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Jayrodil Essay

2121 words - 9 pages

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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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 ...view middle of the document...

Electric Motor Controls, G. Rockis, 2001

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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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Electric Motor Controls, G. Rockis, 2001

Contactors
Contactor – a control device that uses a small control current to energize or deenergize 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 electrical devices to be controlled from remote locations.

Electric Motor Controls, G. Rockis, 2001

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Electric Motor Controls, G. Rockis, 2001

Magnetic Motor Starters
A magnetic motor starter is an electrically-operated switch (contactor) that includes motor overload protection. Magnetic motor starters are identical to contactors except that they have overloads attached to them.

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Magnetic Motor Starters
The overloads have heaters or electronic overloads (located in the power circuit) which sense excessive current flow to the motor. The heaters open the NC overload contacts (located in the control circuit) when the overload becomes dangerous to the motor.

Electric Motor Controls, G. Rockis, 2001

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Logic Applied to Line Diagrams
Chapter 4

Material taken from Chapter 4 of Electric Motor Controls, G. Rockis, 2001

Basic Rules
The electrical industry has established a universal set of symbols and rules on how line diagrams (circuits) are laid out.

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One Load Per Line
No more than one load should be placed in any one circuit line between L1 and L2. A pilot light can be connected into a circuit with single-pole switch.

Electric Motor Controls, G. Rockis, 2001

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One Load Per Line
Two loads must not be connected in series on one line of a line diagram. If the two loads are connected in series, then the voltage between L1 and L2 must divide across both loads when S1 is closed. The result is that neither device receives the entire 120 V necessary for proper operation.

One Load Per Line
Loads must be connected in parallel when more than one load must be connected in the line diagram. This circuit has two lines, one for the pilot light and one for the solenoid.

Electric Motor Controls, G. Rockis, 2001

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Load Connections
A load is the electrical device in the line diagram that uses the electrical power from L1 to L2. Control relay coils, solenoids, and pilot lights are loads that are connected...

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