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Motor Controls
Prepared by Sir. Rene A. Sy Amg Skilled Hands Technological Technological Col. Magdalena Campus.
Magnetic Contactor
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Magnetic Contactor
used to control the operation of an electric current a large relay usually, usually, used to switch current to an electric current motor or other high power load a device uses small control current to energize or de-energize a load. It can handle high amounts of current and also combined w overload relays to create motor starters
electrically controlled switch used for switching a power circuit, similar to relay r elay except with higher 12/23/2012 amperage ratings. 3
Motor controls contains Control Circuit
A circuit contains the control device that will initiate starting or stopping the motor, motor, by the means of the start/stop push button.
Control circuit provides a temporary path for energizing he coil and permanent path through the contact
Delays energization of the coil preselected time to allow switch contact bounce to cease.
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Prevents a reestablishment of the temporary path for preselected time after the contact close
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Power circuit
supplies the line side of main terminal of the contactor
Power circuit carries the motor load current
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Control circuit composed of 1. Overload Overload relay relay or over load load 2. Magnetic Magnetic contactor/Main contactor/Main terminal terminal 3. Transformer ransformer 4. Start stop station station
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Symbols
Start switch is normally Close, while the stop is normally close
Magnetic contactor coil or holding coil 12/23/2012
