Industrial Motor Control
7th Edition
ISBN: 9781133691808
Author: Stephen Herman
Publisher: Cengage Learning
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Textbook Question
Chapter 25, Problem 1RQ
Refer to Figure 25–1 to answer the following questions.
When switch HOA SW 122 is in the OFF position, which contacts have connection between them?
Expert Solution & Answer
To determine
The contacts that have connection between them when the switch is in off position.
Explanation of Solution
Refer to the table for the HOA SW 122. The X shows that for the connection between the two contacts the O indicates that there is no connection between the two contacts.
The case when the switch HOA SW 122 is in the off state, the contact
Thus, the contact that have connection between them is
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Chapter 25 Solutions
Industrial Motor Control
Ch. 25 - Refer to Figure 251 to answer the following...Ch. 25 - Refer to Figure 25–1 to answer the following...Ch. 25 - Refer to Figure 25–1 to answer the following...Ch. 25 - Prob. 4RQCh. 25 - Prob. 5RQCh. 25 - Prob. 6RQCh. 25 - Prob. 7RQCh. 25 - Refer to Figure 251 to answer the following...Ch. 25 - Refer to Figure 25–1 to answer the following...Ch. 25 - Prob. 10RQ
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- Refer 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_forwardRefer to Figure 211 to answer the following questions. Referring to switch (RS SW 123), in what position must the switch be set to make connection between terminals 3 and 4?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
- Refer 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_forwardRefer 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_forwardRefer to the circuit shown in Figure 15-6. The STOP button is shown to be an emergency STOP button. What does the symbol used for the STOP button actually represent?arrow_forward
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- Refer to the circuit shown in Figure 25–5. Assume that timer TR1 is set for a delay of 10 seconds and timer TR2 is set for a delay of 5 seconds. When the START button is pressed, the motor starts. After 10 seconds the S1 contacts open and the motor continues to accelerate, but never reaches full speed. After a delay of about 30 seconds, the motor trips out on overload. Which of the following could cause this problem? TR1 coil is open. S2 coil is open. S1 coil is open. R coil is open.arrow_forwardRefer 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_forwardRefer to the circuit shown in Figure 5-29. In this circuit, the HR contactor is equipped with five contacts. Three are load contacts and two are auxiliary contacts. From looking at the schematic diagram, how is it possible to identify which contacts are the load contacts and which are the auxiliary contacts? Figure 5-29 The contactor contains both load and auxiliary contacts.arrow_forward
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