Bearings; Balancing - Siemens SIMOTICS XP 1MB1 series Operating Instructions Manual

3.3.3

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.
3.3.4

Balancing

As standard, the motor is balanced dynamically with a half feather key (code "H").
Vibration level "A" is standard and, if ordered as an option, vibration level B is specified on
the rating plate.
See also
Balancing (Page 56)
1LA5/6/7/9, 1LG4/6, 1MA6/7, 1MB..1/2/3/4/5 - SH 63 ... 355
Operating Instructions, 06/2018, A5E44455710A
Description
3.3 Installation
25