Load Pattern Selection (Pr. 14) - Mitsubishi FR-F720-00046-NA Instruction Manual

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
Name
Number
14 Load pattern selection
The above parameters can be set when Pr. 160 User group read selection = "0". (Refer to page 192)
Pr. 14 = "0"
100%
Pr. 3 Base frequency
Output frequency (Hz)
Pr. 14 = "1"
100%
Pr. 3 Base frequency
Output frequency (Hz)
♦ Parameters referred to ♦
Pr. 3 Base frequency Refer to page 89
Initial Value
1
(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.
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
(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.
Setting Range
0 For constant-torque load
1 For variable-torque loads
V/F pattern
Description
91
4