Understanding Motor Controls
3rd Edition
ISBN: 9781305498129
Author: Stephen L. Herman
Publisher: Cengage Learning
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Chapter 39, Problem 5RQ
To determine
Identify why the PLC output is used to energize the coil of the motor starter instead of the motor coil.
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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...
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- 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?arrow_forwardWhy 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 do you think is the most important component of the PLC? Explain why.arrow_forward
- Explain 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_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_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
- In motor controls, what is chattering or “machine gunning,” and why do we want to prevent it?arrow_forwardBlock diagram and explanation of the applications of open loop system: Automatic washing machine, Automatic toaster system, Traffic light controller and Furnace without thermostatic control but with timing devicearrow_forward11). Controllers can be divided into _____________ type, and _____________ type controllers due to their different design methods.arrow_forward
- Why are NEMA symbols such as push buttons, float switches, or limit switches not used in programmable logic controller schematics?arrow_forwardWhat is opto-isolation?arrow_forwardPneumatics problem 1. What is an automatic controller? 2. What is the difference between a close loop and open-loop system?arrow_forward
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