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SEL-749M Relay Instruction Manual Date Code 20080918
Preface
Conventions
Appendix C: SEL Communications Processors. Provides examples of how
to use the SEL-749M with the SEL-2032, SEL-2030, and SEL-2020
Communications Processors for total substation automation solutions.
Appendix D: Modbus RTU Communications Protocol. Describes the
Modbus
®
protocol support provided by the SEL-749M.
Appendix E: DeviceNet. Describes the use of DeviceNet (data-link and
application protocol) over CAN (hardware protocol).
Appendix F: Motor Thermal Element. Contains a fundamental description
of the SEL-749M thermal element. Describes interpretation of percent
thermal capacity and thermal capacity used to start quantities.
Appendix G: Relay Word Bits. Lists and describes the Relay Word bits
(outputs of protection and control elements).
SEL-749M Relay Command Summary. Briefly describes the serial port
commands that are fully described in Section 7: Communications.
Conventions
Typographic
Conventions
There are two ways to communicate with the SEL-749M:
➤ Using a command line interface on a PC terminal emulation
window
➤ Using the front-panel menus and pushbuttons
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-749M. 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-749M.
Typogra phic Conventions
Example Description
STATUS Commands typed at a command line interface on a PC.
<Enter> Single keystroke on a PC keyboard.
<Ctrl+D> Multiple/combination keystroke on a PC keyboard.
Start > Settings PC dialog boxes and menu selections.
The > character indicates submenus.
{CLOSE} Relay front-panel pushbuttons.
ENABLE Relay front- or rear-panel labels.
MAIN > METER
Relay front-panel LCD menus and relay responses.
The > character indicates submenus.
Courtesy of NationalSwitchgear.com
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