Replacing Power Units - Siemens SINAMICS S120 Manual

6.4.5

Replacing power units

The components required for connecting the DC busbars to the power unit are supplied as
standard. If a components is replaced, you may have to restore these connections. The
connection procedure is described in the following section.
Preparatory steps:
● Observe the "five safety rules".
● Disconnect the cabinet from the power supply (do not forget the external power supplies).
● The cabinet units must be installed and securely mounted
● Allow unimpeded access to the DC busbars
Establishing the connection for booksize format
Note
Make sure that you do not drop any nuts, washers, or screws as this could cause damage.
1. Connect the "DC P" connection on the Motor Module to the upper DC busbar (DC P) (1 x
2. Connect the "DC N" connection on the Motor Module to the lower DC busbar (DC N) (1 x
Cabinet Modules
Manual, (GH5), 05/2010, A5E03263538A
(if necessary, remove the protective covers during installation work)
Figure 6-3 Connection to the DC busbar on the Basic Line Module, Smart Line Module, Active
Line Module and Motor Module in the chassis format
M12 screw + nut + washer; torque: 50 Nm).
M12 screw + nut + washer; torque: 50 Nm).
Maintenance and servicing
6.4 Replacing components
249