Siemens SIMOTICS DP series, Руководство по эксплуатации

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Description
3.3 Installation
Standard motors SH 63 ... 355
Operating Instructions, 12/2018, A5E38483075A
23
3.3.1.3 Machines without a fan (optional)
Surface cooling by free convection: Cooling method IC 410 according to EN / IEC 60034-6
Figure 3-1 IC410
Surface cooling by relative movement of cooling air: Cooling method IC 418 according to
EN / IEC 60034-6
Figure 3-2 IC418
3.3.2 Bearings
In order to support the machine shaft and maintain its position in the non-moving part of the
machine, only 2 rolling bearings are used. One rolling bearing performs the function of a
location bearing that transfers axial and radial forces from the rotating machine shaft to the
non-moving part of the machine. The second rolling bearing is implemented as floating and
support bearing in order to allow thermal expansion inside the machine and transfer radial
forces.
The nominal (calculated) useful life of the bearings according to ISO 281 is at least 20,000
hours with utilization of the permissible radial/axial forces. 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.