81
V/F pattern
4
PA
R
A
M
E
T
E
R
S
4.5.3
Adjustable 5 points V/F (Pr. 71, Pr. 100 to Pr. 109)
The above parameters can be set when
Pr. 160 User group read selection
= "0".
(Refer to page 173)
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
Number
Name
Initial Value
Setting Range
Description
71
Applied motor
0
0, 1, 2, 20
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 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 (
) 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 00126 and 00170, the
Pr.0
Torque boost
and
Pr.12
DC injection brake operation voltage
settings are automatically changed
according to the
Pr. 71
setting.
i
Parameters referred to
i
Pr. 3 Base frequency, Pr. 19 Base frequency voltage
Refer to page 78
Pr. 12 DC injection brake operation voltage
Refer to page 100
Pr. 47 Second V/F (base frequency)
Refer to page 78
Pr. 60 Energy saving control selection
Refer to page 147
Pr. 71 Applied motor
Refer to page 99
Pr. 80 Motor capacity(Simple magnetic flux vector control), Pr. 90 Motor constant (R1)
Refer to page 68
Base 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
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
Constant-torque Motor Setting
1
Pr. 0
3%
2%
Pr. 12
4%
2%
Summary of Contents for F700
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