... 230 / 400V AC, 50Hz / 60Hz, 0.8pF three-phase and four wires alternating current output 9) Frequency: <3% ,10) Frequency at stable state ... over temperature, The oil pulls down, over speed, over load and over current B) Operation display: I) Unit voltage, tri-phase load ... current and frequency display Ii) Water temperature, oil pressure display Iii) ...