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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 24, Problem 4SQ
Textbook Problem
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Explain in detail the purpose of a time-delay, low-voltage release relay assembly installed in a motor control circuit.

To determine

Explain the purpose of a time-delay, low-voltage release relay assembly installed in a motor control circuit.

Explanation of Solution

The sudden resume of the power supply to the machine after a long duration of power failure leads to damage machine, and it is injurious to an operator. Therefore, it is necessary to provide some prevention for motors from difficulties of restarting process.

Refer to Figure 24-1 in the Textbook, which illustrates the time-delay, low-voltage release relay device. If this device is used with the magnetic starter and a momentary contact push button station, the motor can automatically reconnect with the power lines after a voltage failure or voltage fluctuations of short duration...

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