GE Custom 8000 Instructions Manual page 30

DLCGEEP-124-I/000, Approved, 2016-11-11, CampinasDM
Trouble
Noise or vibration
(cont'd)
Overheating
Bearings overheating
(journal type)
30 GE Industrial Control Systems GEEP-124-I
TROUBLE - SHOOTING CHART
Possible Cause
Misalignment
Air gap not uniform. (Machines
furnished without one bearing)
Noisy ball bearings
Loose on foundation
Foreign material inside unit
Shorted field turns
(synchronous)
Overloaded
Electrical load unbalance
Restricted ventilation
Incorrect voltage and frequency.
Stator winding shorted. (line-to-
line)
Stator winding ground.
(line-to-ground)
Incorrect field current
(synchronous)
Incorrect speed
Alignment
Copyright 1997,1998 The General Electric Company, USA
GEEP-124-I Horizontal Induction Motor
WPI, Antifriction Bearing
Check parallel, angular and axial
alignment.
Center the rotor.
Check lubrication. Replace bearings if
noise is persistent and excessive.
Realign machine. Tighten hold-down
bolts.
Clean inside for unit.
Check impedance
Determine if one pole has noticeable
difference.
Measure loading with ammeter and
compare with full load current on
nameplate. Reduce load.
Check for voltage unbalance or single
phasing.
Clean filters,
windings. Check water cooling if
applicable.
Check nameplate values with power
supply. Also check voltage at terminals
with machine under full load.
Inspect winding for damage. Obtain
expert help for repair.
Inspect winding for damage. Obtain
expert help for repair.
See nameplate - apply correct field.
Check speed, compare with nameplate.
Check parallel, angular and axial
alignment. Correct as required.
Action
of each pole.
air passages and