Industrial Motor Control
7th Edition
ISBN: 9781133691808
Author: Stephen Herman
Publisher: Cengage Learning
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Chapter 29, Problem 5RQ
To determine
The way in which the circuit would operate if the normally closed auxiliary contacts are connected in a way that the F contacts are connected in series with the F coil and the R contact connected in the series with the R coil.
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- Referring to the schematic shown in Figure 97, how would the circuit operate if the normally closed R contact connected in series with F coil were to be connected normally open?arrow_forwardRefer to Figure 211 to answer the following questions. How much voltage will be applied to coil 1CR when it is energized?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_forward
- Refer to the circuit shown in Figure 2614. When the START button is pressed, the control transformer fuse blows immediately. Which of the following could not cause this problem? a. Control relay coil CR is shorted. b. Starter coil 1M is shorted. c. Contactor coil S is shorted. d. Contactor coil 2M is shorted.arrow_forwardAssume that the circuit shown in Figure 97 were to be connected as shown in Figure 914. In what way would the operation of the circuit be different, if at all?arrow_forwardHow many transformers are needed to make an open-delta connection?arrow_forward
- Name three factors that determine the amount of induced voltage.arrow_forwardRefer to the circuit shown in Figure 97. Assume that when the forward push button is pressed the motor does not start, but when the reverse push button is pressed the motor will start in the reverse direction. When the stop button is pressed the motor stops running. Which of the following could NOT cause this problem? a. The forward push button is defective. b. The F starter coil is open. c. The overload auxiliary contact is open. d. The normally closed R contact is open.arrow_forwardA large motor has a full load current rating of 425 amperes. Current transformers with a ratio of 600:5 are used to reduce the current to the overload heaters. What should be the full load current rating of the overload heaters?arrow_forward
- Refer to the circuit shown in Figure 5-29. In this circuit, the HR contactor is equipped with five contacts. Three are load contacts and two are auxiliary contacts. From looking at the schematic diagram, how is it possible to identify which contacts are the load contacts and which are the auxiliary contacts? Figure 5-29 The contactor contains both load and auxiliary contacts.arrow_forwardRefer to the circuit shown in Figure 33–7. When the low speed push button is pressed, the motor begins to run in low speed. When the high speed push button is pressed, the motor stops running. Which of the following could cause this problem? The 1L contactor coil is open. H contactor coil is open. PR relay coil is open. The 2L contactor coil is open.arrow_forwardIs the resistance in the start winding greater or less than the resistance in the run winding?arrow_forward
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