Industrial Motor Control
7th Edition
ISBN: 9781133691808
Author: Stephen Herman
Publisher: Cengage Learning
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Question
Chapter 54, Problem 5RQ
To determine
The number that is set on a timer to be programmed for the delay of 3 minutes.
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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
Build a ladder logic diagram showing the timer delays.
QUESTION 27
Pneumatic timers have better repeat accuracy that electronic timers.
True
False
Chapter 54 Solutions
Industrial Motor Control
Ch. 54 - Why are NEMA symbols representing such components...Ch. 54 - Explain how to program an internal relay into the...Ch. 54 - Why are the contacts used to represent stop...Ch. 54 - Why is the output I/O used to energize a motor...Ch. 54 - Prob. 5RQCh. 54 - When programming in Boolean, what command is used...Ch. 54 - When programming in Boolean, what command is used...Ch. 54 - When programming in Boolean, what command is used...Ch. 54 - Why are the numbers 8 and 9 not used in an OCTAL-...
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