ARMY TM 9-6115-639-13
AIR FORCE TO 35C2-3-386-51
MARINE CORPS TM 10155A-13/1
k. Power Inverter / Converter. The generator power inverter / converter (19, Figure 1-2) is located in
the skid base, between the control box and generator. The power converter consists of rectifiers, a power
inverter, and associated electronics. It provides the regulated 120VAC, 2 wire, or 120 / 240VAC, 3 wire (single
phase only) output. Voltage regulation is maintained within one percent, throughout specified voltage ranges,
from no load to rated load. An output control signal from the converter is connected to the governor control unit
to vary engine speed depending on load condition. This enables the generator set to operate at lower engine
speeds for light-load conditions while maintaining the required output voltage.
Fuel System. The generator set is equipped with a four-gallon fuel tank (1, Figure 1-4) which
provides enough fuel to operate the unit for eight hours at full load. The tank is mounted within the skid base.
The tanks filler assembly consists of a filler neck (2), fuel strainer (3), and vented fill cap (4). The tank
contains a fuel pick-up connection (5), fuel return connection (6), fuel drain connection (7), fuel-gap sending
unit (8), and fuel level switch (9).
An electric fuel pump (10) feeds fuel from the tank (1), through a combination fuel filter / water
separator (11), on to the engines fuel injection pump (12). The electric fuel pump (10) provides automatic fuel
system priming and bleeding. An electronic governor actuator is connected, by linkage, to the fuel injection
pump rack and is used for engine shutdown control.
An auxiliary fuel transfer pump (13) allows the generator set to operate using an auxiliary fuel source.
A fuel strainer (14) is provided between the auxiliary fuel input connection (15) and the transfer pump. The
transfer pump is controlled by the level switch, which allows fuel transfer from the auxiliary fuel source to the
generator set fuel tank (1). Auxiliary fuel operations are controlled by the AUX FUEL switch (located on the
generator set control panel). Refer to Paragraph 2-1, Operators Controls and Indicators, for a complete
explanation of each instrument and switch.
1-12. DIFFERENCES BETWEEN MODELS.
Generator set model MEP 831A is a 60 Hz generator set. MEP 832A is a 400 Hz generator set. In
addition, MEP 831A (60 Hz) is equipped with both a ground fault circuit interrupter (13, Figure 1-2) and a
convenience receptacle (15). MEP 832A does not contain these components.
1-13. EQUIPMENT DATA.
Refer to Table 1-2, Equipment Data, for a summary of specific capabilities, limitations, and critical data
for operation and maintenance of the generator set.
1-14. IDENTIFICATION AND INSTRUCTION PLATES.
Figure 1-5 illustrates all operating instruction plates, information / data plates, and warning / caution plates
found on the generator set.