Siemens SIPROTEC 7VU681, User Manual

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Mounting And Commissioning
3.1 Mounting And Connections
SIPROTEC, 7VU681, User Manual
C53000-G1176-C368-1, Release Date 07.2012 63
3.1.2.2 Disassembly
Disassembly of the Device
Note
It is assumed for the following steps that the device is not in operation.
Caution !
Caution when changing jumper settings that affect nominal values of the device
As a consequence, the ordering number (MLFB) and the ratings that are stated on the nameplate do no longer
match the actual device properties.
If such changes are necessary, the changes should be clearly and fully noted on the device. Self adhesive
stickers are available that can be used as replacement nameplates.
To perform work on the printed circuit boards, such as checking or moving switching elements or exchanging
modules, proceed as follows:
• Prepare area of work: Preparing a surface appropriate to electrostatic sensitive devices (EGB). In addition
to this, the following tools are required:
- screwdriver with a 5 to 6 mm wide tip
- a Philips screwdriver size 1
- 5 mm socket or nut driver
• 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 the device has additional communication interfaces at locations "A", "C" and/or "B" "D" on the rear, the
screws located diagonally to the interfaces must be removed. This activity does not apply if the device is
for surface mounting.
• Remove the caps on the front cover and loosen the screws that become accessible.
• 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 material damage.
When handling with plug connectors, electrostatic discharges may emerge by previously touching an earthed
metal surface must be avoided.
Do not plug or withdraw interface connections under power!