Torque Bias - Mitsubishi Electric 800 Series Instruction Manual (Function

5.7

Torque bias

Sensorless Sensorless Sensorless Vector Vector Vector
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 4 bias
848 Fall-time torque bias
G238 terminal 4 gain
 Block diagram
Speed command
Speed command
Torque bias
X42
selection 1
X43
Torque bias
selection 2
SD
 Setting the torque bias amount using contact input (Pr.840 = "0", Pr.841
to Pr.843)
• Select the torque bias amount shown in the following table using the corresponding contact signal combination.
Setting
Initial value
range
0
1
9999
2
3
9999
600% to
999%
1000% to
9999
1400%
9999
0 to 5 s
9999
9999
0 to 5 s
9999
9999
0% to 100%
9999
9999
0% to 400%
9999
9999
0% to 400%
9999
9999
Speed
+
control
P gain
-
0
[Pr. 845]
Internal parameters
[Pr. 841]
[Pr. 842]
[Pr. 843]
+
-
[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 4 in any of C38 to C41.
(When the squirrel cage rises during forward motor rotation.)
Set the torque bias amount using terminal 4 in any of C38 to C41.
(When the squirrel cage rises during reverse motor rotation.)
The torque bias amount using terminal 4 can be set automatically in
C38 to C41 and Pr.846 according to the load.
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 input voltage/current at a balanced load in %, considering the
full-scale value of the voltage input via terminal 4 as 100%.
The same operation as 0 V. (Fixed to 0 V/0%.)
The bias value setting in the torque command.
The same as (C38, C39 (Pr.932)) when ascending
The gain value setting in the torque command.
The same as (C40, C41 (Pr.933)) when ascending
Torque limit
+ +
+ +
Speed
control
integral time
Integration cleared to 0
[Pr. 840 = 0] [Pr. 840 = 1, 2, 3]
CW Cage
C38, C39
[Pr. 932]
[Pr. 826]
C40, C41 Torque setting filter 1
CW > Cage
[Pr. 933]
Torque
IM
control
PLG
Cage
Terminal 4
Load
detector
5. Speed Control
5.7 Torque bias
1
2
3
4
5
6
7
8
9
10
CW
133