6. Description of Parameters
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2. User-deîš¿ned Multi-point V/F curve
Figure 6-37 User-deîš¿ned Multi-point V/F curve
Output frequency
Output voltage
f1
f2
f3
F3-04: V1
F3-06: V2
Rated voltage
Rated frequency
F3
-08: V3
F3-03 F3-05 F3-07
F3-03 to F3-08 deîš¿ne multi-point V/F curve.
You must set multi-point V/F curve based on motor’s load characteristic. The three
voltage points and frequency points must satisfy: V1 < V2 < V3, f1 < f2 < f3. When
you set F1 (F3-03), F2 (F3-05) and F3 (F3-07), set F3-07 îš¿rst, then F3-05 and îš¿nally
F3-03.
3. Variable-torque Square V/F curve
Figure 6-38 Variable-torque Square V/F curve
Output frequency
Output voltage
F1-02
(Rated voltage)
F1-04
(Rated frequency)
F3-01
(Torque boost)
Output voltage and output frequency change according to square curve when below
rated frequency. It is applicable to applications such as centrifugal fans where the load
is inversely proportional to the speed.
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