TM 5-6115-590-12
CHAPTER 2
OPERATING INSTRUCTIONS
Section I. Operating Procedures
WARNING
If equipment fails to operate, refer to trouble-
shooting procedures in Chapter 4.
2-1. General
This section describes, locates, illustrates and provides
sufficient information about the controls and instruments
for proper operation of the power plant.
2-2. Gas Turbine Engine
Controls and Instruments
The purpose of the engine controls and instruments and
normal and maximum indications of the instruments are
described below The engine controls and instruments
are grouped in the lower left corner of the instrument
panel (see fig. 2-1).
a. Battery Charging Ammeter.
(1) Description. Dial pointer gauge, calibrated to
indicate -30 to +30 DC amperes in 1 ampere
increments.
(2) Purpose. To indicate the battery charging current
during operation of power plant.
(3) Indication. Battery charging current of about + 11
amps after initial engine start, charging current of + 2 to
+5 amps after a short period of power plant operation
b. Fuel Line Heater Circuit Breaker
(1) Description. A press-to-reset circuit breaker button
installed in the fuel line heater circuit.
(2) Purpose. Provide short circuit and overload
protection for a fuel line heater circuit. The circuit
breaker opening amperage (10 amps) is marked on the
reset button. (Use only with units with winterization kit
installed.)
c. Fuel Line Heater Indicator Lamp.
(1) Description. A filament type press-to-test lamp with
a red lens.
(2) Purpose. Illuminates to indicate that the fuel is
sufficiently warm for engine starting. (Use only with
units with winterization kit installed.
d. Fuel Heater Switch
(1) Description. A three position toggle switch.
(2) Purpose. To energize a fuel line heater circuit. (Use
only with units with winterization kit installed.)
e. Fuel Boost Pump Switch
(1) Description. A two position, solenoid-held, on-off
toggle switch.
(2) Purpose. Energizes the fuel boost pump to deliver
fuel to the engine fuel control unit at a constant pressure
(15 psig). Will trip to OFF position when master switch
is in RUN or START position.
f. Exhaust Gas Temperature Indicator.
(1) Description. Dial pointer gauge, calibrated to
indicate 0° to 1800°F m 100° increments to 900°F, 50°
increments from 900°F to 1500°F, and 1000 increments
from 1500°F to 1800°F The scale is colored green from
0° to 1225°F and red from 1225°F to 1800°F.
(2) Purpose. To indicate exhaust gas temperature in the
engine exhaust pipe during operation. (3) Indication.
Exhaust gas temperature shall not exceed 1260°0F
during engine acceleration or 1225°F during steady-
state operation at full load.
g. Ready to Load Indicator Lamp.
(1) Description. A filament type press-to-test lamp with
a green lens.
(2) Purpose. Illuminates to indicate that gas turbine
engine has accelerated to approximately 95 percent of
governed speed and is ready for application of load.
h. Emergency Operation Indicator Lamp.
(1) Description. A filament type press-to-test lamp with
a red lens.
(2) Purpose. Illuminates to indicate that the emergency
operation switch is on and that the power unit is
operating with protective devices bypassed.
i. Emergency Operation Switch
(1) Description. A two position on-off toggle switch A
red lockout guard is installed over the switch to prevent
accidental actuation of the switch.
(2) Purpose. Used in emergencies to bypass protective
devices, except overspeed switch, and permit continued
operation.
WARNING
The emergency operation switch must be in OFF
position, with the red lockout guard in the closed (down)
position. It should be used only in extreme emergencies
when need for continued operation justifies risk incurred
in loss of equipment, and possible injury to personnel
j. Master Switch.
(1) Description. A three position toggle switch, spring-
loaded return from the up (START) position to the
center (RUN) position
(2) Purpose. Energizes the engine power circuit and
provides a momentary start circuit until appropriate
holding relays are actuated to automatically
Change 5
2-1
