Torque Bias - Mitsubishi Electric 800 Series Instruction Manual

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
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