Siemens SINAMICS S120 Device Manual page 74

Electrical installation
4.5 Connections
Preparatory steps
● Install and secure the cabinet units properly.
● Disconnect the cabinet units from the power supply.
● Allow unimpeded access to the PE busbar of the cabinet units (if necessary, remove the
protective covers during installation work).
Figure 4-3
Establishing the connection
1. Loosen the 1 x M12 nut (1) of the PE busbar at the first cabinet.
2. Remove the nut (1), washer and screw (3).
3. Loosen the 1 x M12 nut of the PE busbar on the second cabinet.
4. Remove the nut, washer, and screw.
5. Place the connection jumper (2) at the back on the PE busbar of the cabinet units to be
connected.
6. Insert the screws in the ground straps of the PE busbar from the front.
7. Reattach the washers and nut.
8. Tighten the nut (tightening torque: 50 Nm).
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Connecting the PE busbar when cabinet units are installed side-by-side
Cabinet Modules NEMA
Manual, 04/2014, A5E03586450A