Understanding Motor Controls
4th Edition
ISBN: 9781337798686
Author: Stephen L. Herman
Publisher: Delmar Cengage Learning
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Chapter 53, Problem 3RQ
To determine
The Range of voltage operated on the 555 timer.
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Build a ladder logic diagram showing the timer delays.
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QUESTION 27
Pneumatic timers have better repeat accuracy that electronic timers.
True
False
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Understanding Motor Controls
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- Is timer TR an on-delay or off-delay timer?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_forwardWhat is the function of a watchdog timer?arrow_forward
- Refer to the circuit shown in Figure 25–5. Assume that timer TR1 is set for a delay of 10 seconds and timer TR2 is set for a delay of 5 seconds. When the START button is pressed, the motor starts. After 10 seconds the S1 contacts open and the motor continues to accelerate, but never reaches full speed. After a delay of about 30 seconds, the motor trips out on overload. Which of the following could cause this problem? TR1 coil is open. S2 coil is open. S1 coil is open. R coil is open.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_forwardTo answer the following questions refer to the circuit shown in Figure 4114. Temperature switch TS1 is shown as: a. Normally open b. Normally closed c. Normally open held closed d. Normally closed held openarrow_forward
- Refer 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_forwardWhat pin numbers are connected to the coil of an 8-pin control relay?arrow_forwardQUESTION 25 Pneumatic timers use a diaphragm and operate on the principle of air displacement. True Falsearrow_forward
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