GE Verticle Induction Motor GEK-95352 User Manual
GEK-95352
23
VII. TROUBLE SHOOTING CHART
Affected Parts
Difficulty
What to Check
Windings
Overheating
•
Calibration of measuring instrument
•
Excessive
load
•
Unbalance a-c current
•
Improper or restricted ventilation
•
Excessive
ambient
temperature
•
Short circuited coil or windings
•
Dirty
windings
•
Unbalanced
voltage1
•
Harmonics power supply (Variable Frequency Control)
•
Fan
broken
Bearings
Overheating
•
Calibration of measuring instrument
•
Worn out or dirty oil
•
Insufficient oil
•
Misalignment
•
Excessive thrust or radial loading
•
Shaft currents
•
Insufficient cooling water
•
Improper
end-play
•
Insufficient down-thrust (on SRB)
•
Fan
broken
Bearing Housing
Oil Leaks
•
Incorrect grade of oil (type or viscosity)
•
Loose
fittings
•
Cracked/porous
casting
•
Over-filled
•
Water in oil
Motor
Excessive Vibration
•
Unbalance
•
Misalignment
•
Improper or settled foundation
•
Non-uniform air gap
•
Rubbing
parts
•
Bent
shaft
•
Unbalanced stator current
•
Damaged
bearings
•
Reed
critical
•
Incorrect
end-play
•
Fan
broken
Motor
Failure to Start
•
Wrong
transformer
taps
•
Wrong
connections
•
Open
circuit
•
Excessive line drop (low voltage at motor)
•
Excessive
load
•
Rotor
rubs
•
Wrong direction of rotation
Insulation
Low Insulation resis-
tance or insulation
failure
tance or insulation
failure
•
Moisture, dirt, metal particles, oil or other contaminants on
the insulated windings
the insulated windings
•
Wrong
voltage
•
Excessive
temperature
•
Voltage
surges/lightning
•
Mechanical
damage
•
Excessive vibration with resultant mechanical damage
•
Single-phasing