Understanding Motor Controls
4th Edition
ISBN: 9781337798686
Author: Stephen L. Herman
Publisher: Delmar Cengage Learning
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Chapter 39, Problem 7RQ
A PLC requires that times be programmed in 0.1-second intervals. What number should be entered to produce a time delay of 3 minutes?
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An emergency stop system is to be designed for a certain automatic production machine. A single “start” button is used to turn on the power to the machine at the beginning of the day. In addition, there are two “stop” buttons located at two locations on the machine, either of which can be pressed to immediately turn off power to the machine. Let X1 = start button (normally open), X2 = stop button 1 (normally closed), X3 = stop button 2 (normally closed), and Y = power-to-machine. (a) Construct the truth table for this system. (b) Write the Boolean logic expression for the system. (c) Construct the ladder logic diagram for the 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…
what type of CNC programming command sets the machine into a certain mode, which stays active beyond the block in which it was defined
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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- 2) The continuous stopwatch timing method was used to obtain the observed times for a worker-machine task. Only one cycle was timed. The data are recorded in the table below. The times are listed indicate the stopwatch reading at the end of the element. Elements a, b, and d are worker-controlled elements. Element c is machine controlled. Elements a and d are external to the machine-controlled element, while element b is internal. Every four cycles, there is an irregular worker element that takes 1.32 min rated at 100% performance. For determining the standard time, the PFD allowance is 15% and the machine allowance is 30%. Determine a. The normal time b. Standard time for the cycle c. If worker efficiency is 100%, how many units will be produced in one 8-hour shift? d. If the actual time worked during the shift is 6.86 hours, and the worker performance is 125%, how many units will be produced? Description of Worker Time Description of (min) Rating (%) Element Machine Element Worker…arrow_forwardAn emergency stop system is to be designed for a certain automatic production machine. A single "start" button is used to turn on the power to the machine at the beginning of the day. In addition, there are three "stop" buttons located at different locations around the machine, any one of which can be pressed to immediately turn off power to the machine. (a) Write the truth table for this system. (b) Write the Boolean logic expression for the system. (c) Construct the logic network diagram for the system. (d) Construct the ladder logic diagram for the systemarrow_forwardFundamental of mechatronics technologyarrow_forward
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- 17- The memory unit of PLC is used to write the program to control output device. Select one: True Falsearrow_forward5. You need to know the resolution of the control. How many counts are there for 1 degree of motion?arrow_forwardData Ino D 0 D ° 20 9 ° ge Q4 Clock After 5 clock pulses, what would the values of Q1-Q4 outputs be given the sequence provided as "Data In" is: 0, 1, 1, 0, 0, 1, 0, 1 (input starts on the right) Q1 Q2 Q2 What about after an additional 5 clock pulses? Q1 Q3 Q3 Q4 How many clock pulses will it take for the shift register to return to reading a 0, 0, 0, 0 output from the shift register?arrow_forward
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