Connecting Inverters In Compliance With Emc Regulations; Length Of Motor Cable - Siemens Sinamics G120 Hardware Installation Manual

5.2.2

Connecting inverters in compliance with EMC regulations

EMC-compliant wiring for connecting the line
supply and motor with shield plate.
①
②
EMC-compliant wiring for connecting the line
supply and motor without shield plate with a
mounting panel with good conducting charac-
teristics
①
②
5.2.3

Length of motor cable

Always dimension the motor cable so that the ohmic losses are less than 5 % of the inverter
power rating.
The permissible length of the motor cable also depends on the quality of the motor cable and
the inverter 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 pulse frequencies other than the factory setting, 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 specified EMC category is attained.
Power Modules PM240
Hardware Installation Manual, 07/2016, A5E36985441C AA
Line supply cable - unshielded
• Strain relief using a cable clamp
Motor cable - shielded
• Shield connection using a toothed strip
• Strain relief using a cable clamp
Line supply cable - unshielded
• Strain relief using a cable clamp
Motor cable - shielded
• Shield connection using a cable clamp
• Strain relief using a cable clamp
Pulse frequencies (Page 70).
Electromagnetic compatibility of variable-speed drives (Page 73)
5.2 Connecting the line and motor cable at the inverter
Connecting-up
43