Understanding Motor Controls
3rd Edition
ISBN: 9781305498129
Author: Stephen L. Herman
Publisher: Cengage Learning
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Textbook Question
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Chapter 5, Problem 6RQ
What pin numbers are connected to the coil of an 8-pin control relay?
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Chapter 5 Solutions
Understanding Motor Controls
Ch. 5 - Prob. 1RQCh. 5 - Prob. 2RQCh. 5 - Explain the difference between auxiliary contacts...Ch. 5 - Prob. 4RQCh. 5 - What is optoisolation and what is its main...Ch. 5 - What pin numbers are connected to the coil of an...Ch. 5 - An 11-pin control relay contains three sets of...Ch. 5 - What is the purpose of the shading coil?
Ch. 5 - Refer to the circuit shown in Figure 5-29. Is the...Ch. 5 - What is the difference between a motor starter and...
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- An 11-pin control relay contains three sets of single-pole double throw contacts. List the pin numbers by pairs that can be used as normally open contacts.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_forwardName two methods of sensing the current flow through the shunt field.arrow_forward
- Is the resistance in the start winding greater or less than the resistance in the run winding?arrow_forwardName three factors that determine the amount of induced voltage.arrow_forwardRefer to the schematic in Figure 7-10. Assume that when the START button is pressed, the control transformer fuse blows. What is the most likely cause of this trouble? Figure 7-10 Numbers are placed beside all components.arrow_forward
- Refer to the circuit shown in Figure 3311. You are to construct this circuit on the job. Would it be possible to use an 11 pin control relay for 4CR?arrow_forwardWhy are the contacts of a micro switch spring loaded?arrow_forwardThe diagram shows a brass rod and an iron rod beside each other at the bottom of a rectangular coil. What happens when a d.c. current passes through the coil? to d.c. supply rectangular coil brass iron rod rod Only the brass rod is magnetized Only the iron rod is magnetized The two rods attract each óther The two rods repel each other.arrow_forward
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