INVT Goodrive350 Series Operation Manual page 69

Goodrive350 IP55 High-ingress Protection Series VFD
improve the space voltage control performance by means of setting.
(1) Torque boost
The torque boost function can effectively compensate for the low-speed torque performance in
space voltage control. Automatic torque boost has been set by default, which enables the VFD
to adjust the torque boost value based on actual load conditions.
Note:

Torque boost takes effect only at the torque boost cut-off frequency.

If torque boost is too large, the motor may encounter low-frequency vibration or
overcurrent. If such a situation occurs, reduce the torque boost value.
(2) Energy-saving run
During actual running, the VFD can search for the max. efficiency point to keep running in the
most efficient state to save energy.
Note:

This function is generally used in light load or no-load cases.

This function is no applicable to the cases where sudden load changes often occur.
(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
Output voltage V
boost
cut-off
Output frequency f
-51-
Basic operation guidelines