Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Textbook Question
Chapter 3, Problem 26SQ
Select the best answer for each of the following.
When the reset button does not reestablish the control circuit after an overload, the probable cause is
- a. the overload heater is too small.
- b. the overload trip has not cooled sufficiently.
- c. the auxiliary contacts are defective.
- d. the overload heater is burned out.
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Chapter 3 Solutions
Electric Motor Control
Ch. 3 - Prob. 1SQCh. 3 - How many poles are required on motor starters for...Ch. 3 - If a motor starter is installed according to...Ch. 3 - Using the time limit overload or the dashpot...Ch. 3 - What causes the AC hum or chatter in AC...Ch. 3 - What is the phase relationship between the flux in...Ch. 3 - In what AC and DC devices is the principle of the...Ch. 3 - What does the electrician look for to remedy the...Ch. 3 - What type of protective enclosure is most commonly...Ch. 3 - What advantage is there in using combination...
Ch. 3 - What safety feature does the combination starter...Ch. 3 - Prob. 12SQCh. 3 - How is the size of the overload heaters selected...Ch. 3 - What type of motor starter enclosure (include NEMA...Ch. 3 - Prob. 15SQCh. 3 - Prob. 16SQCh. 3 - Prob. 17SQCh. 3 - Prob. 18SQCh. 3 - Select the best answer for each of the following....Ch. 3 - Prob. 20SQCh. 3 - Prob. 21SQCh. 3 - Select the best answer for each of the following....Ch. 3 - Prob. 23SQCh. 3 - Select the best answer for each of the following....Ch. 3 - Select the best answer for each of the following....Ch. 3 - Select the best answer for each of the following....Ch. 3 - Select the best answer for each of the following....Ch. 3 - Prob. 28SQCh. 3 - Select the best answer for each of the following....Ch. 3 - Prob. 30SQCh. 3 - Prob. 31SQCh. 3 - What is the difference between a grounded control...Ch. 3 - A control transformer has a primary voltage of 480...
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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
- What is the purpose of the N/O contact in parallel with the start button in the magnetic start control circuit ..arrow_forwardIn Single phase motor starter is used for overload Protection. a. Wire b. MCB c. Relay d. Contactorarrow_forward2. Draw the schematic diagram of a six point Drum Switches that operate the long shunt compound dc motor in reverse –forward operation. Connect all the parts into the Drum Switch terminals only not in the outside of the Drum Switches. Explain your connection.arrow_forward
- 8. What instruction would you select for each of the following discrete input field devices to accomplish the desired task? (State the reason for your answer.) a. Turn on a light when a conveyor motor is running in reverse. The input field device is a set of con- tacts on the conveyor start relay that close when the motor is running forward and open when it is running in reverse. b. When a pushbutton is pressed, it operates a so- lenoid. The input field device is a normally open pushbutton. c. Stop a motor from running when a pushbutton is pressed. The input field device is a normally closed pushbutton. d. When a limit switch is closed, it triggers an instruc- tion ON. The input field device is a limit switch that stores a 1 in a data table bit when closed.arrow_forward13.a. A control system that doesn’t return position or velocity information from the motor back to the controlsystem is called a/anA. differential system.B. translated position system.C. directional system.D. open-loop system.13.b. You’re looking at a tachometer feedback signal on an oscilloscope. The waveform takes a long time togo to zero volts. This means that the system isA. critically dampened.B. at high speed.C. reversing direction.D. overdampened.arrow_forwardMultiple 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_forward
- Assume all of the timers are set for a 3 second delay. When the start button is pressed, nothing happens. None of the motors start. Which of the following could NOT cause this problem. a Overload contact OL1 is open b 1CR relay coil is open c 2CR relay coil is open d The stop button is openarrow_forwardsynchronous motorarrow_forward2. Assume that when the START button is pressed M starter does not energize. List seven possible causes for this problem.arrow_forward
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