4.14
SEL-421 Relay Instruction Manual Date Code 20171021
Front-Panel Operations
Front-Panel Operator Control Pushbuttons
Press the operator control pushbuttons momentarily to toggle on and off the func-
tions listed adjacent to each LED/pushbutton combination. The CLOSE and TRIP
pushbuttons momentarily assert the close and trip relay outputs after a short
delay.
The operator control pushbuttons and LEDs are programmable. Figure 4.11
describes the factory defaults for the operator controls.
There are two ways to program the operator control pushbuttons. The first is
through front-panel settings PBn_HMI. These settings allow any of the operator
control pushbuttons to be programmed to display a particular HMI screen cate-
gory. The HMI screen categories available are Alarm Points, Display Points, and
Event Summaries, and SER. Front-panel setting NUM_ER allows the user to
define the number of event summaries that are displayed via the operator control
pushbutton; it has no effect on the event summaries automatically displayed or
the event summaries available through the main menu. Each HMI screen cate-
gory can be assigned to a single pushbutton. Attempting to program more than
one pushbutton to a single HMI screen category will result in an error. After
assigning a pushbutton to an HMI screen category, pressing the pushbutton will
jump to the first available HMI screen in that particular category. If more than
one screen is available, a navigation scroll bar will be displayed. Pressing the
navigation arrows will scroll through the available screens. Subsequent pressing
of the operator control pushbutton will advance through the available screens,
behaving the same as the Right Arrow or the Down Arrow pushbutton. Pressing the
ESC pushbutton will return the user to the
ROTATING DISPLAY. The second way to
program the operator control pushbutton is through SEL
OGIC control equations,
using the pushbutton output as a programming element.
Using SEL
OGIC control equations, you can readily change the default LED func-
tions. Use the slide-in labels to mark the pushbuttons and pushbutton LEDs with
custom names to reflect any programming changes that you make. The labels are
keyed; you can insert each Operator Control Label in only one position on the
front of the relay. Included on the SEL-421 Relay Product Literature CD are
word processor templates for printing slide-in labels. See the instructions
included in the Configurable Label kit for more information on changing the
slide-in labels.
The SEL-421 has two types of outputs for each of the front-panel pushbuttons.
Relay Word bits represent the pushbutton presses. One set of Relay Word bits fol-
lows the pushbutton and another set pulses for one processing interval when the
button is pressed. Relay Word bits PB1 through PB12 are the “follow” outputs of
operator control pushbuttons. Relay Word bits PB1_PUL through PB12PUL are
the pulsed outputs.
Annunciator LEDs for each operator control pushbutton are PB1_LED through
PB12LED. The factory defaults programmed for these LEDs are protection
latches (PLT01, for example), settings groups, Relay Word bits (NOT SG1), and
the status of the circuit breaker auxiliary contacts (52AA1). The asserted and
deasserted colors for the LED are determined with settings PBnCOL. Options
include red, green, amber, or off.
You can change the LED indications to fit your specific control and operational
requirements. This programmability allows great flexibility and provides opera-
tor confidence and safety, especially in indicating the status of functions that are
controlled both locally and remotely.
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