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Mounting and Commissioning
3.1 Mounting and Connections
3.1.2.2 Disassembly
Work on the Printed Circuit Boards
Note
It is assumed for the following steps that the device is not operative.
Caution!
Caution when changing jumper settings that affect nominal values of the device:
As a consequence, the ordering number (MLFB) and the ratings on the name plate no longer match the actual
device properties.
Where such changes are necessary in exceptional cases, they MUST be marked clearly and visibly on the
device. Self-adhesive stickers are available that can be used as supplementary name plate.
To perform work on the printed circuit boards, such as checking or moving switching elements or exchanging
modules, proceed as follows:
• Prepare your workplace: prepare a suitable underlay for electrostatically sensitive devices (ESD). Also the
following tools are required:
– screwdriver with a 5 to 6 mm wide tip,
– a crosstip screwdriver for Pz size 1,
– a 5 mm socket wrench.
• Unfasten the screw-posts of the D-subminiature connectors on the back panel at location „A" and „C". This
activity does not apply if the device is for surface mounting.
• If there is an additional interface on location "B" next to the interfaces at location "A" and "C", remove the
screws located diagonally to the interfaces. This activity is not necessary if the device is designed for surface
mounting.
• Remove the covers on the front panel and loosen the screws which can then be accessed.
• Remove the front panel and tilt it to the side.
Work on the Plug Connectors
Caution!
Mind electrostatic discharges:
Non-observance can result in minor personal injury or property damage.
In order to avoid electrotrastic discharges when handling with plug connectors first touch an earthed metal
surface .
Do not plug or unplug interface connectors under voltage!
For the assembly of the boards for the housing size
3-4.
• Disconnect the plug connector of the ribbon cable between the front cover and the processor board C-CPU-
2 at the front cover itself. This is done by pushing apart the plug connector's top and bottom latches so that
the ribbon cable connector is pressed out.
• Disconnect the ribbon cables between the processor board C-CPU-2 (No. 1) and the input/output boards I/O
(according to order variant No. 2 to No. 4).
186
1
/
refer to Figure 3-3, and for the housing size
3
C53000-G1176-C159-3, Release date 05.2009
1
/
in Figure
2
SIPROTEC, 7VK61, Manual
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