User Manual of EM760 High-Performance Inverter Fig. 3-7 380V 450-560kW main power terminal 3.2.2 Functions of main circuit terminals Table 3-1 Functions of main circuit terminals 45 Terminal label Function description R, S, T AC power input terminal, connected to three-phase AC power supply U, V, W AC output terminal of the inverter, connected to three-phase AC motor Positive and negative terminals of the internal DC bus, connected to external braking unit , PB Braking resistor terminal, with one end connected to and the other to PB Grounding terminal, connected to earth