Mitsubishi FR-A740-00023-EC - Torque Biases (Pr. 840 to Pr. 848)

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
01
, 2 , 3
X43
SD
Pr. 826
Torque setting filter 1
-
+