Siemens SINAMICS S120 Equipment Manual page 451

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. Unscrew the connection to the line or to the motor (eight 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 (three
connectors).
6. Remove the connection for the current transformer and associated PE connection (one
connector).
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. 90 kg!
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.
Installation steps
To reinstall, perform the above steps in reverse order.
Note
Specifications for the installation
The tightening torques specified in the table "Tightening torques for screw connections" must
be observed.
Carefully insert the plug-in 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 labeled to ensure that they are assigned correctly (U11, U21, U31).
Air-cooled chassis power units
Manual, 07/2019, 6SL3097-4AE00-0BP9
Maintenance and Servicing
11.4 Replacing components
449