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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 3SQ
Textbook Problem
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Referring to Figure 50–1, what will happen if the controller is placed in the off position from a maximum lower position?

Chapter 50, Problem 3SQ, Referring to Figure 501, what will happen if the controller is placed in the off position from a

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

To determine

Explain what happens when a controller is placed in the off position from a maximum lower 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.

For the lowering positions, Figure 50-1(D) through (F) the regeneration back into the supply system is possible...

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