GEI-56128H
10
10. Space heaters should be de-energized
during motor operation.
11. Check the operating current against the
nameplate value. Do not exceed the value of
nameplate current multiplied by the motor service
factor (if any) under steady continuous load.
C. Jogging and Repeated Starts
CAUTION
:
Repeated starts and/or jogs of
induction motors greatly reduce the life of
the winding insulation.
The heat produced by each acceleration or jog is
much more than that dissipated by the motor
under full load. If it is necessary to repeatedly start
or jog a motor, it is advisable to check the
application with the local GE Energy sales office.
V.
MAINTENANCE
WARNING
:
Before
initiating
maintenance procedures, disconnect
all power sources to the motor and
accessories. For motors equipped with surge
capacitors, do not handle the capacitors until they
are discharged by a conductor simultaneously
touching all terminals and leads, including earth.
This discharge conductor should be insulated for
handling. Replace all normal grounding
connections prior to operating
.
A.
General
If the motor is dismantled during maintenance, sealing
compounds (if any) shall be removed from machined
rabbets (spigots). When reassembling the motor, all
machined surfaces forming metal-to-metal joints
should be sealed with watertight sealing compound
(Tite-Seal, GE Spec. A50CD427A or equivalent)
.
Inspect the motor at regular intervals, depending on
service. Keep the motor clean and the ventilation
openings clear.
In addition to the daily observation of the overall
condition, it is recommended that a general inspection
routine be set up to check periodically the following
items:
1. General cleanliness
2. Insulation and windings
3. Lubrication and bearings
B. General Cleanliness
The interior and exterior of the motor should be kept
free from dirt, oil and grease and conducting dust.
Paper, textile or dusts may build up and block off
ventilation. Any of these contaminants can lead to
early motor failure.
C.
Division 1 Explosion Proof Motors
Division 1 Explosion-proof motors have special
features and are manufactured in accordance with UL
and carry its label. Therefore, repairs need to be made
at a GE Service Shop, which has been authorized to
make such repairs.
D. Insulation and Windings
To obtain a long life and satisfactory operation of
insulated windings, they should be kept clean from dirt,
oil, metal particles and other contaminants. A variety
of satisfactory and acceptable methods are available
for keeping the windings clean. The choice of method
will depend greatly on time, availability of equipment
and on the insulation system. Vacuum and/or
compressed air cleaning with non-metallic hose tips
should precede cleaning with water and detergent or
with solvents. Tightly adhering dirt will require removal
by gentle brushing or wiping.
WARNING:
To prevent injury to the eyes
and respiratory organs, safety glasses
and suitable ventilation or other
protective equipment should be used.
E. Vacuum and Compressed
Air Cleaning
Compressed air should be used to remove loose dirt
and dust from air passages such as air ducts. Suction
should be used to remove dirt from the windings and
to avoid damaging the coils.
CAUTION:
Care must be taken to make
sure the air is dry and that air pressure of
not more than 21 x 10
3
kg/m
2
(30 psi)
is used.
WARNING:
Operator must not use
compressed air to remove dirt or dust
from his person or clothing
.
