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Engine : Electricity - 1067/1386
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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. What statement represents possible causes? EL-0102
A) 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.
B) 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.
C) 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.
D) The welding of contacts may be caused by low applied voltage to the operating coil (less than 85% of rated voltage) or by weak springs.
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Illustration EL-0102

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