GE Industrial Control Systems GEEP-124-I Copyright 1997,1998 The General Electric Company, USA
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GEEP-124-I Horizontal Induction Motor
WPI, Antifriction Bearing
TROUBLE - SHOOTING CHART
Trouble
Possible Cause
Action
Low insulation resistance
or insulation failure
Mechanical damage to insulation.
Obtain expert help for repair.
(cont’d)
Voltage surges have damaged
insulation.
Obtain expert help for repair
Excessive temperatures
Obtain expert help for repair
Wound rotor motor:
Motor runs at reduce
Excessive impedance between
unit and rotor control
Use adequately-sized conductors
speed wit external
resistance out of circuit.
Wrong Connections.
Check stator, rotor and exciter
connections, check control wiring.
Open circuit in rotor (including
cable to control).
Test by “ringing out” circuit and
repair.
Synchronous generator:
Failure of the machine to
Wrong connections
Check stator, rotor and exciter
connections, check regulator wiring.
produce rated output.
Open circuits
Test by “ring out” circuit and repair.
Prime mover
Check speed, run at rated speed.
Inadequate excitation
Check excitation. Compare with name-
plate and correct.
Shorted field turns
Impedance check all poles - determine
if one pole is noticeably less than
others.
Ground in field leads
Check lead insulation - check
condition where leads exit shaft.
Brushes sparking
Overload
Check for overload with ammeter and
eliminate overload. Clean rings, adjust
brush pressure and replace brushes.
Dirt between brush and ring
Clean rings, brushes and brush rigging.
Brushes stuck in holders
Use correct brushes, clean brush
holders.
Incorrect brush tension
Check brush tension and correct.
Rough collector rings
Stone or turn rings.
Eccentric rings
Turn rings or replace collector.
DLCGEEP-124-I/000, Approved, 2016-11-11, CampinasDM