Bearings; Axial And Radial Forces - Siemens SIMOTICS XP Operating Instructions Manual

Forced ventilation (optional): Type of cooling IC 416 in accordance with EN / IEC 60034-6
Cooling that does not depend on the speed is achieved by means of a unit that is
independent of the motor operating state (forced ventilation). This unit is closed to the
outside by a fan cover. It has its own main drive with fan impeller which creates the cooling
air flow required for cooling the motor.
3.3.3

Bearings

To support the machine shaft and maintain its position in the non-moving part of the
machine, DE and NDE rolling bearings are used. One end performs the function of a locating
bearing that transfers axial and radial forces from the rotating machine shaft to the non-
moving part of the machine. The opposite end is implemented as a floating and support
bearing to allow thermal expansion inside the machine and transfer radial forces.
The nominal (theoretical) service life of the bearings according to ISO 281 is at least 20,000
hours when the permissible radial/axial forces are complied with, and the machine is
operated on 50 Hz line supplies. However, the achievable useful life of the bearings can be
significantly longer in the case of lower forces (e.g. operation with self-aligning couplings).
Rolling bearings with permanent lubrication are maintenance-free.
The machine is equipped with grease-lubricated rolling bearings.
• In the standard version, the bearings of machines up to shaft height 250 are permanently
lubricated.
• The bearings of machines from shaft height 280 and above are equipped with a
relubrication system.
3.3.4

Axial and radial forces

Permissible values for axial and radial forces are listed in the catalog or stamped on the rating
plate depending on the type of construction / mounting type. The data stamped on the rating
plate have priority.
1MB..5/6 shaft height 71 ... 355
Operating Instructions, 10/2021, A5E41926185A
Description
3.3 Design
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