ARMY TM 9-6115-643-24
AIR FORCE TO 35C2-3-445-22
control. A signal representative of the actual engine speed/generator frequency is sent to the electronic governor control
by the magnetic pickup. Any change in engine speed from that selected by the operator, as sensed by the magnetic pickup,
causes the electronic governor control to increase or decrease the fuel pump output to maintain the desired speed. The
load measuring unit senses changes in external load demand and provides a change signal to the electronic governor
control allowing the control to start its response prior to any actual change in engine speed. The generator set frequency
and power output are indicated by the FREQUENCY meter (HERTZ) and the kilowattmeter (PERCENT POWER) on the
control panel. The FREQUENCY SELECT switch is used to set the generator for 50 hertz or 60 hertz operating frequen-
cies (50 hertz/60 hertz sets only).
The electronic governor control also contains the engine overspeed switch (Fault System) and the crank dis-
connect switch (Engine Starting System). These switches function as a result of input from the magnetic pickup.
Twenty-four VDC power is supplied to the electronic governor control through the governor control power
relay. The governor control relay is controlled by the fault system. The electronic governor controls of two generator sets
operating in parallel are interconnected by the paralleling cable.
1.12.10 Voltage Regulation System.
The Voltage Regulation System (FIGURE 1 -11) consists of the voltage regulator, VOLTAGE adjust potentiometer,
and power transformer. The voltage regulator senses and controls the generator output voltage which is operator adjust-
able within the design limits by use of the VOLTAGE adjust potentiometer. The power transformer provides operating pow-
er to the voltage regulator. The output voltage is indicated by the AC voltmeter (VOLTS AC) on the control panel.
1.13 LOCATION AND DESCRIPTION OF MAJOR COMPONENTS.
N O TE
All locations (FIGURE 1-12) referenced herein are given facing the
control box side (rear) of the generator set.
Malfunction Indicator Panel (1). The malfunction indicator panel is located to the left of the control panel. It indi-
cates malfunctions of the generator set components.
Control Panel Assembly (2). The generator set control panel is located at the rear of the generator set and con-
tains controls and instruments for operating the engine and the generator.
1.13.3 Muffler (3). The muffler and exhaust tubing are connected to the exhaust manifold on the engine. The exhaust
exits from the top of the generator set housing. Gases are exhausted upward.
Skid Base (4). The skid base supports the generator set. It has fork lift access openings and cross members
for short distance movement. The skid base has provisions in the bottom for installation of the generator set on a trailer.
Fuel Filter/Water Separator (5). The fuel filter/water separator is located in the engine compartment on the right
side. The element removes impurities and water from the diesel fuel.
1.13.6 DEAD CRANK Switch (6). The DEAD CRANK switch is located in the engine compartment on the right side.
The switch allows the engine to be turned over without starting for maintenance purposes.
Oil Fitter (7). The oil filter is located in the engine compartment on the right side. The filter removes impurities
from the engine lube oil.
1.13.8 Voltage Reconnection Terminal Board (8). The voltage reconnection terminal board is located on the right side
(rear) of the generator set. The board allows reconfiguration from 120/208 to 240/416 VAC output.
Load Output Terminal Board (9). The load output terminal board is located on the right side (rear) of the genera-
tor set. Four AC output terminals are located on the board. They are marked L1, L2, L3, and L0. A fifth terminal, marked
GND, is located next to the output terminals and serves as equipment ground for the generator set. A removable, solid
copper bar is connected between the L0 and GND terminals.