Mitsubishi Electric FR-A800 Series Instruction Manual page 267

 Block diagram
Speed command
Torque bias selection 1
Torque bias selection 2
 Setting the torque bias amount using contact input (Pr.840 = "0", Pr.841
to Pr.843)
• Select the torque bias amount shown in the following table using the corresponding contact signal combination.
• To input the X42 signal, set "42" in any of Pr.178 to Pr.189 (Input terminal function selection) to assign the function to
a terminal, and to input the X43 signal, set "43".
Torque bias selection 1
(X42)
OFF
ON
OFF
ON
When Pr.841 = "1025", the torque bias is 25%. When Pr.842 = "975", the torque bias is -25%. When Pr.843 = "925", the torque
bias is -75%.
NOTE
• 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.
 Setting the torque bias amount using terminal 1 (Pr.840 ="1, 2", Pr.847,
Pr.848)
• Calculate the torque bias from the load input to terminal 1 as shown in the following diagram, and then apply the torque
bias.
• To set the torque bias amount with a voltage input to terminal 1, set Pr.868 Terminal 1 function assignment ="6".
266
5. PARAMETERS
5.3 Speed control under Real sensorless vector control, vector control, PM sensorless vector control
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Speed command
+
-
Internal parameters
X42
[Pr. 841]
[Pr. 842]
X43
[Pr. 843]
SD
Torque bias selection 2
(X43)
OFF
OFF
ON
ON
search engine
Speed
+
control
P gain
Speed
control
integral time
0
Integration cleared to 0
[Pr. 845]
[Pr. 840 = 0]
CW
C16, C17
+
[Pr. 919]
-
C18, C19
[Pr. 846]
CW > Cage
[Pr. 920]
Torque bias amount
0%
Pr.841 -400% to +400% (Setting value: 600 to
1400%)
Pr.842 -400% to +400% (Setting value: 600 to
1400%)
Pr.843 -400% to +400% (Setting value: 600 to
1400%)
+
Torque
M
control
+ +
PLG
[Pr. 840 = 1, 2, 3]
Cage
[Pr. 826]
Torque setting filter 1
Terminal 1
Load
detector
CW
Cage