Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Question
Chapter 23, Problem 5SQ
To determine
Use the selector switch with forward, reverse, and stop push buttons to draw an elementary control diagram of a reversing starter.
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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)
2. Assume that when the START button is pressed
M starter does not energize. List seven possible
causes for this problem.
Which 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)
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- In place of the push buttons in Figure 214, draw a heavy-duty selector switch for forward-reverse-stop control. Show the target table for this selector switch. FIG. 214 Mechanical interlock between the coils prevents the starter from closing all contacts simultaneously. Only one contactor can close at a time.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_forwardDraw an electrical diagram for a Star Delta starter with a forward rotation and reverse rotation switch.arrow_forward
- How may an automatic operation be achieved when a manual motor starter is used?arrow_forwardA selector switch and two - wire pilot device cannot be used to control a large motor directly but rather must be connected to a magnetic starter. Why this is true.?arrow_forwardCommon selector switches are?arrow_forward
- What would be the purpose of wiring two normally open start buttons in series rather than parallel?arrow_forwardWhen the high button is depressed in Figure 314, what prevents the high-speed starter from closing immediately?arrow_forwardThe figure below shows the closed loop position control block diagram of a spring mass damper system. Based on this figure , answer the following questions (13-21) 13. Block number 3 represents.. . function * ...transfer 6 20s+50 2 2s $2+8s+4 (4) (5) (1) (2) (3) 10 Position Sensor Controller Process O Actuatorarrow_forward
- Make a conventional wiring diagram to rotate a 3phase motor cw ccw with indicator lamps. When the motor rotates, a single acting cylinder extends? What happens if push buttons for cw and ccw are pressed at the same time?arrow_forwardWhat is the difference between a manual faceplate starter and a manual faceplate regulator?arrow_forwardWhat is the work of the Automatic transmission control system?arrow_forward
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