Date Code 20080918 Instruction Manual SEL-749M Relay
Preface
R.Ins truction Manual
Manual Overview
The SEL-749M Relay Instruction Manual describes common aspects of motor
relay application and use. It includes the necessary information to install, set,
test, and operate the relay.
An overview of each manual section and topics follows:
Preface. Describes the manual organization and conventions used to
present information.
Section 1: Introduction and Specifications. Describes the basic features
and functions of the SEL-749M; lists the relay specifications.
Section 2: Installation. Describes how to mount and wire the SEL-749M;
illustrates wiring connections for various applications.
Section 3: PC Software. Describes the features, installation methods, and
types of available help available with the
ACSELERATOR QuickSet
®
SEL-5030 software.
Section 4: Protection and Logic Functions. Describes the operating
characteristic of each protection element, using logic diagrams and
text, and explains how to calculate element settings; describes contact
output logic.
Section 5: Metering and Monitoring. Describes the operation of each
metering function; describes the monitoring functions.
Section 6: Settings. Describes how to enter and record settings for basic
motor protection, voltage-based protection, and RTD-based protection.
Section 7: Communications. Describes how to connect the SEL-749M to a
PC for communication; shows serial port pinouts; lists and defines
serial port commands. Describes the optional communications card
that provides DeviceNet™ protocol.
Section 8: Front-Panel Operations. Explains the features and use of the
front panel, including front-panel command menu, default displays,
and automatic messages.
Section 9: Analyzing Events. Describes front-panel LED operation, trip-
type front-panel messages, event summary data, standard event
reports, and Sequential Events Recorder (SER) report.
Section 10: Testing and Troubleshooting. Describes protection element
test procedures, relay self-test, and relay troubleshooting.
Appendix A: Firmware and Manual Versions. Lists the current relay
firmware version and details differences between the current and
previous versions. Provides a record of changes made to the manual
since the initial release.
Appendix B: Firmware Upgrade Instructions. Describes the procedure to
update the firmware stored in flash memory.
Courtesy of NationalSwitchgear.com
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