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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: provide a suitable pad for electrostatically sensitive devices (ESD). Also the follow-
ing 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". This activity
does not apply if the device is for surface mounting.
• If the device has more communication interfaces in addition to the interface at location „A", the screws
located diagonally must be removed. This step is not necessary if the device is designed for surface mount-
ing.
• Remove the covers on the front panel and loosen the screws which can then be accessed.
• Pull off the front cover and carefully remove it to one 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 electrostatic discharges when handling plug connectors, first touch an earthed metal surface.
Do not plug or unplug interface connectors under voltage!
SIPROTEC, 7SD5, Manual
C53000-G1176-C169-5, Release date 02.2011
Mounting and Commissioning
3.1 Mounting and Connections
503
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