Mitsubishi Electric FR-A820-00046 Instruction Manual page 324

Speed control under Real sensorless vector control, vector control, PM sensorless vector control
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)
Drive with no load
● Setting C18, C19 (Pr. 920)
Drive under the
maximum load
● Setting Pr. 846
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 setting
24
25
Tab. 5-43:
NOTE For the details of FR-A8NP setting, refer to the Instruction Manual of FR-A8NP.
5 - 122
When the speed
stabilizes, read C16,
When the speed
stabilizes, read C18,
Drive with a
Torque bias command
input
Torque bias command from
the buffer memory of
PROFIBUS (REF1 to 7)
Torque bias selection via PROFIBUS-DP
Press the SET key.
(C16, C17 (Pr. 919)
C17 (Pr. 919)
setting completed)
Press the SET key.
(C18, C19 (Pr. 920)
C19 (Pr. 920)
setting completed)
Press the SET key.
The torque balance
Read Pr. 846
compensation for
power driving is
Setting range
600 to 1400
(-400% to 400%)
-32768 to 32767
(complement of 2)
(-327.68% to 327.67%)
The load input at no
load is set as the
terminal 1 bias, and a
terminal 1 bias
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
automatically set
according to the load.
The load input at a
balanced load is
automatically set as a
torque bias balance
compensation for
completed.
power driving.
Setting increments
1%
0.,01%
Parameters
command is
command is