In ZX7-350 series welding machine models, the number "350" followed by the letters "A" and "S" usually means single power supply or dual power supply welding machine. For example, ZX7-350A is a single-power single-phase 220V welder, and ZX7-350S is a dual-power three-phase (or two-phase) 380V/ single-phase 220V welder. There is little difference in technical parameters of the same type of welding machines from different manufacturers. The following figure is a comparison of reference data of main power parameters of a brand single-power welding machine and dual-power welding machine:
If ZX7-350MOS welder with 380V power supply is applied to single-phase 220V power supply, it is necessary to install 220V voltage doubling rectifier circuit and use relay to switch dual power supplies. The technical skills of electronics and electricians of refitted personnel are highly required.