Siemens SINAMICS S120 Manual page 336

Maintenance and Servicing
8.4 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 (six 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
6. Remove the connection for the current transformer and associated PE connection (one
7. Unscrew the two retaining screws for the fan and attach the equipment for assembling
You can now remove the 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.
Installation steps
Installing is the same as removing, however in the reverse order.
NOTICE
Specifications for the installation
The tightening torques specified in the table "Tightening torques for screw connections"
must be observed.
Carefully insert the plug connections and 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).
334
connectors).
connector).
the power block at this position.
CAUTION
Manual, (GH3), 01/2013, 6SL3097-4AE00-0BP3
Chassis power units