Siemens SINAMICS S120 Equipment Manual page 259

Preparatory steps
● Observe the "five safety rules".
● Remove the protective cover.
● Allow unimpeded access to the power block.
● Set up the installation device for the power block and keep it at hand (see the section
Removal steps
The removal steps are numbered in accordance with the figure above.
1. Remove the busbar (8 screws).
2. Unscrew the connection to the DC link (8 nuts).
3. Remove the retaining screw at the top (1 screw).
4. Remove the retaining screws at the bottom (2 screws).
5. Disconnect the plug connections for the fiber optic cables and signal cables (2 plugs).
6. Remove the connection for the current transformer and associated PE connection
7. Unscrew the two retaining screws for the fan and attach the installation device for the
You can now remove the power block.
Up to 1200 V may still be present on the DC busbars even after the DC interface (option
L37) has been switched off. For this reason, take particular care to avoid coming into
contact with the DC busbar when replacing a power block.
CAUTION
When removing the power block, ensure that you do not damage any signal cables.
S120 Cabinet Modules Equipment Manual
Manual, (GH5), 10/2008, A5E00427098A
titled "Installation device for power blocks").
(1 plug).
power block at this position.
DANGER
Maintenance and servicing
6.4 Replacing components
259