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Trouble Shooting - Siemens 500 Installation Operation & Maintenance

Induction motors / generators horizontal - medallion 500, 580, 680, 800, 1120 frames tewac & teaac enclosures.
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Operation

Trouble Shooting

Between regular maintenance inspections, be
alert for signs of motor trouble.
symptoms are listed in the following table.
Correct any trouble immediately and AVOID
COSTLY REPAIR AND SHUT DOWN.
TROUBLE
Motor will not start.
Excessive hum.
Regular clicking.
Rapid knocking.
Vibration.
Vibration following motor
repair.
Motor overheating.
(Check with thermocouple
or by resistance method,
do not depend on touch).
Common
POSSIBLE CAUSES
Usually line trouble. Single phasing at
starter.
Under Voltage.
Excessive Load.
High Voltage.
Unbalanced rotor.
Excessive wear of sleeve bearings.
Foreign matter in air gap.
Bad anti-friction bearing or dirt in lubricant.
Misalignment in coupling or feet.
Accumulation of dirt on fan.
Vibration in driven machine.
System natural frequency (resonance).
Rotor out of balance; balance weights of
fans shifted on rotor.
Overload.
Single phase.
Dirt in motor.
Unbalanced voltage.
Rotor rubbing on stator.
Hazardous voltage.
Will cause death, serious injury,
electrocution or property damage.
Disconnect all power before working on
this equipment.
Check power source. DO NOT check with
motor energized! Check overloads, controls
and fuses. Check voltage and compare with
nameplate rating.
Check voltage at motor terminals. Compare to
nameplate.
Disconnect motor from load to see if it starts
without load. Reduce load or replace motor
with unit of greater capacity.
Check input voltage. Check for proper
connections.
Balance rotor.
Replace bearings. Check to determine cause
of wear and replace as necessary. Check
alignment.
Remove foreign matter.
Replace bearing, clean grease cavities and
renew lubricant.
Realign motor and driven equipment.
Clean motor.
Run motor disconnected from driven load and
check for vibration. Eliminate source in driven
equipment.
Alter rigidity of base structure.
Balance rotor.
Measure load and compare with nameplate
rating. Check for excessive friction in motor or
complete drive. Reduce load or replace motor
with unit of greater capacity.
Check current, all phases.
Check flow of air.
Check filters, if so equipped.
Clean motor.
Check voltage, all phases.
Check air gap. Repair motor as necessary.
- 11 -
DANGER
CORRECTION

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