A loud buzzing noise coming from the contacts in a magnetic controller can be caused by what condition?
β’ Magnetic controllers and how their contacts open/close β’ Effect of mechanical vibration vs electrical problems on noise β’ How the air gap and magnet face condition affect coil pull-in
β’ Which of these conditions would most likely cause a rapid mechanical chatter rather than a steady electrical hum? β’ If the electromagnet canβt pull the armature in firmly, what happens to the moving part and the contacts? β’ Which condition would prevent the magnet faces from seating tightly together, and what kind of sound would that make?
β’ Distinguish between electrical overload effects (heat, tripping) vs mechanical chatter (noise, vibration) β’ Consider how a larger-than-normal air gap or obstruction affects magnetic pull and armature motion β’ Think about whether dirt alone makes a loud buzzing or more of a weak, unreliable pull-in without pronounced chatter
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