12.Push the intermediate housing with the cutout over the hoses. Screw the intermediate
housing onto the motor. Protect the hoses from mechanical stresses.
13.Screw the fan onto the intermediate housing.
14.Seal the remaining openings between the cutout and the hoses.
4.6.2 Bearingless, frame-supported rotating union
The bearingless frame-supported rotating union cannot be mounted directly on the motor. An
adapter is required for the static part of the rotating union. The adapter is not included in the
scope of delivery and must be made by the customer to match the rotating union to be used.
Carefully comply with the design notes:
• Match the adapter to hold the static part to the rotating union to be used. To do this, carefully
comply with the dimensions of the manufacturer of the rotating union. Implement the
adapter as shown in Chapter "Suggestion for an adapter for bearingless, frame-supported
rotating unions".
• The gap between the adapter and the NDE shaft extension must be as small as possible in the
radial direction (approx. 0.25mm) and be as long as possible in the axial direction so that
coolant that escapes cannot enter the motor.The leakage connections must be as large as
possible and must be provided at the lowest point in the leakage chamber. The leakage
connection (G3/8") located nearest the static part of the rotating union is for draining leakage
away during operation. The second leakage connection (G1/4") is a backup for draining away
increased leakage due to faults.
NOTICE
Monitoring the backup line
Monitor the ow rate of the backup line to detect any faults in the rotating union in good time,
and to protect the motor from ooding.
• Make sure that a signal is output in the event of leakage.
• Make sure that the system (coolant supply) is switched o in case of a fault.
• Implement the star-shaped drainage openings in the mounting surface to the encoder cover
as shown in Chapter "Suggestion for an adapter for bearingless, frame-supported rotating
unions" so that liquid cannot penetrate the motor through the labyrinth seal between the
encoder cover and the balancing disk. If the motor is mounted vertically, all 6 drainage holes
should be opened; if the motor is mounted horizontally, it is enough to open the two lower
drainage holes.
Note
Provide a sealing air connection to protect the motor against the penetration of coolant.
Mechanical properties
4.6Mounting of rotating unions on 1PH8 hollow-shaft motors
1PH8 SIMOTICS M main motors
Conguration Manual, 12/2022, A5E51895839A 103
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