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RELAY-BASED CONTROL SYSTEMS
Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.orgCitation: (doi:10.13031/2013.17769) in Relay-Based Control Systems. Chapter 9 in Fundamentals of Electricity for Agriculture, 3rd edition, 249-275. St. Joseph, Michigan: ASAE. . Copyright 2004 American Society of Agricultural and Biological Engineers, St. Joseph, Mich.
Authors: Gustafson, Robert J., and Mark T. Morgan
Keywords: Relay Principles, Time-Delay Relays, Relays vs. Electromagnetic Contactors, Magnetic Motor Starters, Ladder Logic Diagrams, Reduced Voltage Control and Overload Contacts
Previous control system examples only showed switches that directly controlled the load. In this chapter, we will examine relay-based controls that allow larger electrical loads such as motors to be controlled indirectly for improved safety and flexibility. We will start by explaining the construction and function of relays, magnetic contactors, and motor starters, and then cover the common language of relay-based controls known as ladder logic diagrams.