Understanding Motor Controls
3rd Edition
ISBN: 9781305498129
Author: Stephen L. Herman
Publisher: Cengage Learning
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Chapter 5, Problem 10RQ
What is the difference between a motor starter and a contactor?
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Chapter 5 Solutions
Understanding Motor Controls
Ch. 5 - Prob. 1RQCh. 5 - Prob. 2RQCh. 5 - Explain the difference between auxiliary contacts...Ch. 5 - Prob. 4RQCh. 5 - What is optoisolation and what is its main...Ch. 5 - What pin numbers are connected to the coil of an...Ch. 5 - An 11-pin control relay contains three sets of...Ch. 5 - What is the purpose of the shading coil?
Ch. 5 - Refer to the circuit shown in Figure 5-29. Is the...Ch. 5 - What is the difference between a motor starter and...
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- Explain the difference between a motor starter and a contactor.arrow_forwardWhat is the minimum size IEC starter rated for the motor described in question 11?arrow_forwardA push button manual starter has tripped on overload. Explain how to reset the starter so themotor can be restarted.arrow_forward
- What type of single-phase motor develops the highest starting torque?arrow_forwardWhat is the advantage of the capacitor-start induction-run motor over the resistance-start induction-run motor?arrow_forwardWhat is the advantage of a capacitor start induction run motor over a resistance start induction run motor?arrow_forward
- When energizing or de-energizing a combination starter what safety precaution should always be taken?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
- Question 5: Explain what happens if it is operated without a starting rheostat; What else is used instead of the starter rheostat and how is the speed adjustment done in D.C series motor? Explain.arrow_forwardWhat rating is used to find the full-load running current of a torque motor?arrow_forwardWhen a repulsion-start induction-run motor reaches about 75% of rated full-load speed, it stops operating as a repulsion motor and starts operating as a squirrel-cage motor. What must be done to cause the motor to begin operating as a squirrel-cage motor?arrow_forward
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