Understanding Motor Controls
Understanding Motor Controls
4th Edition
ISBN: 9781337798686
Author: Stephen L. Herman
Publisher: Delmar Cengage Learning
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Chapter 33, Problem 7RQ

Refer to the circuit shown in Figure 33–7. When the low speed push button is pressed, the motor begins to run in low speed. When the high speed push button is pressed, the motor stops running. Which of the following could cause this problem?

  1. a. The 1L contactor coil is open.
  2. b. H contactor coil is open.
  3. c. PR relay coil is open.
  4. d. The 2L contactor coil is open.
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