Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Textbook Question
Chapter 23, Problem 2SQ
In Part (A) of Figure 23–3, what will happen if both the run and jog push buttons are closed?
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we are interested in an automatic garage gate system for a building. This system includes a gate that goes up or down, a motor to actuate the gate (pull, push) and sensors to collect information (gate open contact, gate closed contact). The sensors are all similar, each signaling to its controller that a contact has taken place. The user has a remote control to control with just two buttons: open, close.
The operating principle of the system is as follows. Suppose the gate is closed. The user opens the gate by pressing the Open button on his remote control. He can stop opening by pressing the Open button again, the motor stops. Otherwise, the gate opens completely and triggers a Gate Open sensor which causes the motor to stop. Pressing the Close button causes the gate to close if it is open (partially or fully).
The closing can be stopped by pressing the Close button again, the motor stops. Otherwise, the gate closes completely and triggers a Gate Closed sensor which causes the engine…
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
Write the applications 5-5 each of toggle, push, limit, rotary, DIP, selector switch.
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, electrical-engineering and related others by exploring similar questions and additional content below.Similar questions
- In Figure 236, what will happen if both jog push buttons are pushed momentarily?arrow_forwardSelect the best answer for each of the following. A single-break control is a a. heavy-duty selector switch. b. single-circuit push button. c. standard-duty selector switch. d. double-circuit push button.arrow_forwardA washing machine is supplied with hot and cold water from two different supplies. Draw the bock the diagram of a process control that controls the hot water flow ?? and the cold water flow ?? to adjust the water temperature as the machine user specify? and define each block? Note: pressure controlled pneumatic actuator is used as a valve.arrow_forward
- What is the sequence of the operations if the limit switches, shown in Figure 216, are used. (Limit switches were covered in Unit 13.) Fig. 216 Elementary diagram of the reversing starter shown in Figure 211. The mechanical, push-button, and auxiliary contact interlocks are indicated.arrow_forwardA motor can be turned on when a momentarily pushbutton A or B is pressed.Another pushbutton C is used to turn off the motor. The motor is equipped withoverload relay. With the implementation of holding mechanism (SETRESET/KEEP), design a PLC program ladder diagram for this systemarrow_forwardGiven the below arduino code for a blinking LED: void setup() { int LED = 7 pinMode(LED,OUTPUT); } void loop() { digitalWrite(LED,HIGH); delay(500); digitalWrite(LED,LOW); delay(500); } Modify the code so that the LED is connected to pin 6 and the delay is one second between each blinking. What happened to the led speed blinking when the delay was changed?arrow_forward
- Devise ladder programs for systems that will carry out the following Internal Relay tasks: Start a machine if switch B is closed within 0.5 s of switch A being closed; otherwise the machine is not switched on.arrow_forwardIf two push buttons are wired both as a stop and each device needs equal control, how should they be wired?arrow_forwardMake a Wiring Diagram of Two – Station Start Stop Motor Control.arrow_forward
- A __________________________ starts or stops the flow of current by closing or opening the contacts of a control device.arrow_forwardThe disconnecting means for a motor controller shall be designed so that it does not _______ automatically per NEC 430.103 A. Open B. Close C. Restart D. Shutdownarrow_forwardWhat happens if the reverse push button is closed when the motor is running in the forward direction as in Figure 485?arrow_forward
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