The motor fails to start on an attempted...

Question 1 / 2066636eed28f7522a1c51d7e8

Question 1 of 2066636eed28f7522a1c51d7e8

The motor fails to start on an attempted startup. With the start button depressed, a voltmeter reading between 1 and 5, as illustrated in figure "A", indicates line voltage available to the control circuit, what should be your next step in the troubleshooting process? Illustration EL-0007

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🔍 Key Concepts

• Trace the control circuit path in Figure A from point 1 to point 5 with the Start button held in. • Identify which devices in that path are normally closed (NC) and which are normally open (NO), and think about which one is most likely to interrupt the circuit when the motor is overloaded. • Remember that proper troubleshooting usually checks protective devices before assuming a component has failed.

💭 Think About

• If you already see full line voltage available between points 1 and 5 with the Start button depressed, what does that tell you about the disconnect switch (DS) and the supply lines? • Which single component in series with the contactor coil "M" would open automatically if the motor had drawn too much current, and how would that affect whether the contactor coil can energize? • Before testing or replacing the coil, what quick check could restore the circuit if a protective device had operated as designed?

✅ Before You Answer

• Confirm on the diagram that point 1 is tied to L1 (through DS) and point 5 is tied back to the other side of the supply for the control circuit. • List, in order, the series devices between 1 and 5: Stop, Start, M coil, and OL contact – note which are NC/NO. • Ask: which of these series devices is specifically designed to open on overload and can often be manually reset before further testing?

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Question 1 of 20

test the contactor coil "M" for continuity and replace if necessary

ensure that the disconnect switch (DS) is closed

test the stop button for continuity and replace if necessary

attempt to reset the overload relay and determine the cause of the overload if applicable

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Question 1 / 2066636eed28f7522a1c51d7e8

Question 1 of 2066636eed28f7522a1c51d7e8

Back

Question 1 of 20

66636eed28f7522a1c51d7e8

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🔍 Key Concepts

💭 Think About

✅ Before You Answer

👋 Hi! I'm Genie, your AI study assistant. How can I help you with this question?

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