EBK 3N3-EBK: INDUSTRIAL MOTOR CONTROL
7th Edition
ISBN: 9780176919962
Author: Herman
Publisher: VST
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Chapter 39, Problem 4RQ
Refer to the circuit shown in Figure 39–9. Assume that timer TR is set for a delay of 10 seconds. When the Start button is pressed, the motor starts with its windings connected in wye. After a period of one minute, the motor has not changed from wye to delta. Which of the following could cause this condition?
- a. TR timer coil is open.
- b. S contactor coil is open.
- c. 1M starter coil is open.
- d. The control transformer fuse is blown.
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Chapter 39 Solutions
EBK 3N3-EBK: INDUSTRIAL MOTOR CONTROL
Ch. 39 - Name two requirements that must be met before a...Ch. 39 - Prob. 2RQCh. 39 - Prob. 3RQCh. 39 - Refer to the circuit shown in Figure 399. Assume...Ch. 39 - Refer to the circuit shown in Figure 39–9. Assume...Ch. 39 - Prob. 6RQCh. 39 - The motor nameplate of a wye–delta starter motor...Ch. 39 - Prob. 8RQCh. 39 - Refer to the circuit shown in Figure 3914. What is...Ch. 39 - Refer to the circuit shown in Figure 39–14. When...
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