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101
V/F pattern
4
PARAMETERS
4.6.3 Adjustable 5 points V/F (Pr. 71, Pr. 100 to Pr. 109)
<V/F>
The above parameters can be set when Pr. 160 User group read selection = "0". (Refer to page 201)
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
Number
Name Initial Value Setting Range Description
71 Applied motor 0 0, 1, 2, 20, 120, 210
Set "2" for adjustable 5 points V/F
control.
100 V/F1(first frequency) 9999 0 to 400Hz, 9999
Set each points (frequency,
voltage) of V/F pattern.
9999: No V/F setting
101 V/F1(first frequency voltage) 0V 0 to 1000V
102 V/F2(second frequency) 9999 0 to 400Hz, 9999
103 V/F2(second frequency voltage) 0V 0 to 1000V
104 V/F3(third frequency) 9999 0 to 400Hz, 9999
105 V/F3(third frequency voltage) 0V 0 to 1000V
106 V/F4(fourth frequency) 9999 0 to 400Hz, 9999
107 V/F4(fourth frequency voltage) 0V 0 to 1000V
108 V/F5(fifth frequency) 9999 0 to 400Hz, 9999
109 V/F5(fifth frequency voltage) 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.
(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
characteristic).
3)Set the frequency and voltage you want to set in Pr. 100 to Pr. 109.
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 ( ) 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) 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.
♦ Parameters referred to ♦
⋅ Pr. 3 Base frequency, Pr. 19 Base frequency voltage Refer to page 98
⋅ Pr. 12 DC injection brake operation voltage Refer to page 123
⋅ Pr. 47 Second V/F (base frequency) Refer to page 98
⋅ Pr. 60 Energy saving control selection Refer to page 176
⋅ Pr. 71 Applied motor Refer to page 122
⋅ Pr. 80 Motor capacity, Pr. 90 Motor constant (R1) Refer to page 89
V/F
V/F
V/F
B
ase frequency
voltage
Pr.19
Base frequency
Pr.3
Torque boost
Pr.0
V/F Characteristic
0
V/F5
V/F4
V/F3
V/F2
V/F1
Frequency
Voltage
CAUTION
Make sure to set this parameter correctly according to the motor used.
Incorrect setting may cause the motor to overheat and burn.
Pr. 71
Standard Motor Setting
0, 2, 20, 120
Constant-torque Motor Setting
1
Pr. 0 3% 2%
Pr. 12 4% 2%