Siemens SINAMICS S120 Manual page 263

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 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 (6 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 (1
7. Unscrew the 2 retaining screws for the fan and attach the installation device for the power
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.
The second plug connection for the fiber optic cables cannot be disconnected until the
power block has been pulled out slightly (see Step 5).
Cabinet Modules
Manual, (GH5), 05/2010, A5E03263538A
titled "Installation device for power blocks").
plug).
block at this position.
DANGER
Maintenance and servicing
6.4 Replacing components
263