... AC, 50Hz / 60Hz, 0.8Pf , three phase four wires Use: can be used for the open type and the soundproof type , automatic ... temperature Low oil pressureOver loadBettery charging failureOperating displayUnit voltage,tri-phase load current and frequency displayWater temperature ,oil ... over current b) Operation display: i) Unit voltage, tri-phase load current and frequency display ii) Water temperature, ...