An AC winch hoist controller such as shown...

Question 1 / 2066636eed28f7522a1c51d2f0

Question 1 of 2066636eed28f7522a1c51d2f0

An AC winch hoist controller such as shown in the illustration has welded contacts on the hoist contactor, and the contacts must be replaced. Before replacing the contacts, the cause for the welding of the contacts must be determined. Which of the following statements describes the possible causes? Illustration EL-0102

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🔍 Key Concepts

• Effect of coil voltage on contactor pull-in and contact chatter • How spring strength affects contact pressure and arcing at the contacts • Relationship between arcing/heat and contacts becoming welded together

💭 Think About

• Think about what happens to the contacts if the magnetic coil does NOT get enough voltage: do they pull in firmly, or do they chatter and arc? • Now think about springs: which condition (too strong vs too weak) would reduce firm contact pressure and increase arcing and heat at the contact faces? • Which combination of coil voltage level and spring condition is most likely to cause repeated arcing and overheating until the contacts weld?

✅ Before You Answer

• Verify which choices mention low vs high coil voltage and connect that to contact chatter and poor closing force. • Check which spring condition leads to reduced contact pressure, not increased, making it easier for the contacts to arc and overheat. • Eliminate any option where the described conditions would actually make the contacts close more firmly and reduce arcing rather than increase it.

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Question 1 of 20

The welding of contacts may be caused by low applied voltage to the operating coil (less than 85% of rated voltage) or by excessively strong springs.

The welding of contacts may be caused by excessively applied voltage to the operating coil (more than 110% of rated voltage) or by excessively strong springs.

The welding of contacts may be caused by excessively applied voltage to the operating coil (more than 110% of rated voltage) or by weak springs.

Question 1 / 2066636eed28f7522a1c51d2f0

Question 1 of 2066636eed28f7522a1c51d2f0

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Question 1 of 20

66636eed28f7522a1c51d2f0

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🔍 Key Concepts

💭 Think About

✅ Before You Answer

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