Siemens SINAMICS S120 Manual page 336

Maintenance and servicing
6.4 Replacing components
NOTICE
Replacing the fuses
After a DC fuse trips, always replace all DC fuses at the same time. Only fuses of the same
type may be installed.
If you order a complete power unit as a replacement, make sure that only DC fuses are
used. If the Option L37 (DC interface including precharging input circuit) is installed in your
cabinet, the DC fuses of the replacement part must be replaced with the copper lugs of the
existing power unit.
Removal steps
1. Release the DC connections at DCP and DCN (4 screws each)
2. Remove nuts (8 screws).
3. Remove the retaining screws for the connection plate of the housing (4 screws) and
4. Remove the retaining screws for the fuse insert (1 screw).
You can now remove the fuse insert.
Note
When removing the fuse insert, make sure that no cables or plastic parts are damaged.
You can then replace the DC fuses.
Installation steps
Installing is the same as removing, however in the reverse order.
NOTICE
Pay attention to the tightening torques
The tightening torques specified in the table "Tightening torques for screw connections"
must be observed.
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remove the connection plate.
Cabinet Modules
Manual, 03/2013, A5E03263538A