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4-95
SLV Mode (Sensorless Vector Control)
Enter the motor data in parameter group 17 for SLV control mode (00-00) and perform auto-tuning.
In the SLV mode the V/F curve normally does not have to be re-adjusted after a successful auto-tune.
The maximum output frequency setting 01-02 (Fmax), base frequency 01-12 (Fbase), minimum output frequency
01-08 (Fmin), maximum output voltage 01-03 (Vmax) or base output voltage 01-13 (Vbase) can be adjusted but
the voltage is automatically adjusted by the internal current controller.
Set the base frequency (01-12, Fbase) to the motor rated frequency on the motor nameplate.
Perform the auto-tuning procedure after adjusting parameters 02-19 or 17-04 to reduce the voltage at no-load
operation.
Motor jitter can be reduced by lowering the no-load voltage. Please note that lowering the no-load voltage
increases the current at no-load.
Output Voltage (V)
Vmax
Vmid2
Vmin
Fmid2
(01- 04)
Fbase
( 01 - 12
Fmax
( 01 - 02 )
Vmid1
Fmid1
( 01 - 06)
Fmin
(01- 08)
)
Figure 4.3.13 Torque Boost / Compensation
01-10
Torque compensation gain
Range
【
0.0~2.0
】
01-11
Selection of Torque Compensation Mode
Range
0:
Mode 0
1:
Mode 1
Torque compensation gain (01-10)
In V/F mode the inverter automatically adjusts the output voltage to increase output torque during start or during
load changes based on the calculated loss of the motor voltage.
Torque compensation gain (01-10) can be adjusted at run time. There is no need to adjust torque compensation
gain except in the following cases:
Wire length between inverter and motor is too long, increase value of 01-10
Motor rating is smaller than inverter rating, increase value of 01-10.
Motor vibration, reduce value of 01-10
Refer to the torque compensation gain adjustment graph shown in Figure 4.3.14 for more information.