Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 9, Problem 3SQ
How is a pneumatic timer adjusted?
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QUESTION 24
When an instantaneous contact is needed and the timing relay does not have one a control relay is wired in series with the timer.
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In your opinion and own understanding as a student, why is that timer switches are important to the industry?
Applications and advantages for Timer for Home Appliances in Peak Hours?
Chapter 9 Solutions
Electric Motor Control
Ch. 9 - List several applications for a motor-driven...Ch. 9 - Which timer is the most commonly used in...Ch. 9 - How is a pneumatic timer adjusted?Ch. 9 - List six factors to be considered when selecting a...Ch. 9 - List several additional factors that will affect...Ch. 9 - Prob. 6SQCh. 9 - Connect these components in Figure 917: a. The...Ch. 9 - Connect the following components in Figure 918: a....
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- Which timer is the most commonly used in industrial applications?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_forwardHow do you know when a pulse generator needs to be replaced?arrow_forward
- 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…arrow_forwardQUESTION 18 The instantaneous contacts of a timer are drawn in the same manner as standard relay contacts. True Falsearrow_forwardquieston 2: Assume all timers are set for 3 seconds. When the start button is pressed, motor #1 starts operating immediately. Motor #2 does NOT start operating after 3 seconds, but after a delay of 6 seconds, motor #3 starts operating. When the stop button is pressed, motors #3 and #1 stop operating immediately. Which of the following could cause this condition? a 2CR coil is open b TR1 coil is open c TR3 coil is open d 2M coil is openarrow_forward
- What is the purpose of the defrost cycle of a heat pump?arrow_forwardSelect the best answer for each of the following. When the reset button does not reestablish the control circuit after an overload, the probable cause is a. the overload heater is too small. b. the overload trip has not cooled sufficiently. c. the auxiliary contacts are defective. d. the overload heater is burned out.arrow_forwardWhat are some applications of temperature-actuated switches?arrow_forward
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