4.1.3
Maximum permissible motor cable length
Always dimension the motor cable so that the ohmic losses are less than 5% of the converter
power rating.
The permissible length of the motor cable also depends on the quality of the motor cable and
the converter pulse frequency. The values specified below are applicable for high quality
cables, such as CY100 or similar, and for the pulse frequencies set in the factory.
If you set other pulse frequencies, then you must ensure that the EMC category is complied with
on the plant or system side.
EMC-compliant wiring is required in order that the converter complies with the EMC category
listed in the following table.
EMC-compliant setup of the machine or plant (Page 39)
Carefully observe the following section for operation in the first environment:
Electromagnetic compatibility of the converter (Page 873)
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 permissible 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 have to achieve compliance with an EMC category, additional restrictions apply to the
motor cable length in order to control conducted interference.
Description
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 G120XA converter
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Operating Instructions, 03/2019, FW V1.0, A5E44751205B AB
Summary of Contents for SINAMICS G120XA
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