Axial And Radial Forces - Siemens SIMOTICS XP 1MB155 Operating Instructions Manual

Shaft extensions with feather key
To maintain the balancing quality, you have the following options:
● If the transmission element is shorter than the feather key with balancing type "H", then
you must machine off the section of feather key protruding from the shaft contour and
transmission element in order to maintain the balance quality.
● If the transmission element is drawn up on to the shoulder of the shaft, you must ensure
that the part of the coupling groove where the feather key is not inserted is taken into
consideration when balancing the coupling.
The following applies to all four-pole machines with a frequency ≥ 60 Hz:
● The feather key must be shortened if the coupling hub us shorter than the feather key.
● The center of gravity of the coupling half should be within the length of the shaft end.
● The coupling used must be prepared for system balancing.
The number of poles of the machine is specified on the rating plate, at the 10th position of
the motor type. There, four-pole machines are marked with a "B".
The feather key can fall out
The feather keys are only locked against falling out during shipping. If a machine with two
shaft extensions does not have an output element on one shaft extension, the feather key
can fall out during operation.
Death or serious injury can result.
• Do not operate the machine unless the transmission elements have been pulled on.
• On shaft extensions without output element, make sure that the feather key cannot fall
5.4.6

Axial and radial forces

You can obtain the permissible values for axial and radial forces by contacting the Service
Center or referring to the machine catalog.
Damage to bearings or the shaft
Large output masses and their centers of gravity outside the shaft extensions can lead to
resonance in operation. This can result in damage to the bearings and shaft. In an
explosive atmosphere, there is a risk of explosion. Death, serious injury, or material
damage can result.
• Ensure that the permissible loads for the forces on the shaft extension are adhered to in
1MB155 / 1MB555
Operating Instructions, 03/2018, A5E41926185A
WARNING
out and shorten it by approximately half for balance type "H".
WARNING
accordance with the catalog data or configuration data.
Assembly
5.4 Installing the machine
63