91
V/F pattern
4
4.5.2
Load pattern selection (Pr. 14)
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 190)
(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 89
100%
Output voltage
Pr.3
Base frequency
Output frequency (Hz)
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)
Содержание 700 Series
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