7SG11 Argus 8 Description of Operation
Note that the password validation screen also displays a numerical code. If the password is lost or forgotten, this
code can be communicated to Reyrolle Protection by authorised personnel, and the password can be retrieved.
4.8 Trip Circuit Supervision
A trip circuit supervision feature is provided within the relay. The Argus 8 can monitor its own trip circuit by
configuring one of its status inputs using the ‘Trip Circuit Fail’ setting and connecting the status input into the trip
circuit. Indication is then given instantaneously of ‘Trip Circuit Fail’ should a fault be detected and this display also
identifies which input has detected the fault. Since the status inputs can be programmed to operate output
contacts, an alarm can be also generated from the trip circuit supervision feature.
See Section 5 - Applications Guide, subsection 2.6 for more details on the trip circuit supervision scheme.
5 User
Interface
The user interface is designed to provide a user-friendly method of entering settings and retrieving data from the
relay. The relay fascia includes a 16 character by 2 line, backlit, liquid crystal display (LCD), 3 light emitting
diodes (LED) and 5 push buttons.
5.1 Liquid Crystal Display
The liquid crystal display is used to present settings, instrumentation and fault data in a textual format. To
conserve power the display backlighting is turned off if no push buttons are pressed for 5 minutes. After one hour
the whole display is de-activated except if the display is left in the ‘Instruments Mode’ where it remain visible
permanently so that instruments can be displayed continuously. Also, if any default instruments have been
selected then the display will not power down, only the backlight will turn off. Once the backlight is turned off, any
following key press will turn the backlight on without changing the display.
5.2 LED
Indications
The following indications are provided :
•
Protection Healthy – Green LED (flashes with fault).
This LED is solidly illuminated to indicate that DC volts have been applied to the relay and that the relay is
operating correctly. If the internal relay watchdog detects a permanent fault then this LED will continuously flash.
•
Starter – Yellow LED (self resetting).
This LED indicates that any of the protection element starters are operating.
•
Trip – Red LED (latched).
This LED indicates that a trip as defined by the user has occurred. Such a trip may be issued by any of the relay’s
protection functions.
5.3 Keypad
Five pushbuttons are used to control the functions of the relay. They are labeled
ENTER
and
CANCEL
.
Note that the button is also labeled
TEST/RESET
.
When the relay front cover is in place only the and buttons are accessible. This allows only read access to all
the menu displays. It is not possible to change settings.
5.4 Navigating the Menu System
The display menu structure is shown in Figure 5. This diagram shows the three main modes of display, which are
the Settings Mode, Instruments Mode and the Fault Data Mode.
On relay start up the user is presented with a default relay identifier,
ARGUS 8
Factory Settings
which shows that the relay has been set with the standard factory default settings. The top line of the LCD can be
changed to some user-definable identifier or code if preferred.
©2010 Siemens Protection Devices Limited
Chapter 1 Page 14 of 20
