Understanding Motor Controls
4th Edition
ISBN: 9781337798686
Author: Stephen L. Herman
Publisher: Delmar Cengage Learning
expand_more
expand_more
format_list_bulleted
Concept explainers
Videos
Textbook Question
Chapter 39, Problem 10RQ
In a control circuit, it is imperative that a coil energize before another one. How can this be done when entering a program into the memory of the PLC?
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
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
The symbol used for output device in PLC is
Oa.
O b.
HE
Oc.
d.
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 39 Solutions
Understanding Motor Controls
Ch. 39 - Why are NEMA symbols such as push buttons, float...Ch. 39 - Prob. 2RQCh. 39 - Why are normally closed components such as STOP...Ch. 39 - Prob. 4RQCh. 39 - Prob. 5RQCh. 39 - List four basic rules for developing a program for...Ch. 39 - A PLC requires that times be programmed in...Ch. 39 - When programming in Boolean, what statement should...Ch. 39 - When programming in Boolean, what statement should...Ch. 39 - In a control circuit, it is imperative that a coil...
Knowledge Booster
Learn more about
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
- Why are normally closed components such as STOP push buttons programmed normally open instead of normally closed when entering a program into the memory of a PLC?arrow_forwardWhat is the purpose of the key switch located on the front of the CPU in many programmable logic controllers?arrow_forwardA PLC requires that times be programmed in 0.1-second intervals. What number should be entered to produce a time delay of 3 minutes?arrow_forward
- In relation to the circuit presented below, mark the alternative(s) that you consider correct. 1 To enable actuator A2 to advance, it is necessary to switch valve V2 to the leftmost position and ensure that valve V1 is in its initial (intermediate) position. 2 Switching valve V2 to the leftmost position allows actuator A2 to advance, but for this to happen, valve V1 must also be switched to the leftmost position. 3 When activating valve V1, using the locking lever installed on the left side of it, the two actuators (A1 and A2) are allowed to advance. 4 Hydraulic pump B1 is a simple variable displacement type. 5 Valves V1 and V2 have a TANDEM center.arrow_forwardI need PLC diagram on PLC software or by hand.arrow_forwardThis is for my mechatronics class in regards to PLC and ladder diagrams It is common practice to include a NC contact after the coil to prevent overloading and overheating of a device such as a motor. True or Falsearrow_forward
- The symbol used for normally close contacts in PLC is a. O b. Oc. O d. HEarrow_forwardExplain the type of PLC, how it operates, the benefits and justification for using PLC within a hydraulic pressure test machine (used for pressure testing components)arrow_forwardExplain Automatic Door Open Close System PLC Ladder ?arrow_forward
- In motor controls, what is chattering or “machine gunning,” and why do we want to prevent it?arrow_forwardThe final control element in a closed loop control system is known as correction element megsurement element O comparison element processarrow_forwardChapter 18 Controlling a Preumatic System 461 Timing volume reservoir Goodheart-Willcox Publisher Figure 18-31, Timing-volume reservoirs allow ontrol of the sequence of a circuit using pilot-activated directional control valves.arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Understanding Motor ControlsMechanical EngineeringISBN:9781337798686Author:Stephen L. HermanPublisher:Delmar Cengage Learning
Understanding Motor Controls
Mechanical Engineering
ISBN:9781337798686
Author:Stephen L. Herman
Publisher:Delmar Cengage Learning
The Robot Revolution: The New Age of Manufacturing | Moving Upstream; Author: Wall Street Journal;https://www.youtube.com/watch?v=HX6M4QunVmA;License: Standard Youtube License