Installation
3.8 Equipotential bonding
SINAMICS G120D converter
28 Getting Started, 07/2016, FW V4.7 SP6, A5E38556189B AA
Equipotential bonding
Grounding and high-frequency equipotential bonding measures
All electrical and mechanical drive components (transformer, motor and driven machine)
must be connected 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 the motor must be interconnected with respect to the high-frequency point
of view:
● Use a shielded motor cable.
● Connect the cable shield both to the motor connector on the inverter and to the motor
terminal box.
● Use a short grounding connection from the PE terminal on the inverter to the metal frame.
The following figure illustrates all grounding and high-frequency equipotential bonding
measures using an example.
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