Understanding Motor Controls
4th Edition
ISBN: 9781337798686
Author: Stephen L. Herman
Publisher: Delmar Cengage Learning
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Chapter 25, Problem 3RQ
To determine
Identify the three commonly used percentage taps connected to the voltage line to start a motor.
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What happens when the low-voltage current flow in the coil primary winding is interrupted by the switching device?
The primary winding delivers a high-voltage spark to the plugs.
The magnetic field in the coil primary builds.
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The supply frequency is 50 Hz. What will be
the rotor voltage frequency if the motor
speed is equal to 90% of synchronous
speed.
O 45 Hz.
O 10 Hz.
05 Hz.
O None.
Examine 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?
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Chapter 25 Solutions
Understanding Motor Controls
Ch. 25 - Prob. 1RQCh. 25 - Explain the differences between open and closed...Ch. 25 - Prob. 3RQCh. 25 - Refer to the circuit shown in Figure 252. Assume...Ch. 25 - Prob. 5RQCh. 25 - Prob. 6RQCh. 25 - Prob. 7RQCh. 25 - Refer to the circuit shown in Figure 255. Explain...Ch. 25 - Prob. 9RQCh. 25 - Refer to the circuit shown in Figure 25–5. Assume...
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- When a diac first turns on, does the voltage drop, remain at the same level, or increase to a higher level?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_forwardVoltage can be described as ____________ .arrow_forward
- Name two methods of sensing the current flow through the shunt field.arrow_forward4. Describe two type of starting system principles and draw the basic starting circuitarrow_forwardProblem Description Components are to be continuously stamped with a stamping device. After the start button is pressed, the die is pushed down and the component is stamped. The die is to return to initial position after five (5) seconds. The sequence stops automatically after five (5) cycles. Start button should reset the counter. Inductive sensors S1 and S2 are used to check the fully retracted and extended positions of the cylinder. Draw the following: Pneumatic circuit diagram Electrical circuit diagramarrow_forward
- Before energizing the motor of a drill press, always ensure that the: Chuck key is placed in the chuck B) Shank drill bit is placed in the spindle C Chuck key is removed from the chuck Shank drill bit is removed from the spindle 9050 0 6/32 ant is owned by affiiates of DuPont de Nemours, Inc and is licensed to DSS for a limited period of time. Privas MacBook Air >> 000 F10 80 F3 000 F4 F8 F9 F5 F6 F7 F2 23 % & * 3 4 5 6 7 R Y Uarrow_forward1. What will be the output voltage during the positive half cycle of the input voltage? 2. What will be the output voltage during the negative half cycle of the input voltage?arrow_forwardMatch the following terms with the definitions.Damping Bandwidth End point Home position Holding torque Traverse rate The desired location to which a load is moved The speed at which a load is moved from one location to another A measure of how quickly the actuator responds to the command signal Prevention of overshooting The force that causes the load to maintain a standstill position A reference point from which a load is measuredarrow_forward
- Give the name of the following graphic symbols or Draw the graphic symbol according to the following name 4.(a) variable displacement motor (b) Pressure reducing valve (c) Directional control valve for 4-way, 3-position, O type neutral conditions (d) check valvearrow_forwardRefer to the schematic in Figure 7-10. Assume that when the START button is pressed, the control transformer fuse blows. What is the most likely cause of this trouble? Figure 7-10 Numbers are placed beside all components.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_forward
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