free cloth, moistened with unapproved
cleaning solvent and dry thoroughly.
6-11. INSPECTION. Inspect the frequency
meter and transducer cases for cracks or
tears and the electrical connectors for bent
pins and insulation breakdown.
The frequency meter and transducer
are a matched set and must be tested
as a set.
a. Connect a variable frequency 120
the frequency transducer as shown in figure
b. Connect a reference frequency meter
across the input. The master frequency
meter shall have 5 times the accuracy of
(1/20 of 1 percent).
c. Vary the frequency from lowest
scale reading to full scale reading.
d. The error at any point on frequency
Figure 6-2. Frequency meter (M6) &
meter shall not be greater than 1/4 of 1
transducer (A2) test setup
relay assembly (A4) is usually indicated by
e. Remove test equipment. Replace
start- run-stop switch (S2) is positioned to
defective frequency meter and transducer.
RUN or by inability to control voltage from
a remote location. To isolate the mal-
6-13. INSTALLATION. Refer to Operator
function proceed as follows:
and Organizational Maintenance Manual
1. Loosen three captive studs and
hinge control box door open.
CONTROL BOX RELAY ASSEMBLY
Exercise extreme care not to touch
TEST ON EQUIPMENT.
exposed electrical connections when
working inside control cubicle with
a. Symptoms and Isolation of Malfunc-
generator set operating.
tion. A malfunction of the control box