The illustrated motor fails to start and...

Question 1 / 2066636eed28f7522a1c51d693

Question 1 of 2066636eed28f7522a1c51d693

The illustrated motor fails to start and gives a loud hum when the start button is depressed, what should then be your first action? Illustration EL-0007

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Question 1 of 20

66636eed28f7522a1c51d693

The illustrated motor fails to start and gives a loud hum when the start button is depressed, what should then be your first action? Illustration EL-0007

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🔍 Key Concepts

• Motor starter control circuit: how the Stop, Start, and M coil work together in the lower (B) diagram • What a loud hum without rotation usually indicates about the motor (stalled / locked rotor, high current) • Why we use overload protection (OL) and the importance of de‑energizing a circuit before troubleshooting

💭 Think About

• When the motor is humming but not turning, what does that tell you about whether the M contactor coil is currently energized? Trace the circuit in diagram B from L1 through Stop/Start to the M coil. • Before you touch or inspect any part of a stalled motor or its starter, what must you do with the control circuit to remove power from the motor and the M contactor? • Under what condition would the thermal overload (OL) need to be reset, and does the diagram or the question say that this condition has already occurred?

✅ Before You Answer

• Verify which device in the control circuit actually removes power from the M coil and opens the main contacts feeding the motor. • Confirm whether the overload contacts (OL) would already be tripped just because the motor hums briefly, or if they trip only after sustained overcurrent. • Eliminate any option that involves working on or holding energized components (like the contactor or internal motor parts) before the circuit is safely de‑energized.

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Question 1 of 20

The illustrated motor fails to start and gives a loud hum when the start button is depressed, what should then be your first action? Illustration EL-0007

disassemble the motor to fix the centrifugal switch so the start windings will be energized

push the stop button to de-energize the "M" coil

reset the thermal overload

hold the "M" contactor closed by hand while wearing electrical safety gloves to get motor started

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Question 1 / 2066636eed28f7522a1c51d693

Question 1 of 2066636eed28f7522a1c51d693

The illustrated motor fails to start and gives a loud hum when the start button is depressed, what should then be your first action? Illustration EL-0007

Back

Question 1 of 20

66636eed28f7522a1c51d693

The illustrated motor fails to start and gives a loud hum when the start button is depressed, what should then be your first action? Illustration EL-0007

No comments yet

Be the first to share your thoughts!

If the question has a related picture, it will appear here.

🔍 Key Concepts

💭 Think About

✅ Before You Answer

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

Quick actions

— No credit card needed