B504 series inverter adopts DSP control system which supplies Sensorless Vector Control(SVC). Detailed Product DescriptionVariable Frequency Drive:single or 3 phase, PID Control Function , Up to 25 fault protections ,Automatic Voltage Regulation (AVR) Function ,multi-step speed , multiple torque setting source ,output freq.0.1-600HzThe combination of multi- modes and switching between different ...