1-2 Introduction Date Code 20010518
SEL-2020 Instruction Manual
Section Highlights
The following list summarizes the main purpose of each section:
• Section 2: General Description, describes the SEL-2020’s special features and their
benefits to the user.
• Section 3: Installation, includes information and procedures you should be familiar with
to install the SEL-2020 safely and effectively.
• Section 4: “Job Done” Examples, describes SEL-2020 operations and user interface
with nine examples that include a variety of common applications.
• Section 5: Commands, describes the command set that you use to control, monitor,
operate, and set the SEL-2020. This section also includes the rules governing the use of
these commands. A list summarizing the commands appears at the end of this section and
on a blue pull-out card at the back of the book.
• Section 6: Settings, provides detailed information about the commands used to configure
and control the SEL-2020 and explains how you should respond to the SEL-2020 settings
prompts. The SEL-2020 setting sheets are included at the end of Section 6: Settings.
• Section 7: SEL
OGIC
®
Control Equations, covers SELOGIC Control Equation operation,
inputs, syntax, and outputs.
• Section 8: Message Strings, provides information about the characters, and pre-defined
strings that you can use in a number of SEL-2020 settings. At the end of this section and
also on a blue pull-out card at the end of the book is a summary list of special characters
and pre-defined strings.
• Section 9: Database, describes the structure of the SEL-2020 database and the various
ways data within the database can be accessed.
• Section 10: Maintenance, describes the minimal maintenance steps you should follow to
keep the SEL-2020 operating properly. This section also includes a guide to
troubleshooting and alarm diagnosis.
Appendices
The following appendices provide supplemental reference information:
• Appendix A: Firmware Versions
• Appendix B: Optional Internal Modem Information
• Appendix C: LMD Protocol
• Appendix D: ASCII Reference Table
• Appendix E: Planning Sheets
• Appendix F: SEL-2020 Compatibility
• Appendix G: Modbus
®
Protocol
• Appendix H: Configuration and Fast Operate Commands
• Appendix I: Distributed Network Protocol (DNP) V3.00
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