Getting Started P746/EN GS/G31
(GS) 3-
4
MiCOM P746
GS
Function key functionality:
− The relay front panel features control pushbutton switches with programmable LEDs
that facilitate local control. Factory default settings associate specific relay functions
with these 10 direct-action pushbuttons and LEDs e.g. reset indications. Using
programmable scheme logic, the user can readily change the default direct-action
pushbutton functions and LED indications to fit specific control and operational needs.
− Hotkey functionality: When the functionality is disabled:
− SCROLL
Starts scrolling through the various default displays.
− STOP
Stops scrolling the default display.
When the functionality is disabled:
− For control of setting groups, control inputs and circuit breaker operation
− 22 LEDs; 4 fixed function LEDs, 8 tri-colour programmable function LEDs on the left
hand side of the front panel and 10 tri-colour programmable function LEDs on the right
hand side associated with the function keys
− Under the top hinged cover:
− The relay serial number, and the relay’s current and voltage rating information
− Under the bottom hinged cover:
− Battery compartment to hold the 1/2 AA size battery which is used for memory
back-up for the real time clock, event, fault and disturbance records
− A 9-pin female D-type front port for communication with a PC locally to the relay (up to
15m distance) via an EIA(RS)232 serial data connection
− A 25-pin female D-type port providing internal signal monitoring and high speed local
downloading of software and language text via a parallel data connection
1.2.1.1 LED indications
Fixed Function
The 4 fixed function LEDs on the left-hand side of the front panel are used to indicate the
following conditions:
Trip (Red) indicates that the relay has issued a trip signal. It is reset when the associated
fault record is cleared from the front display.
Alarm (Yellow) flashes to indicate that the relay has registered an alarm. This may be
triggered by a fault, event or maintenance record. The LED will flash until the alarms have
been accepted (read), after which the LED will change to constant illumination, and will
extinguish, when the alarms have been cleared.
Out of service (Yellow) indicates that the relay’s protection is unavailable or a test mode is
selected.
Healthy (Green) indicates that the relay is in correct working order, and should be on at all
times. It will be extinguished if the relay’s self-test facilities indicate that there is an error with
the relay’s hardware or software. The state of the healthy LED is reflected by the watchdog
contact at the back of the relay.
To improve the visibility of the settings via the front panel, the LCD contrast can be adjusted
using the “LCD Contrast” setting in the CONFIGURATION column. This should only be
necessary in very hot or cold ambient temperatures.
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