Carrier 69GN15-114 Operation And Service Manual page 17

3.3 A--- C BRUSHLESS GENERATOR (MAIN ALTERNATOR)
INDICATION/
TROUBLE
No voltage
Low voltage
Fluctuating voltage
(May be indicated by
flickering lights)
High voltage
Overheating
Mechanical Noise
Generator frame
produces shock
when touched
POSSIBLE CAUSES
Loss of residual magnetism in exciter field
Circuit breaker tripped
Open in stator windings
Open or short in rotating rectifiers
Short circuited
Open in alternator field
Shorted exciter armature
Low engine speed
Excessive load
High resistance connections --- connections
warm or hot
Shorted field
Fluctuating speed
Irregular speed of engine
Loose terminal or load connections
Defective bearing causing uneven air gap
Excessive engine speed
Generator overloaded
Clogged ventilating screens
High temperature surrounding generator
Insufficient circulation
Unbalanced load
Dry bearing
Defective bearing
Rotor scrubbing on stator
Loose laminations
Loose or misaligned coupling
Static charge
Grounded armature of field coil
3---4
REFERENCE
PARAGRAPH
4.6.1.g
Check
4.6.2
4.6.1.c
4.6.2
4.6.2
4.6.2
4.3.4
Check
Tighten
4.6.2
4.3.4 or
Engine Manual
Tighten
4.6.1.b
4.3.4
Check
Clean
4.3.1
4.3.1
Balance
4.6.1
4.6.1
4.6.1
4.6.2
4.6.2
Check ground
to frame
4.6.2