Siemens SINAMICS S120 Manual page 334

Maintenance and servicing
6.4 Replacing components
Preparatory steps
● Observe the "five safety rules".
● Disconnect the cabinet from the power supply (do not forget the external power supplies).
● Remove the protective cover.
● Allow unimpeded access.
Hazardous electrical voltage
The DC voltage may still be present for up to 5 minutes.
Replacing the front fuse
1. Unscrew and remove the screws and nuts (1) from the front DC fuse.
2. Remove the DC fuse.
Replacing the back fuse
1. Unscrew and remove the screws and nuts from the front DC fuse (1).
2. Remove the front DC fuse.
3. Unscrew and remove the screws and nuts from the rear DC fuse, which can now be
4. Remove the rear DC fuse.
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.
332
CAUTION
accessed.
Cabinet Modules
Manual, 03/2013, A5E03263538A