INVT GD270-030-4 - Page 156

Goodrive270 series VFD for fan and pump Function parameter list
-146-
Function
code
Name Description Default
Modify
torque loads
1: Multi
-point V/F curve
2: Torque
-down V/F curve (power of 1.3)
3: Torque
-down V/F curve (power of 1.7)
4: Torque
-down V/F curve (power of 2.0)
Curves 2
±4 are applicable for torque-variable
loads such as fan, pump and similar equipment.
You can make adjustment based on load
characteristics to achieve optimal energy
-
saving
effect.
5: Customized V/F (V/F separation); in this
mode, V can be separated from F and F can be
adjusted through the fr
equency setting channel
set by
P00.06 or the voltage setting channel set
by
P04.27 to change the characteristics of the
curve.
Note: In the following figure, V
b
is the motor
rated voltage and f
b
is the motor rated
frequency.
Output voltage
Output frequency
Linear type
Square type
Torque step-down V/F curve (power of 1.3)
Torque step-down V/F curve (power of 1.7)
Torque step-down V/F curve (power of 2.0)
V
b
f
b
P04.01
Torque boost of
motor 1
In order to compensate for low
-
frequency torque
characteristics, you can make some boost
compensation for the output voltage.
P04.01 is
relative to the max. output voltage V
b
.
P04.02
defines the percentage of cut-off
frequency of manual torque boost to the rated
motor frequency f
b
. Torque boost can improve
the low
-frequency torque characteristics of V/F.
You need to select torque boost based on the
load. For example, large
r load requires larger
torque boost, however, if the torque boost is too
large, the motor will run at over
-
excitation, which
may cause increased output current and motor
overheating, thus decreasing the efficiency.
0.0% ƻ
P04.02
Torque boost cut-
off
of motor 1
20.0% ƻ