3 Mounting and Commissioning
452
7SD5 Manual
C53000-G1176-C169-1
Note
If nominal current ratings are changed exceptionally, then the new ratings must be reg-
istered in addresses 206 CT SECONDARY in the power system data (see Section
2.1.2.1).
Control Voltage for
Binary Inputs
When the device is delivered the binary inputs are set to operate with a voltage that
corresponds to the nominal voltage of the power supply. If the nominal values differ
from the power system control voltage, it may be necessary to change the switching
threshold of the binary inputs.
Jumper positions can be changed to adjust the pickup voltage of a binary input. The
assignments of the jumpers to the binary inputs and the spatial arrangement of the
jumpers are described in the following section under the margin heading „Input/Output
Board(s) C-I/O-1 and C-I/O-10“.
Note
If binary inputs are used for trip circuit monitoring, note that two binary inputs (or a
binary input and an equivalent resistance) are connected in series. The switching
threshold must lie clearly below halben
of the nominal control voltage.
Contact Mode for
B i n a r y O u t p u t s
Input/output boards can have relays that are equipped with changeover contacts. For
this it is necessary to alter a jumper. The following sections at „Switching Elements on
Printed Circuit Boards“ explain for which relays on which boards this applies.
Exchanging
I n te r f a c es
Only serial interfaces of devices for panel flush and cubicle mounting as well as of
mounting devices with detached operator panel are replaceable. In the following
section under margin heading „Exchanging Interface Modules“ it is described which
interfaces can be exchanged, and how this is done.
Termination of
S e r i a l I n t e r f a c e s
If the device is equipped with a serial RS485 interface or PROFIBUS, they must be
terminated with resistors at the last device on the bus to ensure reliable data transmis-
sion. For this purpose, terminating resistors are provided on the interface modules that
can be connected with jumpers. The spatial arrangement of the jumpers on the inter-
face board is described in the following sections under the margin headings „RS485
Interface“ and „PROFIBUS Interface“.
The terminating resistors are disabled on delivery.
Spare Parts Spare parts can be the buffer battery that provides for storage of the data in the
battery-buffered RAM when the voltage supply fails, and the miniature fuse of the in-
ternal power supply. Their spatial arrangement is shown in the figure of the processor
board. 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 in the chapter „Maintenance“ and „Corrective Action / Repairs“.
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