Bundle: Understanding Motor Controls, 4th + Mindtap Electrical, 2 Terms (12 Months) Printed Access Card
4th Edition
ISBN: 9780357097755
Author: Stephen L. Herman
Publisher: Cengage Learning
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Chapter 9, Problem 1RQ
To determine
Identify how the direction of rotation of a three-phase motor can be changed.
Expert Solution & Answer
Explanation of Solution
By changing any of the two motor leads, the direction of rotation of any three-phase motor can be reversed. Separate contactor will be required in each direction since the motor is connected to the power line regardless of the operating direction.
As per NEMA standards, the leads 1 and 3 will be changed for reversing and only one overload relay is needed to protect the motor. A reversing controller is one in which two separate contactors and one overload relay are built as one unit.
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Chapter 9 Solutions
Bundle: Understanding Motor Controls, 4th + Mindtap Electrical, 2 Terms (12 Months) Printed Access Card
Ch. 9 - Prob. 1RQCh. 9 - What is interlocking?Ch. 9 - Referring to the schematic shown in Figure 97, how...Ch. 9 - What would be the danger, if any, if the circuit...Ch. 9 - Prob. 5RQCh. 9 - Assume that the circuit shown in Figure 97 were to...Ch. 9 - Refer to the circuit shown in Figure 97. Assume...Ch. 9 - Prob. 8RQ
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