Siemens 1MB115 Installation And Maintenance Manual page 131

7.1.8.2 Explosion hazard due to increased surface temperature
!
Explosion hazard due to increased surface temperature
Components within the motor may be hotter than the maximum permissible
surface temperature for the enclosure. In an explosive atmosphere, dust
can ignite and an explosion occur. This can result in death, serious injury or
material damage.
• Do not open the motor in an explosive and dusty atmosphere when it is
• Allow the machine to cool down before opening it.
7.1.8.3 Regreasing intervals and types of grease for operating rolling-contact
bearings
Regreasing intervals
The regreasing intervals for rolling bearings in operating hours and the grease
types are stated on the machine's lubricant plate. Regardless of the actual
number of operating hours reached, regrease the motor at least once a year.
The lubrication information can be found on the lubricant plate.
Note
Observe the regreasing intervals for the rolling bearings
The regreasing intervals for rolling bearings are different from the service/
inspection intervals for the machine. Failure to regrease the rolling bearings
at the specified intervals can result in bearing damage.
Regreasing
The spent grease chamber is designed to accommodate the spent grease for a
computed, rated service life of 20000 operating hours.
• Clean the grease nipples before regreasing and then gradually press in an
appropriate type and amount of grease, as described on the lubricant plate.
The shaft must rotate so that the new grease can be distributed in the
rolling bearing. The rolling bearing temperature rises sharply at first, then
drops to the normal value again after the excess grease has been displaced
out of the bearing.
WARNING
still at normal operating temperature.
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