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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 50, Problem 4SQ
Textbook Problem
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The brake in Figure 50–1 is not shown in the off position. Why?

Chapter 50, Problem 4SQ, The brake in Figure 501 is not shown in the off position. Why? FIG. 501 Reconnecting a crane

FIG. 50–1 Reconnecting a crane controller for different operations.

To determine

Explain the reason why the brake is not shown in the off position.

Explanation of Solution

Discussion:

Refer Figure 50-1 in the textbook that shows the circuit for reconnecting a crane controller for different operations. Figure 50-1 is through (A)-(F). The different operations of crane controller are maximum hoist, intermediate hoist, slow hoist, slow lower, intermediate lower, and maximum lower.

A series brake is used to limit the high speed of the motor...

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