Advertisement
4.4 General Alarm Screens
The Argus 8 relay has an independent display function that provides up to nine General Alarm screens, each of
which may be programmed by the user to display a message associated with an external alarm.
Within the System Config Menu, each alarm message can be text edited by the user to display up to 13
characters. Also, each alarm can be user mapped to any status input, via the Status Config Menu, so that on
energisation of that input the associated alarm message is automatically displayed. Where more than one
General Alarm is raised then the display will scroll right to left to show all energised screens sequentially, with
screens separated by a '+' sign. If required, more than one alarm may be mapped to a single status input,
allowing long messages to be displayed.
The message will appear on the LCD for the duration of the time that the status input is energised.
4.5 Default Instrument Screens
The menu presentation of the various instruments allows the user to view a single screen at a time. However, for
in-service use, it is desirable that a small number of high interest, user selectable, screens are presented
automatically by default without user intervention. The instrument screens of interest to the user e.g. those
required to be presented to a visiting engineer for record purposes can be selected by the user by pressing
ENTER when viewing the required screen. On pressing ENTER a 'Screen Set As Default' message will be
flashed up and a ' ' will appear at the top right of that screen. The ' ' indicates that a screen is a 'default screen'.
To de-select a default screen, simply press ENTER while on that particular screen and a 'Screen Cleared As
Default' message will be flashed up. The ' ' symbol will be cleared.
If no keys have been pressed for a pre-determined time the relay will jump to the default instrument display
regardless of where the menu system has been left by the user. It will then scroll through each of the selected
default instruments and remain on each for 5 seconds. The main timer, which sets the time to elapse before the
relay goes into the default instruments mode is found in the System Config Menu. This is the Default Screen
Timer setting and it can be set to a range of values from 10 seconds to 1 hour. See relay settings, Section 3 of
this manual.
If any General Alarm is raised, then the general alarm screen will be presented in the default screen sequence.
The general alarm screen, which has a scrolling display, will present one pass of its display message.
Any key press while in the default screen sequence will result in a return to the 'Relay Identifier' screen at the top
of the menu structure.
4.6 Multiple Settings Groups.
Argus relays provide eight alternative setting groups, making it possible to edit one group while the relay
protection algorithms operate using another 'active' group. An indication of which group is being viewed is given
by the 'Gn' character in the top left of the display. The relay can then be switched from one group of settings to
another to suit alterations in the power system configuration. Changeover will occur within 25ms.
A change of group can be achieved either locally at the relay fascia, remotely via a communication interface
command or by energisation of a status input. In the case of the latter method, the 'Settings Group Select' setting
is used to configure any one (or more) of the status inputs to select a settings group. The selected group is then
made active if the status input is energised and remains active for as long as the input remains energised.
4.7 Password Feature
The programmable password feature enables the user to enter a 4 character alphanumeric code to secure access
to the relay settings. The relay is supplied with the password set to 'NONE' which means that the password
feature is not activated. Once a password has been entered then it will be required thereafter to change settings.
It can, however, be de-activated by using the password to gain access and by resetting it back to 'NONE'.
As soon as the user attempts to change a setting the password is requested before any setting alterations are
allowed. Once the password has been validated, the user is 'logged on' and any further changes can be made
without re-entering the password. If no more changes are made within 1 hour then the user will automatically be
'logged off', re-enabling the password feature.
©2010 Siemens Protection Devices Limited
General Alarms
<< Alarm1 + Al<<
Frequency
50.003Hz
7SG11 Argus 8 Description of Operation
Chapter 1 Page 13 of 20
Advertisement
Chapters
