... Description A. Application: Supply variable frequency three -phase emergency power supply for fire facility only ... .5, 7.5, 11, 15, 18.5, 22, 30, 37, 45, 55, 75, 93, 110, 132, ... Main technical parameters (EPS series variable frequency three-phase(power type)emergency power supply) Model EPS ... -2.2~500KW Input Voltage 380 ± 20% Phase no. Three-phase four-wire +PE Frequency 50Hz ± 5% Output ...