Siemens SINAMICS S120 Equipment Manual page 271

If a 50 mm wide module or if a DC link component with the appropriate width (e.g. Braking
Module, Control Supply Module, Voltage Clamping Module) is located at the lefthand end of
the drive line-up, then the DC link bridge including all of the screws must be removed. It is
not permissible to insert the screws without a DC link bridge.
For all other power units and DC link components (e.g. Capacitor Module) that are wider
than 50 mm, it is not permissible to remove the DC link bridge.
If this is not carefully observed, this can result in damage and accidents.
CAUTION
To ensure safe electrical separation, the 24 V supply cables and those for the DC link
connection cables must be physically separated (> 100 mm), or the 24 V cables must be
doubly insulated (e.g. light plastic-sheathed cable).
The DC link connection cables must be routed in such a way as to ensure that they are
ground-fault and short-circuit proof in accordance with DIN/VDE 0100 or suitable fuse
protection must be provided.
CAUTION
The total length of the DC link (including the connection cables) must not exceed 10 m.
Booksize cold-plate power units
Manual, (GH4), 03.2007, 6SL3097-2AJ00-0BP4
DANGER
WARNING
Accessories
13.2 DC link rectifier adapter
271