Sako SKI600 - Page 99

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4: square curve
Square curve is suitable for square torque
type load such as draught fan and water
pump to achieve the optimum energy-
saving e󽗈ect. Output voltage value is output
frequency value to the second power, as
curve 4 showed in Fig. F5-1.
Fig. F5-1 V/F Curve
To compensate for low frequency torque
characteristics, it is feasible to boost output
voltage. This function code indicates
automatically torque compensation with
set value of 0.0% and manual torque
compensation with any set value other than
0.0%. F5.08 defines cut-off frequency fz of
manual torque compensation, as showed in
Fig. F5-3 (Vb is manual boost voltage).
F5.07
torque compensation set
0.0 ～ 30.0％ motor rated
voltage
Type
setting
F5.08
torque compensation cut-o󽗈 frequency
0.0 ～ motor rated power 50.00
Voltage and frequency is as showed in Fig. F5-2.
Fig. F5-2 User Setting V/F Curve
F5.01
V/F frequency value F1
0.00 ～ frequency value F2 12.50
F5.02
V/F voltage value V1
0.0 ～ voltage value V2 25.0%
F5.03
V/F frequency value F2
Frequency value
F1 ～ frequency value F3
25.00
F5.04
V/F voltage value V2
Voltage value V1 ～ voltage
value V3
50.0%
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Fig. F5-3 Torque Boost
4.2 Detailed Function Description
5: user-defined V/F curve (determined by
F5.01 ～ F5.06)
When set F5.00 as 5, users can customize V/
F curve via F5.01 ～ F5.06, by adding (VI,F1),
(V2,F2),(V3,F3), origin, and max. freq. point
to form a broken line, so as to meet special
load characteristic. The curve is as showed
in Fig. F5-2. Voltage and frequency is as
showed in Fig. F5-2.
F5.05
V/F frequency value F3
Frequency value F2 ～
motor rated frequency
37.50
F5.06
V/F voltage value V3
Voltage value V2 ～ 100.0％
*motor rated voltage
75.0%