Siemens SINAMICS S120 Manual page 296

Maintenance and servicing
6.4 Replacing components
Installation steps
Installing is the same as removing, however in the reverse order.
NOTICE
Specifications for installation
The tightening torques specified in the table "Tightening torques for screw connections"
must be observed.
Carefully insert the plug connections and ensure that they are secure.
The fiber optic cable plugs must be remounted at their original slot. Fiber optic cables and
sockets are accordingly labeled for correct assignment (U11, U21, U31).
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Cabinet Modules
Manual, 03/2013, A5E03263538A