Electric Motors and Control Systems
2nd Edition
ISBN: 9780073373812
Author: Frank D. Petruzella
Publisher: McGraw-Hill Education
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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
List down the ISO symbols and its corresponding quantity in the pneumatic circuit diagram below:
II.
Circuit Analysis
The circuit below illustrates an electro-pneumatic system, answer the following questions:
+34V 1
3
4
2
S2E
Y1
5V
Pneumatic circuit
Electric circuit
1. What is the type of switch S1 and S2?
2. Is the electric circuit above direct or indirect? Explain why?
3. What is the name of the part which labeled as Y1?
4. Explain what happen when switch S1 is pressed.
5. Suggest a way to extend the cylinder, and what do you think is the application of this type of
circuit?
4,
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