GE K-95352 Manuale Utente Scaricare il pdf (Pagina 23)

GEK-95352

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

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Sharp LC-60LE651E User Manual (2 pages)

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LC-60LE651E

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