4-97
Figure 4.3.12 Custom V/F Curve
For low torque or high speed applications, the motor may overheat. Make sure to provide
adequate cooling when operating the motor under these conditions for a longer period of time
If the automatic torque boost function is enabled (parameter 01-10), the applied motor voltage
will automatically change to provide adequate motor torque during start or operating at low
frequency.
SLV Mode (Sensorless Vector Control)
In the SV and 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.
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.
Set the base frequency (01-12, Fbase) to the motor rated frequency on the motor nameplate.
Figure 4.3.13 Torque Boosting
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