... %Frequency Regulation Rate ≤±5% Random Frequency Variation ≤±0.5% 3),Engine Specification, Model1003G,1003TG,1004G,1004TG,1006TAG,1006TG1A,1006TG2ACooing Method Forced water ... Voltage 400V (Available with customer requirements) Power 0.8 Voltage Adjust Range ≥5% Protection Grade IP23 Insulation Grade H 5),Control ...