# Adjustable 5 Points V/f (pr. 71, Pr. 100 To Pr. 109) - Mitsubishi Electric FR-A700 Instruction Manual

Fr-a700 series to 03460-na/09620-na/00330-n4/00170-n4.

## 4.10.4 Adjustable 5 points V/F (Pr. 71, Pr. 100 to Pr. 109)

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.
Parameter
Name
Number
71
Applied motor
100
V/F1(first frequency)
101
V/F1(first frequency voltage)
102
V/F2(second frequency)
103
V/F2(second frequency voltage)
104
V/F3(third frequency)
105
V/F3(third frequency voltage)
106
V/F4(fourth frequency)
107
V/F4(fourth frequency voltage)
108
V/F5(fifth frequency)
109
V/F5(fifth frequency voltage)
Voltage
Base frequency
voltage
Pr.19
V/F4
V/F3
Torque boost
V/F1
Pr.0
V/F2
0
V/F Characteristic
Set this parameter correctly according to the motor used.
Incorrect setting may cause the motor to overheat and burn.
CAUTION
⋅ 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 (
⋅ 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.
REMARKS
⋅ A greater energy saving effect can be expected by combining Pr. 60 Energy saving control selection and adjustable 5 points V/F.
⋅ For the FR-A720-00240, 00330 and FR-A740-00120, 00170, 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.
Standard Motor Setting
Pr. 71
0, 2, 3 to 8, 20, 23, 24, 40, 43, 44
Pr. 0
Pr. 12
♦ 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
Refer to page 92
Initial Value
0
9999
0V
9999
0V
9999
0V
9999
0V
9999
0V
⋅ 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
V/F5
increase the voltage only in a low-speed range since such a machine
requires large torque at a start.
(Setting procedure)
1)Set the rated motor voltage in Pr. 19 Base frequency voltage. (No
function at the setting of "9999" (initial value) or "8888".)
Frequency
2)Set Pr. 71 Applied motor to "2" (Adjustable 5 points V/F characteristic).
Base frequency
3)Set the frequency and voltage you want to set in Pr. 100 to Pr. 109.
Pr.3
CAUTION
Constant Torque Motor Setting
3%
4%
Refer to page 159
Refer to page 200
Refer to page 273
Refer to page 185
Refer to page 145
Refer to page 92
V/F
V/F
V/F
Setting Range
0 to 8, 13 to 18,
20, 23, 24, 30, 33,
34, 40, 43, 44, 50,
53, 54
0 to 400Hz, 9999
0 to 1000V
0 to 400Hz, 9999
0 to 1000V
0 to 400Hz, 9999
0 to 1000V
0 to 400Hz, 9999
0 to 1000V
0 to 400Hz, 9999
0 to 1000V
) appears.
1, 13 to 18, 50, 53, 54
2%
2%
Refer to page 159
Set V/F pattern
Description
Set "2" for adjustable 5 points V/F
control.
Set each points (frequency,
voltage) of V/F pattern.
9999: No V/F setting
4
165

#### This manual is also suitable for:

Fr-a720-00030Fr-a740-00015