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Multiple choices cont.: c. The 3M load contacts are welded shut. d. The normally open 3M contact between wire numbers 23 and 31 is hung closed.

Multiple choices cont.: c. The 3M load contacts are welded shut. d. The normally open 3M contact between wire numbers 23 and 31 is hung closed.

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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Multiple choices cont.: c. The 3M load contacts are welded shut. d. The normally open 3M contact between wire numbers 23 and 31 is hung closed.
154 Section 2 Basic Control Circuits 43 OL 1M 3 MOTOR 1 OL 9 OL 10 11 2M 11 2M OL 13 MOTOR 2 2M OL 15 OL 17 16 S SM 16 17 '18 1819 19 MOTOR 3 SM SM 20 20 21 21 CONTROL TRANSFORMER 28 START 1 STOP OL1 OL2 OL3 28 23 24 24 25 25 26 27 1M 24 1M START 2 1M 29 29 23 SO 25 2M 23 29 2M START 3 2M 23 O 31 31 32 3M 25 3M Figure 12-14 Sequence control schematic with wire numbers. Basic control circuits
Transcribed Image Text:154 Section 2 Basic Control Circuits 43 OL 1M 3 MOTOR 1 OL 9 OL 10 11 2M 11 2M OL 13 MOTOR 2 2M OL 15 OL 17 16 S SM 16 17 '18 1819 19 MOTOR 3 SM SM 20 20 21 21 CONTROL TRANSFORMER 28 START 1 STOP OL1 OL2 OL3 28 23 24 24 25 25 26 27 1M 24 1M START 2 1M 29 29 23 SO 25 2M 23 29 2M START 3 2M 23 O 31 31 32 3M 25 3M Figure 12-14 Sequence control schematic with wire numbers. Basic control circuits
3. Assume 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. WWhich of the following could cause this problem? a. STOP button is shorted. b. The 2M contact between wire numbers 31 and 32 is hung closed.
Transcribed Image Text:3. Assume 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. WWhich of the following could cause this problem? a. STOP button is shorted. b. The 2M contact between wire numbers 31 and 32 is hung closed.
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