Industrial Motor Control
7th Edition
ISBN: 9781133691808
Author: Stephen Herman
Publisher: Cengage Learning
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Chapter 20, Problem 4RQ
Refer to circuit 2, shown in Figure 20–1. Assume that the timers are set for a delay of 5 seconds. When the START button is pressed, nothing happens. No motors start running for a period of 1 minute. Which of the following could not cause this problem?
- a. The M1 holding contacts did not close.
- b. The STOP push button is open.
- c. The OL1 contact is open.
- d. The M2 coil is open.
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