Disassembly - Siemens SIPROTEC 7UM62 Manual

Spare Parts
Spare parts may be the backup battery that maintains the data in the battery-buffered RAM when the voltage
supply fails, and the miniature fuse of the internal power supply. Their physical location is shown in Figure 3-3.
The ratings of the fuse are printed on the board next to the fuse itself. When replacing the fuse, please observe
the guidelines given in the SIPROTEC 4 System Manual /1/ in the chapter „Maintenance" and „Corrective
Action / Repairs".

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 stick-
ers 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: Provide 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 Phillips 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 the 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 then accessible.
• Remove the front panel and tilt it to the side.
SIPROTEC, 7UM62, Manual
C53000-G1176-C149-7, Release date 03.2010
Mounting and Commissioning
3.1 Mounting and Connections
367