Torque Boost - INVT Goodrive350 Series Operation Manual

Goodrive350 series high-performance multi-function inverter
GD350 inverter provides multiple kinds of V/F curve modes to meet different field needs. Users can
select corresponding V/F curve or set the V/F curve as needed.
Suggestions:
1. For the load featuring constant moment, eg, conveyor belt which runs in straight line, as
the moment should be constant during the whole running process, it is recommended to
adopt straight-type V/F curve.
2. For the load featuring decreasing moment, eg, fan and water pump, as the relation
between its actual torque and speed is squared or cubed, it is recommended to adopt the V/F
curve corresponds to power 1.3, 1.7 or 2.0.
GD350 inverter also provides multi-point V/F curve. Users can alter the V/F curve outputted by
inverter through setting the voltage and frequency of the three points in the middle. The whole curve
consists of five points starting from (0Hz, 0V) and ending in (fundamental motor frequency, rated
motor voltage). During setup, it is required that 0≤f1≤f2≤f3≤fundamental motor frequency, and
0≤V1≤V2≤V3≤rated motor voltage
GD350 inverter provides dedicated function codes for SVPWM control mode. Users can improve the
performance of SVPWM through settings.
1.

Torque boost

Torque boost function can effectively compensate for the low-speed torque performance during
SVPWM control. Automatic torque boost has been set by default to enable the inverter to adjust the
torque boost value based on actual load conditions.
Note:
(1) Torque boost is effective only under torque boost cut-off frequency;
Output voltage
V
b
Straight-type
Output voltage
100 % V
b
V3
V2
V1
f1
Torque -down V/F curve (1.3
Torque -down V/F curve (1.7
Torque -down V/F curve (2.0
Square-type
Output frequency
f
b
Output frequency
f
f2 f3
b
-57-
th
order)
th
order)
th
order)
Hz
Chapter 5