Mitsubishi Electric FR-A820-00046 (0.4K), Instruction Manual

Page: 392 / 1218

Position control under vector control and PM sensorless vector control Parameters
5 - 190
Position feed forward gain (Pr. 423)
●
This function is designed to cancel a delay caused by the droop pulses in the deviation counter.
Set this parameter when a sufficient position response cannot be obtained after setting Pr. 422.
●
When a tracking delay for command pulses poses a problem, increase the setting gradually and
use this parameter within the range where an overshoot or vibration will not occur.
●
This function has no effects on servo rigidity at a stop.
●
Normally set this parameter to 0.
●
When setting Pr. 423, set Pr. 877 = "0 or 1" to enable position feed forward control.
Model adaptive position control (Pr. 446)
●
Set each response for position commands and for load and external disturbances individually.
●
Set this parameter when a sufficient position response cannot be obtained after setting Pr. 422.
●
When setting Pr. 446, set Pr. 877 = "2" to enable the model adaptive position control, Pr. 828 "Model
speed control gain"
≠
"0", and a load inertia ratio in Pr. 880 "Load inertia ratio".
●
Set a small value in Pr. 446 first, and then increase the setting gradually and use this parameter
within the range where an overshoot or vibration will not occur.