Understanding Motor Controls
4th Edition
ISBN: 9781337798686
Author: Stephen L. Herman
Publisher: Delmar Cengage Learning
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Chapter 31, Problem 11RQ
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The cause of the problem.
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The forward and return strokes of the cylinder are to be controlled by separate push buttons. The speed of forward and return strokes is to be slow and separately adjustable. The cylinder diameter is 50mm and it has a 160mm. Draw the circuit diagram of this problem with completecomponent and port designation.
(B) Choose the correct answer for the following statements:-
1- For a faster response time, a spool type of directional control valve use
a-Over lapping, b-Zero lapping, c- Under lapping, d- Non of them
Design 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.
Chapter 31 Solutions
Understanding Motor Controls
Ch. 31 - Prob. 1RQCh. 31 - Prob. 2RQCh. 31 - A wound rotor induction motor has a stator that...Ch. 31 - Name three factors that determine the amount of...Ch. 31 - Prob. 5RQCh. 31 - Explain why controlling the rotor current also...Ch. 31 - What is the function of a micro limit switch when...Ch. 31 - Prob. 8RQCh. 31 - What is rotor slip?
Ch. 31 - Prob. 10RQ
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- Refer 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_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_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_forward
- The piston rod of a double-acting cylinder is to advance when a 3/2- way push button valve is actuated manually. The cylinder is to remain advanced until a second valve is actuated. The signal of the second valve can only take effect after the first valve has been released. The cylinder is to then return to the initial position. The cylinder is to remain in the initial position until a new start signal is given. The speed of the cylinder is to be adjustable in both directions.Draw the circuit diagram for the problem.arrow_forwardRefer 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_forwardIn relation to the circuit presented below, mark the alternative(s) that you consider correct. 1 To enable actuator A2 to advance, it is necessary to switch valve V2 to the leftmost position and ensure that valve V1 is in its initial (intermediate) position. 2 Switching valve V2 to the leftmost position allows actuator A2 to advance, but for this to happen, valve V1 must also be switched to the leftmost position. 3 When activating valve V1, using the locking lever installed on the left side of it, the two actuators (A1 and A2) are allowed to advance. 4 Hydraulic pump B1 is a simple variable displacement type. 5 Valves V1 and V2 have a TANDEM center.arrow_forward
- For the circuit shown, give the sequence of operation of cylinders 1 and 2 when the pump is turned on. Assume both cylinders are initially fully retracted. CYLINDER 1 CYLINDER 2 Cylinder 1 extends, cylinder 2 extends. Cylinder 1 retracts, cylinder 2 retracts. Cycle repeats. Cylinder 1 extends, cylinder 2 extends. Cylinder 1 retracts, cylinder 2 retracts. Cycle stops. Cylinder 2 extends, cylinder 1 extends. Cylinder 2 retracts, cylinder 1 retracts. Cycle repeats. O Cylinder 2 extends, cylinder 1 extends. Cylinder 2 retracts, cylinder 1 retracts. Cycle stops..arrow_forwardTo answer the following questions refer to the circuit shown in Figure 41–10. Assume that the third speed push button is pressed. Explain the sequence of operation for the circuit.arrow_forwardRefer to the circuit shown in Figure 4221. Assume that the THIRD SPEED push button is pressed. The motor starts in second speed, skipping first speed. After 5 seconds, the motor accelerates to third speed. Which of the following could cause this problem? a. S1 contactor coil is open. b. CR1 contactor coil is open. c. TRl timer coil is open. d. S1 load contacts are shorted.arrow_forward
- To answer the following questions refer to the circuit shown in Figure 4110. Assume that the third speed push button is pressed and the motor starts in its first or lowest speed. After a delay of 3 seconds, the motor accelerates to its second speed, but never accelerates to its highest or third speed. Which of the following could cause this problem? a. CR coil is open. b. Coil 2TR is open. c. Coil 1TR is open. d. Coil 1S is open.arrow_forwardHow to perform zero point reset?arrow_forwardExamine the circuit shown below and answer the following questions: 1. How is the cylinder 3A (towards the right) fundamentally different than cylinders 1A and 2A? 2. Describe 5 key features (ways, actuator, etc.) of the directional control valve 1V1. 3. Describe 5 key features of directional control valve 3V. 4. What type of device is 1V2? 5. Here's a close up of 1V2. Is it metering-in or metering-out? How do you know? 6. Empty triangle shapes appear in many places in this schematic. What do they represent? 1A 181 182 2A 282 3A 281 381 WWE 1V2 1V3 2V2 2V3 1V1 2V1 2Y1H svos H2Y2 3Y1 V 1V3 OV] OY1 211AM OZarrow_forward
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Understanding Motor ControlsMechanical EngineeringISBN:9781337798686Author:Stephen L. HermanPublisher:Delmar Cengage Learning
Understanding Motor Controls
Mechanical Engineering
ISBN:9781337798686
Author:Stephen L. Herman
Publisher:Delmar Cengage Learning