... Description A. Application: Supply variable frequency three -phase emergency power supply for fire facility only ... .2, 3.7, 5.5, 7.5, 11, 15, 18.5, 22, 30, 37, 45, 55, ... set according to design requirement. Main technical parameters (EPS series variable frequency three-phase(power type)emergency ... -2.2~500KW Input Voltage 380 ± 20% Phase no. Three-phase four-wire +PE Frequency 50Hz ± 5% Output ...