INDUSTRIAL MOTOR CONTROL
7th Edition
ISBN: 9780357670590
Author: Herman
Publisher: CENGAGE L
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Question
Chapter 28, Problem 1RQ
To determine
Whether the component is generally normally closed or open when it is used for the function of start.
Expert Solution & Answer
Explanation of Solution
For the component that are used to start are generally normally open as initially they have open contacts and as the component is turned on the contacts get closed and the circuit starts to work.
Consider the Figure 28-2 the start button here is used to start the operation of the circuit and the other start button here is used to start the operation of the circuit. Where the other start button is connected in parallel to the already existing start button. So any one of both the switches can energize the coil M. Thus, the energized coil changes the position of the M contacts of the circuit. The contacts between the line and the load is then closed and the work starts. As the start button is released, the parallel connected auxiliary contacts gets closed and the circuit operation continues.
Thus, the switch is of normally open type.
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●
•
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Chapter 28 Solutions
INDUSTRIAL MOTOR CONTROL
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