Adopting modern control theory, modularization design, DSP controlled high quality material and parts/components, together with advanced SMT manufacturing engineering, PRR1000 series soft starter is a high tech product combing digit, computer and modern automatic control theories. It is characteristic of high performance, high quality and skinny volume, and is widely applicable for starting and protection of three-phase AC380V/50Hz squirrel-cage motors in various industries from 15kw to 315kw.

Principle introduction£º Three reverse-parallel connection SCR modules are adopted as power element. The soft starter can pick up synchronization signal from input voltage sampling, and realize feedback fuzzy control by output current sampling, trace the phase automatically and control phase displacement angle. Voltage can thus be increased step by step, and startup current will be under control. After startup, the bypass contactor will short-circuit the SCR. The motor will finally be driven into the electricity network for operation.