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LED
PROTECTION LEDS
PROTECTION IN SERVICE
PILOT
Zone1
Zone2
Zone3
AG
BG
CG
φ
M
OTHER
RECLOSING AND SYNCH-CHECK RELATED LEDS
RECLOSING IN SERVICE
LOCKOUT
FAILED RECLOSE
HBDL
HLDB
SYNCHRONISM
4. 4.
FRONT PANEL MAN-MACHINE INTERFACE
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 set-
tings, and for checking relay unit operations after a fault.
It consists of a 2-line 16-character/line LCD display, 4 push-buttons (SELECT, LOW-
ER, RAISE, ENTER) and a switch. The latter selects the display of either the protection
or the optional recloser. It should always be in protection mode when no reclosing in-
formation 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 inter-
face with the REL 301/302 relay menu and settings.
(10/94)
FRONT PANEL LED INDICATOR CHART
Color
Yellow
Red
Red
Red
Red
Red
Red
Red
Red
Red
(
OPTIONAL
Yellow
Yellow
Yellow
Yellow
Yellow
Yellow
Condition
ON– For Normal condition of dc power
Successful self-check
Self-test routines
OFF – Any of the above failed
Pilot Tripped
Zone1 Tripped
Zone2 Tripped
Zone3 Tripped
AG Fault
BG Fault
CG Fault
Multi-phase Fault
Fault Generated by Overcurrent
Load Loss, or
Trip Relays Testing
)
ON – dc power ON
Reclosing Logic in Lockout State
Breaker associated with Recloser failed to reclose
Bus is Live and Line is Dead
Line is Live and Bus is Dead
Bus and Line Voltages in Synchronism
I.L. 40-386.3
4-3
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