Set the motor overheat protection (Pr.9). (Refer to
Set the motor capacity and the number of motor poles (Pr.80 and Pr.81). (Refer to
V/F control is performed when the setting is "9999" (initial value).
Set the rated motor voltage and frequency (Pr.83 and Pr.84). (Refer to
Select the control method (Pr.800). (Refer to
Select Pr.800 Control method selection = "11" (torque control) or "12" (speed/torque switchover) to enable torque
Set the torque command (Pr.804). (Refer to
Set the speed limit (Pr.807). (Refer to
Perform the offline auto tuning (Pr.96). (Refer to
Perform the test operation.
• Select online auto tuning (Pr.95). (Refer to
• Adjust the torque control gain manually. (Refer to
• During Real sensorless vector control, offline auto tuning must be performed properly before starting operations.
• The carrier frequency is limited during Real sensorless vector control. (Refer to
• Torque control is not available in a low-speed (about 10 Hz or lower) regenerative range, or with a low speed and light load
(about 5 Hz or lower and rated torque about 20% or lower).
• Performing pre-excitation (LX signal and X13 signal) under torque control may start the motor running at a low speed even
when the start signal (STF or STR) is not input. The inverter at a start command ON may also rotate the motor at a low speed
even though a speed limit value is set to 0. Confirm that the motor running does not cause any safety problem before
• Switching between the forward rotation command (STF) and reverse rotation command (STR) must not be performed during
operations under torque control. An overcurrent trip (E.OC) or opposite rotation deceleration fault (E.11) will occur.
• When performing continuous operations under Real sensorless vector control in FR-A820-00250(3.7K) or lower or FR-A840-
00126(3.7K) or lower, the speed fluctuation increases when the value is 20 Hz or less, and in the low-speed range of less than
1 Hz, there may be torque shortage. In such case, stop the inverter and restart it to improve the situation.
• If starting may occur while the motor is coasting under Real sensorless vector control, the frequency search must be set for
the automatic restart after instantaneous power failure function (Pr.57 ≠ "9999", Pr.162 = "10").
• When Real sensorless vector control is applied, there may not be enough torque provided in the ultra low-speed range of about
2Hz or lower.
Generally, the speed control range is as follows.
For power driving, 1:200 (2, 4 or 6 poles) (available at 0.3 Hz or higher when the rating is 60 Hz), 1:30 (8 or 10 poles) (available
at 60 Hz or higher when the rating is 2 Hz).
For regenerative driving, 1:12 (2 to 10 poles) (available at 5 Hz or higher when the rating is 60 Hz).
Setting procedure for Vector control (torque
Perform secure wiring. (Refer to
Install a Vector control compatible option.
Set the option to be used (Pr.862).
Set Pr.862 Encoder option selection according to the option to be used. (Refer to
Set the motor and the encoder (Pr.71, Pr.359 (Pr.852), and Pr.369 (Pr.851)). (Refer to
5.4 Torque control under Real sensorless vector control and Vector control