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INPUT Nominal Voltage : 3 x 400 VAC (3Ph+N) Voltage Range : 190-520 VAC (3-phase) at 50% load ; 305-478 VAC (3-phase) at 100% load - Frequency Range : 46-54 Hz or 56-64Hz - Power Factor : ?0.99 @ 100% Load - THDi : < 6% @ 100% Load OUTPUT - Output Voltage : 208/220/230/240VAC - AC Voltage Regulation (Batt. Mode) : ± 1 % - Frequency Range (Synchronized Range) : 46-54Hz or 56-64Hz - Frequency Range (Batt. Mode) : 50 Hz ± 0.1 Hz or 60 Hz ± 0.1 Hz - Current Crest Ratio : 3 : 1 (max) - Harmonic Distortion : ?2 % THD (Linear Load) ; ?5 % THD (Non-Linear Load) - Waveform (Batt. Mode) : Pure Sinewave