Mitsubishi Electric FR-A820-00046 Instruction Manual page 248

Control method
NOTES To perform driving in a better accuracy, perform offline auto tuning, then set the online auto tun-
ing, and select Real sensorless vector control.
Under this control, rotations are more likely to be uneven than under V/F control. (This control
method is not suitable for grinder, wrapping machine, etc., which require even rotation at a low
speed.)
For FR-A820-03160(55K) or lower and FR-A840-01800(55K) or lower, the operation with a surge
voltage suppression filter (FR-ASF-H/FR-BMF-H) installed between the inverter and the motor may
reduce the output torque.
The optional sine wave filter (MT-BSL/BSC) cannot be used between the inverter and the motor.
Changing the terminal assignment using Pr. 178 to Pr. 189 (input terminal function selection) may
affect the other functions. Set parameters after confirming the function of each terminal.
Keeping the motor speed constant when the load fluctuates (speed control gain)
Pr.
89
G932
569
G942
● Use Pr. 89 to keep the motor speed constant during variable load operation.
(This parameter is useful to make adjustments on the motor speed after replacing a conventional
model with an FR-A800 series model.)
5 - 68
Name
Speed control gain
(Advanced magnetic flux
vector)
Second motor speed
control gain
Speed
Initial Setting
Description
value range
Makes adjustments to keep the motor speed
constant during variable load operation under
0 to 200%
Advanced magnetic flux vector control.
9999
The reference value is 100%.
The gain set by Pr. 71. (The gain set in accordance
9999
with the motor.)
Makes adjustments to keep the second motor speed
constant during variable load operation under
0 to 200%
Advanced magnetic flux vector control.
9999
The reference value is 100%.
The gain set by Pr. 450. (The gain set in accordance
9999
with the motor.)
Fig. 5-7:
Adjusting speed fluctuations
Parameters
I002504E