EBK 3N3-EBK: INDUSTRIAL MOTOR CONTROL
7th Edition
ISBN: 9780176919962
Author: Herman
Publisher: VST
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Textbook Question
Chapter 41, Problem 7RQ
Refer to the circuit shown in Figure 41–7. When the low-speed push button is pressed, the motor begins to run in low speed. When the high-speed push button is pressed, the motor stops running. Which of the following could cause this problem?
- a. 1L contactor coil is open.
- b. H contactor coil is open.
- c. PR relay coil is open.
- d. 2L contactor coil is open.
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Chapter 41 Solutions
EBK 3N3-EBK: INDUSTRIAL MOTOR CONTROL
Ch. 41 - Prob. 1RQCh. 41 - Prob. 2RQCh. 41 - What is the advantage of consequent pole motors...Ch. 41 - Prob. 4RQCh. 41 - Refer to the circuit shown in Figure 416. You are...Ch. 41 - Refer to the circuit shown in Figure 41–6. What is...Ch. 41 - Refer to the circuit shown in Figure 41–7. When...Ch. 41 - Prob. 8RQCh. 41 - Refer to the circuit shown in Figure 41–10....Ch. 41 - Refer to the circuit shown in Figure 4110. You are...
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- Refer to the circuit shown in Figure 33–7. When the low speed push button is pressed, the motor begins to run in low speed. When the high speed push button is pressed, the motor stops running. Which of the following could cause this problem? The 1L contactor coil is open. H contactor coil is open. PR relay coil is open. The 2L contactor coil is open.arrow_forwardRefer to the circuit shown in Figure 97. Assume that when the forward push button is pressed the motor does not start, but when the reverse push button is pressed the motor will start in the reverse direction. When the stop button is pressed the motor stops running. Which of the following could NOT cause this problem? a. The forward push button is defective. b. The F starter coil is open. c. The overload auxiliary contact is open. d. The normally closed R contact is open.arrow_forwardAn open winding in an electric motor means that A. the winding is making contact with the motor frame. B. one winding is making contact with another winding. C. a wire in one winding is broken. D. the centrifugal switch to the start winding is open.arrow_forward
- How do you check for an open armature winding?arrow_forwardRefer to the circuit shown in Figure 2614. When the START button is pressed, the control transformer fuse blows immediately. Which of the following could not cause this problem? a. Control relay coil CR is shorted. b. Starter coil 1M is shorted. c. Contactor coil S is shorted. d. Contactor coil 2M is shorted.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_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_forwardTo 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_forwardIs the resistance in the start winding greater or less than the resistance in the run winding?arrow_forward
- Assume that all three motors shown in Figure 12–14 are running. Now assume that the STOP button is pressed and motors #1 and #2 stop running, but motor #3 continues to operate. Which of the following could cause this problem? STOP button is shorted. The 2M contact between wire numbers 31 and 32 is hung closed. The 3M load contacts are welded shut. The normally open 3M contact between wire numbers 23 and 31 is hung closed.arrow_forwardWhat pin numbers are connected to the coil of an 8-pin control relay?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
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