Siemens SINAMICS G220 - Potential Equalization between Control Cabinets; Electromechanical Components

• The mounting plate is connected to the control cabinet frame, PE rail and shield support
through a large surface area to establish a good electrical connection.
• For screwed connections on painted or anodized surfaces, establish a good electrical
connection by using one of the following methods:
– Serrated contact washers that cut through the painted or anodized surface
– The insulating coating (e.g. paint) at the contact locations has been removed.
4.14.3 Potential equalization between control cabinets
Description
EMC-compliant potential equalization between control cabinets is structured as follows:
• The PE rail runs through all control cabinets without any interruption.
• The frames of the control cabinets are connected at multiple locations using serrated
washers through a large surface area to establish a good electrical connection.
• In systems where the control cabinets are lined up next to one another, and which are
installed in two groups back to back, the PE rails of the two cabinet line-ups are connected
with one another at multiple locations.
4.14.4 Electromechanical components
Description
EMC-compliant installation includes overvoltage protection. Di󹪜erent components are suitable
depending on the type of voltage:
• RC elements or varistors for AC-operated coils
• Freewheeling diodes or varistors for DC-operated coils
The following components have overvoltage protection connected directly to the coil:
• Coils of contactors
• Relays
• Solenoid valves
• Motor holding brakes
Overview
Power cables with a high interference level signi󹪝cantly in󹪞uence the electromagnetic 󹪝elds in
a system or a machine.
Routing cables to be compliant with EMC is a requirement for disturbance-free operation of a
system or machine.
Application planning
4.14EMC-compliant installation
SINAMICS G220 converter
82 Operating Instructions, 04/2024, FW V6.2, A5E51781573B AB