P-9-TM-457-35 T.O. 35C2-3-442-2
TM-07464A-35 TM 5-6115-457-34
CHAPTER 6
GENERATOR SET CONTROL GROUP REPAIR INSTRUCTIONS
Section I. CONTROL CUBICLE
6-1.
GENERAL.
Devices that control the engine are a
START-RUN-STOP switch S2 and an engine
The control cubicle is located at the
primer switch S1. Also included is an
generator end of the set. It contains con-
engine air cleaner condition indicator DS8.
trols, switches, instruments, and circuitry
necessary to start, operate, and monitor
c. Located in the control cubicle are
the generator set. The instruments and
the thermal watt converter Al, control
controls are mounted on a hinged front
panel of the cubicle which permit easy ac-
transducer A2, control box relay assem-
cess to the interior of the cubicle. Devices
bly, and a wire harness. The thermal
on the front panel are divided into an engine
watt converter senses the generator power
group and a generator group.
output and converts it to a proportional dc
signal for display by the kilowatt meter.
a. Instruments that monitor the genera-
The frequency meter and transducer are a
tor output are: frequency meter M6; kilo-
matched set. A single phase ac voltage of
watt meter M7; percent rated current meter
the generator output is applied to the trans-
M8; ac voltmeter M9; ammeter-voltmeter
ducer which produces dc signal proportion-
selector switch S8; and the synchronizing
al to the generator frequency for display by
lights DS4 and DS5. Devices that control
the frequency meter. The control box
the generator output are: a frequency ad-
relay assembly contains stop-run relay K1,
just rheostat R1 for precise sets; a voltage
remote voltage sensing relay K6, rectifier
adjust rheostat R2; parallel unit - single
bridge CR1, and resistor R10.
unit operation switch S6; battle short
switch S7 and indicator DS7; voltage sens-
THERMAL WATT CONVERTER
6-2.
ing (remote-local) switch S5; and ac load
(A1).
contactor switch S3 and indicator DS6.
TEST ON EQUIPMENT.
Utility generator sets utilize a manual
6-3.
speed control located adj scent to the con-
trol cubicle, for adjustment of frequency
a. Symptoms and Isolation of Malfunc-
through the utility governor.
tion. A malfunction of the thermal watt
converter is usually indicated by low or no
b. Instruments that monitor engine
kilowatt meter reading. An open circuit
operation are: oil pressure meter Ml;
coil in the thermal watt converter will also
coolant temperature indicator M2, fuel
effect the AC ammeter reading for the
level meter M3, battery charge ammeter
phase which is open. To isolate the mal-
function, proceed as follows:
M4, and total running time meter M5.
6-1
