Understanding Motor Controls
4th Edition
ISBN: 9781337798686
Author: Stephen L. Herman
Publisher: Delmar Cengage Learning
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Question
Chapter 4, Problem 12RQ
To determine
The size of the overload heater that should be used to protect the motor.
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Understanding Motor Controls
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- A large motor has a full load current rating of 425 amperes. Current transformers with a ratio of 600:5 are used to reduce the current to the overload heaters. What should be the full load current rating of the overload heaters?arrow_forwardA three-phase motor nameplate indicates a full load current of 362 amperes. The nameplate indicates that the heaters are to be sized for 125% of motor full load current. Current transformers with a ratio of 600:5 are used to reduce the motor current. Using the chart shown in Figure 4–7B, determine the size of overload heaters needed to protect this motor.arrow_forwardThe motor nameplate of a wye-delta started motor has a full load current of 287 amperes. What current rating should be used to determine the proper overload heater size?arrow_forward
- What hazard is involved in water-cooled transformers?arrow_forwardWhy is the hermetic compressor motor manufactured from special materials?arrow_forwardAn open single-phase motor with a centrifugal starting switch may not be used in A. an air-conditioning condenser fan motor. B. an air-conditioning indoor air handler. C. an area where explosive gases exist. D. a ventilating fan motor.arrow_forward
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