An unplanned production interruption can have various causes. The plant power supply could be one of the possible reasons. It can be affected by temporary power interruptions, power outage or long/short duration voltage disturbances (drops, spikes or noise). Sometimes the power disturbance even interferes for only a very short moment with the highly sensitive equipment. In that case, the drive system or electronic equipment interrupts the production but the equipment concerned shows no fault after reset.