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3.3.1.3
Motors without a fan (optional)
Surface cooling by free convection: Cooling method IC 410 according to EN / IEC 60034-6
Surface cooling by relative movement of cooling air: Cooling method IC 418 according to
EN / IEC 60034-6
3.3.2
Bearings
In order to support the motor shaft and maintain its position in the non-moving part of the
motor, only two rolling bearings are used. One rolling bearing performs the function of a
location bearing that transfers axial and radial forces from the rotating motor shaft to the
non-moving part of the motor. The second rolling bearing is implemented as a floating and
support bearing in order to allow thermal expansion inside the motor and transfer radial
forces.
The nominal (calculated) useful life of the bearings according to ISO 281 is at least 50,000
hours if the motor is coupled via a direct flexible coupling. 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 motor is equipped with grease-lubricated rolling bearings.
• In the standard version, the bearings of motors up to shaft height 200 are permanently
lubricated.
• The bearings of motors from shaft height 225 and above are equipped with a button head
grease nipple.
3.3.3
Balancing
As standard, the motor 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.
1LE7 shaft heights 71 ... 315
Operating Instructions, 04/2022, A5E51689275A-AA
Description
3.3 Installation
21
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