Table of Contents
Set V/f pattern
6.4
Set V/f pattern
Purpose
Set motor ratings
Select a V/f pattern according to
applications
6.4.1
Base frequency, voltage (Pr. 3, Pr. 19, Pr. 47)
Used to adjust the inverter outputs (voltage, frequency) to the motor rating.
Pr.
Name
No.
3
Base frequency
Base frequency
19
voltage
Second V/f
47
(base frequency)
The above parameter can be set when Pr. 160 = 0.
Setting of base frequency (Pr. 3)
When operating a standard motor, generally set the rated frequency of the motor to Pr. 3 "Base
frequency".
When running the motor using commercial power supply-inverter switch-over operation, set
Pr. 3 to the same value as the power supply frequency.
If the frequency given on the motor rating plate is "60Hz" only, always set to "60Hz". It may result
in an inverter trip due to overload. Caution must be taken especially when Pr. 14 "Load pattern
selection" = "1" (variable torque load)
Fig. 6-11: Output voltage related to the output frequency
6 - 44
Initial Value
Setting Range
50Hz
0–400Hz
0–1000V
8888
8888
9999
0–400Hz
9999
9999
[ % ]
100
Parameters that must be set
Base frequency, Base frequency voltage
Load pattern selection
Description
Set the frequency when the motor
rated torque is generated. (50Hz/
60Hz)
Set the rated motor voltage.
95% of power supply voltage
Same as power supply voltage
Set the base frequency when the RT
signal is on.
Second V/f invalid
Pr. 3 = 50Hz, Pr. 19 = 9999
Pr. 3 = 60Hz, Pr. 19 = 220V
50 60
Base frequency setting range
Refer to
Section
Pr. 3, Pr. 19,
6.4.1
Pr. 47
Pr. 14
6.4.2
V/F
V/F
V/F
Parameters referred to
14
Load pattern
selection
29
Acceleration/decel-
eration pattern
selection
83
Motor rated
voltage
84
Rated motor fre-
quency
178–182
Input terminal
function selection
General-purpose
magnetic flux vec-
tor control
[Hz]
120
Parameter
Refer to
Section
6.4.2
6.6.3
6.7.3
6.7.3
6.9.1
6.2.2
I000003aC
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