What is the primary functional purpose of...

Question 1 / 205eccefa4bacbc34ba4d4833f

Question 1 of 205eccefa4bacbc34ba4d4833f

What is the primary functional purpose of the KM3 contactor as shown in the illustration? See illustration EL-0080.

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Question 1 of 20

5eccefa4bacbc34ba4d4833f

What is the primary functional purpose of the KM3 contactor as shown in the illustration? See illustration EL-0080.

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🔍 Key Concepts

• Autotransformer reduced-voltage starting – how the circuit uses different contactors for START vs RUN • Roles of contactors KM1, KM2, KM3 in the power circuit portion of EL-0080 • Difference between feeding the motor through the autotransformer versus across the line (full voltage)

💭 Think About

• When the starter is in the START position, trace the path from L1–L2–L3 to the motor terminals U–V–W. Through which contacts does current actually pass? • In the RUN condition, which contactor(s) must be picked up or dropped out so the motor is no longer connected to the autotransformer windings? • Looking only at the left (power) side of the diagram, what changes for the motor terminals when KM3 changes state compared with when only KM1 and KM2 are energized?

✅ Before You Answer

• Verify which contactor directly bridges the motor leads (U, V, W) to the line side (L1, L2, L3) without going through the transformer windings. • Confirm from the dashed outlines which contacts belong to KM3 and whether they are in series with the autotransformer or bypass it. • Be sure you can state for each contactor: "KM1 does ___ in START, KM2 does ___ in START, KM3 does ___ in RUN" before choosing your option.

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Question 1 of 20

What is the primary functional purpose of the KM3 contactor as shown in the illustration? See illustration EL-0080.

connects the autotransformer in "wye" configuration while in the start mode

connects the motor to the autotransformer while in the start mode

connects the motor across line while in the start mode

connects the motor across line wile in the run mode

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Question 1 / 205eccefa4bacbc34ba4d4833f

Question 1 of 205eccefa4bacbc34ba4d4833f

What is the primary functional purpose of the KM3 contactor as shown in the illustration? See illustration EL-0080.

Back

Question 1 of 20

5eccefa4bacbc34ba4d4833f

What is the primary functional purpose of the KM3 contactor as shown in the illustration? See illustration EL-0080.

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

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