Electromechanical Components - Siemens SINAMICS G120 Hardware Installation Manual

Installing/mounting
4.1 EMC-compliant installation of a machine or system
Figure 4-4
Further information
Additional information about EMC-compliant installation is available in the Internet:
60612658/en)
4.1.3

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.
24
Grounding and high-frequency equipotential bonding measures in the control cabinet and
in the plant/system
EMC installation guideline (https://support.industry.siemens.com/cs/ww/de/view/
Hardware Installation Manual, 04/2021, A5E36265179B-AB
PM250 Power Module