EBK 3N3-EBK: INDUSTRIAL MOTOR CONTROL
7th Edition
ISBN: 9780176919962
Author: Herman
Publisher: VST
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Chapter 11, Problem 3RQ
Refer to the circuit shown in Figure 11–11. Assume that the platform is located on the bottom floor. When the UP push button is pressed, the pump motor does not start. Which of the following could not cause this problem?
- a. The contacts of limit switch LS1 are closed.
- b. The contacts of limit switch LS2 are open.
- c. Motor starter coil M is open.
- d. The overload contact is open.
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EBK 3N3-EBK: INDUSTRIAL MOTOR CONTROL
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