... isolation transformer, EPO & ECO, manual maintenance bypassFeatures:Three phase in and out system, compatible with utility of 380 ... qualitySupport all kinds of load, high overload capabilityFully digital control with three DSPs including IGBT rectifier, inverter, chargerDigital ... /60Hz±3Hz, adjustableFrequency precision (free running)±0.01%Phase tolerance120°±0.5° (balance and unbalance load)Voltage ...