Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Textbook Question
Chapter 10, Problem 7SQ
Refer to the circuit shown in Figure 10–5. Assume that the motor is running and an overload occurs, which causes the OL contact to open and disconnect coil M to stop the motor. What effect does the opening of the overload contact have on the pressure switch circuit?
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Chapter 10 Solutions
Electric Motor Control
Ch. 10 - Describe how pressure switches are connected to...Ch. 10 - What type of pressure switch is generally used to...Ch. 10 - A pressure switch is set to cut in at a pressure...Ch. 10 - A pressure switch is to be installed on a system...Ch. 10 - A pressure switch is to be installed in a circuit...Ch. 10 - Refer to the circuit shown in Figure 105. If the...Ch. 10 - Refer to the circuit shown in Figure 105. Assume...Ch. 10 - Refer to the circuit shown in Figure 106. Assume...Ch. 10 - Refer to the circuit shown in Figure 106. Assume...Ch. 10 - Refer to Figure 106. When the thermostat contact...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, electrical-engineering and related others by exploring similar questions and additional content below.Similar questions
- Please solve this question in control system quicklyarrow_forwardAssume that HOA SW 120 has been set in the AUTO position. List four ways by which coil CR-8 could be energized.arrow_forwardDescribe how pressure switches are connected to start and stop (a) small motors and (b) large motors.arrow_forward
- Multiple choices cont.: c. The 3M load contacts are welded shut. d. The normally open 3M contact between wire numbers 23 and 31 is hung closed.arrow_forwardIf a centrifugal switch assembly in a split-phase or capacitor motor fails, you'll most likely have a A. slowly turning motor.B. loudly humming motor.C. motor turning at too high a speed. D. motor that has reversed direction while running.arrow_forwardWhat is the answer for Question 13?arrow_forward
- 4.a. The device which responds to the heat developed within the motor is theA. shading coil.B. short-circuiter.C. bimetallic protector.D. current-operated relay.4.b. How is a rotating magnetic field produced during starting in a split-phase motor?A. A capacitor is inserted in the auxiliary-winding circuit.B. A low resistance coil is placed around a portion of each pole.C. Brushes are shifted off the hard-neutral position.D. An auxiliary winding is made with a high ratio of resistance to reactance.arrow_forwardWhy are thermistors often used as solid-state starting relays?arrow_forwardQ5. Describe the following to protect and control the motors: (i) Using circuit diagram and the current-time characteristics, explain the motor overload protection by thermal overload relay. Explain using a circuit diagram how the motor will automatic shutdown when input (ii) fails? (iii) Explain using circuit diagram the under voltage protection of a motor (iv) Draw the circuit diagram to explain the adjustable-frequency drive for a 3-phase induction motorarrow_forward
- what are designed to protect the motor from an overload conditionarrow_forwardRefer to the circuit shown in Figure 105. If the pressure should become high enough for the pressure switch to close and stop the motor, is it possible to restart the motor before the pressure drops to a safe level?arrow_forward٥arrow_forward
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