GD350A series high-performance multifunction VFD
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b
f
b
V
Output voltage
Output frequency
Straight-type
Torque -down V/F curve (power of 1.3)
Square-type
Torque -down V/F curve (power of 1.7)
Torque -down V/F curve (power of 2.0)
The VFD also provides multi-point V/F curves. You can change the V/F curves output by the VFD by
setting the voltage and frequency of the three points in the middle. A whole curve consists of five points
starting from (0Hz, 0V) and ending at (motor fundamental frequency, motor rated voltage). During
setting, follow the rule: 0 ≤ f1 ≤ f2 ≤ f3 ≤ Motor fundamental frequency, and, 0 ≤ V1 ≤ V2 ≤ V3 ≤ Motor
rated voltage
b
f
Output voltage
f1
f2
f3
V1
V2
V3
b
V
%
100
Output frequency
Hz
The VFD provides dedicated function codes for the space voltage control mode. You can improve the
space voltage control performance by means of setting.
The VFD provides dedicated function codes for the space voltage control mode. You can 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:
