Siemens SIMOTICS M 1PH8 Configuration Manual page 106

Mechanical properties
4.6 Mounting of rotating unions on 1PH8 hollow-shaft motors
• The diameters and end faces of the adapter for supporting the encoder cover or the static
part of the rotating union should be turned in one clamping if possible. For simpler
machining, the adapter can be axially split. It is important that the finish-machining of the
support diameter and end faces is performed in the assembled condition and in one
clamping.
Mounting on water-cooled motors
Water-cooled motors have a "2" in the 11th position of Article No. together with option Y64.
Use rotating unions with radial or axial connections.
Mounting a bearingless rotating union on a water-cooled motor
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9
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Encoder cover
Balancing disk
Adapter
6 x M5 bolts
Rotating part of the rotating union, e.g. DEUBLIN 1129-050-301
Static part of the rotating union, e.g. DEUBLIN 1129-050-301
Leakage hose (min. internal diam. 12 mm)
Leakage hose as backup and for faults
Inlet hose
Sealing air connection
1PH8 SIMOTICS M main motors
Configuration Manual, 12/2022, A5E51895839A