... . Variable Frequency Drive characteristicsVFD is a masterpiece of outstanding performance and high reliability, which is widely used for ... VFD, direct 3, 3.3, 4.16, 6, 6.6, 10, 11 kV input, direct 3, 3.3, 4.16, ... diagnosis ability. VFD displays detailed failure message in local interface and send the alarm to ... one channel of auxiliary power supply is in failure, the redundant channel of auxiliary power ...