Mitsubishi Electric FR-A820-00046 (0.4K) Instruction Manual page 224

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 the FR-A820-03160(55K) or lower and the 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. Name
Speed control gain
89
(Advanced magnetic flux
G932
vector)
569 Second motor speed
G942 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 applied motor) is selected.
Refer to page 505.)
Function
Applied motor
Motor capacity
Number of motor poles
Speed control gain (Advanced magnetic flux
vector)
Control method selection
NOTE
• The RT signal is a Second function selection signal. The RT signal also enables other second functions. (Refer to
The RT signal is assigned to the terminal RT in the initial status. Set "3" in one 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 505
Pr.800, Pr.451 Control method selectionpage 215
Initial Setting
value range
Makes adjustments to keep the motor speed constant during variable load
0 to 200% operation under Advanced magnetic flux vector control. The reference
9999
value is 100%.
9999 The gain set by Pr.71. (The gain set in accordance with the motor.)
Makes adjustments to keep the second motor speed constant during
0 to 200% variable load operation under Advanced magnetic flux vector control. The
9999
reference value is 100%.
9999 The gain set by Pr.450. (The gain set in accordance with the motor.)
Speed
RT signal-ON (second motor)
Pr.450
Pr.453
Pr.454
Pr.569
Pr.451
Description
RT signal-OFF (first motor)
Pr.71
Pr.80
Pr.81
Pr.89
Pr.800
1
2
3
4
5
6
7
8
9
10
page 500.)
223
5. PARAMETERS
5.2 Control method