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Refer to the circuit shown in Figure 60–16. Assume that the motor is running in the forward direction. When the reverse push button is pressed, the motor continues to run in the forward direction. Which of the following could cause this problem? a. The normally open side of the reverse push button is not making a complete circuit when pressed. b. The R contactor coil is open. c. The normally closed side of the reverse push button is not breaking the circuit when the reverse push button is pressed. d. There is nothing wrong with the circuit. The stop push button must be pressed before the motor will stop running in the forward direction and permit the motor to be reversed.

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Electric Motor Control

10th Edition
Herman
Publisher: CENGAGE L
ISBN: 9781133702818

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Chapter
Section
BuyFindarrow_forward

Electric Motor Control

10th Edition
Herman
Publisher: CENGAGE L
ISBN: 9781133702818
Chapter 60, Problem 6SQ
Textbook Problem
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Refer to the circuit shown in Figure 60–16. Assume that the motor is running in the forward direction. When the reverse push button is pressed, the motor continues to run in the forward direction. Which of the following could cause this problem?

  1. a. The normally open side of the reverse push button is not making a complete circuit when pressed.
  2. b. The R contactor coil is open.
  3. c. The normally closed side of the reverse push button is not breaking the circuit when the reverse push button is pressed.
  4. d. There is nothing wrong with the circuit. The stop push button must be pressed before the motor will stop running in the forward direction and permit the motor to be reversed.

To determine

Choose the option that represents the cause for the problem that exists in the motor.

Explanation of Solution

Given data:

Refer to Figure 60-16 in the textbook for “Reversing starter with interlocks”.

The problem that exists in the motor is given as that the motor continues to work in the forward direction when the reverse push button is pressed.

Discussion:

From the given data, it is clear that the fault is with the reverse push button.

The probable cause for the problem that exists in the motor is that the normally closed side of the reverse push button does not break the circuit when it is pressed. Therefore, option (c) is an adequate option...

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