3 Mounting and Commissioning
346
7UT613/63x Manual
C53000-G1176-C160-2
To change the switching threshold of a binary input, one jumper must be changed for
each input. The physical arrangement of the binary input jumpers in relation to the
pickup voltages is explained below under margin headings „Processor Board C-CPU-
2“ and „Input/Output Board(s) C-I/O-1 and C-I/O-10“.
Note
If binary inputs are used for trip circuit supervision, note that two binary inputs (or a
binary input and a substitute resistor) are connected in series. The switching threshold
must lie clearly below half
of the nominal control voltage.
Contact Mode for
Binary Outputs
Some input/output modules can have relays which can be set to have either NO or
NC contacts. To do so a jumper location must be changed. For which relays on which
boards this is valid can be found in the following sections under “Switching Elements
on Printed Circuit Boards”.
Replacing Inter-
face Modules
The serial interface modules can be replaced. For details please refer to the section
„Interface Modules“.
Terminating Serial
Interfaces
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 on the interface board and on the in-
terface modules, which can be connected with jumpers. The physical arrangement
and jumper positions on the interface module are described below under margin
heading „RS485 Interface“.
Spare parts Spare parts may be the backup battery that maintains the data in the battery-buffered
RAM when the voltage supply fails, and the miniature fuse of the internal power
supply. Their physical location is shown in the illustration of the processor board.
The ratings of the fuse are printed on the board next to the fuse itself (also see table
3-2).
When exchanging the fuse, please observe the hints given in the SIPROTEC System
Manual /1/ in the section „Maintenance“.
3.1.2.2 Disassembly
Disassembly of the
Device
Note
It is assumed for the following steps that the device is not operative.
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