Torque Bias - Mitsubishi Electric FR-A820-00046 (0.4K) Instruction Manual

 Combining with easy gain tuning
• The following table shows the relationship between speed feed forward and model adaptive speed control, and the easy
gain tuning function.
Pr.880 Load inertia ratio .
Pr.820 Speed control P gain 1
Pr.821 Speed control integral time
1
Pr.828 Model speed control gain
Pr.881 Speed feed forward gain
Parameters referred to
Pr.820 Speed control P gain 1, Pr.830 Speed control P gain
Pr.821 Speed control integral time 1, Pr.831 Speed control integral time
Pr.788 Low speed range torque characteristic
5.3.8

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 1 bias
848 Fall-time torque bias
G238 terminal 1 gain
Easy gain tuning selection (Pr.819) setting
0
Manual input
Manual input
Manual input
Manual input
Manual input
2page 244
2page 244
selectionpage 227
Setting
Initial value
range
Set the torque bias amount using contact signals (X42, X43) in Pr.841 to
0
Pr.843.
Set the torque bias amount using terminal 1 in any of C16 to C19. (When
1
the squirrel cage rises during forward motor rotation.)
Set the torque bias amount using terminal 1 in any of C16 to C19. (When
2
the squirrel cage rises during reverse motor rotation.)
9999 The torque bias amount using terminal 1 can be set automatically in C16
3
to C19 and Pr.846 according to the load.
Torque bias command via PROFIBUS-DP communication (FR-A8NP) (-
24
400% to 400%)
Torque bias command via PROFIBUS-DP communication (FR-A8NP) (-
25
327.68% to 327.67%)
9999 No torque bias, rated torque 100%
600 to
Negative torque bias amount (-400% to -1%)
999%
1000 to
9999 Positive torque bias amount (0 to 400%)
1400%
9999 No torque bias setting
0 to 5 s The time until the torque starts up.
9999
9999 The same operation as 0 s.
0 to 5 s The time for retaining the torque of the torque bias amount.
9999
9999 The same operation as 0 s.
0 to 10 V Set the voltage for the balanced load.
9999
9999 The same operation as 0 V. (Fixed to 0 V/0%.
0 to 400% The bias value setting in the torque command.
9999
9999 The same as (C16, C17(Pr.919)) when ascending
0 to 400% The gain value setting in the torque command.
9999
9999 The same as (C18, C19(Pr.920)) when ascending
5.3 Speed control under Real sensorless vector control, vector control, PM sensorless vector control
1
The inertia ratio value
calculated by easy gain
tuning is displayed. Manual Manual input
input is available only during
a stop.
The tuning result is The tuning result is
displayed. Write is not displayed.
available. Write is not available.
The tuning result is The tuning result is
displayed. Write is not displayed.
available. Write is not available.
The tuning result is The tuning result is
displayed. Write is not displayed.
available. Write is not available.
Manual input Manual input
Description
1
2
2
3
4
5
6
7
8
9
10
255
5. PARAMETERS