xxxiv
SEL-421 Relay Date Code 20090715
Preface
Conventions
Conventions
Typographic
Conventions
There are three ways to communicate with the SEL-421:
➤ Using a command line interface in a PC terminal emulation
window.
➤ 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
formatting attributes. The following table lists these conventions:
Examples
This instruction manual uses several example illustrations and instructions to
explain how to effectively operate the SEL-421. These examples are for
demonstration purposes only; the firmware identification information or
settings values included in these examples may not necessarily match those in
the current version of your SEL-421.
Notes
Margin notes serve two purposes in the SEL-421 Relay Manual. Notes present
valuable or important points about relay features or functions. Use these notes
as tips to easier and more efficient operation of the relay. Also in this manual,
notes specify differences between the SEL-421-0, SEL-421-1, SEL-421-2,
and SEL-421-3 models when these differences affect relay functions or
operations.
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
command).
<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 indicates submenus.
{CLOSE} Relay front-panel pushbuttons.
ENABLE
Relay front- or rear-panel labels.
RELAY RESPONSE
MAIN > METER
Relay front-panel LCD menus and relay responses visible on
the PC screen.
The > character indicates submenus.
U.3.1
A.3.1
R.3.1
Page numbers include a reference to the volume, section, and
page number.
U stands for User’s Guide
A stands for Applications Handbook
R stands for Reference Manual.
SEL
OGIC control
equations
SEL trademarks and registered trademarks contain the appropri-
ate symbol on first reference in a section. In the SEL-421 Instruc-
tion Manual, certain SEL trademarks appear in small caps. These
include SEL
OGIC control equations, MIRRORED BITS communi-
cations, and the
ACSELERATOR
QuickSet software program.
Modbus
Registered trademarks of other companies include the registered
trademark symbol with the first occurrence of the term in a sec-
tion.
Courtesy of NationalSwitchgear.com
To Next Page
Loading...
