Powtran PI9100 Series Manual page 128

meet: V1 <V2 <V3, F1 <F2 <F3. The setting of multi-point V/F curve is as shown in below
figure.
In the sate of low frequency, if the voltage is set to a higher value, which may cause
motor overheating even burned, the inverter may appear overcurrent stall or overcurrent
protection.
Voltage%
V1-V3 ：多段速 V/F 第 1-3 段电压百分比
V1-V3: Voltage percentage of stage 1-3 to multi-speed V/F
Vb: Rated motor voltage
Vb ：电机额定电压
slip compensation
V/F
F4.09
gain
This parameter is valid only for asynchronous motors.
V/F slip compensation can compensate for the speed deviation of asynchronous motor
when the load increases, so as to keep stable speed when the load changes.
If V/F slip compensation gain is set to 100.0%, it means that the compensated deviation
is equal to the rated motor slip under the rated motor load mode, while the rated motor slip
can be calculated through b0 group of motor rated frequency and rated speed.
When adjusting V/F slip compensation gain, generally it is based on the principle that
the motor speed is same as the target speed. When the motor speed is different from target
value, it is necessary to appropriately fine-tune the gain.
F4.10
overexcitation gain
V/F
In the process of the inverter's deceleration, the over-excitation control can suppress the
rise of bus voltage to avoid overvoltage fault. The greater overexcitation gain, the stronger
the inhibitory effect.
For the occasions that the inverter's deceleration easily cause over pressure alarm , the
overexcitation gain needs to be improved. But if overexcitation gain is too large, which easily
lead to the increase of output current, you need to weigh in practical applications.
For the small inertia occasions that the inverter's deceleration will not cause voltage rise,
it is recommended to set overexcitation gain as 0; the set value is also suitable for the
occasions with braking resistor.
oscillation
V/F
F4.11
suppression gain
The method of selecting gain is take the value as smaller as possible with the premise
that effectively suppressing oscillation, in order to avoid the adverse affect caused by V/F
running. Please select 0 as the gain when the motor has not oscillation phenomenon. Only
Vb
V3
V2
V1
F1 F2
Schematic diagram of multi-point V/F curve setting
多点 V/F 曲线设定示意图
0% to 200.0%
0 to 200
0 to 100
Chapter 5 Function parameter
F3 Fb
F1-F3 ：多段速 V/F 第 1-3 段频率百分比
F1-F3: Frequency percentage of stage 1-3 to multi-speed V/F
Fb: Rated motor operating frequency
Fb ：电机额定运行频率
123
Frequency
%
频率%
0.0%
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