Mitsubishi Electronics FR-F700-NA

V/F pattern

PARAMETERS

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 10 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)