Industrial Motor Control
7th Edition
ISBN: 9781133691808
Author: Stephen Herman
Publisher: Cengage Learning
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Textbook Question
Chapter 11, Problem 4RQ
Refer to the circuit shown in Figure 11–11. Assume that the platform is located on the lower floor. When the UP push-button is pressed, the platform raises. When the platform reaches the upper floor, however, the pump does not turn off, but continues to run until the overload relay opens the overload contacts. Which of the following could cause this problem?
- a. The solenoid valve opened when limit switch LS1 opened.
- b. The UP push-button is shorted.
- c. Limit switch LS1 did not open its contacts.
- d. Limit switch LS2 contacts did not re-close when the platform began to rise.
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