EBK 3N3-EBK: INDUSTRIAL MOTOR CONTROL
7th Edition
ISBN: 9780176919962
Author: Herman
Publisher: VST
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Chapter 37, Problem 3RQ
Refer to the circuit shown in Figure 37–1. Assume that timer TR is set for a delay of 10 seconds. When the Start button is pressed, the motor starts in low speed. After a delay of 30 seconds, the motor is still in its lowest speed and has not accelerated to normal speed. Which of the following could not cause this condition?
- a. The Start button is shorted.
- b. Timer coil TR is open.
- c. Contactor coil R is open.
- d. Timed contact TR did not close after a delay of 10 seconds.
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