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Equipotential bonding conductors:
Use equipotential bonding conductors:
• between motor and driven machine
• between motor and converter
• between the terminal box and the RF grounding point at the motor enclosure.
Selecting and connecting the cable:
As far as possible, use symmetrically arranged, shielded connection cables. The cable shielding,
made up of as many strands as possible, must have good electrical conductivity. Braided shields
made of copper or aluminum are very suitable.
• The shield is connected at both ends, at the motor and converter.
• To ensure good discharging of high-frequency currents, provide contacting over a large
surface area:
– as contact established through 360° at the converter
– at the motor, for instance with EMC glands at the cable entries.
• If the cable shield is connected as described, then it ensures the specified equipotential
bonding between the motor enclosure and converter. A separate RF equipotential bonding
conductor is then not necessary.
• If the cable shield is not connected due to special secondary conditions, or not adequately
connected, then the specified equipotential bonding is not provided. In this particular case,
use a separate RF equipotential bonding conductor:
– Between the motor enclosure and protective ground rail of the converter.
– Between motor enclosure and driven machine
– Use braided flat copper straps or high-frequency cables with finely-stranded conductors
– Ensure that the contacts are made over a large area.
Measures to reduce bearing currents
To specifically reduce bearing currents, you must consider the system as a whole, which
comprises the motor, converter, and driven machine. The following measures support you when
reducing bearing currents and help to avoid damage:
• In the overall system, set up a properly meshed grounding system with low impedance.
• Use the common-mode filter (damping cores) at the converter output. The Siemens sales
representative is responsible for selection and dimensioning.
1FU9
Operating Instructions, 07/2020, A5E46712792A
Concentric copper or aluminum shield
for the separate RF equipotential bonding cable.
Preparing for use
4.11 Converter operation
Steel armor
37
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