Mitsubishi FR-A800

Speed control under Real sensorless vector control, vector control, PM sensorless vector
control
204
PARAMETERS
Setting the torque bias amount automatically using terminal 1
(Pr.840="3", Pr.846)
• The settings of C16 Terminal 1 bias command (torque), C17 Terminal 1 bias (torque), C18 Terminal 1 gain command
(torque), C19 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 C16, C17 (Pr.919)
• Setting C18, C19 (Pr.920)
• Setting Pr.846
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).
NOTE
• For the details of FR-A8NP setting, refer to the Instruction Manual of FR-A8NP.
Drive with no load
When the speed
stabilizes, read C16,
C17 (Pr.919)
Press .
(C16, C17 (Pr.919)
setting completed)
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.
Drive under the
maximum load
When the speed
stabilizes, read C18,
C19 (Pr.920)
Press .
(C18, C19 (Pr.920)
setting completed)
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.
Drive with a balanced
load
Read Pr.846
Press .
The torque balance
compensation for
power driving is
completed.
The load input at a
balanced load is
automatically set as a
torque bias balance
compensation for
power driving.
Pr.840
setting
Torque bias command input Setting range
Setting
increments
24
Torque bias command from the buffer
memory of PROFIBUS (REF1 to 7)
600 to 1400
(-400% to 400%)
1%
25
Torque bias command from the buffer
memory of PROFIBUS (REF1 to 7)
-32768 to 32767 (complement of 2)
(-327.68% to 327.67%)
0.01%