You are troubleshooting the control circuit...

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Question 1 of 2066636eed28f7522a1c51dc96

You are troubleshooting the control circuit shown in figure "A" of the illustration utilizing on-line techniques. With the start button depressed, the following readings are obtained with a voltmeter: (Refer to Illustration EL-0123) "X1" to "X2" reads 115 VAC. "1" to "X2" reads 115 VAC. "2" to "X2" reads 0 VAC. "3" to "X2" reads 0 VAC. Which of the following indicates what the fault is?

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Question 1 of 20

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🔍 Key Concepts

• Understanding how voltage appears on the line side and load side of an open contact in a control circuit • Relationship between readings at X1–X2 and the condition of the control transformer and primary fuse • How voltage should step through the series path: X1 → Stop → Start → M coil → OLs → X2 when the start button is pressed

💭 Think About

• If you truly have 115 VAC across X1–X2, what does that immediately tell you about the control transformer and any fuse feeding its primary? • In a simple series control circuit, where will you see full line voltage relative to X2 when there is an open contact, and where will you see 0 VAC? Apply that to points 1, 2, and 3. • Compare the expected voltage at point 2 when the start button is pressed for each possible fault (open transformer secondary, open start, open stop, blown fuse). Which fault would make point 1 hot but points 2 and 3 dead?

✅ Before You Answer

• Confirm that 115 VAC at X1–X2 means the transformer secondary is energized and not open-circuited, and the primary fuse feeding it is intact. • Trace the control path from X1 through Stop, Start, M coil, OLs back to X2, and predict voltages at points 1, 2, and 3 for each proposed fault. • Be sure which side of the stop and start contacts terminals 1, 2, and 3 are on, since that determines whether they should be at 115 VAC or 0 VAC when a contact is open.

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