Understanding Motor Controls
Understanding Motor Controls
4th Edition
ISBN: 9781337798686
Author: Stephen L. Herman
Publisher: Delmar Cengage Learning
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Chapter 39, Problem 2RQ
To determine

Identify the way in which the components such as coils and contacts are identified in a PLC schematic.

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1. A mixing vat has an inlet valve, an outlet valve, a mixing motor, and a single level detecting switch (Figure 1). Both valves are opened by solenoids. The level switch closes when the vat is full and stays closed until the vat is empty. Draw a PLC ladder logic diagram and provide the allocation list to do the following: a. When the start button is pushed, the inlet valve opens until the vat is full. b. The mixer motor comes on for 5 min. c. The outlet valve opens until the vat is empty. (closed) Level switch Motor Inlet valve Outlet valve Float Vat Figure 1
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