Torque Biases (Pr. 840 To Pr. 848) - Mitsubishi Electric FR-A740-00023 Instruction Manual

Speed control by real sensorless vector
control, vector control
4.4.6

Torque biases (Pr. 840 to Pr. 848)

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