MAINTENANCE OF CONTROL CUBICLE
5-1. GENERAL. The control cubicle is located at the
rear (generator end) of the generator set. It contains
two control panels, the engine control panel, and the
generator control panel. These instruments, and other
equipment necessary to start, operate, and monitor the
generator set. The control cubicle is removable from
the generator set as a single unit.
MAINTENANCE LOCKOUT SWITCH TO
LOCKOUT. DISCONNECT NEGATIVE
CABLE FROM BATTERIES. REMOVE
CB101 (EXTERNAL POWER CIRCUIT
POWER CABLE FROM RECEPTACLE
J101 (120V RECEPTACLE).
5-2. TRANSDUCERS A103, A107, AND A108.
Transducer A103 is mounted on the rear panel of the
control cubicle enclosure (31, figure 5-1, sheet 1).
Transducers A107 and A108 (thermal watt converters,
82, figure 5-1, sheet 2) are mounted at the base of the
Remove transducers A107 and A108
according to paragraph 5-2 b and test
HIGH VOLTAGES PRESENT DURING TEST.
OR SEVERE BURNS MAY RESULT IF
PERSONNEL FAIL PRECAUTIONS
A107 or A108) as shown in
figure 5-2, using test equipment
Adjust T1, T2, and T3 to their
minimum position, fully counter-
Close S1 and open S2 and S3.
phase, 4 wire, 60 Hz power
Adjust T1 until 0.7 ampere is
indicated on ammeter A1. At
this point, the percentage of
RATING METER shall indicate
With S1 closed, close switch
S2, and adjust T2 until 0.7
ammeter A2. The percentage
indicate 66 percent.
With S1 and S2 closed, close
S3. Adjust T3 until 0.7 ampere
is indicated on ammeter A3.
The percentage of RATING
If requirements of steps (e), (f),
and (g) are not met, replace the
Transducers A103. This transducer
and generator set frequency meter
are a matched set, and must be
tested as a set. Refer to the
remove frequency meter from the
generator panel of the control cubicle.
Connect a test setup as shown
in figure 5-3.
Vary the frequency from lowest
reading at 120 volts and at
frequencies between 48 and 53
Hz, the generator set meter
shall read within 1 percent of
the generated frequency (to the