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Refer to the basic control schematic in Figure 34–4. The limit switch is shown as a. normally open. b. normally closed. c. normally open held closed. d. normally closed held open. Fig. 34–4 Wiring diagram of manual speed regulator interlocked with magnetic starter for control of slip ring motor (three-wire control).

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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 34, Problem 7SQ
Textbook Problem
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Refer to the basic control schematic in Figure 34–4. The limit switch is shown as

a. normally open.

b. normally closed.

c. normally open held closed.

d. normally closed held open.

Chapter 34, Problem 7SQ, Refer to the basic control schematic in Figure 344. The limit switch is shown as a. normally open.

Fig. 34–4 Wiring diagram of manual speed regulator interlocked with magnetic starter for control of slip ring motor (three-wire control).

To determine

Choose the correct option to find the position of the limit switch.

Explanation of Solution

Refer to Figure 1 for the symbol of the limit switch which is normally in the open state. The limit switch can be operated successfully when motion occurs in a machine part or presence of an object. It is an electromechanical device which includes an actuator that is mechanically linked to the set of contacts...

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