Which of the following illustrated circuit...

Question 1 / 205eccefa4bacbc34ba4d4839f

Question 1 of 205eccefa4bacbc34ba4d4839f

Which of the following illustrated circuit schematics provides phase failure protection for a three phase motor using load side voltage sensing technology? See illustration EL-0222.

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Question 1 of 20

5eccefa4bacbc34ba4d4839f

Which of the following illustrated circuit schematics provides phase failure protection for a three phase motor using load side voltage sensing technology? See illustration EL-0222.

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🔍 Key Concepts

• Phase failure protection must sense loss of one phase to de-energize the motor starter coil. • Load side voltage sensing means the relay monitors the voltage on the MOTOR side of the contactor/starter, not on the incoming line side. • Distinguish voltage sensing (direct connection to all three phase conductors) from current sensing (using current transformers or CTs).

💭 Think About

• In which schematic is the phase failure relay actually connected to the same three conductors that feed the motor AFTER the starter contacts? • Which diagram clearly shows the relay terminals tied directly to L1, L2, and L3 on the motor side, without using current transformers? • Which options can you eliminate because the relay is monitoring line side power or motor current rather than the load-side phase VOLTAGE?

✅ Before You Answer

• Verify that the phase failure relay is connected on the load side of the motor starter/contactor (M contacts), not directly to the supply lines. • Confirm that the relay connections are to L1, L2, and L3 voltage lines, and that there are no CT symbols between the motor lines and the relay. • Check that loss of any phase on the motor terminals would immediately remove the relay’s output and open the control circuit to the starter coil (M).

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Question 1 of 20

Which of the following illustrated circuit schematics provides phase failure protection for a three phase motor using load side voltage sensing technology? See illustration EL-0222.

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Question 1 / 205eccefa4bacbc34ba4d4839f

Question 1 of 205eccefa4bacbc34ba4d4839f

Which of the following illustrated circuit schematics provides phase failure protection for a three phase motor using load side voltage sensing technology? See illustration EL-0222.

Back

Question 1 of 20

5eccefa4bacbc34ba4d4839f

Which of the following illustrated circuit schematics provides phase failure protection for a three phase motor using load side voltage sensing technology? See illustration EL-0222.

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