Understanding Motor Controls
4th Edition
ISBN: 9781337798686
Author: Stephen L. Herman
Publisher: Delmar Cengage Learning
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Chapter 42, Problem 9RQ
To determine
The value of voltage indicated in the meter.
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Chapter 42 Solutions
Understanding Motor Controls
Ch. 42 - What are the three main electrical test...Ch. 42 - What is the advantage of a plunger type voltage...Ch. 42 - A motor is tripping out on overload. The motor...Ch. 42 - A motor is tripping out on overload. The motor...Ch. 42 - Prob. 5RQCh. 42 - Refer to the circuit shown in Figure 42–17. Assume...Ch. 42 - Prob. 7RQCh. 42 - Refer to the circuit shown in Figure 4221. Assume...Ch. 42 - Prob. 9RQCh. 42 - Refer to the circuit shown in Figure 42–21. Assume...
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- Refer to the circuit shown in Figure 5-29. Is the thermostat contact normally open, normally closed, normally closed held open, or normally open held closed? Figure 5-29 The contactor contains both load and auxiliary contacts.arrow_forwardTo answer the following questions refer to the circuit in Figure 416. The pressure switch is shown as: a. Normally open b. Normally closed c. Normally open held closed d. Normally closed held openarrow_forwardRefer to the circuit shown in Figure 247. Assume that all timers are set for a delay of 5 seconds. When the START button is pressed the motor starts in its lowest speed. After a delay of over 10 seconds, the motor is still running in the lowest speed. Which of the following could cause the problem? a. TR1 coil is open. b. TR1 coil is shorted. c. S2 coil is open. d. S1 coil is shorted.arrow_forward
- While discussing the circuit shown in Figure 15-66: Technician A says that the total resistance of the circuit is 1 ohm. Technician B says that the current flow through the 6-ohms of resistance is 12 amps. Who is correct? a. Technician A b. Technician B c. Both A and B d. Neither A nor Barrow_forwardTo answer the following questions refer to the circuit shown in Figure 4110. Assume that the third speed push button is pressed and the motor starts in its first or lowest speed. After a delay of 3 seconds, the motor accelerates to its second speed, but never accelerates to its highest or third speed. Which of the following could cause this problem? a. CR coil is open. b. Coil 2TR is open. c. Coil 1TR is open. d. Coil 1S is open.arrow_forwardRefer to the circuit shown in Figure 109. In this circuit the jog push button has again been connected incorrectly. The normally closed section of the button has been connected in series with the normally open run push button and the normally open section of the jog button is connecting in parallel with the holding contacts. Explain how this circuit operates.arrow_forward
- Voltage can be described as ____________ .arrow_forwardRefer to the circuit shown in Figure 42–17. Assume that the motor is running in the forward direction. When the revers e push button is pressed, the motor continues to run in the forward direction. Which of the following could cause this problem? The normally open side of the reverse push button is not making a complete circuit when pressed. R contactor coil is open. The normally closed side of the reverse push button is not breaking the circuit when the reverse push button is pressed. 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.arrow_forwardRefer to the circuit shown in Figure 107. Assume that when the start button is pressed the motor does not start, but when the inch push button is pressed the motor runs at reduced speed. Which of the following could NOT cause this problem? a. The control transformer fuse is blown. b. M starter coil is defective. c. The start push button is defective. d. The stop push button is defective.arrow_forward
- Refer to the circuit shown in Figure 2614. When the START button is pressed, the control transformer fuse blows immediately. Which of the following could not cause this problem? a. Control relay coil CR is shorted. b. Starter coil 1M is shorted. c. Contactor coil S is shorted. d. Contactor coil 2M is shorted.arrow_forwardTrue or False? A zero reading on an ohmmeter means the circuit or component is open.arrow_forwardRefer to the circuit shown in Figure 108. In this circuit, the jog button has been connected incorrectly. The normally closed section has been connected in parallel with the run push button and the normally open section has been connected in series with the holding contacts. Explain how this circuit operates.arrow_forward
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