Mitsubishi Electric FR-A800 Series Instruction Manual page 269

• Set the terminal 1 to accept inputs of load detection voltage, set "3" in Pr.840 Torque bias selection, and adjust the
parameter settings according to the following procedures.
Setting C16, C17 (Pr.919)
Drive with no load
Setting C18, C19 (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
Method to give torque bias command
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 details on the FR-A8NP setting, refer to the Instruction Manual of the FR-A8NP.
 Torque bias operation (Pr.844, Pr.845)
• The torque start-up can be made slower by setting Pr.844 Torque bias filter ≠ "9999". The torque start-up operation at
this time is the time constant of the primary delay filter.
268
5. PARAMETERS
5.3 Speed control under Real sensorless vector control, vector control, PM sensorless vector control
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When the speed
stabilizes, read C16,
C17 (Pr.919)
When the speed
stabilizes, read C18,
C19 (Pr.920)
Read Pr.846
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Press
(C16, C17 (Pr.919)
setting completed)
Press
(C18, C19 (Pr.920)
setting completed)
Press
The torque balance
compensation for
power driving is
completed.
Setting range
600 to 1400 (-400% to 400%)
-32768 to 32767 (two's
complement)
(-327.68% to 327.67%)
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.
Setting
increments
1%
0.01%