Mitsubishi Electric FR-A720-0.4K Instruction Manual page 123

(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 Torque Bias
Selection 1 Selection 2
(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. Make
setting 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 from terminal 1 as shown in the diagram below and provide torque bias.
⋅ When torque bias amount is set from 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
Voltage for
C16(Pr. 919)
balanced load
Pr. 846
Bias amount
Torque command
terminal 1 bias
C16(Pr. 919)
2
C17(Pr. 919)
Torque command
terminal 1 gain
C18(Pr. 920)
(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%
Fall-time
torque bias
terminal 1
bias
Terminal 1
Pr. 848
input
Fall-time
Voltage for
torque bias
max. load
terminal 1
C19(Pr. 920)
gain
Pr. 847
Voltage for
Fall-time
balanced load
torque bias
Pr. 846 Voltage for
terminal 1
max. load bias
Pr. 847
C19(Pr. 920)
Terminal 1
Fall-time
input torque bias
terminal 1
gain
Pr. 848
Speed control by real sensorless vector
Torque Bias Amount
0%
when Pr. 843 = 925, -75%
Fall (Motor Reverse Rotation)
Bias amount
C17(Pr. 919)
Terminal 1
input
Voltage for
max. load
Voltage for C19(Pr. 920)
balanced load
Pr. 846
Bias amount
Voltage for
balanced load
Voltage for
Pr. 846
max. load
C19(Pr. 920)
Terminal 1
C17(Pr. 919) input
control, vector control
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