Siemens 1FT7 Series, Configuration Manual

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Connection system
6.1 Power connection
1FT7 Synchronous Motors
Configuration Manual, (PFT7S) 01/2009, 6SN1197-0AD13-0BP2
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Connecting-up information
WARNING
Before carrying out any work on the AC motor, please ensure that it is powered-down and
the system is locked-out so that the motor cannot re-start!
Please observe the data on the rating plate (type plate) and the circuit diagram in the
terminal box.
Note
The overall system compatibility is only guaranteed when using shielded power cables.
Shields must be incorporated in the protective grounding concept. Protective ground should
be connected to conductors that are open-circuit and that are not being used and also
electrical cables that can be touched. If the brake feeder cables in the SIEMENS cable
accessories are not used, then the brake conductor cores and shields must be connected to
the cabinet ground (open-circuit cables result in capacitive charges!).
● Twisted or three-core cables with additional ground conductor should be
used as motor feeder cables. The insulation should be removed from the ends of the
conductors so that the remaining insulation extends up to the cable lug or terminal.
● The connecting cables should be freely arranged in the terminal box so that the protective
conductor has an overlength and the cable conductor insulation cannot be damaged.
Connecting cables should be appropriately strain relieved.
● Please ensure that the following minimum air distances are maintained: Supply voltages
up to 500 V: Minimum air distance 4.5 mm
● After connecting up, the following should be checked:
–
The inside of the terminal box must be clean and free of any cable pieces
– All of the terminal screws must be tight
– The minimum air distances must be maintained
– The cable glands must be reliably sealed
– Unused cable glands must be closed and the plugs must be tightly screwed in place
– All of the sealing surfaces must be in a perfect condition