Understanding Motor Controls
3rd Edition
ISBN: 9781305498129
Author: Stephen L. Herman
Publisher: Cengage Learning
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Textbook Question
Chapter 22, Problem 6RQ
Refer to the circuit shown in Figure 22–1. Should float switch FS2 be wired as normally open or normally closed? Explain your answer.
Figure 22–1 Pump control circuit.
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Chapter 22 Solutions
Understanding Motor Controls
Ch. 22 - Prob. 1RQCh. 22 - When connecting a control system, what should be...Ch. 22 - What should be done to each component to help...Ch. 22 - What is the disadvantage of wiring components to a...Ch. 22 - What is the main advantage of making connections...Ch. 22 - Refer to the circuit shown in Figure 221. Should...Ch. 22 - What does the dashed line between the two float...
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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_forwardReferring to the circuit in Figure 2–33, should the float switch be connected as a normally open or normally closed switch?arrow_forwardExplain the difference between cumulative- and differential-compounded connections.arrow_forward
- Refer 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 5-29. Is the thermostat contact normally open, normally closed, normally closed held open, or normally open held closed? Figure 5-29 The contactor contains both load and auxiliary contacts.arrow_forwardRefer to the circuit shown in Figure 33–6. You are to install this control system. How many auxiliary contacts should starter 1L contain and how many are normally open and how many are normally closed?arrow_forward
- Refer 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 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_forwardRefer to the circuit shown in Figure 15-6. If an overload should occur on the compressor motor and the overload contact open, would it affect the operation of the lube oil pump?arrow_forward
- To answer the following questions refer to the circuit shown in Figure 41–14. Assume that contact TS1 closes and the air injection blower motor starts operating, but the high-pressure pump motor does not start. What could cause this problem? Temperature switch TS3 is open. Coil 2M is open. Flow switch FL1 is defective and did not close. Coil TR is open.arrow_forwardTo answer the following questions refer to the circuit in Figure 416. The pressure switch is shown as: a. Normally open b. Normally closed c. Normally open held closed d. Normally closed held openarrow_forwardRefer to the circuit shown in Figure 108. In this circuit, the jog button has been connected incorrectly. The normally closed section has been connected in parallel with the run push button and the normally open section has been connected in series with the holding contacts. Explain how this circuit operates.arrow_forward
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