Siemens SIPROTEC 7SD80 Manual page 238

Mounting and Commissioning
3.1 Mounting and Connections
Note
In order to minimize the expenditure for reconnecting the device, remove the completely wired terminal blocks
from the device. To do so, open the elastic holders of the terminal blocks in pairs with a flat screwdriver and
remove the terminal blocks to the back. When reinstalling the device, insert the terminal blocks back into the
device like assembled terminals (Sections Panel Flush Mounting, Panel Surface Mounting or Cubicle Mount-
ing).
In order to install or exchange communication modules or to replace the fuse, proceed as follows:
Remove the two covers at the top and bottom. Thus, 1 housing screw each at the top and bottom becomes
accessible. First, only unscrew the bottom housing screw so far that its tip no longer looks out of the thread of
the mounting bracket (the housing screws are captive, they remain in the front cover even when unscrewed).
Unscrew all screws that fasten any existing communication modules in the module cover on the bottom side of
the device. Also unscrew the 4 countersunk screws that fasten the module cover on the bottom side of the
device. Carefully pull the entire module cover out of the device.
First fully unscrew the two housing screws in the top and bottom part of the covering cap and carefully pull the
entire electronic block out of the housing (see "Installation or replacement of a SIPROTEC 4 communication
module" in the "Interface Modules" section).
Note
If you have not removed the terminal blocks from the rear panel, much more force is required for removing and
reinstalling the electronics block, which might lead to the damaging of the device. Therefore, we absolutely rec-
ommend to remove the terminal blocks before removing the electronics block.
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SIPROTEC, 7SD80, Manual
E50417-G1140-C474-A1, Release date 09.2011