Siemens SINAMICS S120 Device Manual page 271

Preparatory steps
● 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
"Installation device for power blocks").
Removal steps
The steps of the removal procedure correspond to the numbers shown in the previous figure.
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 ground (PE)
connection (1 plug).
7. Unscrew the 2 retaining screws for the fan and attach the installation device for the power
block at this position.
You can now remove the power block.
Dangerous 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.
Note
The power block weighs approximately 141 lb (64 kg).
NOTICE
Device damage due to signal cable damage during removal
Signal cables can become damaged when the power block is removed. This can cause the
device to fail.
• When removing the power block, ensure that you do not damage any signal cables.
• Disconnect the second plug-in connection of the fiber-optic cables only after the power
Cabinet Modules NEMA
Manual, 04/2014, A5E03586450A
DANGER
block has been withdrawn a little way (see step 5).
Maintenance and servicing
6.4 Replacing components
271