Schweitzer Engineering Laboratories SEL-749M - Page 5

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Date Code 20080918 Instruction Manual SEL-749M Relay
Table of Contents
Appendix D: Modbus RTU Communications Protocol
Overview ........................................................................................................................................................ D.1
Communications Protocol .............................................................................................................................. D.1
Modbus Register Map .................................................................................................................................. D.11
Appendix E: DeviceNet
Overview .........................................................................................................................................................E.1
DeviceNet Card ...............................................................................................................................................E.1
Features............................................................................................................................................................E.2
Electronic Data Sheet ......................................................................................................................................E.3
Appendix F: Motor Thermal Element
Overview ......................................................................................................................................................... F.1
Purpose of Motor Thermal Protection ............................................................................................................. F.2
The Basic Thermal Element ............................................................................................................................ F.3
Motor Starting Protection ................................................................................................................................ F.6
Motor Running Protection............................................................................................................................... F.7
Interpreting Percent Thermal Capacity Values................................................................................................ F.9
Thermal Element Trip-Time Equations........................................................................................................... F.9
Appendix G: Relay Word Bits
Overview ........................................................................................................................................................ G.1
Definitions ...................................................................................................................................................... G.2
Glossary
Index
SEL-749M Relay Command Summary
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