The User Manual of JAC200 Series General Frequency Converter
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Fig. 6-4 Multi-point V/F curve setting diagram
F3-09
VF slip compensation gain
Default value
0.0%
Set range
0%
～
200.0%
This parameter only takes effect for the asynchronous motor.
VF slip compensation can compensate motor speed deviation when the load of asynchronous motor is
increased so that motor speed can be stable in load change.
VF slip compensation gain set in 100.0% means that the compensated slip is motor rated slip frequency
when the motor has rated load. The frequency converter will calculate motor rated slip through motor rated
frequency and rated speed in Group F1 automatically.
When VF slip compensation gain is adjusted, the principle is that motor speed is basically the same as target
speed in rated load. When motor speed is different from target speed, it is required to conduct the fine
adjustment of this gain appropriately.
F3-10
VF overexcitation gain
Default value
64
Set range
0
～
200
When the frequency converter is in deceleration, the overexcitation control will suppress bus voltage rise to
prevent overvoltage failure. The suppression effect will be heightened as overexcitation gain gets increases.
Overexcitation gain shall be enhanced in the field where overvoltage alarm may occur when the frequency
converter is in deceleration. However, too high overexcitation gain may result in increasing output current
so the balance is required in application.
For the field with quite low inertia, the voltage rise will not occur when the motor is in deceleration, thus, it
is recommended that overexcitation gain be set to 0; for the field with brake resistance, it is recommended
that overexcitation gain be also set to 0.
F3-11
VF oscillation suppression
gain
Default value
Model dependent
Set range
0
～
100
