4.34
SEL-400 Series Relays Instruction Manual Date Code 20171006
Front-Panel Operations
Front-Panel Operator Control Pushbuttons
Operational
The ENABLED LED indicates that the relay is active. Trip events illuminate the TRIP
LED. The prominent location of the TRIP LED in the top target area helps you
recognize a trip event quickly. Program settings EN_LEDC and TR_LEDC to
determine the color of the respective LED. Options include red or green.
TARGET RESET and Lamp Test
For a trip event, the relay latches the trip-involved target LEDs. Press the TARGET
RESET pushbutton to reset the latched target LEDs. When a new trip event occurs
and you have not reset the previously latched trip targets, the relay clears the
latched targets and displays the new trip targets.
Pressing the TARGET RESET pushbutton illuminates all the LEDs. Upon releasing
the TARGET RESET pushbutton, two possible trip situations can exist: the conditions
that caused the relay to trip have cleared, or the trip conditions remain present at
the relay inputs. If the trip conditions have cleared, the latched target LEDs turn
off. If the trip event conditions remain, the relay re-illuminates the corresponding
target LEDs. The TARGET RESET pushbutton also removes the trip automatic mes-
sage displayed on the LCD menu screens if the trip conditions have cleared.
Lamp Test Function With TARGET RESET
The TARGET RESET pushbutton also provides a front-panel lamp test. Pressing TAR-
GET RESET illuminates all the front-panel LEDs, and these LEDs remain illumi-
nated for as long as you press TARGET RESET. The target LEDs return to a normal
operational state after you release the TARGET RESET pushbutton.
Other Target Reset Options
You can reset the target LEDs with the ASCII command TAR R; see TARGET on
page 14.53 for more information.
The TAR R command and the TARGET RESET pushbutton also control the TRGTR
Relay Word bit, which can be used for other functions. TRGTR is the factory-
default setting for the unlatch trip SEL
OGIC control equation, ULTR, in group
settings.
You can reset the targets from the QuickSet Control branch of the HMI tree
view. Programming specific conditions in the SEL
OGIC control equation RST-
TRGT is another method to reset the relay targets. Access RSTTRGT in the relay
Global settings (Data Reset Control); to use RSTTRGT, you must enable data
reset control with Global setting EDRSTC := Y.
Front-Panel Operator Control Pushbuttons
The relay front panel features large operator control pushbuttons coupled with
amber annunciator LEDs for local control. Figure 4.41 shows this region of the
relay front panel with example factory-default configurable front-panel label text.
SEL-400 series relays provide either 8 or 12 pushbuttons depending on the prod-
uct and ordering option.
To Next Page
Loading...
