Siemens SINAMICS S120 Manual page 217

Establishing the connection
Note
Do not use cables
The use of cables instead of the factory-installed busbars is not permitted!
Note
Make sure that you do not drop any nuts, washers, or screws as this could cause damage.
1. Connect the "DC P" connection at the Basic Line Module, Module, Active Line Module or
Motor Module to the upper DC busbar (DC P) (1 x M12 screw + nut + washer; torque:
50 Nm).
2. Connect the "DC N" connection at the Basic Line Module, Active Line Module or Motor
Module to the lower DC busbar (DC N) (1 x M12 screw + nut + washer; torque: 50 Nm).
Cabinet Modules liquid cooled
Manual, 10/2015, A5E37067587A
Maintenance and servicing
7.5 Replacing components
217