... run ultra silently; build in PID, can realize close-loop control conveniently; 36 kinds of perfect protection and alarm ... step control function6. Bulit-in PID to realize close-loop control 7. Dynamic torque current control, rapid response ... machine, Fan & pump, Chemical fiber, Sugar, Glass, Packaging, Metal, Plastic machining, Paper & printing, Petrochemical, Textile priting ALPHA 6000S high quality ...