The motor of the illustrated motor...

Question 1 / 2066636eed28f7522a1c51d7ea

Question 1 of 2066636eed28f7522a1c51d7ea

The motor of the illustrated motor controller fails to start on an attempted startup. You ensure the motor has not tripped out on overload, and you check the disconnect switch closed. With the start button depressed, a voltmeter reading between 3 and 4, as in figure "A" shown in the illustration, indicates line voltage. After re- opening the disconnect switch and verifying the circuit de-energized, what should be your next step in the troubleshooting process? Illustration EL-0007

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🔍 Key Concepts

• Trace the control circuit from L1, through the stop and start pushbuttons, to point 3, then through the M coil and overload (OL) contact to point 4 and back to the other line • A voltmeter reading line voltage between 3 and 4 with the start button held in tells you which parts of the series path already have continuity and which section is open • Understand which devices are normally open (NO) and which are normally closed (NC), and how that affects a resistance (ohmmeter) test with power secured

💭 Think About

• If you see full line voltage between 3 and 4 when the start button is pressed, what does that tell you about the condition of the stop and start pushbuttons and the wiring up to point 3? • Which remaining series components between 3 and 4 could prevent current from flowing to the coil even though you have line voltage present at 3 and at 4? • Looking at each answer choice, which test would give you new information about a component that has not already been proven by your voltage measurement?

✅ Before You Answer

• Be sure power is secured and tagged out before doing any resistance measurements • Confirm from the diagram which terminals are directly across the M contactor coil and which are across the NC overload contact • Eliminate any tests that would only re‑check components that your voltmeter reading has already shown to be closed and conducting when the start button is depressed

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Question 1 of 20

after depressing, check the resistance across the normally open start button contacts (across 2 and 3)

without depressing, check the resistance across the normally closed stop button contacts (across 1 and 2)

check the resistance across the contactor coil "M" (across 3 and 5)

check the resistance across the normally closed overload relay contacts (across 4 and 5)

Question 1 / 2066636eed28f7522a1c51d7ea

Question 1 of 2066636eed28f7522a1c51d7ea

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Question 1 of 20

66636eed28f7522a1c51d7ea

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🔍 Key Concepts

💭 Think About

✅ Before You Answer

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