Understanding Motor Controls
4th Edition
ISBN: 9781337798686
Author: Stephen L. Herman
Publisher: Delmar Cengage Learning
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Textbook Question
Chapter 3, Problem 9RQ
Refer to the circuit shown in Figure 3–10. When would the amber pilot light be turned on?
- a. When the manual/automatic switch is set in the manual position.
- b. When the float switch contacts are closed.
- c. Anytime the manual starter is turned on.
- d. Only when the manual/automatic switch is set in the manual position.
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Chapter 3 Solutions
Understanding Motor Controls
Ch. 3 - A manual motor starter controls a single phase 120...Ch. 3 - Prob. 2RQCh. 3 - Prob. 3RQCh. 3 - A push button manual starter has tripped on...Ch. 3 - What is meant by the term line voltage on some...Ch. 3 - Explain the difference between manual motor...Ch. 3 - Prob. 7RQCh. 3 - Prob. 8RQCh. 3 - Refer to the circuit shown in Figure 310. When...Ch. 3 - Prob. 10RQ
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- To answer the following questions refer to the circuit in Figure 416. When the pressure switch closes, which starter will energize first, 1M or 2M? Explain your answer.arrow_forwardRefer to the circuit shown in Figure 16-11. Assume that the platform is located on the lower floor. When the UP push button is pressed, the platform rises. When the platform reaches the upper floor, however, the pump does not turn off but continues to run until the overload relay opens the overload contacts. Which of the following could cause this problem? a. The solenoid valve opened when limit switch LS1 opened. b. The UP push button is shorted. c. Limit switch LS1 did not open its contacts. d. Limit switch LS2 contacts did not reclose when the platform began to rise.arrow_forwardWhat type of float switch does not have a differential setting?arrow_forward
- Refer to the circuit shown in Figure 16-11. Assume that the platform is located on the bottom floor. When the UP push button is pressed the pump motor does not start. Which of the following could not cause this problem? The contacts of limit switch LS1 are open. The contacts of limit switch LS2 are open. Motor starter coil M is open. The overload contact is open.arrow_forwardWhat does the dashed line between the two float switch contacts labeled FS1 indicate?arrow_forwardRefer to the schematic diagram in Figure 318. Assume that the motor is not running. When the third 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 fourth 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. S3 contactor coil is open.arrow_forward
- Refer to Figure 21–1 to answer the following questions. When switch HOA SW 122 is in the off position, which contacts have connection between them?arrow_forwardWhen using a rod type float switch, how is the amount float movement required to open or close the contacts adjusted?arrow_forwardRefer to Figure 21–1 to answer the following questions. In what position must switch SW 123 be set to make connection between terminals 3 and 4?arrow_forward
- Refer to Figure 21–1 to answer the following questions. Assume that HOA SW 120 has been set in the auto position. List four ways by which coil CR-8 could be energized.arrow_forwardThe symbol shown is: a. Double acting push button b. Two-position selector switch c. Three-position selector switch d. Maintained contact push buttonarrow_forwardA push button manual starter has tripped on overload. Explain how to reset the starter so themotor can be restarted.arrow_forward
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