Front Panel Man-Machine Interface (Mmi); Led Indicators; Leds And Display Reset; Display Module - ABB REL 301 Instruction Leaflet

LED
PROTECTION LEDS
PROTECTION IN SERVICE
PILOT
ZONE-1
ZONE-2
ZONE-3
AG
BG
CG
f
M
OTHER
RECLOSING AND SYNCH-
CHECK RELATED LEDS
RECLOSING IN SERVICE
LOCKOUT
FAILED RECLOSE
HBDL
HLDB
SYNCHRONISM
4. 4.

FRONT PANEL MAN-MACHINE INTERFACE (MMI)

4.4.1

LED Indicators

The REL 301/302 comes with LEDs on the front panel. "IN SERVICE" LED should be on, all
other indicators are off in normal conditions, but after a trip, the ones related to the trip blink. If
a second trip occurs, the LEDs related to the latest fault double blink. See Section 5.1.1 for more
details.
4.4.1.1

LEDs and Display Reset

The push-button labelled RESET is used to reset all the trip LEDs and send the display to the
metering mode.
4.4.2

Display Module

The front panel operation provides a convenient means of checking and changing settings, and
for checking relay unit operations after a fault.
It consists of a 2-line 16-character/line LCD display, 4 push-buttons (SELECT, LOWER, RAISE,
ENTER) and a switch. The latter selects the display of either the protection or the optional re-
closer. It should always be in protection mode when no reclosing information is being viewed or
during re-initialization.
The front panel has different modes of operation, shown at the top right of the display. The 4
push-buttons labeled SELECT, LOWER, RAISE, and ENTER, are used to interface with the
REL 301/302 relay menu and settings.
FRONT PANEL LED INDICATOR CHART
Color
Yellow ON– For Normal condition of dc power
OFF – Any of the above failed
Red Pilot Tripped
Red Zone 1 Tripped
Red Zone 2 Tripped
Red Zone 3 Tripped
Red AG Fault
Red BG Fault
Red CG Fault
Red Multi-phase Fault
Red Fault Generated by Overcurrent
Load Loss, or
Trip Relays Testing
Yellow ON – dc power ON
Yellow Reclosing Logic in Lockout State
Yellow Breaker associated with Recloser failed to reclose
Yellow Bus is Live and Line is Dead
Yellow Line is Live and Bus is Dead
Yellow Bus and Line Voltages in Synchronism
Condition
Successful self-check
Self-test routines
( )
OPTIONAL
I.L. 40-386.4
4-3