Potential Equalization Between Control Cabinets; Electromechanical Components - Siemens SINAMICS S200 Operating Instructions Manual

Pulse train servo drive system

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• 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.

Potential equalization between control cabinets

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.

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

• Solenoid valves

• Motor holding brakes

SINAMICS S200 pulse train servo drive system with SIMOTICS S-1FL2

Operating Instructions, 11/2023, FW V6.3, A5E51646767B AA

Application planning

4.8 EMC-compliant installation