Siemens 1MB115 Installation And Maintenance Manual

1317.1.8.2 Explosion hazard due to increased surface temperature! WARNINGExplosion hazard due to increased surface temperatureComponents within the motor may be hotter than the maximum permissiblesurface temperature for the enclosure. In an explosive atmosphere, dustcan ignite and an explosion occur. This can result in death, serious injury ormaterial damage.• Do not open the motor in an explosive and dusty atmosphere when it isstill at normal operating temperature.• Allow the machine to cool down before opening it.7.1.8.3 Regreasing intervals and types of grease for operating rolling-contactbearingsRegreasing intervalsThe regreasing intervals for rolling bearings in operating hours and the greasetypes are stated on the machine's lubricant plate. Regardless of the actualnumber of operating hours reached, regrease the motor at least once a year.The lubrication information can be found on the lubricant plate.NoteObserve the regreasing intervals for the rolling bearingsThe regreasing intervals for rolling bearings are different from the service/inspection intervals for the machine. Failure to regrease the rolling bearingsat the specified intervals can result in bearing damage.RegreasingThe spent grease chamber is designed to accommodate the spent grease for acomputed, rated service life of 20000 operating hours.• Clean the grease nipples before regreasing and then gradually press in anappropriate type and amount of grease, as described on the lubricant plate.The shaft must rotate so that the new grease can be distributed in therolling bearing. The rolling bearing temperature rises sharply at first, thendrops to the normal value again after the excess grease has been displacedout of the bearing.