Справочник Пользователя для Mitsubishi Electronics FR-A700

A dedicated V/F pattern can be made by freely setting the V/F characteristic between a startup and the base

frequency and base voltage under V/F control (frequency voltage/frequency).

The torque pattern that is optimum for the machine's characteristic can be set.

0

0 to 8, 13 to 18, 

20, 23, 24, 30, 33, 

34, 40, 43, 44, 50, 

53, 54

Set "2" for adjustable 5 points V/F 

control.

9999

 0 to 400Hz, 9999

Set each points (frequency, 

voltage) of V/F pattern.

9999: No V/F setting

0V

 0 to 1000V

9999

 0 to 400Hz, 9999

0V

 0 to 1000V

9999

 0 to 400Hz, 9999

0V

 0 to 1000V

9999

 0 to 400Hz, 9999

0V

 0 to 1000V

9999

 0 to 400Hz, 9999

0V

 0 to 1000V

⋅ Any V/F characteristic can be provided by presetting the parameters of

V/F1 (first frequency voltage/first frequency) to V/F5.

⋅ For a machine of large static friction coefficient and small dynamic

static friction coefficient, for example, set a V/F pattern that will

increase the voltage only in a low-speed range since such a machine

requires large torque at a start.

1)Set the rated motor voltage in Pr. 19 Base frequency voltage. (No

function at the setting of "9999" (initial value) or "8888".)

2)Set Pr. 71 Applied motor to "2" (Adjustable 5 points V/F characteristic).

3)Set the frequency and voltage you want to set in Pr. 100 to Pr. 109.

⋅ Adjustable 5 points V/F characteristics function only under V/F control. They do not function under Advanced magnetic flux

vector control, Real sensorless vector control or vector control.

⋅ When Pr. 19 Base frequency voltage = "8888" or "9999", Pr. 71 cannot be set to "2". To set Pr. 71 to "2", set the rated voltage value in Pr. 19.
⋅ When the frequency values at each point are the same, a write disable error (

) appears.

⋅ Set the points (frequencies, voltages) of Pr. 100 to Pr. 109 within the ranges of Pr. 3 Base frequency and Pr. 19 Base frequency voltage.

⋅ When "2" is set in Pr. 71, Pr. 47 Second V/F (base frequency) and Pr. 113 Third V/F (base frequency) will not function.

⋅ When Pr. 71 is set to "2", the electronic thermal relay function makes calculation as a standard motor.

⋅ A greater energy saving effect can be expected by combining Pr. 60 Energy saving control selection and adjustable 5 points V/F.

⋅ For the 5.5K, 7.5K, the Pr. 0 Torque boost and Pr. 12 DC injection brake operation voltage settings are automatically changed

according to the Pr. 71 setting as follows.

♦ Parameters referred to ♦

⋅ Pr. 3 Base frequency, Pr. 19 Base frequency voltage  

⋅ Pr. 12 DC injection brake operation voltage  

⋅ Pr. 47 Second V/F (base frequency), Pr. 113 Third V/F (base frequency)  

⋅ Pr. 60 Energy saving control selection  

⋅ Pr. 71 Applied motor, Pr. 450 Second applied motor  

⋅ Advanced magnetic flux vector control 

⋅ Real sensorless vector control 

⋅ Vector control 

V/F Characteristic

0

V/F5

V/F4

V/F3

V/F2

V/F1

Frequency

Voltage

Make sure to set this parameter correctly according to the motor used. 

Incorrect setting may cause the motor to overheat and burn.

3%

2%

4%

2%