Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 2, Problem 5SQ
To determine
Explain about the consequence when the heater element is not installed in a two-pole manual starter.
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Chapter 2 Solutions
Electric Motor Control
Ch. 2 - If the contacts on a manual starter cannot be...Ch. 2 - If the handle of an installed motor starter is in...Ch. 2 - How may an automatic operation be achieved when a...Ch. 2 - What does the term trip-free mean as it relates to...Ch. 2 - Prob. 5SQCh. 2 - Prob. 6SQCh. 2 - Prob. 7SQCh. 2 - Prob. 8SQCh. 2 - Select the best answer for each of the following....Ch. 2 - Select the best answer for each of the following....
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- Which of the following applies to an autotransformer starter with a five-pole starting contactor: open transition or closed transition? Locate in Figure 273.arrow_forwardIf the contacts on a manual starter cannot be closed immediately after a motor overload has tripped them open, what is the probable reason?arrow_forwardRefer to the first Practical Application in this set. When the 50-HP motor replaces the 30-HP motor, the overload heaters will have to be changed. Using the chart in Figure 34-8, what size overload heaters should be used to protect the 50-HP motor?arrow_forward
- The starter must never operate for more than sixty seconds at a time and should rest for two minutes between extended cranking ? True or falsearrow_forwardA 460VAC rated, 60 Hz, 125-Hp Three-phase induction type motor is to be connected for across-the-line starting. The nameplate indicates the motor’s maximum ampere rating, 160A. It has a NEMA code letter B. The ambient temp of the installation place is and TW copper will be used. Short-circuit protection device that will be used is Inverse Time Breaker. Calculate the Motor Starter Size.arrow_forwardA starter turns very slowly and has excessive cranking current draw. When removed from the vehicle and bench tested, the starter spins normally and current draw is within specifications. Technician A says poor battery connections may be the cause. Technician B says an internal engine problem may be the cause. Who is correct?arrow_forward
- Your Answers may be presented through Discussions, Drawings/Figures/Diagrams, Reference to NEC/PEC and Computations What is the rated full-load current of a ¾-horsepower, 208-volt single-phase motorarrow_forwardDraw an electrical diagram for a Star Delta starter with a forward rotation and reverse rotation switch.arrow_forwardA squirrel-cage induction motor has a nameplate full-load current of 78 amperes and a marked temperature rise of 30C. The motor requires a NEMA size 4 starter. Using the overload heater chart in Figure 34-8, what size overload heaters should be used to protect this motor?arrow_forward
- At standstill condition, the back emf is zero, so the motor can be safely turned ON without a starter. Select one: OTrue O Falsearrow_forwardIf both the forward and reverse contactors for a motor engage at the same time, what will happen to the motor? What should be installed to prevent this?arrow_forwardAssume the fan motor is equipped with a thermal cutout designed to interrupt the motor circuit ifthe motor current becomes excessive. Would you expect the thermalcutout to operate? Explain.arrow_forward
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