Equipotential Bonding - Siemens SINAMICS G115D Operating Instructions Manual

Wiring
4.1 EMC installation guidelines
• Route all power cables (line supply and motor cables) separately from signal and data
cables. The minimum distance should be approximately 25 cm.
Exception: hybrid motor cables with integrated shielded temperature sensor and brake
control wires are allowed.
• For the wall-mounted converters, shield the motor cable between converter and motor.
We recommend shielded cables with symmetrical three-phase conductors (L1, L2, and L3)
and an integrated, 3-wire, and symmetrically arranged PE conductor.
Cable shields
• Use shielded cables with finely stranded braided shields. Foil shields are not suitable since
they are much less effective.
• Connect shields to the grounded housings at both ends with excellent electrical
conductivity and a large contact area.
• Bond the cable shields to the plug connectors of the converter.
• Do not interrupt cable shields by intermediate terminals.
• For power cables as well as signal and data cables, the cable shields should be connected
by means of suitable EMC glands. The cable shields must be connected to the shield
bonding options for cables and the unit housing respectively with excellent electrical
conductivity and a large contact area.
• Use only metallic or metallized connector housings for shielded data cables.
4.1.3

Equipotential bonding

Equipotential bonding within the drive system has to be established by connecting all
electrical and mechanical drive components (transformer, motor and driven machine) to the
grounding system. These connections are established by means of standard heavy-power PE
cables, which do not need to have any special high-frequency properties.
In addition to these connections, the converter (as the source of the high-frequency
interference) and all other components in each drive system (motor and driven machine)
must be interconnected with respect to a high-frequency point of view. For this purpose
cables with good high-frequency properties must be used.
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Operating Instructions, 09/2020, FW V4.7 SP13, A5E48681219B
SINAMICS G115D distributed drive