Torque Bias - Mitsubishi Electric FR-A800 Series 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
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.
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
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selectionpage 233
Torque bias
Name Initial value
9999
9999
9999
9999
9999
9999
9999
5.3 Speed control under Real sensorless vector control, vector control, PM sensorless vector control
search engine
Easy gain tuning selection (Pr.819) setting
0 1
The inertia ratio value
calculated by easy gain
tuning is displayed. Manual
input is available only during
a stop.
The tuning result is
displayed. Write is not
available.
The tuning result is
displayed. Write is not
available.
The tuning result is
displayed. Write is not
available.
Manual input
2page 254
2page 254
Setting
range
Set the torque bias amount using contact signals (X42, X43) in Pr.841
0
to Pr.843.
Set the torque bias amount using terminal 1 in any of C16 to C19.
1
(When the squirrel cage rises during forward motor rotation.)
Set the torque bias amount using terminal 1 in any of C16 to C19.
2
(When the squirrel cage rises during reverse motor rotation.)
The torque bias amount using terminal 1 can be set automatically in
3
C16 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 999% Negative torque bias amount (-400% to -1%)
1000 to
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 The same operation as 0 s.
0 to 5 s The time for retaining the torque of the torque bias amount.
9999 The same operation as 0 s.
0 to 10 V Set the voltage for the balanced load.
9999 The same operation as 0 V. (Fixed to 0 V/0%.
0 to 400% The bias value setting in the torque command.
9999 The same as (C16, C17 (Pr.919)) when ascending
0 to 400% The gain value setting in the torque command.
9999 The same as (C18, C19 (Pr.920)) when ascending
2
Manual input
The tuning result is
displayed.
Write is not available.
The tuning result is
displayed.
Write is not available.
The tuning result is
displayed.
Write is not available.
Manual input
Description
5. PARAMETERS
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