● If the cable shield is connected as described, then it ensures the specified equipotential
bonding between the motor enclosure and converter. A separate RF equipotential bonding
conductor is then not necessary.
/
3(
3(
3(
/
/
/
/
/
3(
/
/
/
Concentric copper or aluminum shield
Steel armor
● If the cable shield is not connected due to special secondary conditions, or not adequately
connected, then the specified equipotential bonding is not provided. In this particular case,
use a separate RF equipotential bonding conductor:
– Between the motor enclosure and protective ground rail of the converter.
– Between motor enclosure and driven machine
– Use braided flat copper straps or high-frequency cables with finely-stranded conductors
for the separate RF equipotential bonding cable.
– Ensure that the contacts are established over a large area.
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
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.
Note
Converter documentation
The operating instructions for the converter are not part of this documentation. Refer also to the
configuration information for the converter.
4.19.5
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.
Preparations for use
4.19 Converter operation
SIMOTICS FD 1MM1
Operating Instructions 02/2019
47
Summary of Contents for SIMOTICS FD 1MM1 Series
Page 2: ...05 02 2019 16 03 V11 01 ...
Page 30: ...Description SIMOTICS FD 1MM1 30 Operating Instructions 02 2019 ...
Page 142: ...Maintenance 9 2 Corrective Maintenance SIMOTICS FD 1MM1 142 Operating Instructions 02 2019 ...
Page 166: ...Disposal 11 5 Disposal of components SIMOTICS FD 1MM1 166 Operating Instructions 02 2019 ...
Page 168: ...Service and Support SIMOTICS FD 1MM1 168 Operating Instructions 02 2019 ...
Page 172: ...Quality documents SIMOTICS FD 1MM1 172 Operating Instructions 02 2019 ...
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