ABB REL300 Instruction Manual page 100

4.4 REL300 FRONT PANEL DISPLAY
The front panel display consists of a vacuum fluorescent display, seven LED indicators, seven
pushbutton switches, and five test points (as shown in Figure 1-1, page 1-9 ).
4.4.1 Vacuum Fluorescent Display
The vacuum fluorescent display (blue color) contains four alphanumeric characters for both the
function field and the value field. All the letters or numbers are fourteen segment form (7.88mm
x 13mm in size).
A software display saver is built in. The REL300 display will be on only for 5 minutes after turn-
ing on the dc power supply or depressing any one of the front panel pushbuttons or detecting
any fault on the line.
4.4.2 LED Indicators
There are seven LED indicators on the front panel display:
• 1 "relay-in-service" indicator
• 1 "value accepted" indicator
• 5 display-select indicators
When the "Relay-in-Service" LED illuminates, the REL300 Relay is in service, there is dc power
to the relay and the relay has passed the self-check and self-test. The LED is turned "OFF" if
the Relay-in-service relay has at least one of the internal failures shown in the "Test" mode, and
the trip will be blocked.
The "Value Accepted" LED flashes only once, to indicate that a value has been entered suc-
cessfully.
The five indicators used for the display selection are:
• Settings
• Volts/Amps/Angle
• Last Fault
• Previous Fault
• Test
One of these indicators is always illuminated, indicating the mode selected. The display will be
blocked momentarily every minute for the purpose of self-check; this will not affect the relay
protection function.
4.4.3 Pushbutton Switches
The front panel contains seven pushbutton switches:
• Display Select
• Reset Targets
I.L. 40-385.7
4-3