Understanding Motor Controls
4th Edition
ISBN: 9781337798686
Author: Stephen L. Herman
Publisher: Delmar Cengage Learning
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Chapter 53, Problem 5RQ
To determine
The change that happens to the output and discharge pins of the 555 timer.
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Understanding Motor Controls
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- Refer to the circuit shown in Figure 2614. What is the purpose of timer TR2?arrow_forwardRefer to the circuit shown in Figure 26–9. Assume that timer TR is set for a delay of 10 seconds. When the START button is pressed, the motor starts with its windings connected in wye. After a period of 1 minute, the motor has not changed from wye to delta. Which of the following could cause this condition? TR timer coil is open. S contactor coil is open. 1M starter coil is open. The control transformer fuse is blown.arrow_forwardIs timer TR an on-delay or off-delay timer?arrow_forward
- Refer to the circuit shown in Figure 42–21. Assume that a fused jumper is connected across terminals 1 and 3 of TR2 timer. What would happen if the jumper were left in place and the FIRST SPEED push button pressed? The motor would start in its lowest speed and progress to second speed, but never increase to third speed. The motor would start operating immediately in third speed. The motor would not start. The motor would start in second speed and then increase to third speed.arrow_forwardRefer to the circuit shown in Figure 269. Assume that timer TR is set for a delay of 10 seconds. When the START button is pressed, the motor does not start. After a delay of 10 seconds, the motor suddenly starts with its stator windings connected in delta. Which of the following could cause this problem? a. TR timer coil is open. b. 2M contactor coil is open. c. S contactor coil is open. d. 1M starter coil is open.arrow_forwardIf dual-element time-delay fuses are to be used as the short-circuit protective device, what size fuses should be used to protect the circuit in question #12?arrow_forward
- What are the two basic classifications of timers?arrow_forwardRefer to the circuit shown in Figure 247. Assume that all timers are set for a delay of 5 seconds. When the START button is pressed the motor starts in its lowest speed. After a delay of over 10 seconds, the motor is still running in the lowest speed. Which of the following could cause the problem? a. TR1 coil is open. b. TR1 coil is shorted. c. S2 coil is open. d. S1 coil is shorted.arrow_forwardWhy are NEMA symbols such as push buttons, float switches, or limit switches not used in programmable logic controller schematics?arrow_forward
- QUESTION 25 Pneumatic timers use a diaphragm and operate on the principle of air displacement. True Falsearrow_forwardDraw a series circuit with a thermostat,a low-pressure switch, and a highpressure switch used as safety controlsto protect a motorarrow_forwardExplain Automatic Door Open Close System PLC Ladder ?arrow_forward
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