ARMY TM 9-6115-643-24
AIR FORCE TO 35C2-3-445-22
Applying the Load. The load is applied by placing the AC CIRCUIT INTERRUPTER switch in the CLOSED
position. This is a momentary contact switch that returns to the neutral, or center position. The AC circuit interrupter relay
is energized by this momentary contact and a holding circuit keeps it closed, bringing the load on line.
The AC circuit interrupter relay is disengaged by placing the AC CIRCUIT INTERRUPTER switch in the
OPEN position. This is a momentary contact switch which will break the AC circuit interrupter relay holding circuit and
then return to the neutral, or center position, disconnecting the load from the line.
When the MASTER SWITCH is placed in the OFF position all power is removed from the control circuit
and the engine will stop.
The EMERGENCY STOP switch will remove power from the control circuit by energizing the engine fault
relay. This will cause the engine to shut down. The EMERGENCY STOP switch is not to 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 MASTER SWITCH is placed in the OFF position.
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, the LOAD SHARING ADJUST and
REACTIVE CURRENT ADJUST rheostats, two SYNCHRONIZATION LIGHTS, the UNIT-PARALLEL switch, reverse
power relay, voltage sensing relay, droop current transformer, and the permissive paralleling relay.
The paralleling cable is used to interconnect the governor and voltage regulator paralleling circuits of the
two sets. The UNIT-PARALLEL switch is used to select parallel operation. Voltage and frequency of the two generator
sets are synchronized by adjusting each sets VOLTAGE and FREQUENCY controls. Phase synchronization is indicated
by the SYNCHRONIZATION LIGHTS. The reverse power relay serves as a safety device by detecting any excessive
out-of-phase condition and interrupting power to the AC circuit interrupter relay holding coil when that condition occurs.
The permissive paralleling relay monitors the voltage phase relationship and prevents the AC circuit interrupter relay from
closing when the units are not properly synchronized.
Governor Control System.
The Governor Control System (FIGURE 1 -10) includes the electronic governor control, governor actuator,
magnetic pickup, load measuring unit, frequency transducer, FREQUENCY meter (HERTZ), kilowatt transducer, fuel in-
jection pump, FREQUENCY SELECT switch, and FREQUENCY adjust potentiometer.
The governor actuator is a linear electromechanical actuator which controls the output of the fuel injection
pump in response to the electrical input from the electronic governor control. The FREQUENCY adjust potentiometer,
located on the control panel and adjusted by the operator, provides a signal representing the desired engine speed/gener-
ator frequency to the electronic governor