Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Question
Chapter 19, Problem 1SQ
To determine
Explain why the selector switch and a two-wire pilot device should be connected to the magnetic starter to control a large motor and they cannot be controlled directly.
Expert Solution & Answer
Explanation of Solution
If the contacts of the selector switch and automatic pilot device are large enough to pass the safety full-load current of motor, then they can control the motor directly, but the contact capacity of these devices is generally not large enough for huge motors.
Hence, these devices cannot be utilized to control the motor directly.
These two devices are connected to magnetic starter for controlling a large motor.
Conclusion:
Thus, the given statement is explained.
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Students have asked these similar questions
A selector switch and two - wire pilot device cannot be used to control a large motor directly but rather must be connected to a magnetic starter. Why this is true.?
List the probable causes if the armature dos notable release after the magnetic starter is de - energized .
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