ABB REL300 Instruction Manual page 101

I.L. 40-385.7
• Function Raise
• Function Lower
• Value Raise
• Value Lower
• Enter (recessed for security purposes)
The "Display Select" pushbutton is used to select one of the five display modes, which is indi-
cated when the proper LED illuminates. When a fault is detected, the "Last Fault" flashes once
per second. If two faults are recorded, the "Last Fault" flashes twice per second, and the prior
fault will be moved from "Last Fault" to "Previous Fault". The new fault data will be stored in the
"Last Fault" register. By depressing the "Reset Targets" pushbutton, the flashing LED indicators
are cleared, and the LED will revert back to the Metering mode. The information in the "Previ-
ous Fault" and "Last Fault" will not be reset from the front panel pushbutton switch, but will be
reset from External Reset (TB5/5 and TB5/6) and the remote reset through the Communication
Interface.
The "Function Raise" and "Function Lower" pushbuttons are used to scroll through the informa-
tion for the selected display mode. The "Value Raise" and "Value Lower" pushbuttons are used
to scroll through the different values available for each of the five functions. The "Enter" push-
button is used to enter (in memory) a new value for settings.
If the display is in "sleep" mode (no readout), by depressing any one of the pushbuttons will
resume the illumination of the vacuum fluorescent display.
4.4.4 Test Points
Five test points -24V, + 5V, -12V, +12 Volts and common are removed from the front panel for
this REL300 version.
4.5 FRONT PANEL OPERATION
The front (operator) panel provides a convenient means of checking or changing settings, and
for checking relay unit operations after a fault. Information on fault location, trip types, phase,
operating units, and breakers which tripped become available by using the pushbuttons to step
through the information. Targets (fault data) from the last two faults are retained, even if the
relay is deenergized. The operator is notified that targets are available by a red flashing LED
on the front panel; in addition, alarm 2 output-relay contacts are provided for the external an-
nunciators.
The operator can identify nonfault voltage, current and phase angle on the front panel display.
Settings can be checked easily, however, any change to the settings requires the use of the
pushbuttons. When relay is in the normal operating mode, it is good practice to set the LED on
the Volts/Amps/Angle mode.
4.5.1 Settings Mode
In order to determine the REL300 settings that have been entered into the system, continually
depress the "DISPLAY SELECT" pushbutton until the "SETTINGS" LED is illuminated. Then
depress the "FUNCTION RAISE" or "FUNCTION LOWER" pushbutton, in order to scroll
through the REL300 SETTINGS functions (see Table 4-1, page 4-16). For each settings func-
tion displayed, depress the "VALUE RAISE" or "VALUE LOWER" pushbutton in order to scroll
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