC. Monitoring is available continuously at
Separate control switches are provided to allow each
both consoles, but control is available at only one of the
service tank to be operated independently. Service tank
consoles at a time. Lube oil control available at the
monitoring consists of tank temperature high and low
PACC consists of manual and automatic control of the
alarms.
two lube oil service pumps. These pumps function to
augment the MRG attached lube oil pump.
The two service pumps can operate in manual or
automatic control mode. When the pump mode switch
If the pump controls at the PACC are to be enabled,
is set to MANUAL, the operator can use the push
the control location switch on the local controllers of the
b u t t o n s on the PACC to control the two pumps
pumps must be in the REMOTE position. Manual
individually. Setting the pump mode switch to either A
control of the two pumps is individually accomplished
with three push-button indicators. Setting the pump
LEAD or B LEAD position sets up the automatic control
mode auto/manual logic switch to MANUAL allows
circuits to select a lead pump and a standby pump. Pump
operator control of pump speed. The push-button
control is then a function of header pressure and time.
indicator causes the associated command to be relayed
The following GTE fuel oil control and monitoring
to the PLCC circuitry and then to the pump motor
functions are available at the PACC:
controller. Setting the pump mode switch to either the
A LEAD or B LEAD position sets up the automatic
1. Supply temperature monitoring
3-12
