Installing
3.2 EMC-compliant installation of a machine or system
Power Module PM240-2
Hardware Installation Manual, 01/2020, A5E33294624B AL
27
Requirements relating to shielded cables
● Use cables with finely-stranded, braided shields.
● Connect the shield to at least one end of the cable.
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.
3.2.3 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.
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