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Insulated Bearings When Operating The Converter - Siemens 1LA8 Operating Instructions Manual

Simotics tn series n-compact induction motor.
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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

Insulated bearings when operating the converter

If the machine is operated from a low-voltage converter, insulated bearings are fitted at the
NDE and an insulated encoder with insulated bearings (option).
Comply with the plates on the machine relating to bearing insulation and possible bridges.
Figure 4-2
SIMOTICS TN Series N-compact 1LA8
Operating Instructions 05/2014
high-frequency currents.
representative is responsible for selection and dimensioning.
output voltage.
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
Schematic representation of a single drive
4.12 Converter operation
Insulated bearings
Insulated tachometer fitting
Preparations for use


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