Siemens SINAMICS S120 Equipment Manual page 247

Removal steps
The removal steps are numbered in accordance with the figure above.
1. Unscrew the connection to the supply system or the motor (6 screws). If necessary,
2. Unscrew the connection to the DC link (4 screws). If necessary, loosen the busbars and
3. Remove the retaining screws at the top (2 screws).
4. Remove the retaining screws at the bottom (2 screws).
5. Remove the DRIVE-CLiQ cables and connections to the CU320 (cables to the customer
6. Remove the mounts for the slide-in electronics unit (2 nuts) and carefully remove the unit.
7. Disconnect the plug connections for the fiber optic cables and signal cables (5 plugs).
8. Remove the plug and, if necessary, the cable connection for the thermocouple.
9. Unscrew the two retaining screws for the fan and attach the installation device for the
You can now remove the power block.
Up to 1200 V may still be present on the DC busbars 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 when replacing a 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 7).
S120 Cabinet Modules Equipment Manual
Manual, (GH5), 10/2008, A5E00427098A
loosen the busbars and turn them to the side.
turn them to the side.
interface and, if necessary, the PROFIBUS plug and connection to the operator panel
(-X140 on the CU320)).
When removing the slide-in electronics unit, 5 additional plugs (2 at the top, 3 at the
bottom) must be removed one after the other.
power block at this position.
DANGER
Maintenance and servicing
6.4 Replacing components
247