Understanding Motor Controls
Understanding Motor Controls
4th Edition
ISBN: 9781337798686
Author: Stephen L. Herman
Publisher: Delmar Cengage Learning
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Chapter 12, Problem 3RQ

Assume that all three motors shown in Figure 12–14 are running. Now assume that the STOP button is pressed and motors #1 and #2 stop running, but motor #3 continues to operate. Which of the following could cause this problem?

  1. a. STOP button is shorted.
  2. b. The 2M contact between wire numbers 31 and 32 is hung closed.
  3. c. The 3M load contacts are welded shut.
  4. d. The normally open 3M contact between wire numbers 23 and 31 is hung closed.
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