Industrial Motor Control
7th Edition
ISBN: 9781133691808
Author: Stephen Herman
Publisher: Cengage Learning
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Textbook Question
Chapter 44, Problem 13RQ
Refer to the schematic diagram in Figure 44–8. Assume that the motor is not running. When the 3rd Speed push button is pressed, the motor starts in its lowest speed. After a delay of 3 seconds, the motor accelerates to second speed and 3 seconds later to third speed. After a period of about 1 minute, the 4th Speed push button is pressed, but the motor does not accelerate to fourth speed. Which of the following could cause this problem?
- a. Control relay CR2 coil is open.
- b. S2 contactor coil is open.
- c. CR3 coil is shorted.
- d. S2 contactor coil is open.
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Chapter 44 Solutions
Industrial Motor Control
Ch. 44 - Prob. 1RQCh. 44 - Prob. 2RQCh. 44 - A wound rotor induction motor has a stator that...Ch. 44 - Name three factors that determine the amount of...Ch. 44 - Prob. 5RQCh. 44 - Explain why controlling the rotor current controls...Ch. 44 - Prob. 7RQCh. 44 - Prob. 8RQCh. 44 - What is rotor slip?
Ch. 44 - Prob. 10RQ
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