Figure 6-1. Thermal watt converter (Al) test setup

T.O. 35C2-3-442-2

P-9-TM-457-35

TM 5-6115-457-34

TM-07464A-35

scale, high or low readings with the fre-

Voltage should be 120 10 percent vac, if

quency adjusting controls set in their nor-

not check wiring back to voltage source.

mal positions. To isolate the malfunction,

4. Connect a test frequency meter

proceed as follows:

(table 2-1) to the convenience receptacle

1. Loosen three captive studs and

or generator output terminal. Check panel

hinge control box door open.

frequency meter accuracy against test

meter while varying engine speed using

2. Start generator set and apply

manual speed control on utility generator

load.

sets or frequency adjust rheostat on pre-

cise generator sets. If meters do not in-

dicate the same, replace frequency meter

WARNING

and transducer.

Exercise extreme care not to touch

b. Removal. Refer to Operator and

exposed electrical connections when

Organizational Maintenance Manual and

working inside control cubicle with

remove the frequency meter and transducer.

generator set operating.

6-10. CLEANING. Clean the frequency

3. Measure input voltage to fre-

meter and transducer using a clean lint-

quency transducer (A2) at terminal 1 and 2.

6-3