Siemens SINAMICS S120 Device Manual page 317

Preparatory steps
● Disconnect the cabinet from the power supply (do not forget the external power supplies).
● Remove the protective cover.
● Allow unimpeded access.
NOTICE
Device failure after a DC fuse trips
The neighboring DC fuses may also become damaged if a DC fuse trips. Failure to replace
all fuses at the same time can cause the device to fail.
• After a DC fuse trips, always replace all DC fuses at the same time. Always use fuses of
Note
Replacing a complete power unit
If you order a complete power unit as a replacement, make sure that only DC fuses are
used. If option L37 (DC interface including precharging input circuit) is installed in your
cabinet, the DC fuses of the spare part must be replaced with the copper lugs of the existing
power unit.
Removal steps
1. Loosen 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 enclosure (4 screws) and
remove the connection plate.
4. Remove the retaining screws for the fuse insert (1 screw).
You can now remove the fuse insert.
NOTICE
Device damage due to signal cable or plastic part damage during removal
Signal cables or plastic parts can be damaged when the fuse insert is removed. This can
cause the device to fail.
• When removing the fuse insert, ensure that you do not damage any signal cables or
You can then replace the DC fuses.
Cabinet Modules NEMA
Manual, 04/2014, A5E03586450A
the same type.
plastic parts.
Maintenance and servicing
6.4 Replacing components
317