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Refer to the circuit shown in Figure 37–1. A worker reports that the sump tank is overflowing, the wound rotor motor powering the pump has not started, and the alarm has not sounded. Which of the following could NOT cause this problem? a. The circuit breaker supplying three-phase power to the circuit is open. b. Control switch CS is open. c. Float switch FS1 is open. d. The control transformer fuse is open. Fig. 37–1 Wound rotor motor controlled by float switches.

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Electric Motor Control

10th Edition
Herman
Publisher: CENGAGE L
ISBN: 9781133702818

Solutions

Chapter
Section
BuyFindarrow_forward

Electric Motor Control

10th Edition
Herman
Publisher: CENGAGE L
ISBN: 9781133702818
Chapter 37, Problem 4SQ
Textbook Problem
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Refer to the circuit shown in Figure 37–1. A worker reports that the sump tank is overflowing, the wound rotor motor powering the pump has not started, and the alarm has not sounded. Which of the following could NOT cause this problem?

a. The circuit breaker supplying three-phase power to the circuit is open.

b. Control switch CS is open.

c. Float switch FS1 is open.

d. The control transformer fuse is open.

Chapter 37, Problem 4SQ, Refer to the circuit shown in Figure 371. A worker reports that the sump tank is overflowing, the

Fig. 37–1 Wound rotor motor controlled by float switches.

To determine

Choose the correct option that would not cause the following problem: when the tank is overflowing, the wound rotor motor has not started and the alarm has not sounded.

Explanation of Solution

Refer to Figure 37-1 in the textbook for the wound rotor control shown by the float switches. In this circuit, the float switches control the speed of a three-phase 2000 horsepower wound rotor motor to operate on 13,800 volts. The motor current is sensed by the current transformers and supplied to the overload (OL) heaters. This motor will power the pump which controls the water level in a pump located at the lowest level of a mine. Since there is seepage in the water mine, the sump is dug at the lowest level and the float switches are activated at different levels as shown in Figure 37-2 in the textbook. The power of the circuit is controlled by the control switch (CS). The green pilot light indicates the supply of power to the circuit. The emergency float switch (EFS) is placed at the uppermost level.

When the FS1 switch is closed, M contactor energizes and the motor operates at its low speed...

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