U.5.15
Date Code 20090715 User’s Guide SEL-421 Relay
Front-Panel Operations
Front-Panel Menus and Screens
If you did not enter a valid password, the relay displays the error screen shown
in Figure 5.15. Entering a valid password for an access level below the
required access level also causes the relay to generate the error screen. In both
password failure cases, the relay does not change the front-panel access level
(it does not reset to Access Level 1 if at a higher access level). The relay
displays the
PASSWORD INVALID screen for five seconds. If you do not want to
wait for the relay to remove the message, press any of the six navigational
pushbuttons during the five-second error message to return to the previous
screen in which you were working.
Figure 5.15 Invalid Password Screen
Main Menu
The MAIN MENU is the starting point for all other front-panel menus. The relay
MAIN MENU is shown in Figure 5.16. When the front-panel LCD is in the
ROTATING DISPLAY, press the {ENT} pushbutton to show the MAIN MENU.
Figure 5.16 MAIN MENU
Meter
The SEL-421 displays metering screens on the LCD. Highlight METER on the
MAIN MENU screen to select these screens. The METER MENU, shown in
Figure 5.17, allows you to choose the following metering screens
corresponding to the relay metering modes:
➤ RMS METER
➤ FUNDAMENTAL METER
➤ DEMAND METER (if enabled)
➤ ENERGY METER
➤ MAX/MIN
➤ SYNCHRONISM CHECK (if enabled)
The Password Entered
Is Not Sufficient for
The Required Access
Level.
Password Invalid
METER
EVENTS
BREAKER MONITOR
RELAY ELEMENTS
LOCAL CONTROL
SET/SHOW
RELAY STATUS
VIEW CONFIGURATION
DISPLAY TEST
RESET ACCESS LEVEL
MAIN MENU
Courtesy of NationalSwitchgear.com
To Next Page
Loading...
