Siemens SINAMICS G120C Operating Instructions Manual page 43

Control cabinet assembly
• Connect the door, side panels, top and base plate of the control cabinet with the control
cabinet frame using one of the following methods:
– Electrical contact surface of several cm² for each contact location
– Several screw connections
– Short, finely stranded, braided copper wires with cross-sections
• Install a shield support for shielded cables that are routed out of the control cabinet.
• Connect the PE bar and the shield support to the control cabinet frame through a large
surface area to establish a good electrical connection.
• Mount the control cabinet components on a bare metal mounting plate.
• Connect the mounting plate to the control cabinet frame and PE bar and shield support
through a large surface area to establish a good electrical connection.
• For screw connections onto painted or anodized surfaces, establish a good conductive
contact using one of the following methods:
– Use special (serrated) contact washers that cut through the painted or anodized surface.
– Remove the insulating coating at the contact locations.
Measures required for several control cabinets
• Install equipotential bonding for all control cabinets.
• Screw the frames of the control cabinets together at several locations through a large surface
area using serrated washers to establish a good electrical connection.
• In plants and systems where the control cabinets are lined up next to one another, and which
are installed in two groups back to back, connect the PE bars of the two cabinet groups at as
many locations as possible.
SINAMICS G120C Converters
Operating Instructions, 02/2023, FW V4.7 SP14, A5E34263257B AK
≥ 95 mm² / 000 (3/0) (‑2) AWG
4.2 EMC-compliant setup of the machine or plant
Installing
41