Siemens SINAMICS S120 Equipment Manual page 277

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 figure.
1. Remove the busbar (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-in connections for the fiber-optic cables and signal cables (2 plugs).
6. Remove the connection for the current transformer and associated PE connection
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, 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
For installation, carry out the above steps in reverse order.
CAUTION
The tightening torques specified in the table "Tightening torques for connecting current-
conducting parts" must be observed.
Carefully establish the plug-in connections and then ensure that they are secure.
The screw connections for the protective covers must only be tightened by hand.
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).
Chassis power units
Manual, (GH3), 10/2008, 6SL3097-2AE00-0BP3
The second plug connection for the fiber optic cables cannot be disconnected until the
power block has been pulled out slightly.
(2 plugs).
the power block at this position.
Maintenance and Servicing
8.4 Replacing components
277