Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 60, Problem 7SQ
To determine
Choose the option that does not represent the cause for the problem that exists in the motor.
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If 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 shaftdamage
question 7:
If the timer is set for 10 seconds when will motor 2 start?
a
10 seconds after the start button is pushed
b
10 seconds after the control relay closes
c
10 seconds after motor 1 starts
d
Instantly when the start button is pushed
Explain (i) control relay and (ii) Thermal overload relay?
please dont copy
Chapter 60 Solutions
Electric Motor Control
Ch. 60 - What are the three main electrical test...Ch. 60 - What is the advantage of a plunger-type voltage...Ch. 60 - A motor is tripping out on overload. The motor...Ch. 60 - A motor is tripping out on overload. The motor...Ch. 60 - Refer to the circuit shown in Figure 6016. The...Ch. 60 - Refer to the circuit shown in Figure 6016. Assume...Ch. 60 - Prob. 7SQCh. 60 - Prob. 8SQCh. 60 - Refer to the circuit shown in Figure 6016. If a...Ch. 60 - Prob. 10SQ
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- Refer to the circuit shown in Figure 105. Assume that the motor is running and an overload occurs, which causes the OL contact to open and disconnect coil M to stop the motor. What effect does the opening of the overload contact have on the pressure switch circuit?arrow_forwardRefer 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_forwardSelect the best answer for each of the following. When the reset button does not reestablish the control circuit after an overload, the probable cause is a. the overload heater is too small. b. the overload trip has not cooled sufficiently. c. the auxiliary contacts are defective. d. the overload heater is burned out.arrow_forward
- How many poles are required on motor starters for the following motors:(a)240-volt, single-phase induction motor,(b)440-volt, three-phase induction motor?arrow_forwardSelect the best answer for each of the following. If an operator pushes a start button on a three-phase induction motor and the motor starts to hum, but not run, the probable trouble is a. one fuse is blown and the motor is single phasing. b. the overload trip needs resetting. c. the auxiliary contact is shorted. d. one phase is grounded.arrow_forwardThe disconnecting means for a motor controller shall be designed so that it does not _______ automatically per NEC 430.103 A. Open B. Close C. Restart D. Shutdownarrow_forward
- For the Starting Up the Power Station Simulator Why are certain operations blocked by isolatorsarrow_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 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.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.arrow_forward
- 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.(EKTS )arrow_forwardQUESTION 3: Assume all timers are set for 3 seconds. When the start button is pressed, all three motors start normally with a 3-second delay between the starting of each motor. When the stop button is pressed, motor #3 stops operating immediately. After a delay of 3 seconds, both motors #2 and #1 stop operating at the same time. Which of the following could cause this problem? Timer TR1 is defective Timer TR2 is defective Timer TR3 is defective Timer TR4 is defectivearrow_forward
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