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V/F pattern
4.6.2 Load pattern selection (Pr. 14)
<V/F>
You can select the optimum output characteristic (V/F characteristic) for the application and load characteristics.
Parameter
Number
Name Initial Value Setting Range Description
14 Load pattern selection 1
0 For constant-torque load
1 For variable-torque loads
The above parameters can be set when Pr. 160 User group read selection = "0". (Refer to page 201)
(1) For constant-torque load (setting "0")
⋅ At or less than the base frequency voltage, the output voltage varies linearly with the
output frequency.
⋅ Set this value when driving the load whose load torque is constant if the speed varies,
e.g. conveyor, cart or roll drive.
(2) For variable-torque load (setting "1", initial value)
⋅ At or less than the base frequency voltage, the output voltage varies with the output
frequency in a square curve.
⋅ Set this value when driving the load whose load torque varies in proportion to the
square of the speed, e.g. fan or pump.
♦ Parameters referred to ♦
Pr. 3 Base frequency Refer to page 98
V/F
V/F
V/F
100%
Output voltage
Pr.3 Base frequency
Output frequency (Hz)
Pr.14 = 0
POINT
If the load is a fan or pump, select "For rated torque load (setting "0")" in any of the
following cases.
⋅ When a blower of large moment of inertia (J) is accelerated in a short time
⋅ For constant-torque load such as rotary pump or gear pump
⋅ When load torque increases at low speed, e.g. screw pump
100%
Output voltage
Pr.3 Base frequency
Output frequency (Hz)
Pr.14 = 1