Understanding Motor Controls
4th Edition
ISBN: 9781337798686
Author: Stephen L. Herman
Publisher: Delmar Cengage Learning
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Chapter 42, Problem 8RQ
Refer to the circuit shown in Figure 42–21. Assume that the THIRD SPEED push button is pressed. The motor starts in second speed, skipping first speed. After 5 seconds, the motor accelerates to third speed. Which of the following could cause this problem?
- a. S1 contactor coil is open.
- b. CR1 contactor coil is open.
- c. TRl timer coil is open.
- d. S1 load contacts are shorted.
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Chapter 42 Solutions
Understanding Motor Controls
Ch. 42 - What are the three main electrical test...Ch. 42 - What is the advantage of a plunger type voltage...Ch. 42 - A motor is tripping out on overload. The motor...Ch. 42 - A motor is tripping out on overload. The motor...Ch. 42 - Prob. 5RQCh. 42 - Refer to the circuit shown in Figure 42–17. Assume...Ch. 42 - Prob. 7RQCh. 42 - Refer to the circuit shown in Figure 4221. Assume...Ch. 42 - Prob. 9RQCh. 42 - Refer to the circuit shown in Figure 42–21. Assume...
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- Can you answer this question?arrow_forwardCan you answer this question?arrow_forwardA gear has a gear wheel with 16 teeth. The gear should be dimensioned for the highest and lowest gear ratio. Looking for output power, torque, speed?nin= 2000 rpmmin = 30Nmn=0,9a max= 450 mmModule 4Gear limitsz1 z213 13-1614 14-2615 15-4516 16-10117 17-131418 18-…..I have calculate but I can’t get the right answers…..√16 =459x60/56x57=1.1 lowest59x60/13x13=20,94 highestnut=2000/1.1= 1818rpmnut=2000/20.94=95.5 rpmMut=1.1x30=33 NmMut=20.94x30=628,2 Nm(Right answer)LowestZ=13, M=24,4Nm, n=2462 rpmHighestZ=92, M=172,5Nm, n=347,8 rpmP=5655W on botharrow_forward
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