Industrial Motor Control
7th Edition
ISBN: 9781133691808
Author: Stephen Herman
Publisher: Cengage Learning
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Textbook Question
Chapter 27, Problem 2RQ
Refer to the circuit shown in Figure 27–2. Would the temperature have to increase or decrease to permit the fan to turn on?
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14-26. For the circuit of Figure 14-20, what happens to the cylinders in each case?
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Industrial Motor Control
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- Refer to the circuit shown in Figure 15-6. If an overload should occur on the compressor motor and the overload contact open, would it affect the operation of the lube oil pump?arrow_forwardRefer to the circuit shown in Figure 15-6. If the circuit is in operation and an overload should occur on the lube oil pump and the overload contact open, would it affect the operation of the compressor?arrow_forwardRefer to the circuit shown in Figure 16-11. Assume that the platform is located on the lower floor. When the UP push button is pressed, the platform rises. When the platform reaches the upper floor, however, the pump does not turn off but continues to run until the overload relay opens the overload contacts. Which of the following could cause this problem? a. The solenoid valve opened when limit switch LS1 opened. b. The UP push button is shorted. c. Limit switch LS1 did not open its contacts. d. Limit switch LS2 contacts did not reclose when the platform began to rise.arrow_forward
- Sketch the following systems: one pipe, two-pipe direct return, and two-pipe reverse return.arrow_forwardRefer to the schematic in Figure 7-10. Assume that when the START button is pressed, the control transformer fuse blows. What is the most likely cause of this trouble? Figure 7-10 Numbers are placed beside all components.arrow_forwardTo answer the following questions refer to the circuit in Figure 416. The pressure switch is shown as: a. Normally open b. Normally closed c. Normally open held closed d. Normally closed held openarrow_forward
- To answer the following questions refer to the circuit shown in Figure 41–10. Assume that the third speed push button is pressed. Explain the sequence of operation for the circuit.arrow_forwardTo answer the following questions refer to the circuit in Figure 416. What is the purpose of the rotary switch connected after the pressure switch?arrow_forwardList two methods of performing the operation described in the previous question.arrow_forward
- To answer the following questions refer to the circuit shown in Figure 4110. Assume that the third speed push button is pressed and the motor starts in its first or lowest speed. After a delay of 3 seconds, the motor accelerates to its second speed, but never accelerates to its highest or third speed. Which of the following could cause this problem? a. CR coil is open. b. Coil 2TR is open. c. Coil 1TR is open. d. Coil 1S is open.arrow_forwardA three-phase motor nameplate indicates a full load current of 362 amperes. The nameplate indicates that the heaters are to be sized for 125% of motor full load current. Current transformers with a ratio of 600:5 are used to reduce the motor current. Using the chart shown in Figure 4–7B, determine the size of overload heaters needed to protect this motor.arrow_forwardRefer to the circuit shown in Figure 7-10. If wire number 11 were disconnected at the normally open auxiliary M contact, how would the circuit operate? Figure 7-10 Numbers are placed beside all components.arrow_forward
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