1、Enables V/F, vector and constant torsion three control methods, the easy switching with high accuracy also ensure efficient operating. 2、Comes with complete control ports, the variable frequency drive can be used in various automation equipment with PLC and sensors. 3、Built in PID controller, which can be applied to circumstances requiring constant pressure, constant temperature, constant tension open loop control and closed loop control. 4、8 speed control, high frequency control and textile swing frequency allow it to be used for high speed spindles such as textile engraving machines. 5、User defined multifunction shortcut keys make the operating more convenient, and support instantaneous power failure without stopping function. 6、Also has automatic voltage adjustment function, when the grid voltage changes, the output voltage can be automatically kept constant. 7、Provides up to 25 kinds of fault protection, such as over current protection, over voltage protection, under voltage protection, over temperature protection, phase loss protection, overload protection and other protection.