Bearings; Balancing; Types Of Construction/Method Of Installation - Siemens SIMOTICS SD 1LE5 Operating Instructions Manual

Description
3.3 Installation
Surface cooling by relative movement of cooling air: Cooling method IC 418 according to
EN / IEC 60034-6
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.
22
IC418
1LE5, 1PC4 shaft height 315/355
Operating Instructions, 10/2020, A5E41454666A