Preparations for use
4.14 Converter operation
1MB..5/6 shaft height 71 ... 355
48 Operating Instructions, 07/2020, A5E41926185A
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.
• Limit the rise in voltage by using output filters. Output filters dampen the harmonic
content in the output voltage.
• The operating instructions for the converter are not part of this documentation. Refer to
the configuration information for the converter.
4.14.4 Insulated bearings for converter operation
If the machine is controlled from a low-voltage converter, depending on the machine type,
an insulated bearing can be fitted at the NDE.
An insulated speed encoder can be optionally mounted.
Comply with the information provided on the machine plates relating to bearing insulation
and possible jumpers.
Insulated tachometer fitting
Figure 4-2 Schematic representation of a single drive
The bearing insulation must not be bridged. Bearing currents can damage bearings.
• Do not bridge the bearing insulation for subsequent installation work, such as the
installation of an automatic lubrication system or a non-insulated vibration sensor.
Where necessary, contact the Service Center.
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