A segmented mirror control system is essential to realize extremely large telescopes. In this paper, we report the results of the control experiments of the Centralized Control System (CCS) which has been implemented in the Seimei telescope. Theoretical dynamic characteristics are observed from the transient response analysis. The control performance required from the astronomical observation is shown to be successfully achieved. This report is the world's first experimental result of segmented primary mirror control and would be useful for the development of the giant segmented primary mirror telescopes in the future.
