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MindTap for Herman's Understanding Motor Controls, 4th Edition [Instant Access], 2 terms
4th Edition
ISBN: 9781337798754
Author: Herman; Stephen L.
Publisher: Cengage Learning US
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Chapter 8, Problem 3RQ
The two STOP push buttons in Figure 8–2 are connected in series with each other. What would be the action of the circuit if they were to be connected in parallel as shown in Figure 8–6?
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The reversing motor,which is controlled by two power relays,can be rotated in both directions as shown in the figure beiow.When the motor is mechanically combined with a lead screw,the rotary motion is converted to a linear one,such as the one moving lef tor right on the worktable in the layout.The desired direction of rotation is selected via the two STAFIT buttons,respectively.The limit switches LS1 and LS2,located at the two extreme motion limits,ensure 1-rqtf we forget to stop the movement of the worktable,then it will stop automatically, and the mechanism of the layout will not be destroyed.Draw the circuit of automation.
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1. In the drilling process shown in Figure 1, there are three cylinders in
which cylinders A and B are used to clamp the work piece and Drill
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operation is as follows: activate the direction control valve to start the
process, Cylinder A and Cylinder B clamps the workpiece and then
activate the second directional control valve to drill cylinder lowers
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sensors
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Figure 1: Drilling Process
а)
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Chapter 8 Solutions
MindTap for Herman's Understanding Motor Controls, 4th Edition [Instant Access], 2 terms
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- Refer to the circuit shown in Figure 15-6. The STOP button is shown to be an emergency STOP button. What does the symbol used for the STOP button actually represent?arrow_forwardThis is the problem number 2 and answer the question 3 thank youarrow_forwardRefer to the circuit shown in Figure 16-11. Assume that the platform is located on the lower floor. When the UP push button is pressed, the platform rises. When the platform reaches the upper floor, however, the pump does not turn off but continues to run until the overload relay opens the overload contacts. Which of the following could cause this problem? a. The solenoid valve opened when limit switch LS1 opened. b. The UP push button is shorted. c. Limit switch LS1 did not open its contacts. d. Limit switch LS2 contacts did not reclose when the platform began to rise.arrow_forward
- The roller track is to be swiveled by means of a double-acting cylinder. The signals to extend and to retract are given from separate push buttons. The cylinder is to remain in the position indicated by the last signal until an opposing signal is given. Draw the pneumatic circuit diagram using ISO symbols and connecting the ports with solid lines. (The positional sketch is the attached picture)arrow_forwardRefer to the schematic diagram in Figure 318. Assume that the motor is not running. When the third speed push button is pressed, the motor starts in its lowest speed. After a delay of 3 seconds, the motor accelerates to second speed and 3 seconds later to third speed. After a period of about 1 minute, the fourth speed push button is pressed, but the motor does not accelerate to fourth speed. Which of the following could cause this problem? a. Control relay CR2 coil is open. b. S2 contactor coil is open. c. CR3 coil is shorted. d. S3 contactor coil is open.arrow_forwardIn the drilling process shown in Figure 2, there are three cylinders in which cylinders A and B are used to clamp the work piece and Drill cylinder is used to lower and raise the drill. The sequence of operation is as follows: Start push button is used to start the process, Cylinder A and Cylinder B clamps the workpiece simultaneously and then drill cylinder lowers the drill and raises afterwards. Once the drill is raised, cylinder A and cylinder B retracts simultaneously. sensors Drill-high Drill Drill-Low Part / Material Cylinder A Cylinder B B+ sensors B Figure 2: Drilling Process For the above given drilling process: a) Provide the allocation List for the given application. b) Draw the grafcet and extract the grafcet equation. Obtain the ladder program from the grafcet equations.arrow_forward
- Refer to Figure 4-79 to answer the following questions. Find all the missing values. Figure 4-79 practice problems 1 through 6.arrow_forwardRefer to the circuit shown in Figure 25–5. Assume that timer TR1 is set for a delay of 10 seconds and timer TR2 is set for a delay of 5 seconds. When the START button is pressed, the motor starts. After 10 seconds the S1 contacts open and the motor continues to accelerate, but never reaches full speed. After a delay of about 30 seconds, the motor trips out on overload. Which of the following could cause this problem? TR1 coil is open. S2 coil is open. S1 coil is open. R coil is open.arrow_forwardRefer to the figure below. Read the feature control frame in the figure and write it out below. 0.010MABMCMarrow_forward
- Draw the P-V and T-S diagramsarrow_forwardDesign the circuit (pneumatic/hydraulic/electro-pneumatic/electro-hydraulic) for the following problems:1.A double acting cylinder of pneumatic system will extend when two pushbuttons are pressed. The retraction is doneautomatically when either one of the pushbuttons is released.2A pushbutton is required to extend a cylinder of a pneumatic stamping machine. Once the cylinder at the full extensionposition, it will wait for 5 seconds before it is automatically retracted.3.The cylinder extends when two pushbuttons are pressed. The cylinder retracts when the set pressure of 5 bar is achieved.4.Given a hydraulic system with double acting cylinder. The cylinder extends when the lever is triggered. The retraction of thecylinder is achieved by another lever.arrow_forwardRefer to the circuit shown in Figure 7-10. If wire number 11 were disconnected at the normally open auxiliary M contact, how would the circuit operate? Figure 7-10 Numbers are placed beside all components.arrow_forward
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