Understanding Motor Controls
4th Edition
ISBN: 9781337798686
Author: Stephen L. Herman
Publisher: Delmar Cengage Learning
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Chapter 11, Problem 10RQ
To determine
The two methods of changing the amount of time delay for the circuit shown in Figure 11-23.
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Chapter 11 Solutions
Understanding Motor Controls
Ch. 11 -
What are the two basic classifications of...Ch. 11 - Explain the operation of an on-delay relay.
Ch. 11 - Prob. 3RQCh. 11 - Prob. 4RQCh. 11 - How are pneumatic timers adjusted?Ch. 11 -
Name two methods used by electronic timers to...Ch. 11 - Refer to the circuit shown in Figure 1123. What is...Ch. 11 - Refer to the circuit shown in Figure 1123. What is...Ch. 11 - Refer to the circuit shown in Figure 1123. What is...Ch. 11 - Prob. 10RQ
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- Refer 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_forwardRefer 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 241. Assume that timer TR is set for a delay of 10 seconds. When the START button is pressed, the motor starts in low speed. After a delay of 30 seconds the motor is still in its lowest speed and has not accelerated to normal speed. Which of the following could not cause this condition? a. The START button is shorted. b. Timer coil TR is open. c. Contactor coil R is open. d. Timed contact TR did not close after a delay of 10 seconds.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_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_forwardRefer to the circuit shown in Figure 336. What is the function of contactor 2L?arrow_forward
- Refer 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_forwardRefer to the circuit shown in Figure 252. Assume that timer TR is set for a time delay of 10 seconds. When the START button is pressed, the motor does not start. After a period of 10 seconds, the motor starts with full line voltage applied to it. Which of the following could cause this condition? a. Timer TR coil is open. b. CR coil is open. c. Contactor S coil is open. d. Contactor R coil is open.arrow_forwardRefer 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_forward
- Refer to the circuit shown in Figure 42–21. Assume that a fused jumper is connected across terminals 1 and 3 of TR2 timer. What would happen if the jumper were left in place and the FIRST SPEED push button pressed? The motor would start in its lowest speed and progress to second speed, but never increase to third speed. The motor would start operating immediately in third speed. The motor would not start. The motor would start in second speed and then increase to third speed.arrow_forwardRefer to the circuit shown in Figure 247. Assume that all timers are set for a delay of 5 seconds. When the START button is pressed the motor starts in its lowest speed. After a delay of over 10 seconds, the motor is still running in the lowest speed. Which of the following could cause the problem? a. TR1 coil is open. b. TR1 coil is shorted. c. S2 coil is open. d. S1 coil is shorted.arrow_forwardFollowing the procedure discussed in Chapter 7, place wire numbers on the schematic in Figure 8–7. Place corresponding wire numbers on the components shown in Figure 8–8.arrow_forward
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