GE Energy Motors GEEP-427-I Copyright 2009, The General Electric Company, USA
21
GEEP-427-I Pegasus, Horizontal Induction Motor
TEWAC, Sleeve Bearing
Maintenance - General
General
The machine covered by this Instruction Manual
has been designed with reliability and utility as goals. It
is constructed of high quality materials. If it is installed,
operated and maintained in accordance with the
instructions in this manual, it can be expected to give
many years of trouble-free service.
Importance of a Maintenance
Program
The purchase and installation of a large electric
machine represents a significant capital investment
which should be protected by a thorough maintenance
program. This program should include the machine as
well as the protective and control equipment.
A maintenance program is based on four
concepts: (1) maintaining cleanliness, (2) periodic
inspection, (3) keeping adequate records, and (4) taking
corrective action on a timely basis. Periodic inspection
provides the system and discipline for maintaining
cleanliness as well as assuring that parts are functioning
properly. The frequency of periodic inspections can vary
from several per day for such items as winding
temperature readout (if printout and/or automatic
shutdown control is not provided) to once per month for
a general inspection on the interior of the unit. The
keeping of accurate records is necessary to maintain a
history of the unit and to provide a procedure for
checkoff and verification of the various items. If a
problem is encountered, whether it be a minor and a
frequently encountered problem, such a cleaning, or a
significant problem such as increased vibration levels, it
should be corrected as quickly as possible after
determining its need. If the unit should require
significant repairs in the course of its life, it is
recommended that they be done in a General Electric
Service Shop.
WARNING:
BEFORE INITIATING
MAINTENANCE PROCEDURES, DISCONNECT
ALL POWER SOURCES TO MACHINES AND
ACCESSORIES. FOR MACHINES EQUIPPED
WITH SURGE CAPACITORS, DO NOT
HANDLE CAPACITOR UNTIL DISCHARGED
BY A CONDUCTOR SIMULTANEOUSLY
TOUCHING ALL TERMINAL AND LEADS,
INCLUDING GROUND. THIS DISCHARGE
CONDUCTOR SHOULD BE INSULATED FOR
HANDLING.
REPLACE ALL GROUNDING CONNECTIONS
PRIOR TO OPERATING.
FAILURE TO OBSERVE THESE PRECAUTIONS
MAY RESULT IN INJURY TO PERSONNEL.
Importance of Cleanliness
The location of the connected equipment will
necessarily determine the location of the machine.
Accordingly, considerable variation between different
applications and between different sites will be
encountered. To a significant degree, the choice of the
enclosure will compensate for variations in environment,
particularly for moisture and weather conditions.
However, the preservation of cleanliness of the
ventilating inlet and outlet openings, air ducts, winding,
space heaters, accessory connection blocks, etc., is
essential.
Ventilating air will bring environmental
contamination to the active parts of an ambient ventilated
machine. Properly maintained air filters will significantly
reduce the amount of particles in the air, but cannot
totally eliminate them. Totally-enclosed type enclosures
will greatly, but not completely, reduce the interchange
of external environmental air and internal recirculating
air.
Dirt particles, entrained in the ventilating air, tend
to accumulate in air ducts and on the surface of the
windings. This accumulation will have adverse effects
such as an increase in operating temperature, decrease in
insulation resistance and more rapid deterioration of the
insulation. Dirt particles in the lubricating oil or grease
supply will cause more rapid bearing wear and even
bearing failure. Acid and alkali vapors can, over a period
Summary of Contents for Pegasus MHV GEEP-427-I
Page 46: ...GE Energy Motors 46 ...
