Bearings; Balancing; Types Of Construction/Method Of Installation - Siemens SIMOTICS SD Operating Instructions Manual
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- Operating instructions manual (136 pages) ,
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Surface cooling by relative movement of cooling air: Cooling method IC 418 according to
EN / IEC 60034-6
IC418 IC4A1A8
Figure 3-2
3.3.4
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.
3.3.5
Balancing
As standard, the machine is designed with vibration severity level A. The rotor is dynamically
balanced with a half feather key (code "H").
Vibration severity level B can be ordered as option, and stamped on the rating plate.
3.3.6
Types of construction/method of installation
The type of construction of the machine is stated on the rating plate.
1LE5, 1PC4 shaft heights 280 ... 355
Operating Instructions, 11/2022, A5E41454666A
IC418
Description
3.3 Installation
29
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