Replacing The Encapsulated Fuses - Siemens SINAMICS S120 Manual

Replacement steps
1. Remove the nuts (x 4).
2. Remove the nuts (x 4).
3. Remove the nut (x 1).
The slide-in unit with the DC fuses can now be withdrawn completely.
Note
The slide-in unit with the DC fuses must be pulled out completely and placed down so that it
cannot topple over.
The screws and nuts must now be unscrewed and removed from the DC fuses as necessary
in order to change the relevant DC fuses.
Note
Frame size HX contains two DC fuses and frame size JXcontains four DC fuses.
If you order a complete power unit as a replacement, make sure that only DC fuses are
used. If option L37 (DC interface with pre-charging input circuit) is installed in your cabinet,
the DC fuses of the spare part must be replaced with the lugs of the existing power unit.
6.4.11.5

Replacing the encapsulated fuses

Preparatory steps
● Observe the "five safety rules".
● Disconnect the cabinet from the power supply (do not forget the external power supplies).
Replacement steps
1. Open the cabinet.
2. Open the fuse holder (push the flap down/up).
3. Remove the defective fuse.
4. Insert the replacement fuse.
5. Close the fuse holder (push the flap up/down).
6. Close the cabinet.
Cabinet Modules
Manual, (GH5), 05/2010, A5E03263538A
Maintenance and servicing
6.4 Replacing components
305