GRF series freight elevators, employing the fully PC controlling technology, AC variable frequency and variable voltage VVVF, has not only the outstanding performance in energy saving and precision of leveling and highly effective load capacity, but also take the user's requirementes into full consideration when designing. As a result, the performance/price ratio of these elevators is high and the elvators can be used in vertical transport occasion such as factories, transportation centers, warehouse and vehicles, vertical transportaion.