Understanding Motor Controls
4th Edition
ISBN: 9781337798686
Author: Stephen L. Herman
Publisher: Delmar Cengage Learning
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Textbook Question
Chapter 15, Problem 5RQ
Refer to the circuit shown in Figure 15-6. If an overload should occur on the compressor motor and the overload contact open, would it affect the operation of the lube oil pump?
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14-26. For the circuit of Figure 14-20, what happens to the cylinders in each case?
a. Valve V1 is actuated and held.
b. Valve V1 is released and valve V2 is actuated and held. Valves V3 and V4 are
sequence valves.
Select the proper choice(s) for each of the following statements:
1) To control single-acting cylinder we just need:
double-acting cylinder we should use
A2/2-way, 5/2-way,
(C) 3/3-way, 3/4-way,
2) In
DCV.
(B) 3/2-way, 4/2-way,
(D) 4/3-way, 3/2-way.
mid poistion of DCV, we can move cylinder piston rod freely without
resistance by hand.
(A) working ports are exhausted,
(C) working ports are pressurized,
3) In pneumatics we use
A Compressor
(B) Pump,
DCV, while to control the
4) Quick exhaust valve is used to
(A) increase the cylinder return speed.
(C) meter-out the cylinder speed
(B) all ports are closed.
no one of these options.
to obtain high pressure air.
(C) Turbine,
(D) pressure relief valve.
(B) meter-in the cylinder speed,
(D) increase the cylinder extending speed.
6) Meter-in of cylinder movement is used to control the
Afluid that enters the hydraulic cylinder,
(B) fluid that exits the hydraulic cylinder,
(C) fluid that enters the DCV
(D) fluid that exits the DCV.
5) One of the…
Give the name of the following graphic
symbols or Draw the graphic symbol according to the
following name
4.(a) variable displacement motor
(b) Pressure reducing valve
(c) Directional control valve for 4-way, 3-position, O
type neutral conditions
(d) check valve
Chapter 15 Solutions
Understanding Motor Controls
Ch. 15 - What is the common name for an air flow switch?Ch. 15 - What type of switch is contained on most flow...Ch. 15 - Refer to the circuit shown in Figure 15-2. Why is...Ch. 15 - Refer to the circuit shown in Figure 15-6. The...Ch. 15 - Refer to the circuit shown in Figure 15-6. If an...Ch. 15 - Refer to the circuit shown in Figure 15-6. If the...Ch. 15 - Prob. 7RQ
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.Similar questions
- Refer to the circuit shown in Figure 15-2. Why is there an overload contact symbol shown in series with the compressor contactor but not the condenser fan contactor or evaporator fan contactor?arrow_forwardRefer to the circuit shown in Figure 16-11. Assume that the platform is located on the lower floor. When the UP push button is pressed, the platform rises. When the platform reaches the upper floor, however, the pump does not turn off but continues to run until the overload relay opens the overload contacts. Which of the following could cause this problem? a. The solenoid valve opened when limit switch LS1 opened. b. The UP push button is shorted. c. Limit switch LS1 did not open its contacts. d. Limit switch LS2 contacts did not reclose when the platform began to rise.arrow_forwardName two requirements that must be met before a motor can be used for wye-delta starting.arrow_forward
- What is meant by regulator creep?arrow_forwardRefer to the schematic in Figure 7-10. Assume that when the START button is pressed, the control transformer fuse blows. What is the most likely cause of this trouble? Figure 7-10 Numbers are placed beside all components.arrow_forwardExplain how to set the neutral plane position of the brushes by using the series field.arrow_forward
- Define the term in theory of macines Meyer's expansion valve.arrow_forwardA three-phase motor nameplate indicates a full load current of 362 amperes. The nameplate indicates that the heaters are to be sized for 125% of motor full load current. Current transformers with a ratio of 600:5 are used to reduce the motor current. Using the chart shown in Figure 4–7B, determine the size of overload heaters needed to protect this motor.arrow_forwardExplain the operation of an on-delay relay.arrow_forward
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