Understanding Motor Controls
4th Edition
ISBN: 9781337798686
Author: Stephen L. Herman
Publisher: Delmar Cengage Learning
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Question
Chapter 33, Problem 8RQ
To determine
Whether it is possible to run the motor in third speed when the coil 2CR is shorted.
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Chapter 33 Solutions
Understanding Motor Controls
Ch. 33 - Prob. 1RQCh. 33 - Prob. 2RQCh. 33 - What is the advantage of consequent pole motors...Ch. 33 - Prob. 4RQCh. 33 - Refer to the circuit shown in Figure 33–6. You are...Ch. 33 - Refer to the circuit shown in Figure 336. What is...Ch. 33 - Refer to the circuit shown in Figure 33–7. When...Ch. 33 - Prob. 8RQCh. 33 - Refer to the circuit shown in Figure 33–11....Ch. 33 - Refer to the circuit shown in Figure 3311. You are...
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- Explain how to set the neutral plane position by using the compensating winding.arrow_forwardThe nameplate of a motor lists the frame as 256T. What is the distance from the base of the motor to the center of the shaft?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 the circuit shown in Figure 33–11. Explain the action of the circuit if coil 2CR is shorted and the second speed push button is pressed.arrow_forwardRefer 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 transformer shown in Figure 5-13 to answer the following questions. What is the turns ratio of the winding between points B and E as compared to the winding between points D and E? Figure 5-13 Autotransformer practice problems.arrow_forward
- What type of field winding is made with many turns of small wire?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_forwardRefer to the circuit shown in Figure 7-10. If wire number 11 were disconnected at the normally open auxiliary M contact, how would the circuit operate? Figure 7-10 Numbers are placed beside all components.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 type of commutator is used with a brush-lifting repulsion-start induction-run motor?arrow_forwardA 480-volt three-phase load is rated at 34.5 kVA. It is to be supplied with variable three-phase voltage. Because the load is continuous, the transformers ratings are to be increased by 1.25% of the rated load. Three variable autotransformers are used to supply this load. Refer to Table 4-2 and determine the standard size of each transformer that should be used to make this connection.arrow_forward
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