Industrial Motor Controls 14.a. Single sweep operation of a PLC is normally used to A. produce an output when a timer reaches preset value. B. issue a RUN command to the PLC. C. create a negative transition output coil. D. debug newly written ladder logic. 14.b. A photoeye will have which of the following abbreviations? A. PHOTO B. PE C. PHEYE D. PEYE

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Speed control of motor

Speed control by DC motor-speed controller is required to realize variable speed drive. Whenever a motor drives a particular load, it is called drive, and variable speed drive refers to a load requiring variable speed. All this is obtained by a DC motor speed controller.