Industrial Motor Control
7th Edition
ISBN: 9781133691808
Author: Stephen Herman
Publisher: Cengage Learning
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Question
Chapter 48, Problem 1RQ
To determine
The correct option for the pressure swtich.
Expert Solution & Answer
Explanation of Solution
Refer to the circuit in Figure 48-6 in the text book. The pressure swtich found the application where it is necessary to sense the pressure of the pneumatic or hydraulics system.
The pressure switch in the figure is normally closed and is held open as the circuit must be completed before the pressure is released.
Thus, the correct option is d. The normally closed held open.
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The diagram shows a brass rod and an iron rod beside each other at the bottom of a
rectangular coil. What happens when a d.c. current passes through the coil?
to d.c.
supply
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Only the brass rod is magnetized
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23. Draw the following symbols:
a. double acting, momentary contact push button.
b. normally open pressure switch
C. current transformer.
d. Normally closed float switch.
e. normally open limit switch.
F. normally closed switch.
Name
Section 5-2: Line Diagrams-Signals,
Decisions, and Actions
In the following application, a temperature switch controls a heating contactor and a flow switch is used to
ensure there is enough air flow. If there is not enough air flow, an alarm is sounded. Complete the required
information.
1. List all the signal devices in the circuit.
2. List all the action devices in the circuit.
3. List the decision part of the circuit that automatically sounds the alarm if there is a problem.
4. When the heating element is on during normal operation, is the flow switch open or closed?
CIRCULATING
2
L1
FAN
TEMPERATURE
SWITCH
TR
HEATING
ELEMENTS
FLOW
SWITCH
-HOT AIR
PADDLE
AIR FILTER
NORMALLY CLOSED
FLOW SWITCH
65
ALARM
(SOUNDS IF NO FLOW FOR
15 SECONDS OR MORE)
Date
HEATING
CONTACTOR
TR
ON-DELAY
TIMER
SUPPLY AIR
COLD AIR
(3) TIME SET= 15 SEC
© 2014 American Technical Publishers, Inc.
All rights reserved
Chapter 48 Solutions
Industrial Motor Control
Ch. 48 - Prob. 1RQCh. 48 - To answer the following questions, refer to the...Ch. 48 - Prob. 3RQCh. 48 - To answer the following questions, refer to the...Ch. 48 - To answer the following questions, refer to the...Ch. 48 - Prob. 6RQCh. 48 - To answer the following questions, refer to the...Ch. 48 - To answer the following questions, refer to the...Ch. 48 - Prob. 9RQCh. 48 - Prob. 10RQ
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- To answer the following questions refer to the circuit in Figure 416. What is the purpose of the rotary switch connected after the pressure switch?arrow_forwardThe symbol shown is: a. Double acting push button b. Two-position selector switch c. Three-position selector switch d. Maintained contact push buttonarrow_forwardRefer to Figure 21–1 to answer the following questions. In what position must switch SW 123 be set to make connection between terminals 3 and 4?arrow_forward
- What is the primary use of a limit switch?arrow_forwardRefer to the circuit shown in Figure 16-11. Assume that the platform is located on the lower floor. When the UP push button is pressed, the platform rises. 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 reclose when the platform began to rise.arrow_forwardReferring to the circuit in Figure 2–33, should the float switch be connected as a normally open or normally closed switch?arrow_forward
- In a tap set, the plug tap is the final one and is also known as taper tap. Select one: True Falsearrow_forwardTo answer the following questions refer to the circuit shown in Figure 41–10. Assume that the third speed push button is pressed. Explain the sequence of operation for the circuit.arrow_forwardWhen using a rod type float switch, how is the amount float movement required to open or close the contacts adjusted?arrow_forward
- The symbol shown is: Normally closed float switch Normally open held closed float switch Normally open float switch Normally closed held open float switcharrow_forward2arrow_forwardTo answer the following questions refer to the circuit shown in Figure 4110. Assume that the third speed push button is pressed and the motor starts in its first or lowest speed. After a delay of 3 seconds, the motor accelerates to its second speed, but never accelerates to its highest or third speed. Which of the following could cause this problem? a. CR coil is open. b. Coil 2TR is open. c. Coil 1TR is open. d. Coil 1S is open.arrow_forward
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