Work load: W [kg] Speed: V [mm/s] Work load [kg] Overhang: L1 [mm] T1 a1 a2 L Speed: V [mm/s] Time [s] T2 T3 T4 0 200 400 600 800 1000 70 60 50 40 30 20 10 0 L1 Mep m L : Stroke [mm] ・・・ (Operating condition) V : Speed [mm/s] ・・・ (Operating condition) a1: Acceleration [mm/s2] ・・・ (Operating condition) a2: Deceleration [mm/s2] ・・・ (Operating condition) T1: Acceleration time [s] Time until reaching the set speed T2: Constant speed time [s] Time while the actuator is operating at a constant speed T3: Deceleration time [s] Time from the beginning of the constant speed operation to stop T4: Settling time [s] Time until in position is completed 100 W !Workpiece mass: 55 [kg] !Speed: 300 [mm/s] !Acceleration/Deceleration: 3,000 [mm/s2] !Stroke: 200 [mm] !Mounting position: Horizontal upward !Incremental encoder !Workpiece mounting condition: !Settling time (LEFS40) Check the work load.speed. Select a model based on the workpiece mass and speed which are within the range of the actuator body specifications with reference to the on page 4. Selection example) The LEFS40S4B-200 is temporarily selected based on the graph shown on the right side. Check the cycle time. Calculate the cycle time using the following calculation method. Cycle time: T can be found from the following equation. !T4: Settling time varies depending on the conditions such as motor types, load and in positioning of the step data. Therefore, please calculate the settling time with reference to the following value. !T2: Constant speed time can be found from the following equation. !T1: Acceleration time and T3: Deceleration time can be obtained by the following equation. Check the guide moment. 1000 mm/s2 3000 mm/s2 5000 mm/s2 Calculation example) T1 to T4 can be calculated as follows. T1 = V/a1 = 300/3000 = 0.1 [s], T3 = V/a2 = 300/3000 = 0.1 [s] T4 = 0.05 [s] Therefore, the cycle time can be obtained as follows. T = T1 + T2 + T3 + T4 = 0.1 + 0.57 + 0.1 + 0.05 = 0.82 [s] T2 = = = 0.57 [s] Lead 20: LEFS40�ｮA Lead 10: LEFS40�ｮB 0 10 20 30 40 50 60 1,500 1,000 500 0 . The conditions for the settling time vary depending on the AC servo motor or driver to be used. Selection Procedure Selection Example Operating conditions T = T1 + T2 + T3 + T4 [s] T4 = 0.05 [s] T1 = V/a1 [s] T3 = V/a2 [s] T2 = [s] L . 0.5 ・ V ・ (T1 + T3) V Step 1 Step 2 Step 3 Based on the above calculation result, the LEFS40S4B-200 is selected. L . 0.5 ・ V ・ (T1 + T3) V 200 . 0.5 ・ 300 ・ (0.1 + 0.1) 300 Electric Actuator/Slider Type Ball Screw Drive/Series LEFS Model Selection Motorless Type Step 1 Check the work load.speed. Step 2 Check the cycle time. Step 3 Check the allowable moment. 3