Electric Motors and Control Systems
2nd Edition
ISBN: 9780073373812
Author: Frank D. Petruzella
Publisher: McGraw-Hill Education
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Question
Chapter 7.5, Problem 2RQ
To determine
Type of controller that is based on relay control logic.
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In what ways do controllers for various devices aid in operation?
Block diagram and explanation of the applications of open loop system: Automatic washing machine, Automatic toaster system, Traffic light controller and Furnace without thermostatic control but with timing device
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
Chapter 7 Solutions
Electric Motors and Control Systems
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