Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 48, Problem 5SQ
To determine
Explain the effect if the contacts of zero-speed switch are adjusted to open very late.
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Chapter 48 Solutions
Electric Motor Control
Ch. 48 - In Figure 482, what is the purpose of normally...Ch. 48 - Can a time-delay relay be used satisfactorily in a...Ch. 48 - Prob. 3SQCh. 48 - Prob. 4SQCh. 48 - Prob. 5SQCh. 48 - What is the purpose of the lockout relay or safety...Ch. 48 - What happens if the reverse push button is closed...Ch. 48 - Prob. 8SQCh. 48 - Prob. 9SQCh. 48 - In Figure 487, is it necessary to push the stop...
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- Why is the reason of connecting in series a normally open contact of an overload relay and an indicator lamp for fault condition?arrow_forwardWhat is the purpose of the N/O contact in parallel with the start button in the magnetic start control circuit ..arrow_forwardWhat safely feature does the conbination starter provide that individual motor starting assemblies do not?arrow_forward
- 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_forwardDescribe how pressure switches are connected to start and stop (a) small motors and (b) large motors.arrow_forwardExplain by drawing how intermediate switch is working in ON and OFF position.arrow_forward
- Advance Motor Control 1. Why are contacts often disconnected in series when controlling small motors 2. Why are clapper type contactors generally used to control DC device 3. What is the purpose of FCR (field current relay)arrow_forward13.a. A control system that doesn’t return position or velocity information from the motor back to the controlsystem is called a/anA. differential system.B. translated position system.C. directional system.D. open-loop system.13.b. You’re looking at a tachometer feedback signal on an oscilloscope. The waveform takes a long time togo to zero volts. This means that the system isA. critically dampened.B. at high speed.C. reversing direction.D. overdampened.arrow_forwardASAP pleasearrow_forward
- 6.a. Arcing in manual starters is eliminated by the use ofA. overload relays.B. nonconductive contacts.C. blowout coils.D. spring-loaded handles.6.b. Chattering of AC contactors is prevented byA. blowout coils.B. air gaps.C. secondary windings.D. shading poles.arrow_forwardWhat is the last control contact that closes on a starting and synchronizing operation?arrow_forwardA selector switch Andrés two- aire piloto debiese cannot be used to comtrol a larger motor directly but rather must be connected to the magnetic starter. Why this is true?arrow_forward
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