Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
expand_more
expand_more
format_list_bulleted
Concept explainers
Videos
Textbook Question
Chapter 18, Problem 1SQ
Draw a control circuit with no-voltage protection. Describe how this method of wiring protects the machine operator.
Expert Solution & Answer
To determine
Draw a control circuit with no-voltage protection and describe how this method of wiring protects the machine operator.
Explanation of Solution
The three wire control circuit uses start-stop stations, momentary contact, and holding circuit interlock connected in a parallel form with the start pushbutton in order to maintain the circuit. The no-voltage protection can be obtained using the three wire control circuit. The control circuit with no-voltage protection is drawn as Figure 1.
In Figure 1, when the start pushbutton is pressed, the control circuit can be completed using coil M and closes all the M contacts. It leads to close the motor connection to the line by contacting the power circuits to the motor. The auxiliary contact M, which is connected in parallel with the start pushbutton, is also closed. This M contact is used to maintain the circuit to coil M when the start pushbutton is released. Such a contact is called as holding or sealing or maintaining contact.
When the stop pushbutton is pressed, the circuit brakes and opens the contact M. After releasing the stop pushbutton, the circuit remains the same because the start pushbutton and holding contact is in the open state. In order to complete the circuit, the start pushbutton should be pressed again.
If the supply voltage of the circuit fails, it could lead to de-energize the circuit. When the power or supply voltage is restored, the circuit remains in the open state until the start pushbutton is pressed manually. Therefore, this arrangement is called as no-voltage protection and such an arrangement is used to protect both the operator and the equipment.
Conclusion:
Thus, the control circuit with no-voltage protection is drawn and the working process is explained.
Want to see more full solutions like this?
Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!
Students have asked these similar questions
4.58.
Consider a causal discrete-time system whose output y[n] and input x[n] are related by
y[n]-[n-1]+[n−2] = x[n]
(a) Find its system function H(z).
(b) Find its impulse response h[n].
Ans. (a) H(z) =
z²
(z)(z)'
(b) h[n]=[3()" - 2()"]u[n]
|z|>
4.60. Determine the initial and final values of x[n] for each of the following X(z):
(a) X(z) =
(b) X(z) =
2z (z - 1/2)
(2-3)(2-3)12>
Z
2z² - 3z+1
, |z\> 1
Ans. (a) x[0] = 2, x[] = 0
(b) x[0]=0, x[0] = 1
1
2
(3)
I need expert solution,no error s please and handwriting solution
Chapter 18 Solutions
Electric Motor Control
Knowledge Booster
Learn more about
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
- Don't use ai to answer I will report you answerarrow_forward5.7 Design an STS switch for 128 primary TDM signals of the CCITT hierarchy (30 voice channels per input). Blocking should be less than 0.002 and the loading is 0.2 erlang per channel. How many time slot interchange modules are needed? What is the complexity of the switch? Repeat Problem 5.7 for a TST design.arrow_forwardNeed a solution please according to the book the answers are , number of memory bits is 48000 and complexity is 1504arrow_forward
- For the single-line diagram in the image, convert the zero-, positive-, and negative-sequence reactance date to per-unit using the given base quantities. Use subtransient machine reactances.Then, USE PowerWorld Simulator, create the generator, transmission line, and transformer input data files.Next, run the Simulator to compute subtransient fault currents for (1) single line-to-ground, (2) line-to-line, and (3) double line-to-ground bolted faults at each bus. Assume 1.0 per unit prefault voltage and neglect prefault load currents and all losses. Note: L2 = 25 kmShow input data files (machine, transmission line and transformers), output data (fault currents, bus volatges and line currents), and screenshots of the Simulation.arrow_forwardAnswer True or False, then correct errors or explain if any: 1. The term pole in filter terminology refers to the feedback circuit. 2, A voltage shunt feedback with Ai-10, A-20, p 0.45, then Aif will be 1. 3. The integrator Op-Amp circuit can be used to produce square waves. 4. The equivalent circuit of the crystal oscillator is series and parallel (R, C) components. 5. The transistor in a class A power amplifier conducts for the entire input cycle. 6. Bypass capacitors in an amplifier determine the low and high-frequency responses. 7. The midrange voltage gain of an amplifier is 100. The input RC circuit has a lower critical frequency of 1 kHz. The actual voltage gain at f- 100 Hz is 100. 8. The Bessel filter types produce almost ripple frequency response. 9. RC phase shift oscillators are based on both positive and negative feedback circuits. 10. In a high-pass filter, the roll-off region occurs above the critical frequency,arrow_forwardQ.1. Answer True or False and correct errors if found 1. In a certain Op-Amp. if Ad=3500, Ac=0.35, the CMRR=100dB. 2. The voltage series feedback can increase both input and output impedances. 3. A two-pole Sallen-Key high-pass filter contains one capacitor and two resistors. 4. The main feature of a crystal oscillator is the high frequency operation. Each transistor in a class B power amplifier conducts for the entire input cycle. ✓ The Q-point must be centered on the load line for maximum class A output signal swing 7. The differentiator Op-Amp can convert the triangle waveform into sinewave. ✗Class AB power amplifier eliminates crossover distortion found in pure class A. 9. Wien-bridge oscillators are based on positive feedback circuits. 10. The band-reject filter is composed of multiplication of LPF and HPF.arrow_forward
- Solve by Hand not using Chatgpt or AIarrow_forwardA. The ECG signal of a person shows an irregular heartbeat of 180 beats per minute. You areasked to come up with a system that digitises this signal, using an analog-to-digitalconverter (ADC) with a reference voltage of 5 V. The digitised signal should have a resolutionof 1 mV or better.i) How many samples per second should your system take in order to fully capture the ECGsignal?ii) What should the ADC’s resolution in bits be? Alternatively, how many quantisation levelsshould the ADC have; or how many bits per sample should the ADC have? B. You have successfully designed your ECG signal capture device. However, the person fromQuestion A is being examined in a room with fluorescent lights which have recently startedbuzzing. The digitised ECG signal appears to be very noisy, and the medical doctors arefinding it difficult to diagnose the patient. You suspect interference from the electrical mainsis to blame.You also notice that the ECG signal is very faint and not making full use of…arrow_forwardControls Systemsarrow_forward
- Question about Controls Systemsarrow_forwardA chemical processing plant requires a simplified safety control system to monitor critical conditions in one of its reactors. The system must evaluate three key parameters and activate two response levels. A combinational circuit with 3 sensors and 2 alarms needs to be designed for this purpose. Sensors: A: Reactor temperature (0 = normal, 1 = high) B: Reactor pressure (0 = normal, 1 = high) C: Mixture pH level (0 = normal, 1 = out of range) Alarms: X: Warning alarm Y: Activation of the emergency shutdown system System requirements: 1. The warning alarm (X) should activate when: At least two parameters are out of range. • Or when the temperature is high (A = 1) and any other parameter is out of range. 2. The emergency shutdown system (Y) must activate when: • All parameters are out of range simultaneously (A = 1, B = 1, C=1). • Or when the temperature and pressure are high simultaneously (A = 1 and B = 1), regardless of the pH level. Request: 1. Design the logic circuit for this…arrow_forwardAn industrial soft drink production plant needs to implement a quality control system for its bottling line. The system must monitor four critical parameters and activate different alarms depending on the conditions detected. It is required to design a digital circuit with 4 inputs and 3 outputs for this purpose. Inputs: A: Carbonation level (0 = normal, 1 = high) B: Liquid temperature (0 = normal, 1 = elevated) C: Line pressure (0 = normal, 1 = low) D: Filling speed (0 = normal, 1 = low) Outputs: X: Minor adjustment alarm (triggered when an odd number of parameters are out of range) Y: Major revision alarm (triggered when at least three parameters are out of range) Z: Adjacent parameters alarm (triggered when exactly two adjacent parameters are out of range System requirements: 1. The minor adjustment alarm (X) should activate when an odd number of parameters are out of range, indicating the need to make minor adjustments to the process. 2. The major overhaul alarm (Y) should activate…arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Delmar's Standard Textbook Of ElectricityElectrical EngineeringISBN:9781337900348Author:Stephen L. HermanPublisher:Cengage Learning
Electricity for Refrigeration, Heating, and Air C...Mechanical EngineeringISBN:9781337399128Author:Russell E. SmithPublisher:Cengage Learning
Delmar's Standard Textbook Of Electricity
Electrical Engineering
ISBN:9781337900348
Author:Stephen L. Herman
Publisher:Cengage Learning
Electricity for Refrigeration, Heating, and Air C...
Mechanical Engineering
ISBN:9781337399128
Author:Russell E. Smith
Publisher:Cengage Learning
Types of House Wiring - Types of Electrical Wiring - Electrical Wiring; Author: Learning Engineering;https://www.youtube.com/watch?v=A5P-buWX-dA;License: Standard Youtube License