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Explanation of functions (parameters)
2
FUNCTIONS
2.3.3 Base frequency, base frequency voltage
(Pr.3 , Pr.19 , Pr.47 )
<Setting>
•In Pr. 3 and Pr. 47, set the base frequency (motor's rated frequency).
Use the RT signal to switch between these two different base frequencies.
(Turn on the RT signal to make Pr. 47 valid.) (*)
When running the standard motor, generally set the "base frequency" to the rated
frequency of the motor. When running the motor using electronic bypass operation,
set the base frequency to the same value as the power supply frequency.
If only "50Hz" is given on the motor rating plate as the frequency, always set the
"base frequency" to "50Hz". If it remains at "60Hz", the voltage may become too low
and torque shortage occurs, resulting in an overload trip. Special care must be taken
when "1" is set in Pr. 14 "load pattern selection".
If "50Hz/60Hz" is given on the motor rating plate as the frequency, always set the
"base frequency" to "60Hz". When running the motor using commercial power
supply-inverter switch-over operation, set the base frequency to the same value as
the power supply frequency.
•Set the base voltage (e.g. rated voltage of motor) in Pr. 19.
Used to adjust the inverter
outputs (voltage, frequency) to
the motor rating.
Parameter Name
Factory
Setting
Setting
Range
Remarks
3 Base frequency 60Hz 0 to 120Hz
19
Base frequency
voltage
- - -
0 to 800V,
888, - - -
888: 95% of power supply voltage
- - -: Same as power supply voltage
Setting is enabled when Pr. 30 = "1".
47
Second V/F
(base frequency)
- - -
0 to 120Hz,
- - -
- - -: Function invalid
Setting is enabled when Pr. 30 = "1".
Pr.19
Output voltage
Output
frequency (Hz)
Pr.3
Pr.47