Installation instructions

GEI-M1011A
In addition to a daily observation of the overall condition,
it is recommended that a regular inspection routine be set
up to check periodically the following items:
1. General Cleanliness
2. Insulation and Windings
3. Lubrication and Bearings
4. Coupling Bolt Tightness
B. General Cleanliness
While TEFC motors are enclosed for protection against
adverse conditions of service, they should be kept
reasonably clean for longer trouble-free life. External air
passages in the top end shield and stator frame should be
cleaned periodically to prevent overheating of the motor.
Oily vapor, debris, or dust may build up and block off
ventilation. Any of these contaminants can lead to early
motor failure. Motors should be disassembled and
thoroughly cleaned periodically as needed.
Motors may be blown out with dry, compressed air of
moderate pressure. However, cleaning by suction is
preferred because of the possibility of water in the
compressed air lines and the danger of blowing metal chips
into the insulation with compressed air.
WARNING: To prevent injury to eyes
and respiratory organs, safety
glasses and suitable ventilation or
other protective equipment should be
used. Operator must not use compressed air to
remove dirt or dust from his person or clothing.
Covers are provided as necessary for protection of the
equipment personnel. If screens are furnished (non-
standard) they must be kept free of dirt and debris to
ensure proper ventilation.
C. Coupling Maintenance
The condition of non-reverse couplings should be checked
periodically by removing the tip cap. If dirt has caused the
action of the pins to become sluggish, the pin carrier
should be removed, disassembled, and thoroughly cleaned
with a suitable solvent. The parts should then be dried and
reassembled in accordance with the instructions given
under Non-Reverse Couplings.
Sometimes, after a long period of operation with frequent
stops and starts, the surface of the holes in the pin carrier
becomes polished, so that friction forces will no longer
hold the pins clear of the ratchet teeth when the motor is
running. This condition can be remedied by roughening
these surfaces with a piece of emery paper wrapped around
a rod.
NOTE:
Whenever the dismantling of
couplings is necessary, the use of witness
marks will assure a balanced condition
when reassembly is compl
ete.
Bolts on both bolted couplings and non-reverse couplings
should be checked periodically to be sure they are tight.
See Required Bolt Torques.
D. Relubrication
1. Oil Lubricated Bearings
Motors 320 frame sizes and larger have an oil lubricated
upper bearing. The following instructions apply to that
bearing. Grease lubricated instructions for all other
bearings are included in the following section.
Maintain proper lubrication by checking the oil level
periodically and adding oil when necessary. Because of the
clearing action of the bearing as the motor accelerates up to
speed and the expansion of the oil as it comes up to
operating temperature, the oil level will be higher after the
motor has been in operation for a while than it is with the
motor at standstill. The normal level, with the motor
stopped and the oil cold, is marked STANDSTILL LEVEL
on the sight gage.
Overfilling should be avoided not only because of the
possibility that expansion may force the oil over the oil
sleeve and into the motor, but also because operating with
the oil level too high prevents the bearing from clearing
itself of excess oil. The resultant churning can cause extra
loss, high temperatures, and oxidized oil.
If, during operation, the oil level goes above the maximum
shown on the sight gage, drain enough oil to bring the level
back within the operating range. A hole is provided inside
the drain plug to make it possible to do this without
completely removing the plug.
Do not permit the operating oil level to fall below the
minimum shown on the gage. Should it ever become
necessary to add excessive amounts of make-up oil.
investigate immediately for oil leaks.
Change oil at regular intervals. The time between oil
changes depends upon the severity of operating conditions
and, hence, must be determined by the motor user. One or
two changes a year is average, but special conditions, such
as high ambient temperature, may require more frequent
changes. Avoid operating motor with oxidized oil.
Use only best grade, oxidation and corrosion inhibited
turbine oil produced by reputable oil companies. The
viscosity (weight) of the oil to be used depends upon the
type and size of the bearing, its load and speed, the
ambient temperature, and the amount and temperature of
the cooling water (if used). The lubrication nameplate or
instruction with each motor specifies the viscosity range of
oil suitable for average conditions. The usual
recommendations are summarized in Table 2, Oil
Viscosity. Operation in ambient temperatures that are near
or below freezing may require preheating the oil or the use
of a special oil.
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