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1、ENGINEERING MANUAL OF AUTOMATIC CONTROLELECTRIC CONTROL FUNDAMENTALS1CONTENTSElectric Control Fundamentals Introduction.2Definitions.2How Electric Control Circuits are Classified.4SERIES 40 Control Circuits.5 Application.5 Equipment .5 Operation .6 Control Combinations.6SERIES 80 Control Circuits.7
2、Application.7 Equipment .7 Operation .7 Control Combinations.8SERIES 60 Two-Position Control Circuits.8 Application.8 Equipment .8 Operation .9 Control Combinations.11SERIES 60 Floating Control Circuits.11 Application.11 Equipment .11 Operation .11 Control Combinations.11SERIES 90 Control Circuits.1
3、2 Application.12 Equipment .12 Operation .13 Control Combinations.16Motor Control Circuits.19 Application.19 Equipment .19 Operation .20 Control Combinations.21ENGINEERING MANUAL OF AUTOMATIC CONTROLENGINEERING MANUAL OF AUTOMATIC CONTROLELECTRIC CONTROL FUNDAMENTALS2INTRODUCTIONThis section provide
4、s information on electric control circuits used in heating, ventilating, and air conditioning systems. Electric energy is commonly used to transmit the measurement of a change in a controlled condition from a controller to other parts of a system and to translate the change into work at the final co
5、ntrol element. For these purposes, electricity offers the following advantages: It is available wherever power lines can be run. The wiring is usually simple and easy to install. The signals received from sensing elements can be used to produce one or a combination of electro-mechanical outputs. For example, several actuators can be controlled from one controller. Si
