... 230 / 400V AC, 50Hz / 60Hz, 0.8pF three-phase and four wires alternating current output9) Frequency: <3%10) Frequency at stable state: <0 ... 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) ...