Chapter 5 Main Circuit Terminals MS300 (High Speed Model) 5-1 Main Circuit Diagram 5-4 Terminals Descriptions R/L1, S/L2 Mains input terminals 1-phase R/L1, S/L2, T/L3 Mains input terminals 3-phase U/T1, V/T2, W/T3 Motor output terminals for connecting 3-phase IM and PM motors. +1, +2 Connections for DC reactor to improve the power factor and harmonics. The jumper needs to be removed in that case. DC+, DC- Connections for brake unit (VFDB series) Common DC Bus B1, B2 Connections for brake resistor (optional) Earth connection, please comply with local regulations.