If power were lost to the hoist controller...

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Question 1 of 205eccefa3bacbc34ba4d480b1

If power were lost to the hoist controller shown in the illustration while in 'second point hoist' the winch would stop. When power is restored, how would the winch respond? See illustration EL-0102.

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Question 1 of 20

5eccefa3bacbc34ba4d480b1

If power were lost to the hoist controller shown in the illustration while in 'second point hoist' the winch would stop. When power is restored, how would the winch respond? See illustration EL-0102.

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🔍 Key Concepts

• Master switch positions (MS 1–MS 8) and which contacts are closed in 'second point hoist' • Role of the undervoltage (UV) relay and its contacts when power is lost and then restored • How the MS 1 off-position contact and the interlocks with 1A/2A/3A/4A contactors prevent automatic restarting

💭 Think About

• Trace the control circuit from the power source, through the UV relay, to the hoist contactors when the master switch is on second point hoist. What opens when power fails? • When power comes back, ask yourself: does the UV relay re-energize by itself, or does it require the master switch to be in a particular position first? • Compare which MS contacts are closed in OFF versus second point hoist. Which of those are needed to pick up the UV relay and then the hoist contactors?

✅ Before You Answer

• Identify exactly which MS contacts are closed in second point hoist and which are only closed in the OFF position (especially MS 1). • Confirm whether the UV relay coil can be energized with the master switch left in second point hoist after a power loss. • Verify if any holding circuit exists that would allow the hoist to resume motion without first returning the master switch to OFF.

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Question 1 of 205eccefa3bacbc34ba4d480b1

If power were lost to the hoist controller shown in the illustration while in 'second point hoist' the winch would stop. When power is restored, how would the winch respond? See illustration EL-0102.

Back

Question 1 of 20

5eccefa3bacbc34ba4d480b1

If power were lost to the hoist controller shown in the illustration while in 'second point hoist' the winch would stop. When power is restored, how would the winch respond? See 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

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

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— No credit card needed