Transient voltages on the AC power lines can cause inrush currents to an AC-PWM drive, resulting in an overvoltage condition of the DC bus.
Causes of Nuisance Tripping Transient voltages, commonly caused by capacitor switching, or the switching of large load blocks, can result in an overvoltage condition of the DC bus. This overvoltage condition will cause the Drive to shut down in order to protect its components. These transients can sometimes be very severe and too quick for the Drive to shut down. Indicators of Nuisance Tripping