Electrical Symbols and Line Diagrams

Electrical Symbols and Line Diagrams - Electrical Symbols...

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1 Electrical Symbols and Line Diagrams Chapter 3 Material taken from Chapter 3 of Electric Motor Controls, G. Rockis, 2001 One-Line Diagrams ± One-line diagram – a diagram that uses single lines and graphic symbols to indicate the path and components of an electrical circuit. ± One-line diagrams are used when information about a circuit is required but detail of the actual wire connections and operation of the circuit are not.
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2 Line Diagrams ± A line (ladder) diagram is a diagram that shows the logic of an electrical circuit or system using standard symbols. ± A line diagram is used to show the relationship between circuits and their components but not the actual location of the components. ± Line diagrams provide a fast, easy understanding of the connections and use of components. Electric Motor Controls, G. Rockis, 2001
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3 Electric Motor Controls, G. Rockis, 2001 Wiring Diagrams ± Wiring (connection) diagram – a diagram that shows the connection of an installation or its component devices or parts. ± Wiring diagrams show, as closely as possible, the actual location of each component in a circuit, including the control circuit and the power circuit.
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4 Electric Motor Controls, G. Rockis, 2001 Manual Control Circuits ± Manual control circuit – any circuit that requires a person to initiate an action for the circuit to operate. ± A line diagram may be used to illustrate a manual control circuit of a pushbutton controlling a pilot light. ± A line diagram may be used to illustrate the control and protection of a 1 ϕ motor using a manual starter with overload protection.
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5 Electric Motor Controls, G. Rockis, 2001 Electric Motor Controls, G. Rockis, 2001
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6 Automatic Control Circuits ± Automatically-controlled devices have replaced many jobs that were once performed manually. ± As a part of automation, control circuits are designed to replace manual devices. Electric Motor Controls, G. Rockis, 2001
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7 Magnetic Control Circuits ± Although manual controls are compact and sometimes less expensive than magnetic controls, industrial and commercial installations often require that electrical control equipment be located in one area while the load device is located in another. ± Solenoids, contactors, and magnetic motor starters are used for remote control of devices. Solenoids ± A solenoid is an electrical device that converts electrical energy into a linear mechanical force. Electric Motor Controls, G. Rockis, 2001
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8 Electric Motor Controls, G. Rockis, 2001 Contactors ± Contactor – a control device that uses a small control current to energize or de- energize the load connected to it. ± A contactor does not include overload protection. ± A contactor has a frame, plunger, and coil like a solenoid.
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Contactors ± The action of the plunger, however, is directed to close (or open) sets of contacts. ± The closing of the contacts allows
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Electrical Symbols and Line Diagrams - Electrical Symbols...

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