TM 5-6115 400-12
Section IV. OPERATION OF GENERATOR SET
If an emergency situation requires continued
operation of the generator se the protection bypass
switch (fig. 2-6 (2)) can be used to override all
a. The instructions in this section are published for
safety devices except the overspeed and short
the information and guidance of the personnel
circuit. Lift over and push switch to ON position.
responsible for the operation of the generator set.
Push the switch to OFF position as soon as
possible after the emergency has passed.
b. The operator must know how to perform every
operation of which the generator set is capable. This
2-14. Operation Under Usual Conditions
section gives instructions on starting, stopping, single
and parallel operation of the generator set. Since nearly
every job presents a different problem the operator may
a. General. The generator set can be operated as
have to vary given procedures to fit the individual job.
a single unit or in parallel with other units of this model.
Do not operate the generator set
unless the ground terminal has been
a. Preparation for Starting.
connected to a suitable ground.
(1) Open the control panel doors and louver doors
Electrical faults in the generator set,
load lines, or load equipment can
(2) Perform the preventive maintenance checks
cause injury or electrocution from
contact with an ungrounded system.
(3) Make the necessary load connections to the
b. Single-Unit Operation.
(1) Determine the load voltage requirements and
position the voltage change board for the
Do not close the AC power circuit
c. Cold Weather Starting. For temperatures below
breaker until it has been determined
that the load is equal to or under the
rated capacity of the unit.
(3) Set the 50/60 cycle selector switch (fig. 2-6 (3))
Stopping by Safety Devices.
generator set is equipped with safety devices that will
automatically stop the engine in case of high coolant
temperature, low oil pressure, engine overspeed,
set as a single unit.
overvoltage, or no fuel. When one of these abnormal
c. Parallel Operation.
conditions occurs, an electrical circuit is broken by the
applicable safety device and this causes engine to shut
Generator sees to be operated in parallel
A short circuit, overload, undervoltage, or
reverse power protective relay will automatically open
rating. They must be connected for the
the AC power circuit breaker but will not stop the engine.
correct phase rotation.
regulation characteristics should be similar
and engines should have the same peed
(1) Connect the governor parallel cable between
units by plugging the cable into the parallel