Parameter Description VD500 Series Inverter User Manual
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than the set frequency, torque boost failure, see below instructions.
Vb
V1
f1
fb
Output voltage
Output frequency
V1: manual torque boost voltage Vb: max output voltage
f1: manual torque boost cutoff frequency fb: rated running frequency
Fig 6-6 Manual torque boost diagram
F4-04
MS VF Frequency Point 1
0.00Hz~F4-05
0.00Hz
◎
F4-05
MS VF Voltage Point 1
0.0%~100.0%
0.0%
◎
F4-06
MS VF Frequency Point 2
F4-04~F4-07
0.00Hz
◎
F4-07
MS VF Voltage Point 2
0.0%~100.0%
0.0%
◎
F4-08
MS VF Frequency Point 3
F4-05~Rated motor frequency (F2-04)
0.00Hz
◎
F4-09
MS VF Voltage Point 3
0.0%~100.0%
0.0%
◎
F4-03~F4-08 six parameters defined multistage V/F curve.
The curve of multipoint V/F should set according to the motor load characteristic, what need note is,
the relationship between the three point voltage and frequency points must be satisfied: V1<V2<V3,
F1<F2<F3. Figure 6-7 is multipoint V/F curve set diagram.
Voltage%
Vb
V3
V2
V1
F1
F2
F3
Fb
Frequency%
V1-V3: MS speed V/F voltage percentage of 1-3 section
F1-F3: MS speed V/F voltage percentage of 1-3 section
Vb: rated motor voltage Fb: rated motor running frequency
Fig 6-7 Multipoint V/F curve set diagram
Voltage set too high may lead to motor overheating or even burning when low frequency, frequency
inverter may be loss of speed or overcurrent protection.
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