Adjustable 5 Points V/F (Pr. 71, Pr. 100 To Pr. 109) <V/F - Mitsubishi Electric FR-F720P-0.75K to 110K Instruction Manual

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4.6.3
Adjustable 5 points V/F (Pr. 71, Pr. 100 to Pr. 109)
Create a dedicated V/F pattern for V/F (frequency voltage/frequency) control by setting unique V/F
characteristics at start-up and up to the base frequency/voltage point.
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)
The above parameters can be set when Pr. 160 User group read selection = "0". (Refer to page 201)
Voltage
Base frequency
voltage
Pr.19
V/F4
V/F3
Torque boost
V/F1
Pr.0
V/F2
0
V/F Characteristic
Make sure to 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 are available only under V/F control or Optimum excitation control. These are not
available under Simple magnetic flux vector control or IPM motor 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 5.5K and 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.
Standard Motor Setting
Pr. 71
0, 2, 20, 120
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. 60 Energy saving control selection
⋅ Pr. 71 Applied motor
Refer to page 122
⋅ Pr. 80 Motor capacity, Pr. 90 Motor constant (R1)
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 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
Frequency
characteristic).
Base frequency
Pr.3
3)Set the frequency and voltage you want to set in Pr. 100 to Pr. 109.
CAUTION
Constant-torque Motor Setting
3%
4%
Refer to page 98
Refer to page 123
Refer to page 98
Refer to page 176
Refer to page 89
V/F
V/F
V/F
< V / F >
Setting Range
Set "2" for adjustable 5 points V/F
0, 1, 2, 20, 120, 210
control.
0 to 400Hz, 9999
0 to 1000V
0 to 400Hz, 9999
0 to 1000V
Set each points (frequency,
0 to 400Hz, 9999
voltage) of V/F pattern.
0 to 1000V
9999: No V/F setting
0 to 400Hz, 9999
0 to 1000V
0 to 400Hz, 9999
0 to 1000V
) appears.
1
2%
2%
V/F pattern
Description
101
4

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