VFD stands for Delta Inverter, and 022 stands for 2.2KW For example, 007 stands for 0.75KW, 0 15 stands for 1.5KW,10 stands for1/kw,/kloc-0. M stands for mini inverter, that is, if you ask someone for an inverter, they will ask you what series you want. If you want economy, you can say economy, otherwise you can say M series. Some are 43B, or 43A, 4 stands for 380V-460V, 3 stands for three phases, some are 2 1A or 2 1B, or 23A goods 23B, 2 stands for 220V-230V, 1 stands for single phase and 3 stands for three phases. There is no difference between A and B. The following -A and -ZA, -A means there is an operation panel, and -ZA means there is no operation panel.
VFD022M43B-A This stands for Delta 2.2KW, 380V three-phase, panel and economical M-series inverter.
VFD022M43B-ZA This represents Delta's 2.2KW, 380V three-phase and economical M-series panel-less inverter.
VFD022M23B This represents Delta 2.2 kW, 220 V three-phase, panel-mounted, economical M-series inverter.
VFD022M2 1A This represents Delta 2.2KW, 220V single-phase economical M-series inverter with panel.