Siemens SIMOTICS XP Operating Instructions Manual page 67

Only transfer radial or axial forces specified in the catalog to the machine bearings via the
shaft extension.
You can obtain the permissible values for axial and radial forces by contacting the Service
Center (Page 143) or by referring to the machine catalog.
See also
Axial and radial forces (Page 25)
Shaft extensions with feather key
The feather key data for the shaft and drive output element must match and indicate the
correct type of balancing. The drive output element must be correctly mounted.
The balance quality corresponds to vibration severity grade "A" for the complete machine;
vibration severity grade "B" is possible as an option. To ensure the required balance quality, it
must be ensured that the feather key data on the hub and machine shaft match in the case of
a shorter or longer drive output element.
• If the drive output 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
drive output element in order to maintain the balance quality.
• If the drive output element is longer than the feather key, when balancing the coupling,
take into account that the feather key does not take up all of the coupling slot.
The following applies to all four-pole machines with a frequency ≥ 60 Hz:
• The feather key must be shortened if the coupling hub is 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.
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Operating Instructions, 10/2021, A5E41926185A
Mounting drive output elements
Assembly
5.5 Installing the machine
65