Industrial Motor Control
7th Edition
ISBN: 9781133691808
Author: Stephen Herman
Publisher: Cengage Learning
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Question
Chapter 20, Problem 1RQ
To determine
The operation of the circuit 2 if contact M1 did not close.
Expert Solution & Answer
Explanation of Solution
Consider the contact M1 is not closed and the current do not flow through the auxiliary contact and to the motor starter, then to the relay coil TR1. Thus, the motor 1 do not operate and the timer delay coil TR1 is DE energized. Since, the de-energized coil fails to close the contact of the TR1 the motor 2 do not starts.
Consider that the motor M2 is in the off state so the timer delay coil TR2 is not energized and the contacts of the TR2 is closed so the motor M3 fails to operate.
Thus, the case when the contact M1 are open the three motors M1, M2 and M3 do not work.
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- Refer to the circuit shown in Figure 336. What is the function of contactor 2L?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_forwardRefer 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_forward
- Refer to the circuit shown in Figure 33–11. Explain the action of the circuit if coil 2CR is shorted and the second speed push button is pressed.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_forwardRefer to the circuit shown in Figure 255. Explain the steps necessary for coil S2 to energize.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 108. In this circuit, the jog button has been connected incorrectly. The normally closed section has been connected in parallel with the run push button and the normally open section has been connected in series with the holding contacts. Explain how this circuit operates.arrow_forwardWhat is opto-isolation?arrow_forward
- Refer to the circuit shown in Figure 109. In this circuit the jog push button has again been connected incorrectly. The normally closed section of the button has been connected in series with the normally open run push button and the normally open section of the jog button is connecting in parallel with the holding contacts. Explain how this circuit operates.arrow_forwardRefer 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 33–6. You are to install this control system. How many auxiliary contacts should starter 1L contain and how many are normally open and how many are normally closed?arrow_forward
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