ARMY TM 9-6115-671-14
AIR FORCE TO 35C2-3-446-32
MARINE CORPS TM 09249A/09246A-14A
1-34
1.16.13.2
Field Flash. This circuit provides current to the exciter field windings which sets up an electromagnetic
field. The field current is necessary for the set to generate sufficient voltage for the automatic voltage
regulator to begin controlling the output voltage of the generator set. The field flash circuit is
maintained until the ENGINE CONTROL switch is released from the START position.
1.16.13.3
Operation. Placing the ENGINE CONTROL switch in the PRIME & RUN AUX FUEL positions
keeps the DCS speed control unit energized, and fuel will be supplied to the fuel injection pump as
long as no fault condition exists. During operation, the operator should periodically check the CIM
display screen to ensure readings are in normal operating ranges. The VOLTAGE ADJUST and
FREQUENCY ADJUST switches are adjusted as required to maintain desired frequency and voltage
output.
1.16.13.4
Applying the Load. The load is applied by placing the AC CIRCUIT INTERRUPT switch in the
CLOSED position. This is a momentary contact switch that returns to the neutral, or center, position.
The AC circuit interrupter is energized by this momentary contact and a holding circuit keeps it closed,
bringing the load on line.
1.16.13.5
Shutdown.
1.16.13.5.1 The AC circuit interrupter is disengaged by placing the AC CIRCUIT INTERRUPT switch in the
OPEN position. This is a momentary contact switch which will break the AC circuit interrupter
holding circuit and then return to the neutral, or center, position, disconnecting the load from the line.
1.16.13.5.2 The generator set should remain running for five minutes after disconnecting the load. During this five
minute interval, oil circulates through the turbocharger, cooling it enough to be shut down.
1.16.13.5.3 When the ENGINE CONTROL switch is placed in the OFF position, all power is removed from the
governor control circuit and the engine will stop.
1.16.13.5.4 The EMERGENCY STOP switch will remove power from the governor control circuit by de-
energizing circuitry in the DCS. This will cause the engine to shut down. The EMERGENCY STOP
switch will not be used as an alternative for routine shutdown procedures. When the generator set is
stopped using the EMERGENCY STOP switch, some circuits remain energized causing a drain on the
batteries until the ENGINE CONTROL switch is placed in the OFF position.
1.16.13.6
Paralleling.
1.16.13.6.1 The generator set is capable of being operated in parallel with one other set of the same model number.
This capability is provided by the PARALLELING RECEPTACLE, paralleling cable, and the load
sharing synchronizer.
1.16.13.6.2 The paralleling cable is used to interconnect the governor and automatic voltage regulator paralleling
circuits of the two sets. Voltage and frequency of the two generator sets are synchronized by the DCS
load sharing synchronizer. The permissive paralleling relay monitors the voltage phase relationship and
prevents the AC circuit interrupter from closing when the units are not properly synchronized.
