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Set V/F pattern
4
PARAMETERS
4.5.2 Load pattern selection (Pr. 14)
The above parameters can be set when Pr. 160 Extended function display selection = "0". (Refer to page 162)
Optimum output characteristic (V/F characteristic) for the application and load characteristics can be selected.
Parameter
Number
Name Initial Value Setting Range Description
14 Load pattern selection
0
0 For constant torque load
1 For variable torque load
2
For constant torque elevators
(at reverse rotation boost of 0%)
3
For constant torque elevators
(at forward rotation boost of 0%)
(1) Constant-torque load application (setting "0", initial value)
At or less than the base frequency, the output voltage varies linearly with the output
frequency.
Set this value when driving the load whose load torque is constant even if the speed
varies, e.g. conveyor, cart or roll drive.
(2) Variable-torque load application (setting "1")
At or less than the base frequency, 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.
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 constant-torque load (setting "0") in any of the following cases.
When a blower of large inertia moment (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