Date Code 20090715 User’s Guide SEL-421 Relay
Section 5
U.User’s Guide
Front-Panel Operations
The SEL-421 Relay front panel makes power system data collection and
system control quick and efficient. Using the front panel, you can analyze
power system operating information, view and change relay settings, and
perform relay control functions. The relay features a straightforward menu-
driven control structure presented on the front-panel liquid crystal display
(LCD). Front-panel targets and other LED indicators give a quick look at
SEL-421 operation status. You can perform often-used control actions rapidly
by using the large direct-action pushbuttons. All of these features help you
operate the relay from the front panel and include:
➤ Reading metering
➤ Inspecting targets
➤ Accessing settings
➤ Controlling relay operations
This section includes the following:
➤ Front-Panel Layout on page U.5.2
➤ Front-Panel Menus and Screens on page U.5.13
➤ Front-Panel Automatic Messages on page U.5.34
➤ Operation and Target LEDs on page U.5.36
➤ Front-Panel Operator Control Pushbuttons on page U.5.40
Courtesy of NationalSwitchgear.com
To Next Page
Loading...
