Mitsubishi FR-A740-00023-EC, Instruction Manual

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108
Speed control by real sensorless vector
control, vector control
4.4.6 Torque biases (Pr. 840 to Pr. 848)
(1) Block diagram
This function accelerates the rise of the torque at a start. Adjust the torque at a motor start using the contact
signals or analog signals .
Parameter
Number
Name Initial Value Setting Range Description
840 Torque bias selection 9999
0
Set the torque bias amount with the contact signal
(X42, X43) using
Pr. 841 to Pr. 843 .
1
Set the terminal 1-based torque bias amount as
desired in
C16 to C19
. (in the case a cage goes up
when a motor runs reversely)
2
Set the terminal 1-based torque bias amount as
desired in
C16 to C19 . (in the case a cage goes up
when a motor runs forward)
3
The terminal 1-based torque bias amount can be
set automatically in
C16 to C19, Pr. 846 according
to the load.
9999 Without torque bias, rated torque 100%
841 Torque bias 1
9999
600 to 999% Negative torque bias amount (-400% to -1%)
842 Torque bias 2
1000 to 1400% Positive torque bias amount (0% to 400%)
843 Torque bias 3
9999 Without torque bias setting
844 Torque bias filter
9999
0 to 5s Time until torque rises.
9999 Same operation as when 0s is set.
845
Torque bias operation
time
9999
0 to 5s
Time for maintaining torque equivalent to the
torque bias amount.
9999 Same operation as when 0s is set.
846
Torque bias balance
compensation
9999
0 to 10V Set the voltage under balanced load.
9999 Same operation as when 0V is set.
847
Fall-time torque bias
terminal 1 bias
9999
0 to 400% Set the bias value of the torque command.
9999 Same as at a rise time (C16, C17 (Pr. 919)) .
848
Fall-time torque bias
terminal 1 gain
9999
0 to 400% Set the gain value of the torque command.
9999 Same as at a rise time (C18, C19 (Pr. 920)) .
The above parameters can be set when the FR-A7AP (option) is mounted.
Vector Vector Vector
Speed command
Torque bias selection 1
Torque bias selection 2
Pr. 846
C16, C17
(Pr. 919)
C18, C19
(Pr. 920)
Internal parameters
Pr. 841
Pr. 842
Pr. 843
HOLD
Speed command
CW < = Cage
CW > = Cage
Pr. 840
Speed
control
Torque
control
IM
Encoder
CW
Cage
Load
detector
Terminal 1
-
+
X42
0 1, 2, 3
X43
SD
Pr. 826
Torque setting filter 1
-
+