Siemens SINAMICS S120 Equipment Manual page 448

Maintenance and Servicing
11.4 Replacing components
Preparatory steps
● Disconnect the drive line-up from the power supply
● Allow unimpeded access to the power block
● Remove the protective cover
Removal
The removal steps are numbered in accordance with the numbers in the diagram.
1. Remove the busbar (twelve screws).
2. Unscrew the connection to the DC link (eight nuts).
3. Remove the retaining screw at the top (one screw).
4. Remove the retaining screws at the bottom (two screws).
5. Disconnect the plug-in connections for the fiber-optic cables and signal cables (two
connectors).
The second plug connection for the fiber optic cables cannot be disconnected until the
power block has been pulled out slightly.
6. Remove the connection for the current transformer and associated PE connection (two
connectors).
7. Unscrew the two retaining screws for the fan and attach the equipment for assembling the
power block at this position.
You can now remove the power block.
Note
The power block weighs approx. 86 kg!
The second plug connection for the fiber optic cables cannot be disconnected until the power
block has been pulled out slightly (see Step 5).
NOTICE
Damage to the device if signal cables become damaged 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.
446
Air-cooled chassis power units
Manual, 07/2019, 6SL3097-4AE00-0BP9