U.5.14
SEL-421 Relay User’s Guide Date Code 20090715
Front-Panel Operations
Front-Panel Menus and Screens
Contrast
You can adjust the LCD screen contrast to suit your viewing angle and
lighting conditions. To change screen contrast, press and hold the {ESC}
pushbutton for one second. The relay displays a contrast adjustment box
superimposed over the display.
Figure 5.13 shows the contrast adjustment box with the
MAIN MENU screen in
the background. Pressing the {Right Arrow} pushbutton increases the contrast.
Pressing the {Left Arrow} pushbutton decreases the screen contrast. When
finished adjusting the screen contrast, press the {ENT} pushbutton.
Figure 5.13 Contrast Adjustment
Password
The SEL-421 uses passwords to control access to settings and control menus.
The relay has six access-level passwords. See Changing the Default
Passwords on page U.4.6 for more information on access levels and setting
passwords. The SEL-421 front panel is at Access Level 1 upon initial power-
up and after front-panel time out.
Password validation occurs only when you request a menu function that is at a
higher access level than the presently authorized level. At this point, the relay
displays a password entry screen, shown in Figure 5.14. This screen has a
blank password field and an area containing alphabetic, numeric, and special
password characters with a movable highlight box.
Figure 5.14 Enter Password Screen
Enter the password by pressing the navigation pushbuttons to move the
highlight box through the alphanumeric field. When at the desired character,
press {ENT}. The relay enters the selected character in the password field and
moves the dark box cursor one space to the right. You can backspace at any
time by highlighting the
BACKSPACE character and then pressing {ENT}. When
finished, enter the password by highlighting the
ACCEPT option and then
pressing {ENT}.
If you entered a valid password for an access level greater than or equal to the
required access level, the relay authorizes front-panel access to the
combination of access levels (new level and all lower levels) for which the
password is valid. The relay replaces the password screen with the menu
screen that was active before the password validation routine. When you enter
Access Levels B, P, A, O, and 2, the Relay Word bit SALARM pulses for one
second.
METER
EVENTS
BREAKER MONITOR
RELAY ELEMENTS
LOCAL CONTROL
SET/SHOW
RELAY STATUS
VIEW CONFIGURATION
DISPLAY TEST
RESET ACCESS LEVEL
MAIN MENU
Adjust Contrast
Press when done
This device is shipped with default
passwords. Default passwords should
be changed to private passwords at
installation. Failure to change each
default password to a private
password may allow unauthorized
access. SEL shall not be responsible
for any damage resulting from
unauthorized access.
!
WARNING
A B C D E F G H
I J K L M N O P
Q R S T U V W X
Y Z a b c d e f
g h i j k l m n
o p q r s t u v
w x y z 0 1 2 3
4 5 6 7 8 9
_
.
ACCEPT BACKSPACE
Password Required
Password
Field
Courtesy of NationalSwitchgear.com
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