| An AC winch hoist controller such as shown in the illustration has a burned out hoist contactor coil, and the coil must be replaced. Before replacing the coil, the cause for the burn-out must be determined. What statement represents possible causes? EL-0102 |
| A) The coil burnout may be caused by insufficient voltage applied to the coil (below 85% of rated voltage); however, excessive voltage applied to the coil (above 110% of rated voltage) will not cause a burnout. |
| B) The coil burnout may be caused by excessive voltage applied to the coil (above 110% of rated voltage); however, insufficient voltage applied to the coil (below 85% of rated voltage) will not cause a burnout. |
| C) The coil burnout may occur with a normal voltage applied to the coil (between 85% and 110% of rated voltage) if accumulated dirt prevents proper seating of the armature to the magnet. |
| D) The coil burnout may occur with a normal voltage applied to the coil (between 85% and 110% of rated voltage) if the armature is allowed to seat against the magnet with no air gap. |
