Converter Operation; Connecting To A Converter; Insulated Bearings For Converter Operation - Siemens 1PH818 Operating Instructions & Installation Instructions

Preparations for use

4.14 Converter operation

4.14 Converter operation
4.14.1

Connecting to a converter

Selecting and connecting the cable
● Use Motion Connect cables or symmetrically constructed, shielded cables to connect the
● The shield is connected at both ends, at the motor and converter. Keep unshielded cable
● In order to ensure that high-frequency currents are efficiently discharged, provide a 360°
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.
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motor to a converter. The cable shielding, made up of as many strands as possible, must
have good electrical conductivity. Braided shields made of copper or aluminum are well
suited.
ends as short as possible.
contact through a large surface area at the converter and at the motor. Use for instance,
EMC glands at the cable entries.
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
SIMOTICS M-1PH8 1PH818., 1PH822.
Operating Instructions 07/2016