Additional requirements placed on the protective conductor
①
:
● For permanent connection, the protective conductor must fulfill at least one of the following
conditions:
– The protective conductor is routed so that it is protected against damage along its
complete length.
Cables routed inside switch cabinets or enclosed machine housings are considered to
be adequately protected against mechanical damage.
– As a conductor of a multi-conductor cable, the protective conductor has a cross-section
≥ 2.5 mm² Cu.
– For an individual conductor, the protective conductor has a cross-section ≥ 10 mm² Cu.
– The protective conductor consists of 2 individual conductors with the same cross-section.
● When connecting a multi-core cable using an industrial plug connector according to EN
60309, the protective conductor must have a cross-section of ≥ 2.5 mm² Cu.
● Observe the local regulations for protective conductors subject to a high leakage current at
the installation site.
4.1.3
Maximum permissible motor cable length
Overview
The longer the motor cable of the converter, the higher the line capacitances of the motor cable.
Line capacitances cause an additive current in converter operation and present an additional
load to the converter.
Therefore, a maximum admissible motor cable length is specified for each converter.
Options between converter and motor, e.g. output reactors, partially compensate for the line
capacitances. Certain options make the use of longer motor cables possible.
If you must achieve compliance with an EMC category, additional restrictions apply to the motor
cable length in order to control conducted emissions.
400 V converter
EMC category according to EN 61800‑3
Shielded motor cables and EMC-compliant installation are required in order to satisfy an EMC
category.
Wiring
4.1 Line supply and motor
SINAMICS G120X converter
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Operating Instructions, 06/2019, FW V1.01, A5E44751209B AC
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