Insulated Bearings When Operating The Converter; Image 4-2 Schematic Representation Of A Single Drive - Siemens SIMOTICS FD 1LL1 Operating Instructions Manual

Overall system design
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
● Limit the rise in voltage by using output filters. Output filters dampen the harmonic content
Note
Converter documentation
The operating instructions for the converter are not part of this documentation. Refer also to
the configuration information for the converter.
4.17.3

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.
①
②
③
Image 4-2
SIMOTICS FD 1LL1
Operating Instructions 04/2016
representative is responsible for selection and dimensioning.
in the output voltage.
Driving machine
Motor
Coupling
Schematic representation of a single drive
4.17 Converter operation
④
Insulated bearings
⑤
Insulated tachometer fitting
Preparations for use
43