Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 50, Problem 9SQ
To determine
Draw a schematic diagram of a circuit to reverse the polarity of series filed for a compound motor.
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SOLVE CAREFULLY!! Please Write Clearly and Box the final Answer
Remember- Enter your answer to the 1st nearest decimal place. If rotation direction of the motor is reverse, use negative (-) sign.
A forward-reverse motor starter must be prevented from form reversing while running in the forward rotation. What is done?
a. install electrical limit switches
b. install electrical interlocking
c. install a NC stop button
d. install a NO pushbutton.
There are 2 1000Watt 3-phase asynchronous motors in a Walnut Cracking machine (it is desirable to operate the motors in a way that they remain in star connection). When the "Start" button is pressed, the 1st engine will start immediately, 3 seconds after the 1st engine starts, the 2nd engine will also start. After the two engines work together for 4 seconds, the 1st engine will stop, the 2nd engine will start and stop for 10 more seconds. If the "Stop" button is pressed at any stage of the operations, the motors will stop. The rotation directions of the motors are required to be opposite to each other. Draw the necessary power and control circuit.
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Electric Motor Control
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- There are 2 1000Watt 3-phase asynchronous motors in a Walnut Cracking machine (it is desirable to operate the motors in a way that they remain in star connection). When the "Start" button is pressed, the 1st engine will start immediately, 3 seconds after the 1st engine starts, the 2nd engine will also start. After the two engines work together for 4 seconds, the 1st engine will stop, the 2nd engine will start and stop for another 10 seconds. If the "Stop" button is pressed at any stage of the operations, the motors will stop. The rotation directions of the motors are required to be opposite to each other. Draw the necessary power and control circuit.arrow_forwardThere are 2 1000Watt 3-phase asynchronous motors in a Walnut Cracking machine (it is desirable to operate the motors in a way that they remain in star connection). When the "Start" button is pressed, the 1st engine will start immediately, 3 seconds after the 1st engine starts, the 2nd engine will also start. After the two engines work together for 4 seconds, the 1st engine will stop, the 2nd engine will start and stop for another 10 seconds. If the "Stop" button is pressed at any stage of the operations, the motors will stop. The rotation directions of the motors are required to be opposite to each other. Draw the necessary power and control circuit.(EKTS )arrow_forwardThere are 2 1000Watt 3-phase asynchronous motors in a Walnut Cracking machine (it is desirable to operate the motors in a way that they will remain in star connection). When the "Start" button is pressed, the 1st engine will start immediately, 3 seconds after the 1st engine starts, the 2nd engine will also start. After the two engines work together for 4 seconds, the 1st engine will stop, the 2nd engine will start and stop for 10 more seconds. If the "Stop" button is pressed at any stage of the operations, the motors will stop. The rotation directions of the motors are required to be opposite to each other. Draw the necessary power and control circuit. need : https://veppa.com/ekts/arrow_forward
- Large motor should be connected directly across the line on start up.arrow_forwardIn Figure 487, is it necessary to push the stop button when changing the direction of rotation? Explain your answer.arrow_forwardquestion 20: Do we need an add-on auxiliary contact on motor starter 2 to make this circuit work? a Yes b Noarrow_forward
- Refer to the circuit shown in Figure 105. If the pressure should become high enough for the pressure switch to close and stop the motor, is it possible to restart the motor before the pressure drops to a safe level?arrow_forwardYou’re powering up a new motor in a brushless motor control system. After moving the shaft of the motor lightly left to right, the motor reverses direction and runs away. What’s the problem? A. Power transistor failureB. Wrong motor typeC. Reversed tachometerD. Reversed hall-effect sensorarrow_forwardIf the full load current of a three-phase motor is 40 Amperes, the size of the circuit breaker is a. 100 AT c. 300AT b. 120 AT d. 80 AT A 50-hp, 440-volt, 3-phase, 1750 rpm, SCRIM, how many pair of poles a. 4 c. 3 b. 2 d. 1 The required rated voltage applied to a six leads out motor are a. 760-volts and 440-volts c. 440-volts and 254-volts b. 220-volts and 127-volts d. All of the abovearrow_forward
- Branch-circuit conductors supplying a single continuous-duty motor shall have an ampacity not less than _____ rating A. 125% of the motor’s nameplate current B. 125% of the motors full-load current as determined by 430.6(a)(1) C. 125% of the motor’s full locked-rotor D. 80% of the motors full-load current.arrow_forwardWhy would the slip not change? If you start the motor at 80% of the rated frequency, wouldn't that be 48 Hz?arrow_forwardInvestigate the faulty motor shown below to determine why doesn't the motor work?arrow_forward
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