U.4.53
Date Code 20020501 User’s Guide SEL-421/SEL-421-1 Relay
Basic Relay Operations
Operating the Relay Inputs and Outputs
You can also pulse an output for longer than the default 1-second period. If
you enter a number after the PULSE command, that number specifies the
duration in seconds for the pulse. For example, if you enter PULSE OUT104
3<Enter>, the relay pulses OUT104 for 3 seconds.
Pulsing a Control Output: Front Panel
The procedure in the following steps shows you how to use the front-panel
display and navigation pushbuttons to check for proper operation of the
SEL-421 Relay control outputs. See Section 5: Front-Panel Operations in the
User’s Guide for information on using the relay front panel.
Step 1. Connect an output monitor. Attach an indicating device (an
ohmmeter with a beep sounder or a test set) to the terminals for
control output OUT104. This output is a Standard control
output and is not polarity sensitive. For more information on
connecting control outputs, see Control Outputs on page U.2.6
in the User’s Guide.
Step 2. View the front-panel display. After applying power to the relay,
note that the LCD shows a sequence of screens called the
ROTATING DISPLAY. (Also, if you do not operate the front
panel for a certain period, the relay will enter front-panel time-
out mode and you will see the sequential screens of the
ROTATING DISPLAY.)
Step 3. View the MAIN MENU. Press the {ENT} pushbutton to cause
the relay to display a MAIN MENU similar to that at the top of
Figure 4.48.
Figure 4.48 Front-Panel Menus for Pulsing OUT104.
OUT101
OUT102
OUT103
OUT104
OUT105
OUT106
OUT107
OUT108
PULSE OUTPUT?
OUTPUT TESTING
NO YES
METER
EVENTS
BREAKER MONITOR
RELAY ELEMENTS
LOCAL CONTROL
SET/SHOW
RELAY STATUS
VIEW CONFIGURATION
DISPLAY TEST
RESET ACCESS LEVEL
MAIN MENU
LOCAL CONTROL
--BREAKER CONTROL--
5 MVA XFMR Fans
--OUTPUT TESTING--
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