Alstom MiCOM P54 Series, Technical Manual, Page: 62 / 1024

P54x/EN GS/La4 Getting Started
(GS) 3-4 MiCOM P543, P544, P545 & P546
GS

Hotkey functionality:
 SCROLL Starts scrolling through the various default displays.
 STOP Stops scrolling the default display.
 For control of setting groups, control inputs and circuit breaker operation

22 LEDs; 4 fixed function LEDs, 8 tri-color programmable function LEDs on the left hand
side of the front panel and 10 tri-color 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
1.2.2 LED indications
Fixed Function
The four 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. (Alternatively the trip LED can
be configured to be self-resetting)*.

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.

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 adjust the LCD contrast, from the
CONFIGURATION
column, select
LCD Contrast
. This
is only needed in very hot or cold ambient temperatures.
Programmable LEDs
All the programmable LEDs are tri-color and can be programmed to indicate RED, YELLOW
or GREEN depending on the requirements. The 8 programmable LEDs on the left are
suitable for programming alarm indications and the default indications and functions are
indicated in the table below. The 10 programmable LEDs physically associated with the
function keys, are used to indicate the status of the associated pushbutton’s function and the
default indications are shown below: