4.10 Set V/F pattern
Set motor ratings
Select a V/F pattern according to
Automatically set a V/F pattern for
Use special motor
4.10.1 Base frequency, voltage (Pr. 3, Pr. 19, Pr. 47, Pr. 113)
Used to adjust the inverter outputs (voltage, frequency) to the motor rating.
Base frequency voltage
Second V/F (base frequency)
Third V/F (base frequency)
(2) Set multiple base frequencies (Pr. 47, Pr. 113)
⋅ When you want to change the base frequency when switching two motors with one inverter, use the Pr. 47 Second V/F
⋅ Pr. 47 Second V/F (base frequency) is made valid when the RT signal in ON and Pr. 113 Third V/F (base frequency) is
made valid when the X9 signal is on. Assign the terminal for X9 signal input using any of Pr. 178 to Pr. 189 (input
terminal function selection).
⋅ The RT(X9) signal acts as the second (third) function selection signal and makes the other second (third) functions valid. (Refer
to page 232)
⋅ In the initial setting, the RT signal is assigned to the RT terminal. By setting "3" in any of Pr. 178 to Pr. 189 (input terminal function
selection), you can assign the RT signal to the other terminal.
Parameter that must be Set
Base frequency, base
Load pattern selection
Elevator mode (automatic
Adjustable 5 points V/F
(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.
Special care must be taken when "1" (reduced torque load) is
set in Pr. 14 Load pattern selection.
⋅ When using the Mitsubishi constant-torque motor, set Pr. 3 to
Pr. 3, Pr. 19, Pr. 47, Pr. 113
Pr. 61, Pr. 64, Pr. 292
Pr. 71, Pr. 100 to Pr. 109
Set the frequency when the motor
0 to 400Hz
rated torque is generated. (50Hz/60Hz)
0 to 1000V
Set the base voltage.
95% of power supply voltage
Same as power supply voltage
Set the base frequency when the RT
0 to 400Hz
signal is on.
Second V/F invalid
Set the base frequency when the X9
0 to 400Hz
signal is ON.
Third V/F is invalid
Set V/F pattern
Refer to Page