INDUSTRIAL MOTOR CONTROL
7th Edition
ISBN: 9780357670590
Author: Herman
Publisher: CENGAGE L
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Textbook Question
Chapter 54, Problem 1RQ
Why are NEMA symbols representing such components as push buttons, limit switches, and float switches not used in a programmable controller schematic?
Expert Solution & Answer
To determine
The reason why the NEMA symbols representing the components like push buttons, limit switches and the float switches are not used in the programmable control switches.
Explanation of Solution
The NEMA symbols are the symbols that are used to represent the electrical components.
Since, the PLC recognize only the closed and the open contacts only and it do not recognize that whether the swtich is connected to a component like push button, float swtich or the limit swtich. This is why the NEMA swtich is used in the programming of PLC.
Thus, to give the idea to PLC about the type of components connected, the NEMA symbols are used.
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Traffic Light System
Construct a PLC program for a traffic light system with the following condition:
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light for 20. The system will run continuously until the START/STOP switch is deactivated.
Figure 12: The traffic light system
Two Directional Control of Traffic Light
Extend the PLC program for the traffic light system with the following condition:.
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Design a PID controller for this system.
I want you to draw a ladder logic diagram of a garage door to control it by PLC. In my case we have different inputs and outputs and all of them gotta be used in the diagram. I can perfectly interpret the diagram so no need to explain it, I will just require you to draw it.
INPUTS : open push button ( OPB ) - close push button ( CPB ) - open limit switch ( OLS ) - close limit switch ( CLS ) - obstacle detection sensor ( ODS ) - safety sensor ( SS ) - emergency stop push button ( ESPB ) - reset button ( RB )
OUTPUTS : motor starts ( MS ) - motor stops ( MSTP ) - motor forward ( MF ) - motor reverse ( MR ) - Error display ( ER )
OPERATİNG MODES : automatic mode ( AM ) - manual mode ( MM )
NECESSARY TIMERS : T1 ( delay door movement after obstacle detection ) - T2 ( delay door movement after reversing )
Here is my excercise for today. Please I am requiring a good logic diagram taking into consideration all what was mentioned before.
so to sum up, I want you to write a logic ladder diagram…
Chapter 54 Solutions
INDUSTRIAL MOTOR CONTROL
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