Hardware Modifications; General - Siemens siprotec 7SA6 User Manual

8.1.3

Hardware Modifications

8.1.3.1

General

Power Supply
Voltage
Life Contact
Nominal Currents
Control Voltages
for Binary Inputs
7SA6 Manual
C53000-G1176-C133-1
Hardware modifications might be necessary or desired. For example, a change of the
pick-up threshold for some of the binary inputs might be advantageous in certain
applications. Terminating resistors might be required for the communication bus. In
either case, hardware modifications are needed. The modifications are done with
jumpers on the printed circuit boards inside the 7SA6. Follow the procedure described
in Subsubsection 8.1.3.2 to 8.1.3.5, whenever hardware modifications are done.
There are different ranges for the power supply voltage of the various power supplies.
Refer to the data for the 7SA6 ordering numbers in Section A.1 of the Appendix. The
power supplies with the ratings DC 60/110/125 V and DC 110/125/220 V-, AC115 are
interconvertible. Jumper settings determine the rating. The assignment of these
jumpers to the supply voltages is described in Subsubsection 8.1.3.3, see "Processor
Board C-CPU-2". When the relay is delivered, these jumpers are set according to the
name-plate sticker. Generally, they need not be altered.
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 connections F3 and F4 (or
corresponding terminals on housings for panel surface mounting) via a plug-in jumper
(X40). The assignment of the plug-in jumper to the type of contact and the location of
the jumper is described in Subsubsection 8.1.3.3, see "Processor Board C-CPU-2".
The input transformers of the device are set to a nominal current of 1 A or 5 A with
jumpers. The position of the jumpers are set according to the name-plate sticker. The
assignment of the jumpers to the nominal rate and the arrangement of the jumpers is
described in 8.1.3.3, see "Input/Output Board C–I/O–2" or "Input/Output Board C–I/O–
11". All jumpers must be set for the same nominal current, i.e. a jumper (X61 to X64)
one jumper for each input transformer and additionally one jumperX 60.
Note:
If nominal current ratings are changed exceptionally, then the new ratings must be
registered in address  &7 6(&21'$5< in the 3RZHU 6\VWHP 'DWD 
36\VWHP 'DWD  (see Subsection 6.1.1).
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 general, to
optimize the operation of the inputs, the pick-up voltage of the inputs should be set to
most closely match the actual control voltage being used. Each binary input has a
pick-up voltage that can be independently adjusted; therefore, each input can be set
according to the function performed.
A jumper position is changed to adjust the pick-up voltage of a binary input. The
physical arrangement of the binary input jumpers in relation to the pick-up voltages is
described in 8.1.3.3.
Installation and Commissioning
8-13