As shown in the illustration, what is...

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Question 1 of 2066636eed28f7522a1c51db78

As shown in the illustration, what is responsible for maintaining the "UV" relay energized when the master switch handle is moved away from the "off" position? Illustration EL-0102

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Question 1 of 20

66636eed28f7522a1c51db78

As shown in the illustration, what is responsible for maintaining the "UV" relay energized when the master switch handle is moved away from the "off" position? Illustration EL-0102

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🔍 Key Concepts

• Undervoltage (UV) relay holding/sealing circuits in motor control diagrams • Difference between momentary master switch contacts (MS 1 / MS 2) and a relay’s own auxiliary contacts • How a sealing (holding) contact keeps a relay energized after the initial energizing path through the switch is removed

💭 Think About

• Trace the path of current that first energizes the UV relay coil when the master switch is moved from OFF toward HOIST or LOWER. Which contact closes first to supply power to the UV coil? • After the master switch is moved further away from that first position (or let go), which contact remains closed so that current can continue to flow to the UV coil, even if the original master switch contact opens? • Look at which contact in the diagram is drawn in parallel with the master switch path to the UV coil. What type of contact is it (NO/NC, and which device operates it)?

✅ Before You Answer

• Verify which contact(s) are physically part of the UV relay (auxiliary contacts labeled with UV) versus those belonging to the master switch (MS 1, MS 2) or the overload (OL). • Confirm that a true holding/sealing contact is a normally open contact that closes when its own relay energizes and is wired in parallel with the initial energizing path. • Make sure the contact you pick can stay closed independently of the master switch handle position, as long as the UV relay itself remains energized.

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Question 1 of 2066636eed28f7522a1c51db78

As shown in the illustration, what is responsible for maintaining the "UV" relay energized when the master switch handle is moved away from the "off" position? Illustration EL-0102

Back

Question 1 of 20

66636eed28f7522a1c51db78

As shown in the illustration, what is responsible for maintaining the "UV" relay energized when the master switch handle is moved away from the "off" position? Illustration EL-0102

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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