... ~400HZFrequency setting modeDigital, Analog, Serial Communication, Multi-Step Speed , PID etc. PID control function Multi-step Speed Control function 8 steps speed ... Machine, compressor, extruding machine,injection machine,motor,braiding machine, pressure fan; forced draught blower; blower, blowing machine,blow molding machine, root's blower, film blowing machine, cutter bar ...