P-9-TM-457-35
T.O. 35C2-3-442-2
TM-07464A-35
TM 5-6115-457-34
1. Loosen three captive studs and
6-5. INSPECTION. Inspect case for evi-
hinge control box door open.
dence of cracks or tears and the terminal
board for cracked insulation, stripped
2. Start generator set and apply
threads, and missing jumper strips.
load.
6-6. TEST. Connect the thermal watt
converter to the test equipment as illustra-
ted in figure 6-1 and proceed as follows:
Exercise extreme care not to touch
exposed electrical connections when
Note
working inside control cubicle with
generator set operating.
All test readings are 20 percent.
3. Measure input voltages at ter-
a. Adjust all autotransformers T1, T2,
and T3 to their MIN positions.
minals V1-N1, V2-N2 and V3-N3. Voltage
should be 120 VAC with the generator out-
put voltage adjusted for rated output. If
b. Close switch S1 and open switches
above requirement is not met, check wiring
S2 and S3.
back to voltage source.
c. Energize the power source.
4. Measure current to terminal L1,
L2, and L3. The current should vary be-
d. Adjust T1 until 1 ampere is indicated
tween 0-0 75 AC amperes as the generator
dicate 6.4 mv.
set load is varied from 0 to 100 percent of
rated output. If there is no current shut
e. Close switch S2 and adjust T2 until
down generator set and check for continuity
1 ampere is indicated on ammeter A2.
between terminals L1-S1, L2-S2 and L3-
S3. If there is continuity, check wiring
Voltmeter V1 should indicate 13 mv.
back to current source.
f. Close switch S3 and adjust T3 until
1 ampere is indicated on ammeter A3.
5. Measure the output signal at the
(+) and (-) terminals with a vacuum tube DC
Voltmeter should indicate 18.6 mv.
voltmeter. The output signal should vary
g. Remove test equipment. Replace
between 0 to 10.4 mv as the generator set
defective thermal watt converter.
load is varied between 0 and 100 percent of
rated output, If the above requirement is
6-7. INSTALLATION. Refer to Operator
not met and the inputs' are correct, the
and Organizational Maintenance Manual and
thermal watt converter should be replaced.
install the thermal watt converter.
b. Removal. Refer to Operator and
FREQUENCY METER (M 6) AND
6-8.
Organizational Maintenance Manual and re-
TRANSDUCER (A2).
move the thermal watt converter.
6-9. TEST ON EQUIPMENT.
6-4. CLEANING. Clean the thermal watt
a. Symptoms and Isolation of Malfunc-
converter using a clean lint-free cloth,
tion. A malfunction of the frequency meter
moistened with an approved cleaning solv-
or transducer is usually indicated by off
ent and dry thoroughly.
6-2
