Siemens SINAMICS S120 Manual page 266

Maintenance and servicing
6.4 Replacing components
Removal steps
The removal steps are numbered in accordance with the figure above.
1. Remove the busbars (12 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 (2
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).
Installation steps
Installing is the same as removing, however in the reverse order.
CAUTION
The tightening torques specified in the table "Tightening torques for connecting current-
conducting parts" must be observed.
Carefully establish the plug connections and then ensure that they are secure.
The fiber optic cable plugs must be remounted at their original slot. Fiber optic cables and
sockets are accordingly labeled for correct assignment (U11, U21, U31).
The screw connections for the protective covers may only be tightened by hand.
266
The second plug connection for the fiber optic cables cannot be disconnected until the
power block has been pulled out slightly.
connectors).
block at this position.
DANGER
Cabinet Modules
Manual, (GH5), 05/2010, A5E03263538A