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 48, Problem 1SQ
In Figure 48–2, what is the purpose of normally closed contact F?
Expert Solution & Answer
To determine
Explain the scope of normally closed (NC) contact (F) in Figure 48-2.
Explanation of Solution
Refer to Figure 48-2 in the textbook shows that plugging the motor to stop from one direction only. In this figure, the normally closed (NC) contact F is mentioned as an interlock.
In Figure 48-2, while the stop button is pressed, the forward contactor will drop out and the coil (F) is a de-energized normally closed (NC) contact F. This contact in turn, energizes coil (R) to operate the motor in the reverse direction through the closed plugging switch.
Conclusion:
Thus, the scope of normally closed (NC) contact (F) in the given figure 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
The voltage drop at brush-
commutator contact is variable (1-2V)
.and dependent of armature current
True O
False O
In what type of Power losses does armature circuit, brush-contact, and field circuit losses are considered?
a stray losses
b armature losses
c core losses
d copper losses
Explain by drawing how intermediate switch is working in ON and OFF position.
Chapter 48 Solutions
Electric Motor Control
Ch. 48 - In Figure 482, what is the purpose of normally...Ch. 48 - Can a time-delay relay be used satisfactorily in a...Ch. 48 - Prob. 3SQCh. 48 - Prob. 4SQCh. 48 - Prob. 5SQCh. 48 - What is the purpose of the lockout relay or safety...Ch. 48 - What happens if the reverse push button is closed...Ch. 48 - Prob. 8SQCh. 48 - Prob. 9SQCh. 48 - In Figure 487, is it necessary to push the stop...
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
- Referring to the circuit in Figure 412, what circuit component controls the actions of the two CR contacts?arrow_forward2. Which of the symbols in Figure A6 represents a circuit breaker with thermal overload protection?A. CB. DC. AD. Barrow_forwardExplain and discuss how the clamper circuit workarrow_forward
- 2. Explain electrical contact resistance. Holm model of electrical contact resistance. Contact hysteresis and main related parameters.arrow_forwardWhat happened if the DC voltage in the clamping circuit is replaced by an a.c source?arrow_forwardWhat is the difference between a open-clamp voltage and the short-circuit current. When do you use the open-clamp and when do you use the short-circuit?arrow_forward
- 1. What is a cold solder in electronics?2. What will happen if there is a cold solder? 3. What is a heat sink? What is its importance?arrow_forwardQuestion 1 List the pins on Arduino that can do analog write. In a PWM, given that the duty cycle is 80% what is the voltage output? In a PWM, what should be the duty cycle to get a voltage output of 4.5 V? Given the bellow Arduino command: analogWrite( 8, 200); What is the duty cycle? What is the voltage output?arrow_forwardA step up chopper has an input of 200 volts and output of 250 volts. The blocking period is each cycle is 0.6x10-3 seconds. Find the period of conduction in each cycle and frequency of operation?arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Diodes Explained - The basics how diodes work working principle pn junction; Author: The Engineering Mindset;https://www.youtube.com/watch?v=Fwj_d3uO5g8;License: Standard Youtube License