Connection To A Converter; Converter Operation On A Grounded Network - Siemens 1PH818 Operating Instructions Manual

6.2.11

Connection to a converter

Selecting and connecting the cable
● Use Motion Connect cables or symmetrically constructed, shielded cables to connect the
● The shield must be connected at both ends to the motor and the converter; unshielded
● To ensure effective discharge of high-frequency currents, make the shield contact over
Measures to reduce bearing currents
To specifically reduce and prevent damage caused by bearing currents, you must 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.
● Use iron cores mounted above the motor connecting cable at the converter output. These
● Limit the voltage rate of rise by using an output filter to dampen harmonic components in
6.2.12

Converter operation on a grounded network

Parallel PE conductor
In the case of current-limited converters without ground fault monitoring, PE conductor
currents of up to 1.7 times the external conductor current can arise if there is a ground fault
on the output side. Neither the PE conductors of normally rated multi-core connecting cables
nor the PE connecting points of normal terminal boxes are suitable for this purpose.
● Use an appropriately sized parallel PE conductor.
● Connect the parallel PE conductor to the grounding terminal on the motor enclosure.
A5E02605207A AA
Siemens AG Operating Instructions V1.0 1PH8
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.
cable ends must be kept as short as possible.
the largest possible area, i.e. as a 360° contact on the converter and motor, e.g. using
EMC glands at the cable entry points.
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 driven machine, motor
and converter and inside the motor
help to reduce common-mode components. The Siemens sales representative is
responsible for selection and dimensioning.
the output voltage
Connection
6.2 Electrical connection
43