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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 21, Problem 8SQ
Textbook Problem
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What is the sequence of the operations if the limit switches, shown in Figure 21–6, are used. (Limit switches were covered in Unit 13.)

Chapter 21, Problem 8SQ, What is the sequence of the operations if the limit switches, shown in Figure 216, are used. (Limit

Fig. 21–6 Elementary diagram of the reversing starter shown in Figure 21–1. The mechanical, push-button, and auxiliary contact interlocks are indicated.

To determine

Explain the sequence of operation if the limit switches are used in Figure 21-6.

Explanation of Solution

When forward push button is pressed, the motor will run in forward direction due to the energization of forward contactor coil. The normally closed forward auxiliary contact opens to prevent the energization of reverse contactor coil.

Similarly, when reverse push button is pressed, the motor will run in reverse direction due to the energization of reverse contactor coil. The normally closed reverse auxiliary contact opens to prevent the energization of forward contactor coil...

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