Siemens siprotec 7SA6 User Manual page 559

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7SA6 Manual
C53000-G1176-C133-1
If there are additional interfaces on location "B" and "D" next to the interfaces at
location "A" to "C", remove the screws located diagonally to the interfaces. This activity
is not necessary if the device is for surface mounting.
Remove the four or six caps on the front cover and loosen the screws that become
accessible.
Carefully take off the front cover. The front cover is connected to the CPU board with
a short ribbon-cable. With device versions with a detached operator panel it is possible
to remove the front cover of the device right after having unscrewed all screws.
Caution!
Electrostatic discharges through the connections of the components, wiring, plugs,
and jumpers must be avoided. Wearing a grounded wrist strap is preferred. Otherwise,
first touch a grounded metal part.
Disconnect the ribbon cable between the front cover and the C-CPU-2 board (å) at
the front cover side. To disconnect the cable, push up the top latch of the plug
connector and push down the bottom latch of the plug connector. Carefully draw out
the plug connector.
This action does not apply to the device version with detached operator panel.
However, on the central processor unit C-CPU-2 (å) the 7-pole plug connector X16
behind the D-subminiture connector and the plug connector of the ribbon cable
(connected to the 68pole plug connector on the rear side) must be removed.
Disconnect the ribbon cables between the C-CPU-2 unit (å) and the input/output
printed circuit boards (depending on the version to ƒ).
Remove the boards and set them on the grounded mat to protect them from ESD
damage. A greater effort is required to withdraw the C-CPU-2 board, especially in
versions of the device for surface-mounting, because of the communication
connectors.
Check the jumpers according to Figures 8-11 to 8-16 and the following information
Change or remove the jumpers as necessary.
The order of the boards for housing size
1
refer to Figure 8-9 and housing size
/
2
Installation and Commissioning
1
is shown in Figure 8-8, for housing size
/
3
1
in Figure 8-10.
/
1
8-15