Siemens SINAMICS S120 Manual page 292

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 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 plug).
7. Unscrew the 2 retaining screws for the fan and attach the installation device for the power
You can now remove the power block.
Hazardous electrical voltage
Up to 1200 V may still be present on the DC busbar system 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 system when replacing a power block!
Caution when removing
The power block weighs approx. 64 kg!
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).
290
titled "Installation device for power blocks").
block at this position.
DANGER
CAUTION
Cabinet Modules
Manual, 03/2013, A5E03263538A