Torque Biases (Pr. 840 To Pr. 848) - Mitsubishi Electric FR-A720-00030-NA Instruction Manual

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/FR-A7AL (option) is mounted.
(1) Block diagram
Speed command
Torque bias selection 1
Torque bias selection 2
Initial Value Setting Range
9999
9999 1000 to 1400%
9999
9999
9999
9999
9999
Speed
Speed command
+
control
P gain
-
Internal parameters
X42
[Pr. 841]
[Pr. 842]
X43
[Pr. 843]
+
-
[Pr. 846]
Speed control by Real sensorless vector
Vector Vector Vector
Set the torque bias amount with the contact signal
0
(X42, X43) using Pr. 841 to Pr. 843.
Set the terminal 1-based torque bias amount as
1 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
2 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
3 set automatically in C16 to C19, Pr. 846 according
to the load.
9999 Without torque bias, rated torque 100%
600 to 999% Negative torque bias amount (-400% to -1%)
Positive torque bias amount (0% to 400%)
9999 Without torque bias setting
0 to 5s Time until torque rises.
9999 Same operation as when 0s is set.
Time for maintaining torque equivalent to the
0 to 5s
torque bias amount.
9999 Same operation as when 0s is set.
0 to 10V Set the voltage under balanced load.
9999 Same operation as when 0V is set.
0 to 400% Set the bias value of the torque command.
9999 Same as at a rise time (C16, C17 (Pr. 919)).
0 to 400% Set the gain value of the torque command.
9999 Same as at a rise time (C18, C19 (Pr. 920)).
+ +
+ +
Speed
control
integral time
0
Integration cleared to 0
[Pr. 845]
[ Pr. 840 = 0 ]
C16, C17
CW Cage
[Pr. 919]
C18, C19
CW > Cage
[Pr. 920]
control, vector control
Description
Torque
IM
control
Encoder
Cage
[Pr. 840 = 1, 2, 3]
[Pr. 826]
Torque setting filter 1
Terminal 1
Load
detector
CW
4
113