Schweitzer Engineering Laboratories SEL-421-4 - Applications

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Date Code 20171021 Instruction Manual SEL-421 Relay
Preface
General Information
General Information
The SEL-421 Instruction Manual uses certain conventions that identify particular
terms and help you find information. To benefit fully from reading this manual,
take a moment to familiarize yourself with these conventions.
Typographic Conventions
There are three ways users typically communicate with SEL-400 series relays:
➤ Using a command line interface on a PC terminal emulation window,
such as Microsoft HyperTerminal
➤ Using the front-panel menus and pushbuttons
➤ Using ACSELERATOR QuickSet SEL-5030 Software
The instructions in this manual indicate these options with specific font and for-
matting attributes. The following table lists these conventions:
CAUTION
Do not connect power to the relay until you have completed these proce-
dures and receive instruction to apply power. Equipment damage can
result otherwise.
ATTENTION
Ne pas mettre le relais sous tension avant d’avoir complété ces procé-
dures et d’avoir reçu l’instruction de brancher l’alimentation. Des dom-
mages à l’équipement pourraient survenir autrement.
CAUTION
Use of controls or adjustments, or performance of procedures other than
those specified herein, may result in hazardous radiation exposure.
ATTENTION
L’utilisation de commandes ou de réglages, ou l’application de tests de
fonctionnement différents de ceux décrits ci-après peuvent entraîner
l’exposition à des radiations dangereuses.
Other Safety Marks (Sheet 3 of 3)
Example Description
STATUS Commands, command options, and command variables typed at a
command line interface on a PC.
n
SUM n
Variables determined based on an application (in bold if part of a com-
mand).
<Enter> Single keystroke on a PC keyboard.
<Ctrl+D> Multiple/combination keystroke on a PC keyboard.
Start > Settings PC software dialog boxes and menu selections. The > character indi-
cates submenus.
ENABLE Relay front- or rear-panel labels and pushbuttons.
MAIN > METER
Relay front-panel LCD menus and relay responses visible on the PC
screen. The > character indicates submenus.