Understanding Motor Controls
4th Edition
ISBN: 9781337798686
Author: Stephen L. Herman
Publisher: Delmar Cengage Learning
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Chapter 39, Problem 5RQ
To determine
Identify why the PLC output is used to energize the coil of the motor starter instead of the motor coil.
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I need help drawing an elementary diagram of a fractionalhorsepower, manual motor starter. When the starter contact is closed, itwill energize a pneumatic timing relay coil through the overload heater.After the timer coil is energized, the circuit will show a delayed closingcontact that energizes a small motor on 120 volts.
This is for my mechatronics class in regards to PLC and ladder diagrams
It is common practice to include a NC contact after the coil to prevent overloading and overheating of a device such as a motor.
True or False
1- What are the functions of accumulators?2- Draw the hydraulic symbols for a pressure –temperature compensated flow control valveand Bidirectional motor?
Chapter 39 Solutions
Understanding Motor Controls
Ch. 39 - Why are NEMA symbols such as push buttons, float...Ch. 39 - Prob. 2RQCh. 39 - Why are normally closed components such as STOP...Ch. 39 - Prob. 4RQCh. 39 - Prob. 5RQCh. 39 - List four basic rules for developing a program for...Ch. 39 - A PLC requires that times be programmed in...Ch. 39 - When programming in Boolean, what statement should...Ch. 39 - When programming in Boolean, what statement should...Ch. 39 - In a control circuit, it is imperative that a coil...
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- What device is used to program a PLC?arrow_forwardIn a control circuit, it is imperative that a coil energize before another one. How can this be done when entering a program into the memory of the PLC?arrow_forwardWhy are normally closed components such as STOP push buttons programmed normally open instead of normally closed when entering a program into the memory of a PLC?arrow_forward
- Explain the type of PLC, how it operates, the benefits and justification for using PLC within a hydraulic pressure test machine (used for pressure testing components)arrow_forwardExplain Automatic Door Open Close System PLC Ladder ?arrow_forwardWhat do you think is the most important component of the PLC? Explain why.arrow_forward
- What is the difference between a motor starter and a contactor?arrow_forwardRefer to the schematic diagram in Figure 318. Assume that the motor is not running. When the third speed push button is pressed, the motor starts in its lowest speed. After a delay of 3 seconds, the motor accelerates to second speed and 3 seconds later to third speed. After a period of about 1 minute, the fourth speed push button is pressed, but the motor does not accelerate to fourth speed. Which of the following could cause this problem? a. Control relay CR2 coil is open. b. S2 contactor coil is open. c. CR3 coil is shorted. d. S3 contactor coil is open.arrow_forwardA. Incident sound waves in a dynamic pickup or microphone lead to the passage of AF current in the coil because- 1) The coil's motion within a magnetic field. 2) The motion within an electrostatic field.3) A DC voltage is applied to the coil. 4) Changes in the capacitive reactance across the coil. B. An intermittent (as opposed to continuous) motor is one in which the shaft revolves in- 1) An incremental motor. 2) A stepper motor. 3) A selsyn. 4) A fractional motor.arrow_forward
- Why are SCRs used to construct a bridge rectifier in many solid-state variable frequency drives?arrow_forwardSelect 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…arrow_forwardWhat is the advantage of a capacitor start induction run motor over a resistance start induction run motor?arrow_forward
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