Flowserve 6LR-18A - Operational Difficulties

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