Transcription of Electric Motor Controls - Process Control and …
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Electric Motor Controls - Process Control and …
1 Electric Motor CONTROLSOnce the proper Motor is selected, understanding the many various Control devices available andtheir uses and limitations becomes an important part related to reliable operation and protection ofthe Motor and the personnel using the Control TopicsThere are four major Motor Control topics or categories to consider. Each of these has severalsubcategories and sometimes the subcategories overlap to some extent. Certain pieces of motorcontrol equipment can accomplish multiple functions from each of the topics or four categories include:1) Starting the MotorDisconnecting MeansAcross the Line StartingReduced Voltage Starting2) Motor ProtectionOvercurrent ProtectionOverload ProtectionOther Protection (voltage, phase, etc)Environment3) Stopping the MotorCoastingElectrical BrakingMechanical Braking4) Motor Operational ControlSpeed ControlReversingJoggingSequence Control An understanding of each of these areas is necessary to effectively apply Motor controlprinciples and equipment to effectively operate and protect a STARTINGAll motors must have a Control device to start and stop the Motor called a Motor controller.
2 MOTOR STARTING All motors must have a control device to start and stop the motor called a “motor controller”. Motor Controller A motor controller is the actual device that energizes and de-energizes the circuit to the motor so
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