| 摘要 |
PURPOSE:To smoothly stop a door at a prescribed position, by correcting the next high-speed running time in accordance with a low-speed running time when the door is actually moved in opening and closing directions and adjusting the low-speed running time to a standard low-speed running time. CONSTITUTION:A command calculating circuit 14 calculated a low-speed running time tL from a counted reference pulse number PN and finds the next corrected high-speed running time tn+1 by making the calculation of the following formula by using the calculated low-speed running time tL and a standard low-speed running time T inputted by a standard low-speed running time setter 16: tn+1=Tn +K(tL.n-T)VL/VH where, VH and VL are high-speed and low-speed running speeds, respectively, and K is a correction factor being <=1. Since the possibility of a door colliding with the door stop exists when the standard low-speed run ning time T is set at once, the time T is set in plural steps. Therefore, the door 6 is smoothly stopped at a prescribed position. |
