Filter
Top Products
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
• Moisture, dirt, metal particles, oil or other contaminants on
the insulated windings
• Wrong voltage
• Excessive temperature
• Voltage surges/lightning
• Mechanical damage
• Excessive vibration with resultant mechanical damage
• Single-phasing