Flameproof motors | 43
Table 8-13 - Ball bearings lubrication intervals vertical
mounting rib cooled motors
Lubrication intervals for vertical mounted tube
cooled cooled motors (50Hz and 60Hz) operating
at an ambient temperature range -20ºC up to
+55ºC are present in the Table 8-14 and Table
8-15:
Table 8-14 - Angular bearings lubrication intervals
vertical mounting tube cooled motors
ANGULAR CONTACT BALL BEARING
Table 8-15 - Ball bearings lubrication intervals vertical
mounting tube cooled motors
For motors working in ambient temperatures
between -20ºC and +60ºC, a derating factor of 0.8
must be applied to the values indicated in the Table
8-9 to Table 8-15.
8.2.5. QUALITY AND QUANTITY OF GREASE
The relubrication can only be made with compatible
grease and in the amount indicated on the motor
nameplate as lacking of grease or excessive
grease affects the bearings.
Excessive grease causes overheating due to high
resistance caused by rotating parts resulting in
damage to grease properties.
Additionally, excess of grease may cause leakage
with the grease penetrating into the motor winding.
Use only the type and quantity of
grease indicated on the motor
nameplate.
8.2.6. COMPATIBILITY
The incompatibility of different types of grease can
create occasional problems. When the properties
of the mixture remain within the individual property
range of the greases, we can say the greases are
compatible.
To avoid any possible incompatibility grease
problem, we recommend performing an
appropriate lubrication which can be summarized
as follows: after removing the old grease and
carring out a complete cleanliness of the grease
cavity, new grease must be pumped in. When this
procedure is not allowed, pump in new grease by
pressure. This must be repeated until new grease
is drained out through the grease relief.
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