Industrial Motor Control
7th Edition
ISBN: 9781133691808
Author: Stephen Herman
Publisher: Cengage Learning
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Chapter 27, Problem 7RQ
Refer to the circuit shown in Figure 27–2. Assume that the HOA switch is set in the Hand position. When the Start button is pressed, the red warning lamp lights. When the Start button is released, the light turns off, but the fan motor does not start. Each time the Start button is pressed, the warning lamp lights for as long as the Start button is held down, but it goes out each time the Start button is released, and the fan does not start. Which of the following could cause this condition?
- a. The Temp 1 switch is open.
- b. The M2 starter coil is open.
- c. The M1 starter coil is open.
- d. The Stop push button is open.
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