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Mounting and Commissioning
3.1 Mounting and Connections
Note
If in exceptional cases the current ratings are changed, you have to inform the device of these changes by en-
tering the new values in address 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 nec-
essary to change the switching threshold of the binary inputs.
A jumper position has to be changed to adjust the switching threshold of a binary input. The assignment 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 module C-I/O-1".
Note
If binary inputs are used for trip circuit supervision, please note that two binary inputs (or a binary input and a
bypass resistance) are connected in series. The switching threshold must lie clearly below half the nominal
control voltage.
Type of Contact for Output Relays
Some input/output boards can contain relays whose contacts can be set to have normally closed or normally
open contacts. To do so, you have to move a jumper. The following sections under „Switching Elements on
Printed Circuit Boards" describe for which relays on which boards this is the case.
Exchanging Interfaces
The serial interfaces can only be replaced in devices designed for panel flush and cubicle mounting and for
surface-mounted devices with a detached operator panel. The following section under margin heading „Replac-
ing Interface Modules" describes which interfaces can be exchanged, and how this is done.
Terminating interfaces with bus capability
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 transmission. For this purpose, terminating resistors are provided
on the interface board that can be connected with jumpers. The spatial arrangement of the jumpers on the in-
terface modules is described in the following sections under the side titles „RS485 Interface" and „Profibus In-
terface". Both jumpers must always be plugged in the same way.
The termination resistors are disabled on delivery.
Spare parts
The backup battery receives the data stored in the battery-backed RAM in the event that the voltage supply
fails. Their spatial arrangement is shown in the figure of the processor board (Figure 3-10). The miniature fuse
of the internal power supply is located on the board C-I/O-1 (Figure 3-5). The ratings of the fuse are printed on
the board next to the fuse. When replacing the fuse, please observe the guidelines given in the SIPROTEC 4
System Description in the chapter „Maintenance" and „Repair".
502
SIPROTEC, 7SD5, Manual
C53000-G1176-C169-5, Release date 02.2011
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