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ELECTRICAL
Motors and Generators-Continued
Brushes set at improper angle
RING FIRE AND FLASHING ON COMMUTATOR:
Short or open circuit in armature coil
OVERHEATING:
Overload
Field or armature short circuit
Poor ventilation
Rotor off center
Unbalanced phase currents
Excessive field current
Line voltage too low
Bearing friction
SPEED TOO HIGH:
Weak field current
Prime mover speed too high
SPEED TOO LOW:
Overload
Low line voltage
Bearing friction
Dragging rotor
Prime mover speed too low
HUNTING ACTION:
Load variation
Variation in voltage frequency (unstable speed of prime mover)
7.2.16 Navigation Lights: Check for:
n Cable and Wiring:
dirty
poor ventilation
detrimental ambient conditions
presence of moisture, greases, oil or chemical fumes
damaged wiring devices
7-37
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