installation &
operating instructions
ac induction motors
6
frequency or relubrication
The following table suggests re-lubrication intervals for motor
on normal steady running, light duty indoor load in relatively
clean atmosphere at 40°c (104°f) ambient temperature or less.
enclosure insulation frames 143-215 frames 254+
tefc f not greasable 6 months
Frame sizes 143 through 215, inclusive have permanently
lubricated sealed bearings.
note
Frequency shown above should be reduced by:
½ - For motors above 1800 rpm
½ - For heavy-duty, dusty locations.
L - For severe-duty, high vibration and shock
type of grease
Use Polyrex em Polyurea grease or equivalent unless special
grease is specified on the nameplate.
procedure for relubrication
When re-greasing, stop the motor, remove outlet plug and add
amount of grease per reference table below, with hand level
gun only. Discontinue at once if grease appears at outlet plug.
This may occur before specified amount is used.
Run for about ten minutes before replacing outlet plug.
Volume reference table
shaft diameter
(at face of bearing)
grease amount
(ounce)
0.8in to 1.2in 1.5g to 2.8g (0.05 to 0.1)
1.4in to 1.8in 3.1g to 5.7g (0.11 to 0.2)
2.0in to 2.2in 12.3g to 17g (0.43 to 0.6)
2.4in to 3.3in 32.8g to 45g (1.16 to 1.6)
caution
Over-greasing is a major cause of bearing and motor
failure. Make sure that dirt and contaminants are not
introduced when adding grease.
inverter duty application
Please refer your application to Armstrong or its nearest
distributor for instruction.
storage
If the motor is not packaged for long-term storage and is not
to be put into service immediately, certain precautions should
be taken to protect it. If at all possible, place the motor under
cover in a clean and dry location.
During storage, the winding should be protected from exces-
sive moisture absorption by some safe and reliable method
of heating. Space heaters, if supplied, may be used for this
purpose. The temperature of the winding should be always
maintained a few degrees above the temperature of the
surrounding air.
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