Detailed Function Description
51
Figure6.8 V/F curve diagram.
Function
Code
Name Description
Setting
Range
Factory
Setting
P4.01 Torque boost
0.0%: (auto)
0.1%~10.0%
0.0~10.0 0.0%
P4.02
Torque boost
cut-off
0.0%~50.0% (motor
rated frequency)
0.0~50.0 20.0%
Torque boost will take effect when output frequency is less than cut-off frequency of
torque boost (P4.02). Torque boost can improve the torque performance of V/F control at
low speed.
The value of torque boost should be determined by the load. The heavier the load, the
larger the value.
Notice: P4.01 should not be too large, otherwise the motor would be over-heat or
the inverter would be tripped by over-current or over-load.
If P4.01 is set to be 0, the inverter will boost the output torque according to the load
automatically.
Please refer to following diagram.
Figure 6.9 Manual torque boost diagram.
Function
Code
Name Description
Setting
Range
Factory
Setting
P4.03
V/F Slip
compensation limit
0.00~200.0% 0.00~200.00 0.0%
The slip compensation function calculates the torque of motor according to the output
current and compensates for output frequency. This function is used to improve speed
accuracy when operating with a load. P4.03 sets the slip compensation limit as a
percentage of motor rated slip, with the motor rated slip taken as 100%.
Function Name Description Setting Factory