Speed control under Real sensorless vector control, vector control, PM sensorless vector
5.3.8
Torque bias
The torque bias function can be used to make the starting torque start-up faster. At this time, the motor starting torque
can be adjusted with a contact signal or analog signal.
Pr.
Name
840
Torque bias selection
G230
841
Torque bias 1
G231
842
Torque bias 2
G232
843
Torque bias 3
G233
844
Torque bias filter
G234
845
Torque bias operation
G235
time
846
Torque bias balance
G236
compensation
847
Fall-time torque bias
G237
terminal 1 bias
848
Fall-time torque bias
G238
terminal 1 gain
Block diagram
Speed command
Torque bias selection 1
Torque bias selection 2
Sensorless
Sensorless
Sensorless
Sensorless
Sensorless
Sensorless
Sensorless
Sensorless Vector
Sensorless
Vector
Vector
Initial
Setting
value
range
0
1
2
9999
3
24
25
9999
600 to
999%
1000 to
9999
1400%
9999
0 to 5 s
9999
9999
0 to 5 s
9999
9999
0 to 10 V
9999
9999
0 to 400%
9999
9999
0 to 400%
9999
9999
Speed
Speed command
+
control
P gain
-
Internal parameters
X42
[Pr. 841]
[Pr. 842]
X43
[Pr. 843]
SD
+
-
[Pr. 846]
Description
Set the torque bias amount using contact signals (X42, X43) in
Pr.841 to Pr.843.
Set the torque bias amount using terminal 1 in any of Pr.919 and
Pr.920. (When the squirrel cage rises during forward motor
rotation.)
Set the torque bias amount using terminal 1 in any of Pr.919 and
Pr.920. (When the squirrel cage rises during reverse motor
rotation.)
The torque bias amount using terminal 1 can be set automatically
in Pr.919, Pr.920 and Pr.846 according to the load.
Torque bias command via PROFIBUS-DP communication (FR-
A8NP) (-400% to 400%)
Torque bias command via PROFIBUS-DP communication (FR-
A8NP) (-327.68% to 327.67%)
No torque bias, rated torque 100%
Negative torque bias amount (-400% to -1%)
Positive torque bias amount (0 to 400%)
No torque bias setting
The time until the torque starts up.
The same operation as 0 s.
The time for retaining the torque of the torque bias amount.
The same operation as 0 s.
Set the voltage for the balanced load.
The same operation as 0 V. (Fixed to 0 V/0%.)
The bias value setting in the torque command.
The same as during rising (Pr.919).
The gain value setting in the torque command.
The same as during rising (Pr.920).
+
+
+
+
Speed
control
integral time
0
Integration cleared to 0
[Pr. 845]
[Pr. 840 = 0]
[Pr. 840 = 1, 2, 3]
CW
Cage
[Pr. 919]
[Pr. 920]
CW > Cage
control
Torque
IM
control
PLG
Cage
[Pr. 826]
Torque setting filter 1
Terminal 1
Load
detector
PARAMETERS
CW
5
175