INVT Goodrive350-19 Series Operation Manual page 158

Goodrive350-19 series VFD for crane
3. V/F slip compensation gain
Space voltage vector control belongs to an open-loop mode. Sudden motor load changes cause
motor speed fluctuation. In cases where strict speed requirements must be met, you can set the slip
compensation gain to compensate for the speed change caused by load fluctuation through VFD
internal output adjustment.
The setting range of slip compensation gain is 0–200%, in which 100% corresponds to the
rated slip frequency.
Note: Rated slip frequency = (Rated synchronous rotation speed of motor – Rated rotation
speed of motor) x (Number of motor pole pairs)/60
4. Oscillation control
Motor oscillation often occurs in space voltage vector control in large-power driving applications. To
solve this problem, the VFD provides two oscillation factor function codes. You can set the function
codes based on the oscillation occurrence frequency.
Note: A greater value indicates better control effect. However, if the value is too large, the VFD
output current may be too large.
5. AM I/F control
Generally, the I/F control mode is valid for AMs. It can be used for SMs only when the frequency is
extremely low. Therefore, the I/F control mode described in this manual is only involved with AMs.
The I/F control is implemented by performing closed-loop control on the total output current of the
VFD. The output voltage adapts to the current reference, and open-loop control is separately
performed over the frequency of the voltage and current.
Customized V/F curve (V/F separation) function:
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Basic operation guidelines