Understanding Motor Controls
4th Edition
ISBN: 9781337798686
Author: Stephen L. Herman
Publisher: Delmar Cengage Learning
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Textbook Question
Chapter 13, Problem 4RQ
A pressure switch is to be installed in a circuit that requires it to have three normally open contacts and one normally closed contact. The switch actually has one normally open
Contact What must be done to permit this pressure switch to operate in this circuit?
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Draw a series circuit with a thermostat,a low-pressure switch, and a highpressure switch used as safety controlsto protect a motor
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
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A(n) __________ switch uses a rotary motion to open and close contacts
Chapter 13 Solutions
Understanding Motor Controls
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.Similar questions
- When using a rod type float switch, how is the amount float movement required to open or close the contacts adjusted?arrow_forwardTo answer the following questions refer to the circuit in Figure 416. The pressure switch is shown as: a. Normally open b. Normally closed c. Normally open held closed d. Normally closed held openarrow_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_forward
- Refer to the circuit shown in Figure 5-29. Is the thermostat contact normally open, normally closed, normally closed held open, or normally open held closed? Figure 5-29 The contactor contains both load and auxiliary contacts.arrow_forwardReferring to the circuit in Figure 2–33, should the float switch be connected as a normally open or normally closed switch?arrow_forwardWhat type of pressure switch is generally used to sense small changes in low pressure systems?arrow_forward
- When a diac first turns on, does the voltage drop, remain at the same level, or increase to a higher level?arrow_forwardExplain the difference between auxiliary contacts and load contacts.arrow_forwardRefer to the circuit shown in Figure 109. In this circuit the jog push button has again been connected incorrectly. The normally closed section of the button has been connected in series with the normally open run push button and the normally open section of the jog button is connecting in parallel with the holding contacts. Explain how this circuit operates.arrow_forward
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