Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Question
Chapter 37, Problem 2SQ
To determine
Choose the correct option that causes the motor to run when the red warning lamp and alarm turn ON.
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A 3-phase, 15 HP, 230/460-volt motor has a nameplate FLA = 38/19. If operated at 230 volts, ___ amps of current would flow in each motor winding.
Please answer in typing format please ASAP for the like
1. Which NEC table is used to determine the full-load current of a torque motor?
2. What is the rated full-load current of a ¾-horsepower, 208-volt single-phase motor
3. What are the minimum allowable ampacities of the phase conductors and the neutral conductor that are to supply a 2-phase, 3-wire, 230-volt, 30-horsepower motor
4. . What is the full-load current of a 230-volt, 3-phase, 125-horsepower synchronous motor when it is operated at an 80% power factor?
A 10 hp single phase motor is connected to 240 volts. The motor nameplate indicates a NEMA code B, a full load running current of 47.5 amperes and a temperature rise of 40 degrees C. What size copper conductors with THWN insulation should be used to connect this motor?
Chapter 37 Solutions
Electric Motor Control
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- Refer to the basic control schematic in Figure 344. The limit switch is shown as a. normally open. b. normally closed. c. normally open held closed. d. normally closed held open. Fig. 344 Wiring diagram of manual speed regulator interlocked with magnetic starter for control of slip ring motor (three-wire control).arrow_forwardIf an electrical defect occurs in the electronic powersteering(EPS) system, __ .a. the system continues to operate normally, but theEPS warning light is illuminatedb. the system continues to operate with a slightlyreduced power-steering assistc. the EPS control unit shuts the system down byopening the fail-safe and power relaysd. the EPS control unit locks the armature in thesteering gear to prevent armature and screw shaftdamagearrow_forwardA belt-driven 202 Hp shunt wound DC generator is running at 465 rpm and issupplying full load to a bus bar at 232 V. At what speed will it run if the belt breaksand the machine continue to run taking 9 kW from the bus bar? The armature andthe field resistances are 0.05 Ohm and 100 Ohms respectively. The brush contactdrop is 2 Volts per brush.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_forwardAll answers should be written in complete sentences. Calculations should be shown in detail, and Codereferences should be cited when appropriate. Unless otherwise stated, all conductors are copper type THHN, and the supply is AC. 1.What is the full-load current of a 600-volt, 3-phase, 50-horsepower induction motor?arrow_forwardYour Answers may be presented through Discussions, Drawings/Figures/Diagrams, Reference to NEC/PEC and Computations 6. What are the minimum allowable ampacities of the phase conductors and the neutral conductor that are to supply a 2-phase, 3-wire, 230-volt, 30-horsepower motor?arrow_forward
- Refer 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_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_forwardCompletely solve and box/highlight/bold the final answers. WRITE LEGIBLY OR TYPEWRITE THE SOLUTIONS. A 60 kW, 230 volts shunt generator has an equivalent armature resistance of 0.3 ohms, and shunt field resistance of 60 ohms. Calculate: a. armature current and induce voltage b. generated power and total power lossarrow_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_forwardIdentify the dc motor used for Elevator with a neat sketch explain its workingarrow_forward- Switching, Cords and Cables, Motors, and Related Systems 15.a. Information such as manufacturer's name or identification, rated voltage, rated current or HP, and shortcircuit current rating, along with any other information necessary to indicate their suitable application,should be found marked on what part of a motor circuit?A. The controllerB. The overload protectorC. The power source 15.b. What condition must be met to permit the attachment plug and receptacle or cord connector to act asthe disconnect for an A/C?A. The unit is 1 φ and not over 250 V.B. The unit is 5 φ and not over 300 V.C. The unit is 20 φ and not over 100 V.D. The unit is 10 φ and not over 200 V.arrow_forward
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