Siemens SINAMICS S120 Manual page 254

Maintenance and servicing
7.5 Replacing components
Preparatory steps
● Disconnect the cabinet from the power supply (do not forget external power supplies!)
● Remove the guard cover
● Ensure that the power unit can be freely accessed
● If required, remove the heat exchanger so that you can better access the DC busbars
(see Section "Replacing the heat exchanger fan").
● Ensure that the mounting device for the power units is available (see Section "Mounting
device for power units")
Removal
The removal steps are numbered in accordance with the figure above.
1. Remove the connections of the busbars to the DC busbars.
2. Remove the connections to the line supply connection (Basic Line Module, Active Line
Module) or motor connection (Motor Module) and the PE connection.
3. Remove connector X9.
4. Remove the DRIVE-CLiQ connectors X400, X401, X402. Note the positions of the
DRIVE-CLiQ connectors.
5. Remove the connections to the cooling circuit; to do this, open the quick-release
couplings at the collecting pipes.
6. Remove the connecting plates and attach the guide rails of the mounting device for the
power units at the mounting points provided.
7. Remove the upper fixing nuts.
8. Remove the lower fixing nuts.
You can then pull out the power unit from the electrical cabinet.
NOTICE
Damage to the device if signal cables are damaged when removing
Signal cables can be damaged when the power unit is removed. This can cause the device
to fail.
• When removing the power unit, ensure that you do not damage any signal cables.
252
Cabinet Modules liquid cooled
Equipment Manual, 04/2020, A5E37067587A