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Refer to the circuit shown in Figure 60–16. The motor will not start in either the forward or reverse direction when the start push buttons are pressed. Which of the following could not cause this problem? a. The F coil is open. b. The overload contact is open. c. The control transformer fuse is blown. d. The stop push button is not making a complete circuit.

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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 60, Problem 5SQ
Textbook Problem
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Refer to the circuit shown in Figure 60–16. The motor will not start in either the forward or reverse direction when the start push buttons are pressed. Which of the following could not cause this problem?

  1. a. The F coil is open.
  2. b. The overload contact is open.
  3. c. The control transformer fuse is blown.
  4. d. The stop push button is not making a complete circuit.

To determine

Choose the option that does not represent 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 the motor is not started in either the forward or reverse direction when the start push buttons are pressed.

Discussion:

From Figure 60-16 in the textbook, the probable causes for the problem that exists in the motor are written as follows:

  • If the overload contact is in the open position, the motor does not start in both the directions.
  • As the supply is provided to the motor from the control transformer, the motor does not start in both the directions when the fuse of the control transformer is blown.
  • If the stop push button circuit is incompletely connected, then the motor does not start in both the directions...

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