As shown in the illustrated three phase...

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Question 1 of 205eccefa4bacbc34ba4d4834f

As shown in the illustrated three phase squirrel cage induction motor controller, what is the functional purpose of the "R" contactor? See illustration EL-0117.

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Question 1 of 20

5eccefa4bacbc34ba4d4834f

As shown in the illustrated three phase squirrel cage induction motor controller, what is the functional purpose of the "R" contactor? See illustration EL-0117.

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🔍 Key Concepts

• Wye–delta starting for three-phase squirrel cage induction motors • Difference between start (S) contactor and run (R) contactor functions • How the motor leads T1–T6 are connected during start vs run periods

💭 Think About

• Look at how the S and R contactors change the connections between T1–T6. During which period (start or run) is each contactor energized? • When R closes, do the three supply lines end up feeding one end of each winding only (wye), or do they connect the windings end‑to‑end in a loop (delta)? • Compare the motor’s connection when only S is closed versus when both S and R are closed. How does that change which ‘part’ of the winding is in use?

✅ Before You Answer

• Trace, on the diagram, exactly which terminals are tied together when only S is energized and when S and R are both energized • Verify whether the final (run) configuration of the windings is wye or delta by checking if three junction points come together (wye) or form a closed triangle (delta) • Confirm whether R affects the first part, second part, or both parts of the windings by following the paths from T1–T6 through the R contacts

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Question 1 of 205eccefa4bacbc34ba4d4834f

As shown in the illustrated three phase squirrel cage induction motor controller, what is the functional purpose of the "R" contactor? See illustration EL-0117.

Back

Question 1 of 20

5eccefa4bacbc34ba4d4834f

As shown in the illustrated three phase squirrel cage induction motor controller, what is the functional purpose of the "R" contactor? See illustration EL-0117.

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?

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