Mitsubishi Electric FR-A720-00030-NA Instruction Manual page 125

Speed control by Real sensorless vector
control, vector control
(2) Setting torque bias amount with the contact input (Pr. 840 = "0")
 Select the torque bias amount in the table below according to the combination of contact signals.
 Set "42" in Pr. 178 to Pr. 189 (input terminal function selection) for the terminal used for X42 signal input and set "43" for
the terminal used for X43 signal input to assign functions.
Torque Bias
Selection 1
(X42)
OFF
ON
OFF
ON
Example) when Pr. 841 = 1025, 25%
CAUTION
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.
(3) Setting torque bias amount with terminal 1 (Pr. 840 = "1, 2")
 Calculate torque bias from the load input to terminal 1 as shown in the diagram below and provide torque bias.
 To set torque bias amount by the voltage input to terminal 1, set "6" in Pr. 868 Terminal 1 function assignment.
Pr. 840
Rise (Motor Forward Rotation)
Setting
Bias amount
Torque command
terminal 1 gain
C18(Pr. 920)
C17(Pr. 919)
1
Torque command
terminal 1 bias
C16(Pr. 919)
Bias amount
Torque command
terminal 1 bias
C16(Pr. 919)
2
C17(Pr. 919)
Torque command
terminal 1 gain
C18(Pr. 920)
114
Torque Bias
Selection 2
(X43)
OFF
OFF Pr. 841 -400% to +400% (setting value : 600 to 1400%)
ON Pr. 842 -400% to +400% (setting value : 600 to 1400%)
ON Pr. 843 -400% to +400% (setting value : 600 to 1400%)
when Pr. 842 = 975, -25%
Terminal 1
input
Voltage for
max. load
Voltage for C19(Pr. 920)
balanced load
Pr. 846
Voltage for
balanced load
Pr. 846
Voltage for
max. load
C19(Pr. 920)
Terminal 1
input
Torque Bias Amount
0%
when Pr. 843 = 925, -75%
Fall (Motor Reverse Rotation)
Bias amount
Fall-time
torque bias
terminal 1
bias
C17(Pr. 919)
Pr. 848
Voltage for
Fall-time
max. load
torque bias
Voltage for
C19(Pr. 920)
terminal 1
balanced load
gain
Pr. 846
Pr. 847
Bias amount
Fall-time
Voltage for
torque bias
balanced load
terminal 1
Voltage for
Pr. 846
bias
max. load
Pr. 847
C19(Pr. 920)
Fall-time
torque bias
C17(Pr. 919)
terminal 1
gain
Pr. 848
Terminal 1
input
Terminal 1
input