Siemens SINAMICS S120 Equipment Manual page 215

The components in the drive line-up must be properly connected to the external heat sink.
The components can be arranged in one or more tiers. In a multiple-tier arrangement,
vertical installation or, in a cabinet row, side-by-side installation in different cabinet sections
is possible.
To determine the cross-section, use the DC link busbar current carrying capacity given in the
relevant technical specifications.
Multiple-tier configuration
Figure 12-3 Removing the DC link bridges (multi-tier configuration)
The DC link bridges must be removed by unscrewing the M4 screws.
Danger
When the infeed is on the right-hand side of the drive line-up, the DC link bridges on the left-
hand module of the drive line-up must be removed.
Continuation of the DC link with the DC link adapter external to the components is achieved
using single-core, finely-stranded and shielded cables that are laid so as to ensure they are
short-circuit and ground-fault proof.
Equipment Manual Booksize Cold-Plate Power Sections
Manual, (GH4), Edition 06.2005, 6SL3097-2AJ00-0BP2
12.4 Arrangement of Components and Equipment
Cabinet Design and EMC
12-15