Siemens SINAMICS G120XA - Routing Cables Outside the Control Cabinet; Requirements Relating to Shielded Cables; Electromechanical Components; Surge Voltage Protection Circuit

Routing cables outside the control cabinet
● Maintain a minimum clearance of 25 cm between cables with a high level of interference and
cables with a low level of interference.
● Using shielded cables for the following connections:
– Converter motor cable
– Signal and data cables
● Connect the motor cable shield to the motor enclosure using a PG gland that establishes a
good electrical connection.
Requirements relating to shielded cables
● Use cables with finely-stranded, braided shields.
● Connect the shield to at least one end of the cable.
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Figure 3-4 Examples for EMC-compliant shield support
● Attach the shield to the shield support directly after the cable enters the cabinet.
● Do not interrupt the shield.
● Only use metallic or metallized plug connectors for shielded data cables.
3.1.3 Electromechanical components
Surge voltage protection circuit
● Connect surge voltage protection circuits to the following components:
– Coils of contactors
– Relays
– Solenoid valves
– Motor holding brakes
● Connect the surge voltage protection circuit directly at the coil.
● Use RC elements or varistors for AC-operated coils and freewheeling diodes or varistors for
DC-operated coils.
Mounting
3.1 EMC-compliant setup of the machine or plant
SINAMICS G120XA converter
Operating Instructions, 03/2019, FW V1.0, A5E44751205B AB 43