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7UT51 v3
14
Operation Using the Front Panel Controls
This chapter describes how to operate the relay using
the front panel controls. The relay can also be
operated remotely by connecting the relay to a PC
running WinDIGSI software provided by Siemens (see
Chapter 15).
Operating the relay and configuring its settings is done
by viewing and changing values stored in memory
locations, each of which is identified by a four-digit
address.
The addresses are grouped into Address blocks. All of
the addresses in a block have the same first two digits
(e.g., 1000, 1100, 7800).
Some addresses contain numeric values, while others
contain a selection from a menu of options. A few
addresses contain two-level menus, in which each
top-level menu choice contains a selection from a
sub-menu.
The relay can be in one of two modes. Display mode
(the normal mode) enables you to view existing
settings, as well as data acquired by the relay.
Password mode enables you to change settings and
clear stored data. The relay remains in-service while in
either mode. However, changing some settings will
cause the relay's microprocessor to reset,
momentarily removing the relay from service.
14.1
Front Panel
Components
Before configuring and operating the relay, you need
to be familiar with the integral keypad and other
features of the front panel. Figure 14.1 and Figure
14.2 illustrate the features of the front panel for the
7UT512 and 7UT513 relay models, respectively.
14.1.1
Display
The two-line by sixteen-character liquid crystal display
(LCD) allows the viewing of settings, measured data,
fault logs, and the event log. One message can be
displayed during normal operation, while another is
displayed after a fault. Each message is displayed
until superseded by another pickup, a trip message, a
target reset, or a request by the operator to display
other information.
PRIM-2330C
Operation Using the Front Panel Controls
The LCD is not capable of displaying subscript
characters. As a result, lowercase characters are used
for the subscripts in the display. For example, I
becomes In. In this manual, most of the specific
references to the LCD text show the symbols as they
appear in the display. Otherwise, symbols with correct
case and subscripts are used.
14.1.2
Keypad
The keys on the front panel keypad have four basic
functions: data entry, navigation, control, and
confirmation. The numeric keys are used specifically
for data entry or Address selection. The navigation,
control, and confirmation keys are described in Figure
14.3.
The keypad has 28 keys with numbers, Yes and No
and control functions.
Three of the keys, somewhat separated from the rest
of the keys, can be accessed when the front cover is
closed. The arrow keys enable incrementing in the
forward direction. Thus all setting values and event
data can be displayed with the front cover closed.
Stored LED indications on the front can be erased via
the RESET key without opening the front cover.
During reset operation all LEDs on the front will be
illuminated thus performing a LED test. Also, with this
reset, the fault event indications in the display on the
front panel of the device are acknowledged; the
display then shows the operational values of the
quiescent state. The display is switched over to
operating mode as soon as one of the keys is pressed.
14.1.3
On/Off Switch
The On/Off switch controls the operational state of the
relay. When the switch is in the "Off" position, the
microprocessor is reset and processing stops.
Secondary (DC) power output from the power supply
module is switched off, so the relay is effectively
disabled or blocked in this state. This switch should
stay in the On position after the relay has been
properly installed, programmed, and commissioned.
The relay is switched off for certain maintenance and
testing procedures.
14
N
137
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