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OM-2031
(2) Check electrical connections for looseness.
NOTE: A darkened terminal generally indicates a loose connection.
4. Electrical System (115-V AC)
The 400-Hz generator and controls are designed to be as maintenance free as possible. No lubrication is
necessary and no periodic maintenance adjustments are required. However, some regular checks should
be made to be sure all controls, instruments, etc., are working properly.
A. Monitoring Instruments
Observe operation of voltmeter, ammeter, and frequency meter each time the unit is started.
Item Protected
Instrument panel
lights & engine
circuit
Protective relay
system
Voltage regulator
Load contactor
circuit
B. Indicating Lights
Check lamps (bulbs) in all of the indicating lights at each start up. Fault indicating lights in the protective
relay tray may be tested by pressing test switch (1-1; 8, Fig. 8)
C. Protective Modules
Check operation of all protective modules to make certain they will function if a fault should occur in the
output circuit. (See 2-3; Para. 3, B.)
D. Wiring and Connections
(1) Check all cables, leads, and wiring for broken, worn, and damaged insulation.
(2) Check all connections for tightness.
WARNING: STOP OPERATIONS AND STOP ENGINE BEFORE TOUCHING EX-
POSED CONDUCTORS OR TERMINALS.
2-2
Page 4
Location
Illustration
Engine control
Sect. 1-1, Fig.9,
panel
item 13
Protective relay
Sect. 1-1, Fig.8,
tray
item 17
Voltage regulator
Sect. 1-1, Fig. 10,
item 12
Protective relay
Sect. 1-1, Fig. 8,
tray
item 16
Fuse Identification Chart
Figure 3
Size & Type
10A Type AGC
2A Type AGC
5A Type AGC
2A Type AGC
August 5/89 Revised
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