Understanding Motor Controls
3rd Edition
ISBN: 9781305498129
Author: Stephen L. Herman
Publisher: Cengage Learning
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Chapter 4, Problem 7RQ
To determine
Identify the device that is used to sense the amount of motor current in an electronic overload relay.
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Understanding Motor Controls
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- What pin numbers are connected to the coil of an 8-pin control relay?arrow_forwardRefer to the schematic diagram in Figure 318. Assume that the motor is not running. When the third speed push button is pressed, the motor starts in its lowest speed. After a delay of 3 seconds, the motor accelerates to second speed and 3 seconds later to third speed. After a period of about 1 minute, the fourth speed push button is pressed, but the motor does not accelerate to fourth speed. Which of the following could cause this problem? a. Control relay CR2 coil is open. b. S2 contactor coil is open. c. CR3 coil is shorted. d. S3 contactor coil is open.arrow_forwardHow many overload sensors are required by the National Electrical Code to protect a direct current motor?arrow_forward
- What is the average voltage drop of an SCR when it is turned on?arrow_forwardWhat is the function of a micro limit switch when used with a manual controller for a wound rotor motor?arrow_forwardAssume that all three motors shown in Figure 12–14 are running. Now assume that the STOP button is pressed and motors #1 and #2 stop running, but motor #3 continues to operate. Which of the following could cause this problem? STOP button is shorted. The 2M contact between wire numbers 31 and 32 is hung closed. The 3M load contacts are welded shut. The normally open 3M contact between wire numbers 23 and 31 is hung closed.arrow_forward
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