... .2KW inverter VVVF control, constant,vairable torque mode VD4 series single phase, 220V AC 1.5~2.2KW inverter ... function Running functionCommand modeOperated by three mode: digital panel, control terminal, serial portFrequency setting modeSetting modes can be selected ,including: ... running command;6 channels programmable digital input,can set 35 kinds of function,X6 support 0~20KHz pulse outputAnalog ...