Disassembly
Work on the Printed Circuit Boards
i
i
NOTE
Before carrying out the following steps, make sure 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.
²
If such changes are necessary, the changes should be clearly and fully noted on the device. Self adhe-
sive 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 working area. Provide a grounded mat for protecting components subject to damage from elec-
trostatic 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 additional interfaces at locations “B”and “D” apart from interfaces at locations “A” and “C”,
the screws located diagonally to the interfaces must be removed. This is not necessary if the device is
designed for surface mounting.
•
Remove the four or six caps on the front cover and loosen the screws that become accessible.
•
Carefully take off the front cover. With device versions with a detached operator panel it is possible to
remove the front cover of the device right after having unscrewed all screws.
Work on the Plug Connectors
!
CAUTION
Mind electrostatic discharges
Non–observance can result in minor personal injury or material damage.
²
When working on plug connectors, electrostatic discharges must be avoided by previously touching a
grounded metal part.
²
Do not plug or withdraw interface connections under power!
Here, the following must be observed:
3.1.2.2
Mounting and Commissioning
3.1 Mounting and Connections
372
SIPROTEC 4, 7SJ62/64, Manual
C53000-G1140-C207-8, Edition 08.2016
Summary of Contents for SIPROTEC 4
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