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.
SIMOTICS TN Series N-compact 1LA8
Operating Instructions 05/2014
representative is responsible for selection and dimensioning.
The operating instructions for the converter are not part of this documentation. Refer also
to the configuration information for the converter.
Schematic representation of a single drive
4.12 Converter operation
Insulated tachometer fitting
Preparations for use