4.2.3 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.
Installing
4.2EMC-compliant setup of the machine or plant
SINAMICS G120C Converters
Operating Instructions, 02/2023, FW V4.7 SP14, A5E34263257B AK 45
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