Understanding Motor Controls
4th Edition
ISBN: 9781337798686
Author: Stephen L. Herman
Publisher: Delmar Cengage Learning
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Textbook Question
Chapter 7, Problem 2RQ
Assume that when the START button is pressed M starter does not energize. List seven possible causes for this problem.
a. _____________
b. _____________
c. _____________
d. _____________
e. _____________
f. _____________
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Chapter 7 Solutions
Understanding Motor Controls
Ch. 7 - Refer to the circuit shown in Figure 7-10. If wire...Ch. 7 - Assume that when the START button is pressed M...Ch. 7 - Explain the difference between a motor starter and...Ch. 7 - Refer to the schematic in Figure 7-10. Assume that...Ch. 7 - Explain the difference between load and auxiliary...Ch. 7 - Prob. 6RQCh. 7 - In a schematic diagram, what does a dashed line...
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- Name two requirements that must be met before a motor can be used for wye-delta starting.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_forwardExplain the difference between manual motor starters that provide low voltage release and those that do not.arrow_forward
- The nameplate of a motor lists the frame as 256T. What is the distance from the base of the motor to the center of the shaft?arrow_forwardTrue or False: Three-phase motors have low starting torque.arrow_forwardTechnician A checks a starter’s field coils for opensby connecting an ohmmeter between the coils’power feed wire and the field coil brush lead. TechnicianB checks a starter’s field coil for a short toground by connecting an ohmmeter across the fieldcoil brush lead and the starter housing. Who iscorrect?a. Technician Ab. Technician Bc. Both A and Bd. Neither A nor Barrow_forward
- A normal shaft layout is based on the existing model as a starter Discuss a process to create a new shaft layout without existing model supporting with diagramarrow_forwardFor 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 U O Cylinder 2 extends, cylinder 1 extends. Cylinder 2 retracts, cylinder 1 retracts. Cycle stops.. O Cylinder 1 extends, cylinder 2 extends. Cylinder 1 retracts, cylinder 2 retracts. Cycle stops. O Cylinder 2 extends, cylinder 1 extends. Cylinder 2 retracts, cylinder 1 retracts. Cycle repeats. O Cylinder 1 extends, cylinder 2 extends. Cylinder 1 retracts, cylinder 2 retracts. Cycle repeats.arrow_forwardRefer to Figure 21–1 to answer the following questions. Assume that HOA SW 120 has been set in the auto position. List four ways by which coil CR-8 could be energized.arrow_forward
- 9.a. A chain-drive system can be aligned easier than a belt-drive system since the chain-drive systemA. can have the chain removed while the final alignment is taking place.B. can have a string left on the sprockets after the alignment is complete.C. is less critical to misalignment. 9.b. When you're first starting a PM program, and you want to check motor starter and contactor contacts,how often should you perform a PM inspection on these devices?A. Every two monthsB. Every monthC. Every six monthsarrow_forwardWhat is the speed of operation of the Warren motor?arrow_forwardWhich of the following is not part of the starter motorcircuit?a. Batteryb. Starting safety switchc. Starter motord. Relay solenoidarrow_forward
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