SPC Series Solar Pump Inverter Function parameter list
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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 to the torque
loads such as fans and water pumps.
You can adjust according to the
characteristics of the loads to achieve
best performance.
5: Customized V/F (V/F separation); in
this mode, V can be separated from F
and F can be adjusted through the
frequency 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 (1.3 order)
Torque step-down V/F curve (1.7 order)
Torque step-down V/F curve (2.0 order)
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 in space voltage vector
control mode.
You need to select torque boost based on
the load. For example, larger load
requires larger torque boost, however, if
the torque boost is too large, the motor
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