Connecting-Up Information; Internal Potential Bonding; Motor And Connecting Cables - Siemens SINAMICS S 1PH7 Configuration Manual

Connection system

6.4 Connecting-up information

6.4 Connecting-up information
6.4
Note
The system compatibility is only guaranteed if shielded power cables are used, the shield is
connected to the metal motor terminal box through the largest possible surface area (using
metal EMC cable glands).
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!)
Use EMC cable glands for fixed cable entries. The cable glands are screwed into the
threaded holes of the cable entry plate that can be removed.
Openings that are not used must be closed using an appropriate metal cap.
Before carrying-out any work on the motor and the fan, please ensure that it is powered-
down and the system is locked-out so that the motor cannot re-start!
Please observe the rating plate data (type plate) and circuit diagram in the terminal box.
Adequately dimension the connecting cables.

Internal potential bonding

The potential bonding between the ground terminal in the terminal box and the motor frame
is established through the retaining bolts of the terminal box. The contact locations
underneath the screw/bolt heads are bare and are protected against corrosion.
The standard screws that are used to connect the terminal box cover to the terminal box are
sufficient as potential bonding between the terminal box cover and the terminal box
enclosure.

Motor and connecting cables

● Twisted or three-core cables with additional ground conductor should be used as motor
● The connecting cables should be freely arranged in the terminal box so that the protective
● Take special care that the required air clearances are actually maintained:
216
WARNING
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.
conductor has an overlength and the cable conductor insulation cannot be damaged.
Connecting cables should be appropriately strain relieved.
– Up to SH 160, a minimum of 4.5 mm
– From SH 180 and above, at least 10 mm
1PH7 induction motors (Machine tools)
Configuration Manual, (APH7W), 04/2009, 6SN1197-0AD72-0BP0