Understanding Motor Controls
3rd Edition
ISBN: 9781305498129
Author: Stephen L. Herman
Publisher: Cengage Learning
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Chapter 24, Problem 3RQ
Refer to the circuit shown in Figure 24–1. Assume that timer TR is set for a delay of 10 seconds. When the START button is pressed, the motor starts in low speed. After a delay of 30 seconds the motor is still in its lowest speed and has not accelerated to normal speed. Which of the following could not cause this condition?
- a. The START button is shorted.
- b. Timer coil TR is open.
- c. Contactor coil R is open.
- d. Timed contact TR did not close after a delay of 10 seconds.
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