F2-03 Speed loop proportional gain 2 0–100 20
F2-04 Speed loop integral time 2 0.01–10.00s 1.00s
F2-05 Switchover frequency 2
F2-02 to maximum
output frequency
10.00 Hz
z If the running frequency is equal to or lower than the value of F2-02 (switchover
frequency 1), the speed loop PI parameters are F2-00 and F2-01.
z If the running frequency is equal to or higher than the value of F2-05 (switchover
frequency 2), the speed loop PI parameters are F2-03 and F2-04.
z If the running frequency is between the values of F2-02 and F2-05, the speed loop PI
parameters are the weighted average of F2-00, F2-01, F2-03 and F2-04, as shown in
the following figure.
Figure 6-1 PI parameters
The speed dynamic response characteristics in vector control can be adjusted by setting
the proportional gain and integral time of the speed regulator.
To achieve a faster system response, increase the proportional gain and reduce the
integral gain. Be aware that this may lead to system oscillation.
The recommended adjustment method is as follows:
If the factory settings cannot meet the requirement, make proper adjustment. Increase the
proportional gain first to ensure that the system does not oscillate, and then reduce the
integral time to ensure that the system has quick response and small overshoot.
Improper PI parameter setting may cause too large speed overshoot. Over-voltage fault may occur when
the overshoot drops.
Function Code Parameter Name Setting Range Default
F2-06 Vector control slip compensation coefficient 50%–200% 100%
For SFVC, this parameter is used to adjust the motor speed stability accuracy. When the
motor with load runs at too low speed, increase the value of this parameter; when the
motor with load runs at too large speed, decrease the value of this parameter.
For CLVC, this parameter is used to adjust the output current of the AC drive with same
load.
Function Code Parameter Name Setting Range Default
F2-07 Filter time constant of speed loop 0.000–0.100s 0.000s
In the vector control mode, the output of speed loop regulator is torque current command.
This parameter is used to filter the torque command. This parameter need not be adjusted
generally and this filter time can be increased in case of large speed fluctuation. In the
case of motor oscillation, decrease the value of this parameter properly.
If the filter time constant of speed loop is small, the output torque of the AC drive may
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