85 Mode 3-3(dual source)1. Input: connect mian-ground cable (PE) to chassis first;short ‘UPS input terminal N/N’ with ‘busbar #1’, then connect AC mainsource cable(N) and bypass source cable(N) by back to back mounted;connect ‘UPS input terminal L1/L2/L3’ to main source cable(L1/L2/L3);connect ‘UPS bypass terminal L1/L2/L3’ to bypass source cable(L1/L2/L3).2. Output: connect ground cable (PE) to chassis first;short ‘UPS output terminal N/N’ with ‘busbar #1’, then connect ACcable(N);connect ‘UPS output terminal L1/L2/L3’ to AC cable(L1/L2/L3).