4-2 Function Mode * To switch to 2nd/3rd acceleration time 1 or 2nd/3rd deceleration time 1, allocate 08 (SET)/17 (SET3) to the desired multi-function input and then turn it on. •The set time here indicates the acceleration/deceleration time from 0 Hz to the maximum frequency. 4 Output frequency Max. frequency A004/A204/A304 Functions •When the LAD cancel (LAC) function is selected in the multi-function input selection and the signal is turned on, the acceleration/deceleration time is ignored, and the output frequency instantaneously follows the reference frequency.
•To switch between the 1st/2nd/3rd acceleration times or between the 1st/2nd/3rd deceleration times, allocate 08 (SET)/17 (SET3) to the desired multi-function input (refer to "Multi-function Input Selection" (page 4-76)), and use the SET/SET3. •You can set the acceleration/deceleration time via (1) the Digital Operator, (2) optional board 1, or (3) optional board 2. •Even if a short acceleration/deceleration time is set, the actual time cannot be shorter than the minimum acceleration/deceleration time that is determined by the mechanical inertia moment and the motor torque. If you set a time shorter than the minimum time, an overcurrent/overvoltage trip may occur.
Acceleration Time T S M M L S T T N J J T 9.55 = ( + ) ( ) J L : Inertia moment of the load converted to the motor shaft [kg·m 2 ] J M : Inertia moment of the motor [kg·m 2 ] N M : Motor rotation speed [r/min] T S : Max. acceleration torque with the Inverter driving [N·m] T B : Max. deceleration torque with the Inverter driving [N·m] T L : Required driving torque [N·m] L S Deceleration Time T B M M L B T T N J J T 9.55 = ( + ) ( ) + L B For short-time deceleration, use a braking unit (optional). 4-9 Parameter No. Function name Data Default setting Unit P031 Acceleration/deceleration time input type 00: Input via the Digital Operator 01: Input via option 1 02:
Input via option 2 00 Related functions A004, A204, A304, P031, C001 to C008 Actual acceleration time Actual deceleration time F003/F203/F303 Actual deceleration time