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Measures to further reduce bearing currents
To specifically reduce and prevent damage caused by bearing currents, you must consider
the system as a whole, which comprises the motor, converter, and driven machine. The
following precautions help to reduce bearing currents:
● In the overall system, set up a properly meshed grounding system with low impedance for
● Use the common-mode filter (damping cores) at the converter output. The Siemens sales
● Limit the rise in voltage by using output filters. This dampens the harmonic content in the
4.11.2
Insulated bearings when operating the converter
Depending on the machine's size and design, an insulated bearing and an insulated
tachometer can be fitted at the non-drive end.
Comply with the plates on the machine relating to bearing insulation and possible bridges.
①
②
③
Figure 4-1
LOHER CHEMSTAR 1PS5
Operating Instructions 03/2014
Concentric copper or aluminum shield
high-frequency currents.
representative is responsible for selection and dimensioning.
output voltage.
Note
Converter documentation
The operating instructions for the converter are not part of this documentation. Refer also
to the configuration information for the converter.
Driving machine
Motor
Coupling
Schematic representation of a single drive
4.11 Converter operation
④
Insulated bearings
⑤
Insulated tachometer fitting
Preparations for use
Steel armor
39
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