Section II. DESCRIPTION AND DATA
DESCRIPTION OF GENERATOR SET.
This unit is a 5 kilowatt, 60 Hertz Generator Set. It consists
of a revolving field alternator powered by an air cooled diesel
See figures 1-1 and 1-2 for the location of major
components and figure 1-2.1 for generator with acoustic
suppression kit (ASK) installed.
(1) The engine powering this Generator Set is a
2 cylinder, 4 cycle air cooled engine, with a 70 cubic
tncb (cu. in) displacement. A mechanical governor
keeps engine speed at 1800 revolutions per minute
(RPM) under rated load conditions.
(2) Fuel is supplied either from this unit's self-
contained fuel tank or, by using an adapter, directly
from a 55 gallon drum or other source. The fuel is
filtered by two cartridge type fuel filters and a single
fuel strainer. Two electric, self-priming fuel pumps
pump fuel to the fuel injection pump which delivers
the fuel at high pressure to fuel injection nozzles in
the cylinder head. When auxiliary source of fuel is
used, three electric fuel pumps are Used.
(3) Two 12 volt wet cell battertes in series
supply power for a 24 volt electric starter and for
glow plugs, located in the cylinder head, and two air
heaters located in the intake manifold, used for cold
weather starting. An alternator located beneatb the
blower wheel and completely separate from the main
alternator automatically recharges these batteries
when the engine is operating.
The generator on this set is a four pole, revolving
field type. Alternating current, supplied by the exciter
assembly, is recitified and used to create the four
pole, revolving field. A solid-state voltage regula-
tor assembly automatically adjusts this current to ob-
tain a constant (±3%) voltage in the main stator (out-
All operator controls and indicator gauges necessary for
running the engine Generator Set are located on the
control panel. On ASK equipped generators, an oil
pressure gauge is located on the engine under air intake
door and a fuel level gauge is located on the fuel tank. The
speed control is located behind a small flap on the rear
panel assembly below the control panel.
Controls for selecting output voltage are located on
the output control box
d. Generator Set Electrical System (see schematic
(1) General. The generator set's electrical sys
tem consists of two distinct systems (1) the dc system
used primarily for operating control and excitation
and (2) the ac output system to supply power to the
The dc source consists of a 24 volt battery set (BT1
and BT2) that is kept charged by a battery charging
alternator (G2) and voltage regulator rectifier as-
sembly (A5). Fuse (F1) protects the alternator from
overload Circuit breaker (CB2) protects the battery
charging system from overload. Slave receptacle (J15)
permits an alternate external supply to be connected
to the battery circuit.
(2) Operation. Placing MASTER SWITCH (S1)
into the PREHEAT position, the preheat relay R2 is
activated to energize the heater elements (ER1 and
ER2) and the engine glow plugs (HR3 and HR4).
Placing the MASTER SWITCH in the PRIME-RUN-
AUXILIARY position activates the fuel pumps E2 and
E3 as well as the auxiliary fuel pump E1. If the fuel
level is down, the fuel level switch S3 will be closed
and the auxiliary fuel solenoid will actuate permit-
ting fuel to be pumped into the tank.
Placing the MASTER SWITCH (S1) into the PRIME-
RUN position maintains power to the main fuel pumps
but deactivates the auxiliary fuel pump.
(a) Start. Placing the MASTER SWITCH (S1)
into the start position maintains the fuel pump cir-
cuits and the preheat circuits to the glow plugs (HR3
and HR4) as well as to energize the governor sole-
noid K5) and start relay (K1). The crank relay
(K3) is eneregized, in turn energizing the start sole-
noid (K6) and activating the starter (B1). The gov-
ernor brings the engine to speed, building up oil
pressure and closing oil pressure switch (S5). The
exciter field is flashed during this starting procedure.
(b) Run. Placing the MASTER SWITCH (S1) in
the PRIME-RUN position keeps the governor solenoid
(K5) energized thru the now closed oil pressure switch
(S5)and fuel will be supplied to the engine as long as
the oil pressure is normal and the align temperature
switch (S4) is not activated by high temperature.
(c) Stop. Placing the MASTER SWITCH (S1) in
the OFF position de-energizes the governor solenoid
(K5) shutttng off fuel to stop the engine. High temper-
ature or low oil pressure will also shut the engine
(3) AC Circuitry. The main alternator (G1) is
wound with six pairs of coils that may be connected
by the AC Reconnect switch (S6) into various com-
binations, the output of which is available at the load
terminal board (TB1). Circuit breaker (CB1) protects
the alternator from overloads. The volt/ampere se
lect switch (S8) permits switching voltmeter (M5) and
ammeter (M4) to read the load current and voltage
for the various arrangement of outputs.
Voltage regulator (A2) and current voltage trans-
former CVT1 monitors the alternator output voltage
Change 7 1-2.1/(1-2.2 blank)