This advantage does not apply to rotor-supported rotating unions. It is important to ensure
that the preloading force of the motor bearing is not eliminated (see gure "Mounting the
rotating union" case 2). The axial force toward the motor must not be in the interval F
AZ
=
F
c
+/- 25% for horizontally mounted motors and F
AZ
= (F
c
+/-25%) + FL for vertically mounted
motors with the shaft extension pointing downward. For maximum permissible axial forces
at the shaft extension, the specications stated in Chapter "Radial and axial forces" apply. The
axial forces that act in the rotating union must be requested from the manufacturer.
Hollow shaft version
Table 4-21 Hollow shaft version
1PH808☐ 1PH810☐ ... 1PH816☐
Thread on DE M12 x 1.25-RH M16 x 1.5-RH
Centering on DE ∅16H7 ∅20H7
Thread on NDE M12 x 1.25-LH M16 x 1.5-LH
Centering on NDE ∅14+0.008/+0.001 ∅18+0.007/-0.003
Through-hole ∅8 ∅11.5
Key surface NDE SW19 SW27
4.6.1 Rotor-supported rotating union
NOTICE
Leaks in the rotating union
If there are leaks in the rotating union and the hoses, the motor may be ooded and fail!
• Avoid leaks in the rotating union.
Note the following points when mounting the rotating union:
• When you mount the rotating union, pay attention to special aspects that dier between air-
cooled and water-cooled motors.
• When installing the rotating union, observe the manufacturer’s data.
Mounting on water-cooled motors
Water-cooled motors have a “2” in the 11th position in the Article No. With water-cooled motors,
you can mount the rotating union directly on the motor. Use rotating unions with radial or axial
connections.
Mechanical properties
4.6Mounting of rotating unions on 1PH8 hollow-shaft motors
1PH8 SIMOTICS M main motors
Conguration Manual, 12/2022, A5E51895839A 99
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