INVT Goodrive300 Series Operation Manual page 139

Goodrive300 Series VFD Basic operation instruction
1. Torque boost
Torque boost function can compensate the performance of low speed torque during SVPWM control.
The VFD will adjust the torque boost according to the actual load.
Note:
The torque boost takes effect only when the frequency is under the cap frequency of the boost.
If the torque boost is too big, low frequency vibration or overcurrent fault may occur. Please lower the
torque boost.
Output voltage
V
b
V
boost
Output frequency
f f
Cut-off b
2. Energy-saving running
In the actual operation, the VFD can search by itself to achieve a better effect point. The VFD can
work with high effect to save energy.
Note:
This function is usually used in the cases where the load is light or empty.
If the load transients frequently, this function is not appropriate to be slected.
3. V/F slips compensation gain
SVPWM control belongs to the open loop mode. If the load of the motor transients suddenly, the
fluctuation of the rotation speed may occur. In the cases where the high accuracy speed is needed,
slip compensation gain (internal output adjustment) can be set to compensate the speed change
caused by load fluctuation.
Setting range of slip compensation gain: 0–200%, of which 100% corresponds to the rated slip
frequency.
Note: Rated slip frequency= (rated synchronous rotation speed of the motor-rated rotation speed of
the motor) × number of pole pairs/60.
4. Vibration control
Motor vibration occurs frequently when applying SVPWM control mode in the cases where high
power is needed. In order to settle this problem, Goodrive300 series VFDs add two function codes
which are set to control the vibration factors. The user can set the corresponding function code
according to the vibration frequency.
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