Chapter 6 Function Introduction Shenzhen Hpmont Technology Co., Ltd
―72― HD20 Series Inverters User Manual
6.2.10 Group F09 V/f Control Parameters
No. Name Description Range
factory setting
F09.00 V/f curve selection of motor 1 0
4
0
It defines flexible V/f setting modes so as to meet
requirements of different load characteristics.
• Four preset curves and one user-defined
curve can be selected according to the setting
of F09.00.
0: Line. Shown as curve 0 in figure.
1: Square curve. Shown as curve 1 in the figure.
2: 1.2 exponential curve. Shown as curve 2 in the
figure.
3: 1.7 exponential curve. Shown as curve 3 in the
figure.
4: User-defined curve.
F09.01 V/f frequency value F3 of motor 1 F09.03
F08.03
0.00Hz
V/f voltage value V3 of motor 1
F09.03 V/f frequency value F2 of motor 1 F09.05
F09.01
0.00Hz
V/f voltage value V2 of motor 1
F09.05 V/f frequency value F1 of motor 1 0.00
F09.03
0.00Hz
V/f voltage value V1 of motor 1
F09.01－F09.06 is the user-definable V/f curve.
• If F09.00 = 4 (user-definable curve), F09.06 is
enabled.
• The V/f curve can be defined by connecting 3
points of (V1, F1), (V2, F2) and (V3, F3), to
adapt to special load.
• According to the actual operation, set proper
curve to meet the requirements of load
characteristics.
F09.08 Cut-off point used for manual torque boost of motor 1 0.0
50.0 (F08.03)
30.0%
In order to compensate the torque drop at low
frequency, the inverter can boost the voltage so
as to boost the torque.
• No matter what kind of V/f curve is set by
F09.00, the torque boost is enabled.
If F09.07 = 0, auto torque boost is enabled.
• If F09.07 is set as non-zero, manual torque
boost is enabled.
F09.08 is relative to percentage of motor’s rated
frequency (F08.03).
Output voltage
Output freq.
0
1
3
2
0
F08.01
F08.03
1/3 x F08.01
1/3 x F08.03
F09.05 F09.03 F09.01 F08.03
F09.06
F09.04
F09.02
F08.01
Frequency
Voltage
0
V1,F1
V2,F2
V3,F3
F09.08max F08.03
Voltage of manual
torque boost
F08.01
Frequency
Voltage
0
Boosted value
F09.08max = 50% F08.03
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