Siemens SINAMICS G150 Operating Instructions Manual page 554

Maintenance and servicing
11.4 Replacing components
Preparatory steps
● Disconnect the cabinet unit from the power supply.
● Allow unimpeded access to the power block.
● Remove the protective cover.
Removal steps
The removal steps are numbered in accordance with the numbers in the diagram.
1. Remove the busbar (6 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 (3 plugs).
6. Remove the connection for the current transformer and associated PE connection (1
7. Remove the connection for the DC link sensor (1 nut).
8. Remove the power connections (6 screws).
9. Unscrew the two retaining screws for the fan and attach the tool for de-installing the
You can now remove the power block.
The power block weighs approx. 94 kg!
When removing the power block, ensure that you do not damage any signal cables.
Installation steps
Installation is the same as removing, however in the reverse order.
CAUTION
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.
NOTICE
Connection clip to the interference-suppression capacitor
The connection clip to the interference suppression capacitor is mounted on the spare
power block together with a yellow warning label.
Please note the information in Chapter "Removing the connection clip to the interference
suppression capacitor for operation on an ungrounded line supply (IT system)".
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plug).
power block at this position.
CAUTION
Converter cabinet units
Operating Instructions, 03/2012, A5E03263466A