... UPS System 1. True online double conversion 2. Pure sine wave output 3. With manual bypass 4. UPS, ECO ... , more reliableFull protection, overload, over voltage, short circuit, over temperature etcCold startGenerator compatibleWith RS232 and RS485 standard ... frequency ultralimit,phase wrong,phase lost outputovercurrent, short circuit, power factor lowEconomic running modeEconomic mode available,overall ...