• First screw the exible hoses onto the rotor-supported rotating union. Then screw the
rotating union onto the shaft with the specied torque.
• Avoid stressing due to incorrect hose lengths and unsuitable mounting material.
• The rotating union must be easy to turn when mounted.
• Keep rotating unions free of chips and burrs.
• Position the rotating union horizontally in such a way that the leakage connection is at the
lowest point.
• Always route the leakage hose downward at at least 15° with a large cross-section.
• If the leakage hose is higher than the leakage connection and the mechanical seal is open,
the rotating union and possibly also the motor will be ooded. The motor can fail.
• Also route the inlet hose downward. This causes the coolant to ow back in the supply line
when the mechanical seal is open (e.g. tool change or standstill) and not through the motor
shaft and the leakage connection.
• Filter the coolant so that no particles or chips can reach the mechanical seal and damage it.
Note
Mounting the rotating union
• During assembly, screw the thread absolutely tightly into the NDE shaft extension. Ensure
that no coolant can leak.
• Check the rotating union and hoses regularly for tightness.
Mechanical properties
4.6Mounting of rotating unions on 1PH8 hollow-shaft motors
1PH8 SIMOTICS M main motors
108 Conguration Manual, 12/2022, A5E51895839A
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