Understanding Motor Controls
4th Edition
ISBN: 9781337798686
Author: Stephen L. Herman
Publisher: Delmar Cengage Learning
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Question
Chapter 26, Problem 6RQ
To determine
The purpose of the normally closed 2M and S contacts in the circuit shown in Figure 26-9.
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Chapter 26 Solutions
Understanding Motor Controls
Ch. 26 - Name two requirements that must be met before a...Ch. 26 - Prob. 2RQCh. 26 - Prob. 3RQCh. 26 - Refer to the circuit shown in Figure 26–9. Assume...Ch. 26 - Refer to the circuit shown in Figure 269. Assume...Ch. 26 - Prob. 6RQCh. 26 - The motor nameplate of a wye-delta started motor...Ch. 26 - Prob. 8RQCh. 26 - Refer to the circuit shown in Figure 2614. What is...Ch. 26 - Refer to the circuit shown in Figure 2614. When...
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- Refer 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_forwardRefer 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 transformer shown in Figure 5-13 to answer the following questions. What is the turns ratio of the winding between points B and E as compared to the winding between points D and E? Figure 5-13 Autotransformer practice problems.arrow_forward
- Assume 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_forwardRefer to the circuit shown in Figure 336. What is the function of contactor 2L?arrow_forwardFollowing the procedure discussed in Chapter 7, place wire numbers on the schematic in Figure 8–7. Place corresponding wire numbers on the components shown in Figure 8–8.arrow_forward
- Refer to the circuit shown in Figure 3311. You are to construct this circuit on the job. Would it be possible to use an 11 pin control relay for 4CR?arrow_forwardRefer to the transformer shown in Figure 5-13 to answer the following questions. The transformer shown in Figure 5-13 is supplying 325 volt amperes to a load. The primary voltage is 240 volts. What is the primary current? Figure 5-13 Autotransformer practice problems.arrow_forwardA 480-volt three-phase load is rated at 34.5 kVA. It is to be supplied with variable three-phase voltage. Because the load is continuous, the transformers ratings are to be increased by 1.25% of the rated load. Three variable autotransformers are used to supply this load. Refer to Table 4-2 and determine the standard size of each transformer that should be used to make this connection.arrow_forward
- 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 the circuit shown in Figure 255. Explain the steps necessary for coil S2 to energize.arrow_forwardRefer to the transformer connection shown in Figure 8-31 to fill in the following values. Figure 8-31 Practice problems circuit 2arrow_forward
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