ARMY TM 9-6115-672-14
AIR FORCE TO 35C2-3-444-32
MARINE CORPS TM 09244A/09245A-14
1-20
1.16.4
Voltage Regulation System.
The Voltage Regulation System (Figure 1-21) consists of the automatic voltage regulator and power potential
transformer. The automatic voltage regulator senses and controls generator output voltage which is operator
adjustable within the design limits by use of the VOLTAGE ADJUST switch. The power potential
transformer provides operating power to the automatic voltage regulator module. Generator output voltage is
indicated on the CIM display screen.
1.16.5
Fuel System.
1.16.5.1
The Fuel System (Figure 1-22) includes a primary subsystem and an auxiliary subsystem.
1.16.5.2
The primary subsystem consists of fuel lines, fittings, fuel tank, fuel level sender, transfer pump, fuel
filter/water separator, injection pump, DCS speed control unit, and injectors. The injection pump includes a
24 VDC fuel shutoff valve.
1.16.5.3
The injection pump output is controlled by the DCS speed control unit and electric actuator. The DCS speed
control unit is energized whenever the ENGINE CONTROL switch is in the START position or either of the
two RUN positions. With the engine cranking or running, fuel is drawn from the fuel tank by the transfer
pump. After reaching the transfer pump, fuel passes through a fuel filter/water separator where water and
small impurities are removed. The fuel then goes to the injection pump. With the governor system energized,
the fuel is metered, pressurized and pushed through the injectors by the injection pump. Fuel is sprayed by the
injectors into the diesel engine combustion chambers where it is mixed with air and ignited. Fuel that is not
used by the injectors is returned to the fuel tank by an excess fuel return line. Power is removed from the DCS
speed control unit, and the fuel is shut off whenever the ENGINE CONTROL switch is set to the OFF
position. The DCS speed control unit is also de-energized by the fault system, paragraph 1.14.2. The CIM
display screen FUEL LEVEL indicator displays the fuel level of the fuel tank from E (empty) to F (full)
expressed as percent remaining.
1.16.5.4
The auxiliary subsystem consists of an auxiliary fuel supply, fuel lines, fittings, and an auxiliary fuel pump.
1.16.5.5
When the ENGINE CONTROL switch is set on PRIME & RUN AUX FUEL, it actuates the auxiliary fuel
pump and transfers fuel from the auxiliary fuel supply to the fuel tank. The CIM shuts off the auxiliary fuel
pump when the fuel tank is full and reactivates the pump as the level drops.
1.16.5.6
The 24 VDC control circuits provide control and power for indicators, fault system, DCS, and auxiliary fuel
pump.
1.16.6
Mechanical System.
1.16.6.1
The mechanical system provides protection from the elements, structural integrity, transportability, noise
suppression, and the cooling system for the generator set. The generator set cooling system is described
separately below.
1.16.6.2
The mechanical system consists of the housing, insulation, air baffles, and skid base.
1.16.6.3
The generator set housing is insulated to provide "tactical quiet" noise suppression which makes detection of
the generator set by it's audio signature more difficult under battle conditions. Air baffles allow for airflow to
cool the generator set with as little impact as possible to the generator set's noise output.
