Siemens SIPROTEC 4 7UT6 Series Manual page 18

Introduction
1.1 Overall Operation
Front Elements
Devices with operator panel have light emitting diodes (LEDs) and a display screen (LCD) on the front panel to
provide information such as measured values, messages related to events or faults, status, and functional
status.
Integrated control and numeric keys in conjunction with the LCD facilitate local interaction with the 7UT6. All
information of the device can be accessed using the integrated control and numeric keys. The information
includes protective and control settings, operating and fault messages, and measured values.
In addition, control of circuit breakers and other equipment is possible from the 7UT6 front panel.
The versions 7UT612 and 7UT613 have a 4-line LC display in front, whereas the versions 7UT633 and 7UT635
have a graphic display. The latter devices also have integrated keyswitches and control buttons for on-site
control.
Serial interfaces
Via the serial operator interface in the front panel, communication with a personal computer using the oper-
ating program DIGSI is possible. This facilitates a comfortable handling of all device functions.
A serial service interface can likewise make communication via PC with the device possible by using DIGSI.
This port is especially well suited for the fixed wiring of the devices to the PC or operation via a modem.
All data can be transferred to a central control or monitoring system via the serial system port. This interface
may be provided with various protocols and physical transmission schemes to suit the particular application.
A further interface is provided for the time synchronization of the internal clock via external synchronization
sources.
Further communication protocols can be realized via additional interface modules.
The service port, or an optional additional interface, can also be used to connect a RTD-Box (= resistance
temperature detector) for entering external temperatures (e.g. for overload protection). The additional inter-
face is available for all 7UT6x devices.
Power Supply
The functional units described are supplied by a power supply PS with the necessary power in the different
voltage levels. Transient dips of the supply voltage, which may occur during short-circuit in the power supply
system, are bridged by a capacitor (see also Technical Data).
18 SIPROTEC 4, 7UT6x, Manual
C53000-G1176-C230-5, Edition 09.2016