Mitsubishi Electric FR-A820-00046 Instruction Manual page 438

(F) Setting of acceleration/deceleration time and acceleration/deceleration pattern
NOTES Even if the optimum acceleration/deceleration has been selected, inputting the JOG signal (Jog
operation), RT signal (second function selection) or X9 signal (third function selection) during an
inverter stop will switch to the normal operation and give priority to JOG operation, second func-
tion selection or third function selection. Note that during operation, an input of JOG and RT sig-
nal does not have any influence even when the optimum acceleration/deceleration is enabled.
Because of the learning method, the impact of the optimum acceleration/deceleration is not
apparent in the first operation after setting to the optimum acceleration/deceleration mode.
The optimum value are calculated for only acceleration from 0 to 30 Hz or higher or deceleration
from 30 Hz or higher to 0 Hz.
The optimum acceleration/deceleration will not operate if the motor was not connected or the
output current is less than 5% of the rated current of the inverter.
A Regenerative overvoltage trip during deceleration or stop (E.OV3) may occur during decelera-
tion even if the optimum acceleration/deceleration is selected with Pr. 293 ="1 (optimum acceler-
ation/deceleration during acceleration only)" setting. In such case, set Pr. 8 setting longer.
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Parameters