Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Textbook Question
Chapter 21, Problem 10SQ
In place of the push buttons in Figure 21–4, draw a heavy-duty selector switch for forward-reverse-stop control. Show the target table for this selector switch.
FIG. 21–4
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Chapter 21 Solutions
Electric Motor Control
Ch. 21 - How is a change in the direction of rotation of a...Ch. 21 - Prob. 2SQCh. 21 - If a reversing control circuit contains...Ch. 21 - How is auxiliary contact interlocking achieved on...Ch. 21 - After the forward coil has been energized, is the...Ch. 21 - If a mechanical interlock is the only means of...Ch. 21 - If pilot lights are to indicate which coil is...Ch. 21 - What is the sequence of the operations if the...Ch. 21 - In place of the push buttons in Figure 214, draw a...Ch. 21 - From the elementary drawing in Figure 2110,...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, electrical-engineering and related others by exploring similar questions and additional content below.Similar questions
- 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_forwardRefer 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_forwardWhat is the difference between a manual faceplate starter and a manual faceplate regulator?arrow_forward
- Industrial Motor Controls 8.a. A typical motor speed control circuit that is controlled by an analog current loop will have a current ofA. 4-20 mA.B. 2-20 mA.C. 5-50 mA.D. 0-10 mA.8.b. Which one of the following statements is true of a disabled contact or coil?A. The disabled element has been automatically disabled due to module failure.B. The disabled element is held false by the PLC.C. A disabled contact or coil is caused by a faulty memory location in the PLC.D. A contact must be in the disabled state before it can be forced ON or OFF.arrow_forwardAH ES 2arrow_forwardExplain how DOL magnetic starter works step by step with diagram and pictures.arrow_forward
- b) Determine the contactor and overload rating for DOL starter of the 93 kW three- phase squirrel cage motor with specification as per below: 415 volts, 50HZ, 1450rpm, 90% efficiency, 0.85 power factor, KVA code H (KVA/HP = 6.7) c) A relay is an electromagnetic switch that is used to turn on and turn off a circuit by a low power signal, or where several circuits must be controlled by one signal. With aid of illustration, describe the THREE (3) methods to verify the performance of a relay in an electrical circuit.arrow_forwardWhich of the following is a safety device in a motor control circuit. Select one: O a. selector switch O b. lamp O c. motor contactor O d. stop push button O e. thermal overload relay (TOR)arrow_forwardWhat is the principal difference between a contactor and a motor starter?arrow_forward
- Q1arrow_forwardAt standstill condition, the back emf is zero, so the motor can be safely turned ON without a starter. Select one: OTrue O Falsearrow_forwardTechnician A says when testing the voltage output, if the charging voltage is too high, the cause could be an open field wire from the regulator. Technician B says a loose or glazed drive belt could be the cause of too high charging voltage. Who is correct? A only B only Both A and B Neither A or B Technician A says that poor connection at the generator output wire can cause charging systems problems. Technician B says that many charging system circuits contain a circuit protection device. Who is correct? A only B only Both A and B Neither A or Barrow_forward
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