GRF series freight elevators employing the fully PC ontrolling technology, AC variable frequency and variable voltage VVVF, has not only the outstanding performance in energy saving and precision of leveling and highly effective loaad capcity, but also take the user's requirements into full considertaion when designing. As a result, the performanmce/price ratio of these elevators is extremely high and the elevators can be used in vertical transportation occasion such as factories, transportation centers, warehouses and vehicles, vertical transportation.