Powtran PI9000 series User Manual page 128

Chapter 5 Function parameter
Torque boost cut-off
F4.02
frequency
Torque boost is mainly used to improve the characteristics of the torque low-frequency
under V/F control mode. If the torque boost is too low, the motor will work at the lower
speed and power. If the torque boost is too high, the motor will run with overexcitation, the
inverter's output current increases and the efficiency is reduced.
It is recommended to increase this parameter when the motor works with heavy load but
without enough torque. The torque boost can be reduced when the load is lighter. When the
torque boost is set to 0.0, the inverter will automatically perform torque boost, the inverter
can automatically calculates the required torque boost value according to the motor stator
resistance parameters.
Torque boost cutoff frequency: torque boost is valid below this frequency, invalid above
the set frequency.
Output
voltage
Vb
V1
V1 ：手动转矩提升电压
V1: Manual torque boost voltage
f1: Manual torque boost cut-off frequency fb: Rated operating frequency
f1 ：手动转矩提升截止频率
Schematic diagram of manual torque boost voltage
Multi-point
F4.03
frequency point F1
Multi-point
F4.04
point V1
Multi-point
F4.05
frequency point F2
Multi-point
F4.06
point V2
Multi-point
F4.07
frequency point F3
Multi-point
F4.08
point V3
F4.03 to F4.08 six parameters are used to define multi-point V/F curve.
The multi-point V/F curve is set according to the load characteristics of motor, please be
noted that the relationship between three voltage points and three frequency points must be
0.00Hz to F0.19
(maximum frequency)
f1
Vb ：最大输出电压
Vb: Maximum output voltage
fb ：额定运行频率
手动转矩提升示意图
V/F
0.00Hz to F4.05
voltage
V/F
0.0% to 100.0%
V/F
F4.03 to F4.07
voltage
V/F
0.0% to 100.0%
F4.05 to b0.04(rated
V/F
motor frequency)
voltage
V/F
0.0% to 100.0%
fb
输出频率
Output frequency
122
★
15.00Hz
★
0.00Hz
★
0.0%
★
0.00Hz
★
0.0%
★
0.00Hz
★
0.0%