Jumpers On The Printed Circuit Boards - Siemens siprotec 7SA522 User Manual

Installation and Commissioning
Type of Contact for
Binary Outputs
Serial Interfaces
8.1.3.2

Jumpers on the Printed Circuit Boards

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8-12
Input and output boards can contain relays of which the contact can be set as
normally closed or normally open contact. Therefore it is necessary to rearrange a
jumper. The paragraph "Jumpers on the Printed Circuit Boards" describes to which
type of relays in which boards this applies.
If the device is equipped with a serial RS485 port, the RS485 bus must be terminated
with resistors at the last device on the bus to ensure reliable data transmission. For
this purpose, terminating resistors are provided in 7SA522. As delivered from the fac-
tory, the resistors are switched out. Two jumper positions must be changed to switch
in the resistors. The jumper positions and the corresponding states of the resistors are
covered below, "Jumpers on the Printed Circuit Boards". Both jumpers must always
be set in the same position.
If changes to jumper settings are required to modify the rating of the power supply, the
nominal rating of the current input transducers, the pick-up voltage of binary inputs, or
the state of the terminating resistors, proceed as follows:
Caution!
Jumper-setting changes that affect nominal values of the device render the ordering
number and the corresponding nominal values on the nameplate sticker invalid. If
such changes are necessary, the changes should be clearly and fully noted on the de-
vice. Self adhesive stickers are available that can be used as replacement name-
plates.
Prepare area of work. 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,
− #1 Phillips screwdriver,
− 4.5 mm socket or nut driver.
Unfasten the screw-posts of the D-subminiature connector on the back panel at loca-
tion "A". This activity does not apply if the device is for surface mounting.
If the device has more communication interfaces at locations "B" to "E" on the rear, the
screws located diagonally to the interfaces must be removed. This activity is not nec-
essary if the device is for surface mounting.
Remove the four or six caps on the front cover and loosen the screws that become
accessible.
Carefully pull off the front cover. The front cover is connected to the CPU board with
a short ribbon-cable.
Refer to Figures 8-7 and 8-8 for the physical arrangement of the printed boards.
7SA522 Manual
C53000-G1176-C119-2