Disassembly - Siemens siprotec SJ62 User Manual

Spare Parts
3.1.2.2

Disassembly

Work on the Printed
Circuit Boards
SIPROTEC 4, 7SJ62/63/64 Handbuch
C53000-G1140-C147-A, Edition 07.2015
rangement of the jumpers on the interface modules is described under side title
„RS485/RS232" and „Profibus Interface (FMS/DP) DNP3.0/Modbus". Both jumpers
must always be plugged in the same way.
As delivered from the factory, the resistors are switched out.
Spare parts can be the buffer battery that provides for storage of the data in the
battery-buffered RAM when the supply voltage fails, and the miniature fuse of the in-
ternal power supply. Their spatial position is shown in the figures of the processor
boards. The ratings of the fuse are printed on the board next to the fuse itself. When
exchanging the fuse, please observe the hints given in the SIPROTEC 4 System De-
scription in the Chapter „Maintenance" and „Corrective Action / Repairs".
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 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 name-
plates.
To perform work on the printed circuit boards, such as checking or moving switching
elements or exchanging modules, proceed as follows:
• Prepare working area. Provide a grounded mat for protecting components subject
to damage from electrostatic discharges (ESD). The following equipment is
needed:
– 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".(7SJ64). This is not necessary if the device is designed for
surface mounting.
• If the device has more communication interfaces at locations „A", „C" and/or „B" „D"
on the rear, the screws located diagonally to the interfaces must be removed. This
is not necessary if the device is designed for surface mounting.
3.1 Mounting and Connections
372