TM 9-6115-730-10
200 kW TACTICAL QUIET GENERATOR SET
THEORY OF OPERATION
GENERAL
This work package contains functional descriptions of the generator set and explains how TQG functional systems interact
with one another.
ENGINE STARTING SYSTEM
The engine starting system consists of four 12-volt batteries connected in series and parallel, a 24 Vdc starter, a 24 volt
battery charging alternator, a magnetic pickup (for sensing engine speed) and the related switches and relays (described
below) required for control of the starting system. The PUSH TO STOP EMERGENCY STOP pushbutton on the EMCP will
automatically disable the starting system and shut down the TQG if it is pushed in. For engine cranking, battery power is
supplied to the starter motor through the starter solenoid which in turn is controlled by the EMCP. The starter engages the
engine flywheel causing the engine to turn over. As the engine accelerates above crank speed (sensed by a magnetic pickup),
the EMCP disengages the starter. The starting sequence may also be stopped by moving the ENGINE CONTROL switch on
the EMCP to COOL DOWN STOP. The engine may be cranked without starting using the DEAD CRANK switch. The
DEAD CRANK SWITCH is a three-position switch. Up position is CRANK, the center position is OFF, and the lower
position is NORMAL (operation). With the DEAD CRANK SWITCH in CRANK position, the starter motor is energized
without activating any other starting or control function. With the switch in the OFF center position, the system is off. With
the switch in the NORMAL (operation) position, the TQG will crank and start. The batteries are charged by the belt-driven
engine alternator. The belt-driven battery charging alternator also supplies GSC power. Normal operating indication
depends on the state of charge in the batteries. A low charge, such as exists immediately after engine starting, will cause
a high reading. Cold outside temperatures make starting the engine difficult. To improve engine starting in cold weather,
the engine contains an ether start. The ether start is described in the Air Intake and Exhaust System paragraph.
0003 00-1
