3 Mounting and Commissioning
212
7ST6 Manual
E50417-G1176-C251-A3
3.1.2
Hardware Modifications
3.1.2.1
General
A subsequent adaptation of the hardware to the power system conditions can, for ex-
ample, become necessary with regard to the control voltage for binary inputs or the
termination of bus-capable interfaces. Follow the procedure described in this section,
whenever hardware modifications are done.
Auxiliary Voltage
There are different input voltage ranges for nominal voltage. The versions for
60/110/125 VDC and 110/125/220/250 VDC are interchangeable by altering jumper
settings. The assignment of these jumpers to the nominal voltage ranges and their
spatial arrangement on the PCB are described further below at „Processor Board C-
CPU-2“. Location and ratings of the miniature fuse and the buffer battery are also
shown. When the device is delivered, these jumpers are set according to the name-
plate sticker and generally need not be altered.
Life Contact
The life contact of the device is a changeover contact from which either the NC contact
or the NO contact can be connected to the device terminals via a plug-in jumper (X40).
Assignments of the jumpers to the contact type and the spatial layout of the jumpers
are described in Section at margin heading „Processor Board C-CPU-2“.
Rated Currents
The rated currents can be 1 or 5 A depending on the variant ordered.
Control Voltage for
Binary Inputs
When the device is delivered from the factory the binary inputs are set to operate with
a voltage that corresponds to the rated DC voltage of the power supply. In case of de-
viating nominal values of the power system control voltage, it may become necessary
to change the switching threshold of the binary inputs.
To change the switching threshold of a binary input, one jumper must be changed for
each input. The assignments of the jumpers to the binary inputs and the spatial layout
of the jumpers is described in the following sections under „Processor Board C-CPU-
2“, Board C-I/O-7, „Board(s) C-I/O-12 and C-I/O-13“ and „Board B-I/O-2“.
Note
If binary inputs are used for trip circuit monitoring, note that two binary inputs (or a
binary input and a substitute resistor) are connected in series. The switching threshold
must be significantly less than half the rated control voltage.
Contact Mode for
Binary Outputs
Depending on the version, some output relays can be set to have normally closed or
normally open 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“.
Termination of
Serial Interfaces
If the device is equipped with a serial RS 485 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 PCB of the C-CPU-2
processor boards and on the RS 485 or PROFIBUS interface module which can be
connected via jumpers. The spatial arrangement of the jumpers on the PCB of the pro-
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