Section IV. OPERATION UNDER USUAL CONDITIONS
2-14. Operation of Equipment.
a. Instructions in this section are provided for
information and guidance of personnel responsible
for operation of the engine generator set.
b. The operator must know how to perform every
operation of which the engine generator set is capable.
This section gives instructions on starting and stop-
ping the engine generator set, operation of the gener-
ator set and coordinating the basic motions to perform
the specific tasks for which the equipment is de-
signed. Since nearly every job presents a different
problem, the operator may have to vary procedures
to fit the individual job.
a. Preparation for Starting. Instructions to be
followed when preparing to start the engine genera-
tor set are shown in figure 2-6. Preventive main-
tenance procedures to be performed before opera-
tion are given in table 3-1.
b. Starting. After performing the preparation
for starting procedure of paragraph 2-12a, start the
engine generator set as shown in figure 2-7. If the
engine will not start or if any other abnormality is
observed, notify organizational maintenance
a. Normal Stopping. (See figure 2-8). Preventive
maintenance procedures to be performed after equip-
ment operation are given in table 3-1.
b. Stopping by Safety Devices. The engine gen-
erator set is equipped with safety device electrical
circuits that will automatically stop the engine and
simultaneously open the main ac contactor in case
of; (1) high coolant temperature, (2) low oil pressure,
(3) engine overspeed, (4) over-voltage or, (5) no fuel.
A short circuit, overload, or reverse power protec-
tive relay will automatically open the main ac con-
tactor but will not stop the engine. On precise class
1 engine generator sets only, under voltage and under
frequency relay protective circuits will similarly
open the main ac contactor but will also not stop the
A specific FAULT INDICATOR (fig. 2-5)
will light when any of these abnormal conditions occur.
Refer to table 2-2 for the specific criteria for which
these safety device electrical circuits operate. Once
the engine generator set has been stopped due to the
action of one of these safety devices, the problem
must be corrected before the engine generator set is
placed back in operation.
Emergency Stopping. To stop the engine
generator set in an emergency, open DC CONTROL
CIRCUIT BREAKER (fig. 2-8).
a. Single Engine Generator Set Operation.
See-fig. 2-9 for single engine generator set operating
b. Parallel Operation of Engine Generator Sets,
See-fig. 2-10 for parallel operation instructions for
up to 3 engine generator sets of the same class,
mode and size.
c. Emergency Operation. If any emergency
situation requires continued operation of the engine
generator set after being shut down by one of the
safety device electrical circuits (para 2-13 b), the
BATTLE SHORT switch (fig. 2-7) can be used to
override all safety devices except the overspeed and
short circuit operation of this switch is as follows:
(1) Place BATTLE SHORT switch in OFF
(2) Hold START-RUN-STOP switch in START
POSITION and start engine (fig. 2-7).
(3) Lift cover and push BATTLE SHORT
switch to ON position.
(4) Release START switch and push BATTLE
SHORT switch to OFF position as soon as possible
after emergency has passed.
The BATTLE SHORT switch
may be actuated, as necessary,
any time the engine generator
set is operating.
Load Connections for Parallel Op-
Prior to attempting parallel operation,
ensure all generator sets have the same
frequency and voltage output.
Lethal voltages are present at the load
terminal board of the generator set
Do not attempt to
connect or disconnect load leads while
the generator set is operating. Do not
attempt to connect or disconnect load
leads with the generator set shut down
and the load connected to another power
2-18 Change 12