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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 48, Problem 1SQ
Textbook Problem
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In Figure 48–2, what is the purpose of normally closed contact F?

To determine

Explain the scope of normally closed (NC) contact (F) in Figure 48-2.

Explanation of Solution

Refer to Figure 48-2 in the textbook shows that plugging the motor to stop from one direction only. In this figure, the normally closed (NC) contact F is mentioned as an interlock.

In Figure 48-2, while the stop button is pressed, the forward contactor will drop out and the coil (F) is a de-energized normally closed (NC) contact F. This contact in turn, energizes coil (R) to operate the motor in the reverse direction through the closed plugging switch.

Conclusion:

Thus, the scope of normally closed (NC) contact (F) in the given figure is explained.

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