Siemens SIPROTEC 7SJ61 Manual page 263

Control Voltage for Binary Inputs
When the device is delivered from the factory, the binary inputs are set to operate with a voltage that corre-
sponds to the rated DC voltage of the power supply. In general, to optimize the operation of the inputs, the
pickup voltage of the inputs should be set to most closely match the actual control voltage being used.
A jumper position is changed to adjust the pickup voltage of a binary input. The assignment of the plug-in
jumpers to the contact type and the spatial arrangement of the jumpers are described in the following sections.
Note
If binary inputs are used for trip circuit monitoring, please note that two binary inputs (or one binary input and
one replacement resistor) must be connected in series. The switching threshold must lie significantly below half
the nominal voltage.
Contact Mode for Binary Outputs
Input/output boards can have relays that are equipped with changeover contacts. Therefore it is necessary to
rearrange a jumper. To which relays of which boards this applies is described in the following sections.
Replacing Interfaces
Only serial interfaces of devices for panel and cubicle flush mounting are replaceable. Which interfaces can be
exchanged, and how this is done, is described in the following section under the margin heading "Exchanging
Interface Modules".
Termination of Bus-capable Interfaces
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 PCB of the CPU processor module and on the RS485 or PROFIBUS interface module which can be
connected via jumpers. Here, only one option can be used. The physical arrangement of the jumpers on the
PCB of the corresponding processor board CPU is described in the following sections under margin heading
„Processor Board CPU". The arrangement of the jumpers on the interface modules is described under margin
heading „RS485/RS232" and „Profibus Interface (FMS/DP) DNP3.0/Modbus". Both jumpers must always be
plugged identically.
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 supply voltage fails, and the miniature fuse of the internal power supply. Their physical arrangement is
shown in the figures of the processor boards. The ratings of the fuse are printed on the board next to the fuse.
When exchanging the fuse, please observe the hints given in the SIPROTEC 4 System Description under
"Maintenance" and "Corrective Action / Repairs".
SIPROTEC, 7SJ61, Manual
C53000-G1140-C210-1, Release date 02.2008
Mounting and Commissioning
3.1 Mounting and Connections
263