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V/F pattern

4.6 V/F pattern
Purpose
Set motor ratings
Select a V/F pattern according to
applications
Use special motor
4.6.1
Base frequency, voltage (Pr. 3, Pr. 19, Pr. 47)
Used to adjust the inverter outputs (voltage, frequency) to the motor rating.
Parameter
Number
3
Base frequency
Base frequency voltage
19
*
Second V/F (base frequency)
47
*
* The parameters can be set when Pr. 160 User group read selection = "0" (Refer to page 201)
Pr.19
(2) Set multiple base frequencies (Pr. 47)
⋅ When you want to change the base frequency when switching two motors with one inverter, use the Pr. 47 Second V/F
(base frequency).
⋅ Pr. 47 Second V/F (base frequency) is valid when the RT signal is ON.
REMARKS
⋅ The RT signal acts as the second function selection signal and makes the other second functions valid. (Refer to page 137)
⋅ In the initial setting, the RT signal is assigned to the RT terminal. By setting "3" to any of Pr. 178 to Pr. 189 (Input terminal function
selection), you can assign the RT signal to the other terminal.
98
Base frequency, base
frequency voltage
Load pattern selection
Adjustable 5 points V/F
Name
Initial Value
Output frequency
(Hz)
Pr.3
Pr.47
Parameter that must be Set
Pr. 3, Pr. 19, Pr. 47
Pr. 71, Pr. 100 to Pr. 109
V/F
V/F
V/F
Setting Range
60Hz
0 to 400Hz
0 to 1000V
9999
8888
9999
0 to 400Hz
9999
9999
(1) 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 bypass operation, set Pr. 3 to the same value
as the power supply frequency.
⋅ If the frequency given on the motor rating plate is "50Hz" only,
always set to "50Hz". Leaving the base frequency unchanged
from "60Hz" may make the voltage too low and the torque
insufficient. 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).
⋅ When using the Mitsubishi constant-torque motor, set Pr. 3 to
60Hz.
Refer to Page
Pr. 14
S
S
S
MFVC
MFVC
MFVC
< V / F > < S M F V C >
Description
Set the frequency when the motor
rated torque is generated. (50Hz/60Hz)
Set the base 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
98
100
101

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