Schweitzer Engineering Laboratories SEL-421-4 - Front-Panel LCD Default Displays

Date Code 20171021 Instruction Manual SEL-421 Relay
Instruction ManualInstruction Manual
SECTION 4
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 pre-
sented 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 per-
form often-used control actions rapidly by using the large direct-action pushbut-
tons. All of these features help you operate the relay from the front panel and
include:
➤ Reading metering
➤ Inspecting targets
➤ Accessing settings
➤ Controlling relay operations
General front-panel operations are described in the Section 4: Front-Panel Oper-
ations in the SEL-400 Series Relays Instruction Manual. This section provides
additional information that is unique to the SEL-421. This section includes the
following:
➤ Front-Panel LCD Default Displays on page 4.1
➤ Front-Panel Menus and Screens on page 4.3
➤ Target LEDs on page 4.9
➤ Front-Panel Operator Control Pushbuttons on page 4.13
➤ One-Line Diagrams on page 4.15
Front-Panel LCD Default Displays
The SEL-421 has two screen scrolling modes: autoscrolling mode and manual-
scrolling mode. After front-panel time out, the LCD presents each of the display
screens in this sequence:
➤ One-line diagram
➤ Any active (filled) alarm points screens
➤ Any active (filled) display points screens
➤ Enabled metering screens
The relay displays enabled metering screens in the order listed in Table 4.1. (see
Figure 4.4 for samples of the metering screens.) This sequence comprises the
ROTATING DISPLAY.