GEI 56128-L
© Copyright 2016 General Electric Company
14
VI.
OPERATIONAL DIFFICULTIES
Some operating difficulties may occur. Common causes are given in Table 2 and should be corrected as soon as possible.
TROUBLESHOOTING CHART
Table 2
Affected Parts
Difficulty
What to Check
Windings
Overheating
Calibration of measuring instrument
Excessive Current
Unbalanced AC current
Improper or restricted ventilation
Excessive ambient temperature
Short circuited coil or windings
Dirty windings
Unbalanced voltage
Bearings
Overheating
Calibration of measuring instrument
Worn out or dirty oil *
Rough journal *
Oil rings jammed *
Insufficient Oil *
Misalignment
Excessive end thrust or radial loading
Shaft currents
Excessive or insufficient grease **
Worn out or dirty grease **
Motor
Excessive Vibration
Unbalance
Misalignment
Improper or settled foundation
Non-uniform air gap
Rubbing parts
Bent shaft
Unbalanced stator current
Damaged bearing
Winding Insulation
Low insulation resistance
or insulation failure
Moisture, dirt, metal particles, oil, or other contaminants on the
windings
Wrong voltage
Excessive temperature
Voltage surges
Mechanical damage
Excessive vibration with resultant mechanical damage
*
Sleeve bearings
**
Anti-friction bearings
