Mitsubishi FR-A800

Control method
PARAMETERS
171
5
NOTE
• To perform driving in a better accuracy, perform offline auto tuning, then set the online auto tuning, 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)
• 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.)
Driving two motors under Advanced magnetic flux vector control
• Turning ON the Second function selection (RT) signal enables the second motor operation.
• Set a second motor in Pr.450 Second applied motor. (In the initial setting, "9999 (no second motor)" is selected. Refer to
page 438.)
NOTE
• The RT signal is a second function selection signal. The RT signal also enables other second functions. (Refer to page 434.)
RT signal is assigned to the terminal RT in the initial status. Set "3" in any of Pr.178 to Pr.189 (input terminal function
selection) to assign the RT signal to another terminal.
• 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.
???????
Parameters referred to
Pr.71, Pr.450 Applied motor page 438
Pr.800, Pr.451 Control method selection page 164
Pr. Name
Initial
value
Setting
range
Description
89
G932
Speed control gain
(Advanced magnetic flux
vector)
9999
0 to 200%
Makes adjustments to keep the motor speed constant during variable
load operation under Advanced magnetic flux vector control.
The reference value is 100%.
9999 The gain set by Pr.71. (The gain set in accordance with the motor.)
569
G942
Second motor speed
control gain
9999
0 to 200%
Makes adjustments to keep the second motor speed constant during
variable load operation under Advanced magnetic flux vector control.
The reference value is 100%.
9999 The gain set by Pr.450. (The gain set in accordance with the motor.)
Function RT signal ON (second motor) RT signal OFF (first motor)
Applied motor Pr.450 Pr.71
Motor capacity Pr.453 Pr.80
Number of motor poles Pr.454 Pr.81
Speed control gain (Advanced magnetic flux vector) Pr.569 Pr.89
Control method selection Pr.451 Pr.800
Load torque
Speed