Adjustable 5 Points V/F (Pr. 71, Pr. 100 To 109) - Mitsubishi Electric F700 Instruction Manual

Set V/F pattern
3.4.2

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

A dedicated V/F pattern can be made by freely setting the V/F characteristic between a startup and the base
Pr. 69
frequency and base voltage under V/F control (frequency voltage/frequency).
page 114
The torque pattern that is optimum for the machine's characteristic can be set.
Pr. 72
page 124
Parameter
Pr. 90
Number
page 54
Pr. 117
71 Applied motor
page 161
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)
The above parameters can be set when Pr. 160 User group read selection = "0". (Refer to page 140)
Voltage
Base Frequency
Voltage
Pr.19
Torque boost
V/F1
Pr.0
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 or optimum excitation control. They do not function for
simple magnetic flux 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) 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 00126 and 00170, the Pr. 0 and Pr. 12 settings are automatically changed according to the Pr. 71 setting.
Pr. 71
Pr. 0
Pr. 12
♦ Parameters referred to ♦
⋅ Pr. 3 Base frequency, Pr. 19 Base frequency voltage
⋅ Pr. 47 Second V/F (base frequency)
⋅ Pr. 60 Energy saving control selection
⋅ Pr. 71 Applied motor
⋅ Pr. 60 Motor capacity (simple magnetic flux vector control), Pr. 90 Motor constant (R1)
66
Name
⋅ Any V/F characteristic can be provided by presetting the
⋅ For a machine of large static friction coefficient and small dynamic
V/F5
V/F4
(Setting procedure)
V/F3
V/F2
Frequency
Base Frequency
Pr.3
0, 2, 20 1
3% 2%
4% 2%
Refer to page 64
Refer to page 118
Refer to page 80
Initial Value Setting Range
0 0, 1, 2, 20
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
9999 0 to 400Hz, 9999
0V 0 to 1000V
parameters of V/F1 (first frequency voltage/first frequency) to V/F5.
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 current 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.
CAUTION
Refer to page 64
Description
Set "2" for adjustable 5 points V/F
control.
Set each points (frequency,
voltage) of V/F pattern.
9999: No V/F setting
) appears.
Refer to page 54