L1 L2 L3 PE Dynamic Brake Resistor SOHO NC Inverter Rectifier 3~ Charging Resistor Optional Brake Chopper IGBT inverter CT Fan Power supply 3~ Measure- ments Gate Drivers + IGBT protection RS-232 PC Micro Processor Control I/O u v w 图 2.7-1 NC 变频器框图 2-8 3. 安装 3.1 3.1.1 ...