... pump.. Circulating mode of 1 drive controlling n pumps : AC drives start or stop water pumps circularly according ... frequency, present time, present flow of water, present output current, present output voltage, types of faults and parameters; Four LED ... 10degrees centigrade~+50 degrees centigradeEnvironment HumidityBelow 90% (no water-bead coagulation)Vibration StrengthBelow 0.5g (acceleration)Height ...