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Application planning
4.14 EMC-compliant installation
• 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. Different 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 significantly influence the electromagnetic fields 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.
82
Operating Instructions, 04/2024, FW V6.2, A5E51781573B AB
SINAMICS G220 converter
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