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Electric Motor Control

10th Edition
Herman
Publisher: CENGAGE L
ISBN: 9781133702818

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BuyFindarrow_forward

Electric Motor Control

10th Edition
Herman
Publisher: CENGAGE L
ISBN: 9781133702818
Chapter 31, Problem 10SQ
Textbook Problem
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Is it necessary to press the stop button when changing from a high speed to a low speed in Figure 31–4? Why or why not?

To determine

Explain whether the stop button should be pressed when changing from a high speed to low speed shown in Figure 31-4.

Explanation of Solution

Refer to Figure 31-4 in the textbook, which shows the automatic speed control for a two-speed, two winding three-phase motor.

In the circuit, when switching the speed of the motor from a high speed to low speed, it is necessary to press the stop button first in order to close the interlock (H) in the low speed circuit when the motor running in high speed...

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