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Motors Control

Timers Types & Uses | Dashpot, Synchronous Clock, Solid-State, Solid-State Programmable Timer

The four major categories of timers are dashpot, synchronous clock, solid-state, and solid-state programmable. See Figure 1. Dashpot, synchronous clock and solid-state timers are stand-alone timers. Stand-alone timers are physically connected between the input device (limit switch, etc.) and the output device (solenoid, etc.) controlled by the timer. Solid-state programmable …

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Electric Motor Control Wiring Methods

An electric motor must have a method of control in order to operate safely and efficiently. Motor control circuits vary from simple to complex. Reversing motor control circuits, similar to no reversing motor control circuits, can be wired using manual controls (manual starters, drum switches), magnetic controls (magnetic starters), motor …

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Magnetic Motor Starter Control Circuit

Magnetic motor starters are used to turn motors on and off and provide overload protection. A magnetic motor starter also provides additional control contacts (NO and NC auxiliary contacts) in addition to power contacts (L1/T1, L2/T2, L3/T3) used to switch the motor on and off. Magnetic motor starters work well …

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AC and DC Contactor Working Principle

AC or DC contactors

AC contactor assemblies may have several sets of contacts. DC contactor assemblies typically have only one set of contacts. See Figure 1. In three AC contactors, all three power lines must be broken. This creates the need for several sets of contacts. For multiple contact control, a T-bar assembly allows …

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Manual Motor Starter: Working & Applications

A manual starter is a contactor with an added overload protective device. Manual starters are used only in electrical motor circuits. The primary difference between a manual contactor and a manual starter is the addition of an overload protective device. See Figure 1. Figure 1. A manual starter is a …

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Manual Contactor: Working Principle & Wiring Diagram

A manual contactor is a control device that uses pushbuttons to energize or de-energize the load connected to it. See Figure 1. A manual contactor manually opens and closes contacts in an electrical circuit. Manual Contactor Working Manual contactors cannot be used to start and stop motors because they have …

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Digital Logic Functions | Digital Logic Gates

Control devices such as push buttons, limit switches, and pressure switches are connected into a circuit so that the circuit can function in a predetermined manner. All control circuits are basic logic functions or combinations of logic functions. Logic functions are common to all areas of industry. This includes electricity, …

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Motor Starter Control Circuit Diagram

Figure 2 Three Phase induction motor

The electrical industry has established a universal set of symbols and rules on how line diagrams (circuits) are laid out. By applying these standards, an electrician establishes a working practice with a language in common with all electricians. One Load per Line No more than one load should be placed …

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Types of Electric Motors and their Applications

three phase motor

Although there are many different types and sizes of motors, most electric motors used in commercial and industrial applications can be classified as single-phase (1 φ) or three-phase (3 φ). Single-phase motors are commonly used in some commercial applications such as garage door openers, sump pumps, automatic doors, and ceiling …

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Reversing Three Phase Induction Motors

Reversing Three Phase Induction Motors

Three phase induction Motor rotation can be reversed by changing any two of the three lines feeding power to the motor. It is common standard practice to switch line 1 and line 3. When the motor needs to be run in a clockwise and a counterclockwise rotation, a reverse starter …

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PLC Scan Cycle | PLC Programming Software

As there are many PLC manufacturers, there are as many software programming packages. Each manufacturer developed their own software with no set standards other than it must follow relay ladder logic so that technicians could easily be trained without having to be software engineers. Two terms describe PLC software; open …

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