Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Textbook Question
Chapter 21, Problem 8SQ
What is the sequence of the operations if the limit switches, shown in Figure 21–6, are used. (Limit switches were covered in Unit 13.)
Fig. 21–6 Elementary diagram of the reversing starter shown in Figure 21–1. The
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Q.11
A normally open auxiliary contact connected in parallel to maintain a circuit to the relay coil when the push button is released is part of what type of control circuit?
Select one:
A. START-STOP PUSH BUTTON
B. JOGGING SWITCH
C. STARTING SWITCH
D. EMERGENCY STOP BUTTON
7. Which statement is true for the process-control relay ladder diagram shown in the figure?
A. The pressure switch, temperature switch, and push button must be closed for the motor to start.
B. With the temperature switch closed, the motor will start once the push button is pressed.
C. With the pressure switch closed and the push button released, the motor will start.
D. Only the temperature switch has to close for the motor to start.
2. In the motor control circuit of Figure 11 in your study unit, the operation of any one of the overload relays has which of the following effects?A. The motor only runs two phases.B. The motor operates normally. C. The auxiliary contact M closes. D. The motor stops
Chapter 21 Solutions
Electric Motor Control
Ch. 21 - How is a change in the direction of rotation of a...Ch. 21 - Prob. 2SQCh. 21 - If a reversing control circuit contains...Ch. 21 - How is auxiliary contact interlocking achieved on...Ch. 21 - After the forward coil has been energized, is the...Ch. 21 - If a mechanical interlock is the only means of...Ch. 21 - If pilot lights are to indicate which coil is...Ch. 21 - What is the sequence of the operations if the...Ch. 21 - In place of the push buttons in Figure 214, draw a...Ch. 21 - From the elementary drawing in Figure 2110,...
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Convert the control circuit only, Figure 2111, from the wiring diagram to an elementary diagram. Include the limit switches (RLS, FLS) as operating in the control circuit.
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Draw an schematic control diagram of a reversing starter. Use a standard-duty selector switch with forward, reverse, and stop push buttons with three methods of interlocking.
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Make a Wiring Diagram of Two – Station Start Stop Motor Control.
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A technician reads 24 Volts to a relay coil that is rated 24V, 120 Volts to the input terminal of the relay contacts, but 0 volts to the other side of the relay contacts, which of the following could be the problem
A. A bad set of contacts
B. A bad thermostat
C. A bad high pressure safety switch
D. A bad fan motor
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If the nameplate of a dual-voltage motor connected to a part winding starter reads 15/30 amperes, which amperage value is used as the basis for the selection of the overload heating elements?
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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
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- Switching, Cords and Cables, Motors, and Related Systems
15.a. Information such as manufacturer's name or identification, rated voltage, rated current or HP, and shortcircuit current rating, along with any other information necessary to indicate their suitable application,should be found marked on what part of a motor circuit?A. The controllerB. The overload protectorC. The power source
15.b. What condition must be met to permit the attachment plug and receptacle or cord connector to act asthe disconnect for an A/C?A. The unit is 1 φ and not over 250 V.B. The unit is 5 φ and not over 300 V.C. The unit is 20 φ and not over 100 V.D. The unit is 10 φ and not over 200 V.
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After the forward coil has been energized, is the auxiliary forward interlocking contact open or closed?
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A 3-phase, 15 HP, 230/460-volt motor has a nameplate FLA = 38/19. If operated at 230 volts, ___ amps of current would flow in each motor winding.
Please answer in typing format please ASAP for the like
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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.
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If pilot lights are to indicate which coil is energized, where should they be connected? Additional auxiliary contacts are not to be used.
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If a motor starter is installed according to directions but will not start, what is a common cause for the failure to start?
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