Electric Motor Control
Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
bartleby

Concept explainers

Question
Book Icon
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
Check Mark

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.

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
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 .
6.a. When you're taking a PM motor apart you should exercise special care not to damage theA. end bells.B. commutator.C. permanent magnets.D. brush holders.6.b. A PM field servo motor may be equipped with a resolver that is used toA. excite the armature windings.B. create a voltage that increases with velocity.C. prevent the brushes from sparking.D. feed back position information.
Knowledge Booster
Background pattern image
Electrical Engineering
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
SEE MORE QUESTIONS
Recommended textbooks for you
Text book image
Electric Motor Control
Electrical Engineering
ISBN:9781133702818
Author:Herman
Publisher:CENGAGE L
Text book image
Electricity for Refrigeration, Heating, and Air C...
Mechanical Engineering
ISBN:9781337399128
Author:Russell E. Smith
Publisher:Cengage Learning