Understanding Motor Controls
4th Edition
ISBN: 9781337798686
Author: Stephen L. Herman
Publisher: Delmar Cengage Learning
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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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Understanding Motor Controls
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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_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_forwardThe 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_forward
- Refer 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_forwardcan you write the angles and loops for the first mechanism like they did in the second onearrow_forwardShow Circuit diagram of the problem and quantity of each part used.arrow_forward
- Refer 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 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_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_forward
- Refer to the circuit shown in Figure 16-11. Assume that the platform is located on the bottom floor. When the UP push button is pressed the pump motor does not start. Which of the following could not cause this problem? The contacts of limit switch LS1 are open. The contacts of limit switch LS2 are open. Motor starter coil M is open. The overload contact is open.arrow_forwardPlease helparrow_forwardRefer to the circuit shown in Figure 109. In this circuit the jog push button has again been connected incorrectly. The normally closed section of the button has been connected in series with the normally open run push button and the normally open section of the jog button is connecting in parallel with the holding contacts. Explain how this circuit operates.arrow_forward
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