Mitsubishi Electric FR-A800, Instruction Manual

Page: 296 / 1042

Speed control under Real sensorless vector control, vector control, PM sensorless vector control Parameters
5 - 116
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
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).
Drive with no load
When the speed
stabilizes, read C16,
C17 (Pr. 919)
Press the SET key.
(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 the SET key.
(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 SET key.
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.
NOTE To perform a torque bias operation after the automatic setting is completed, set Pr. 840 to "1" or
"2".
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
-32768 to 32767
(complement of 2)
(-327.68% to 327.67%)
0.,01%
Tab. 5-43: Torque bias selection via PROFIBUS-DP
NOTE For the details of FR-A8NP setting, refer to the Instruction Manual of FR-A8NP.