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4.2.3 Base frequency, base frequency voltage (Pr. 3, Pr. 19, Pr. 47)
Pr. 3 "base frequency"
Pr. 19 "base frequency voltage"
Pr. 47 "second V/F ( base frequency )
Used to adjust the inverter outputs (voltage, frequency) to the motor rating.
! When running a standard motor, generally set the rated motor frequency. When
running the motor using the commercial power supply-inverter switch-over, set the
base frequency 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 it as "60Hz" may make the voltage too low and the torque less, resulting in
overload tripping. Care must be taken especially when Pr. 14 "load pattern selection" = 1.
Parameter
Factory
Number
Setting
3
60Hz
19
9999
47
9999
<Setting>
" Use Pr. 3 and Pr. 47 to set the base frequency (rated motor frequency). Two base
frequencies can be set and the required frequency can be selected from them.
" Pr. 47 "Second V/F (base frequency)" is valid when the RT signal is on. (Note 3)
" Use Pr. 19 to set the base voltage (e.g. rated motor voltage).
Note: 1. Set 60Hz in Pr. 3 "base frequency" when using a constant-torque motor.
2. When the general-purpose magnetic flux vector control mode has been
selected, Pr. 3, Pr. 19 and Pr. 47 are made invalid and Pr. 83 and Pr. 84 are
made valid.
3. The RT signal serves as the second function selection signal and makes the
other second functions valid. Refer to page 130 for Pr. 180 to Pr. 183 (input
terminal (remote output) function selection).
Setting Range
0 to 400Hz
0 to 1000V, 8888, 9999
0 to 400Hz, 9999
Pr.19
78
Related parameters
Pr. 14 "load pattern selection"
Pr. 71 "applied motor"
Pr. 80 "motor capacity"
Pr. 83 "rated motor voltage"
Pr. 180 to Pr. 183 (input terminal
(remote output) function
selection)
Remarks
8888: 95% of power supply voltage
9999: Same as power supply voltage
9999: Function invalid
Output frequency (Hz)
Pr.3
Pr.47
PARAMETERS
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