INDUSTRIAL MOTOR CONTROL
7th Edition
ISBN: 9780357670590
Author: Herman
Publisher: CENGAGE L
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Textbook Question
Chapter 54, Problem 4RQ
Why is the output I/O used to energize a motor starter instead of energizing the motor directly?
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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.
Chapter 54 Solutions
INDUSTRIAL MOTOR CONTROL
Ch. 54 - Why are NEMA symbols representing such components...Ch. 54 - Explain how to program an internal relay into the...Ch. 54 - Why are the contacts used to represent stop...Ch. 54 - Why is the output I/O used to energize a motor...Ch. 54 - Prob. 5RQCh. 54 - When programming in Boolean, what command is used...Ch. 54 - When programming in Boolean, what command is used...Ch. 54 - When programming in Boolean, what command is used...Ch. 54 - Why are the numbers 8 and 9 not used in an OCTAL-...
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- What is the advantage of the capacitor-start induction-run motor over the resistance-start induction-run motor?arrow_forwardWhen energizing or de-energizing a combination starter what safety precaution should always be taken?arrow_forwardExplain the difference between a motor starter and a contactor.arrow_forward
- What is the minimum size IEC starter rated for the motor described in question 11?arrow_forwardWhat is the advantage of a capacitor start induction run motor over a resistance start induction run motor?arrow_forwardA 150-horsepower motor is to be installed on a 480-volt three-phase line. What is the minimum size NEMA starter that should be used for this installation?arrow_forward
- An open single-phase motor with a centrifugal starting switch may not be used in A. an air-conditioning condenser fan motor. B. an air-conditioning indoor air handler. C. an area where explosive gases exist. D. a ventilating fan motor.arrow_forwardWhat are the three types of armature windings?arrow_forward
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