The VM100 series protective open-loop vector frequency converter continues the style of the VM1 series, and supports V/F control, open-loop vector control, and VM100E synchronous machine use in terms of control performance. The VM100 series can be applied in industries such as food packaging, woodworking carving, automated assembly lines, ceramics, textiles, industrial washing machines, metal processing, fans and pumps, with high protection level, complete protection functions, excellent performance, and simple debugging.