Hardware Modifications; General - Siemens SIPROTEC 4 7UT6 Series Manual

Mounting and Commissioning
3.1 Mounting and Connections
R = 53 kΩ
max
[mi-ausloesekreis-beispwiderstand2-021026-rei, 1, en_GB]
R = 27 kΩ
min
[mi-ausloesekreis-beispwiderstand3-021026-rei, 1, en_GB]
The closest standard value of 39 k is selected; the power is:
[mi-ausloesekreis-beispleistung-021026-rei, 1, en_GB]
P ≥ 0,3 W
R
RTD-Box
If the overload protection operates with processing of the coolant temperature (overload protection with
hotspot calculation), one or two RTD boxes 7XV5662-xAD can be connected to the serial service interface at
port C.

Hardware Modifications

3.1.2
3.1.2.1

General

Hardware modifications concerning, for instance, nominal currents, the control voltage for binary inputs or
termination of serial interfaces might be necessary. Follow the procedure described in this subsection, when-
ever hardware modifications are done.
Auxiliary Voltage
There are different input ranges for the power supply voltage (refer to the data ordering information in the
Appendix). The power supplies with the ratings DC 60 V/110 V/125 V and DC 110 V/125 V/220 V/250 V / AC
115 V/230 V are interconvertible. Jumper settings determine the rating. The assignment of these jumpers to
the supply voltages and their physical location on the PCB are described below under "CPU Processor Board".
When the device is delivered, these jumpers are set according to the name-plate sticker and generally need
not be altered.
Rated Currents
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.
If the current transformer sets at the measuring locations and/or the 1-phase measurement inputs have
different secondary rated currents, this must be adapted in the device. The same applies for the current trans-
formers of the various busbar feeders when single-phase busbar protection is applied. Using single-phase
busbar protection with interposing summation transformers, the rated currents are usually 100 mA.
The assignment of the jumpers to the current rating and their physical arrangement on the PCB are described
below under margin heading "Input/Output Board A-I/O-3 (only 7UT612)", "Input/Output Board C-I/O-2", "Input/
Output Board C–I/O-9 (all versions)" and " Input/Output Board C–I/O-9 (only 7UT635)".
When performing changes, please make sure that the device is always informed about them:
314 SIPROTEC 4, 7UT6x, Manual
C53000-G1176-C230-5, Edition 09.2016