Mitsubishi Electric 800 Series Instruction Manual page 178

Speed control under Real sensorless vector control, vector control, PM sensorless vector
Setting the torque bias amount automatically using terminal 1
(Pr.840="3", Pr.846)
• The settings of Pr.919 Terminal 1 bias command (torque), Pr.919 Terminal 1 bias (torque), Pr.920 Terminal 1 gain
command (torque), Pr.920 Terminal 1 gain (torque) and Pr.846 Torque bias balance compensation can be set
automatically according to the load.
• To set the torque bias amount with a voltage input to terminal 1, set Pr.868 Terminal 1 function assignment="6".
• Set the terminal 1 to accept inputs of load detection voltage, set "3" in Pr.840 Torque bias selection, and adjust the
parameter settings following the procedures below.
• Setting Pr.919
Drive with no load
• Setting Pr.920
Drive under the
maximum load
• Setting Pr.846
Drive with a balanced
load
NOTE
• To perform a torque bias operation after the automatic setting is completed, set Pr.840 to "1" or "2".
Torque bias command via PROFIBUS-DP communication (Pr.840 = "24 or
25")
• A torque bias command value can be set using the FR-A8NP (PROFIBUS-DP communication).
Pr.840
Torque bias command input
setting
Torque bias command from the buffer
24
memory of PROFIBUS (REF1 to 7)
Torque bias command from the buffer
25
memory of PROFIBUS (REF1 to 7)
NOTE
• For the details of FR-A8NP setting, refer to the Instruction Manual of FR-A8NP.
When the speed
stabilizes, read Pr.919
When the speed
stabilizes, read Pr.920
Read Pr.846
Setting range
600 to 1400
(-400% to 400%)
-32768 to 32767 (complement of 2)
(-327.68% to 327.67%)
[SET]
Press .
(Pr.919 setting
completed)
[SET]
Press .
(Pr.920 setting
completed)
[SET]
Press .
The torque balance
compensation for
power driving is
completed.
Setting
increments
1%
0.01%
PARAMETERS
control
The load input at no
load is set as the
terminal 1 bias, and a
terminal 1 bias
command is
automatically set
according to the load.
The load input at the
maximum load is set
as the terminal 1 gain,
and a terminal 1 gain
command is
automatically set
according to the load.
The load input at a
balanced load is
automatically set as a
torque bias balance
compensation for
power driving.
5
177