Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
expand_more
expand_more
format_list_bulleted
Concept explainers
Question
Chapter 9, Problem 6SQ
To determine
Sketch an elementary diagram of a fractional horsepower (FHP), manual motor starter.
Expert Solution & Answer
Trending nowThis is a popular solution!
Students have asked these similar questions
The disconnecting means for a motor controller shall be designed so that it does not _______ automatically per NEC 430.103
A. Open
B. Close
C. Restart
D. Shutdown
If a timing relay fails to cut in the run starter, what percentage of the full load current can the motor carry safely?
If an electrical defect occurs in the electronic powersteering(EPS) system, __ .a. the system continues to operate normally, but theEPS warning light is illuminatedb. the system continues to operate with a slightlyreduced power-steering assistc. the EPS control unit shuts the system down byopening the fail-safe and power relaysd. the EPS control unit locks the armature in thesteering gear to prevent armature and screw shaftdamage
Chapter 9 Solutions
Electric Motor Control
Ch. 9 - List several applications for a motor-driven...Ch. 9 - Which timer is the most commonly used in...Ch. 9 - How is a pneumatic timer adjusted?Ch. 9 - List six factors to be considered when selecting a...Ch. 9 - List several additional factors that will affect...Ch. 9 - Prob. 6SQCh. 9 - Connect these components in Figure 917: a. The...Ch. 9 - Connect the following components in Figure 918: a....
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
A 10 hp single phase motor is connected to 240 volts. The motor nameplate indicates a NEMA code B, a full load running current of 47.5 amperes and a temperature rise of 40 degrees C. What size copper conductors with THWN insulation should be used to connect this motor?
arrow_forward
7. Which statement is true for the process-control relay ladder diagram shown in the figure?
A. The pressure switch, temperature switch, and push button must be closed for the motor to start.
B. With the temperature switch closed, the motor will start once the push button is pressed.
C. With the pressure switch closed and the push button released, the motor will start.
D. Only the temperature switch has to close for the motor to start.
arrow_forward
8.a. What is the purpose of relay CRE in the roll stand machine?A. Relay CRE is used as an emergency stop relay.B. Relay CRE is used to control an alarm light.C. Relay CRE is used to power the PLC.D. Relay CRE is used to power the input modules.
8.b. Which one of the following statements is true of a disabled contact or coil?A. The disabled element has been automatically disabled due to module failure.B. The disabled element is held false by the PLC.C. A disabled contact or coil is caused by a faulty memory location in the PLC.D. A contact must be in the disabled state before it can be forced ON or OFF.
arrow_forward
All answers should be written in complete sentences. Calculations should be shown in detail, and Codereferences should be cited when appropriate. Unless otherwise stated, all conductors are copper type THHN, and the supply is AC.
1.What is the full-load current of a 600-volt, 3-phase, 50-horsepower induction motor?
arrow_forward
Q.11
A normally open auxiliary contact connected in parallel to maintain a circuit to the relay coil when the push button is released is part of what type of control circuit?
Select one:
A. START-STOP PUSH BUTTON
B. JOGGING SWITCH
C. STARTING SWITCH
D. EMERGENCY STOP BUTTON
arrow_forward
a 10hp single-phase motor is connected to 240 volts. the motor nameplate indicates a NEMA Code B, a full-load running current of 47.5 amperes, and a temperature rise of 40⁰C. what size copper conductors with THWN insulation should be used to connect this motor?
arrow_forward
A 30- hp squirrel cage induction motor is connected to a 240-volt three phase feeder. The motor is to be replaced with a 50-hp squirrel cage induction motor connected to 480 volts. The motor has a nema code b, a full load current of 49.8 amps, and an sf of 1.10. the present conductors are 3 awg copper with thwn insulation. Are these conductors sufficient to connect to the 50-hp motor or will they have to be replaced
arrow_forward
List six factors to be considered when selecting a timing relay for a particular use.
arrow_forward
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.
arrow_forward
2. In the motor control circuit of Figure 11 in your study unit, the operation of any one of the overload relays has which of the following effects?A. The motor only runs two phases.B. The motor operates normally. C. The auxiliary contact M closes. D. The motor stops
arrow_forward
QUESTION 18
The instantaneous contacts of a timer are drawn in the same manner as standard relay contacts.
True
False
arrow_forward
A 460VAC rated, 60 Hz, 125-Hp Three-phase induction type motor is to be connected for across-the-line starting. The nameplate indicates the motor’s maximum ampere rating, 160A. It has a NEMA code letter B. The ambient temp of the installation place is and TW copper will be used. Short-circuit protection device that will be used is Inverse Time Breaker.
Calculate the Motor Starter Size.
arrow_forward
arrow_back_ios
arrow_forward_ios
Recommended textbooks for you
Electricity for Refrigeration, Heating, and Air C...
Mechanical Engineering
ISBN:9781337399128
Author:Russell E. Smith
Publisher:Cengage Learning
Electricity for Refrigeration, Heating, and Air C...
Mechanical Engineering
ISBN:9781337399128
Author:Russell E. Smith
Publisher:Cengage Learning