Siemens SINAMICS S120 Manual page 67

Preparatory steps
● Verify that the cabinet units to be connected have been isolated from the supply.
● Install and secure the cabinet units properly.
● Observe the "five safety rules".
● Allow unimpeded access to the DC busbar
Note
Connecting the DC busbar from the top
In some cases, it is far simpler to connect the DC busbar from the top – with the hood or top
cover removed – than from the front.
Figure 4-2
Establishing the connection
1. Loosen the 2 x M12 nuts on the upper DC busbar (DC P) on the right side of the first
2. Loosen the 2 x M12 nuts on the DC busbar on the left side of the second cabinet.
3. Withdraw jumper
4. Re-tighten the nuts on the DC busbar in both cabinet units
5. Repeat steps 1 to 4 for the lower DC busbar (DC N).
Cabinet Modules
Manual, (GH5), 05/2010, A5E03263538A
(if necessary, remove the protective covers during installation work).
Connecting the DC busbar when cabinet units are installed side-by-side
cabinet.
①
from the DC busbar in the first cabinet and slide it into the DC
busbar of the second cabinet as far as it will go
(torque: 50 Nm).
Electrical installation
4.4 Connections
67