Understanding Motor Controls
4th Edition
ISBN: 9781337798686
Author: Stephen L. Herman
Publisher: Delmar Cengage Learning
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Textbook Question
Chapter 24, Problem 6RQ
Refer to the circuit shown in Figure 24–7. Assume that all timers are set for a delay of 5 seconds. When the START button is pressed the motor starts in its lowest speed. After a delay of over 10 seconds, the motor is still running in the lowest speed. Which of the following could cause the problem?
- a. TR1 coil is open.
- b. TR1 coil is shorted.
- c. S2 coil is open.
- d. S1 coil is shorted.
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