Equipotential Bonding - Siemens SINAMICS G120P Hardware Installation Manual

● Signal and data cables must be shielded to minimize coupled-in interference with respect
to capacitive, inductive, and radiative coupling.
● Particularly sensitive signal cables, such as setpoint and actual value cables must be
routed with optimum shield bonding at both ends and without any interruptions of the
shield.
Cable shields
● Shielded cables must have finely stranded braided shields. Foil shields are not suitable
since they are much less effective.
● Shields must be connected to the grounded housings at both ends with excellent
electrical conductivity and a large contact area. Only when this method is used coupled-in
interference with respect to capacitive, inductive, and radiative coupling can be
minimized.
● Bonding connections for the cable shields should be established, where ever possible,
directly behind the cable entry into the inverter. For signal and data cables the shield
bonding options provided in the cabinet units should be used.
● Cable shields should not be interrupted, wherever possible, by intermediate terminals.
● In the case of both, the power cables and the signal and data cables, the cable shields
should be connected by means of suitable EMC shield clips or via electrically conductive
PG glands. These must connect the shields to the shield bonding options for cables and
the unit housing respectively with excellent electrical conductivity and a large contact
area.
● As plug connectors for shielded data cables (e. g. PROFIBUS cables) only metallic or
metallized connector housings should be used.
4.9.4

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 inverter (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 the high-frequency point of view. For this purpose cables with good high-
frequency properties must be used.
PM230 Power Module IP55
Hardware Installation Manual, 11/2014, A5E35319202B AA
Connecting
4.9 EMC guidelines
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