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Preparations for use
4.14 Converter operation
Measures to reduce bearing currents
To specifically reduce and prevent damage caused by bearing currents, consider the system
as a whole, which comprises the motor, converter, and driven machine. The following
precautions help to prevent bearing currents:
● Setting up a properly meshed grounding system in the system as a whole, with low
● No potential difference between the motor, converter, and working machine.
● Limit the voltage rate of rise by using an output filter to dampen harmonic components in
4.14.2
Insulated bearings for converter operation
If the machine is operated with a low-voltage converter such as SINAMICS G150 / S150 /
S120, then an insulated bearing and a speed encoder with insulated bearings (option) is
mounted at the non-drive end.
For 1PH818, the insulated bearings are optional; for 1PH822 and 1PH828, insulated bearings
are standard.
Comply with the plates on the machine relating to bearing insulation and possible bridges.
①
②
③
Figure 4-6
46
impedance for high-frequency currents
– Use symmetrical, shielded connecting cables.
– Connect the cable shield at both ends over the greatest possible surface area (360°
contact).
– Use equipotential bonding conductors between the motor and the driven machine as
well as between the motor and the converter
the output voltage
Driven machine
Motor
Coupling
Schematic representation of a single drive
④
Insulated bearings
⑤
Insulated tachometer fitting
SIMOTICS M-1PH8 1PH818., 1PH822., 1PH828.
Operating Instructions 10/2017
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