Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Textbook Question
Chapter 46, Problem 4SQ
What protection is available from excessive starting currents in the event the timing relays cut out the starting resistors too rapidly for the connected load?
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Chapter 46 Solutions
Electric Motor Control
Ch. 46 - Prob. 1SQCh. 46 - What physical characteristic distinguishes between...Ch. 46 - Prob. 3SQCh. 46 - What protection is available from excessive...Ch. 46 - How does a field accelerating relay prevent...Ch. 46 - Prob. 6SQCh. 46 - How may more steps of acceleration be added to a...Ch. 46 - Prob. 8SQ
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- Under what conditions will the out-of-step relay trip out the control circuit?arrow_forwardWhat is the purpose of a starting relay? to start an electric motor to remove the starting winding or component from the circuit to protect the motor from starting overloads to prevent the motor from starting under heavy loadsarrow_forwardSelect the best answer for each of the following. Thermal overload relays react to a. high ambient temperatures and excessive heating due to overload currents. b. heavy mechanical loads. c. heavy electrical loads. d. rising starting currents.arrow_forward
- 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 shaftdamagearrow_forwardWhat is the role of protective relays in ensuring the safety of power systems?arrow_forwardDesign a relay latching circuit with an emergency stop button, stopbutton, and start button. There shall be an indicator light when the coil is energized and another indicator light when the coil is not energized.arrow_forward
- Using the time limit overload or the dashpot overload relay, how are the following achieved: time-delay characteristics; tripping current adjustments?arrow_forwardExplain the operation and significance of protective relays in power systems. How do they help prevent faults and blackouts?arrow_forwardWhat is the purpose of the lockout relay or safety latch relay?arrow_forward
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