Mitsubishi Electric FR-A700 Instruction Manual page 353

Parameter
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 "Loadpattern
selection" = "1" (variable torque load).
Fig. 6-59: Output voltage related to the output frequency
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 (base frequency)".
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".
NOTES
The RT(X9) signal acts as the second (third) function selection signal and makes the other
second (third) functions valid.
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.
FR-A700 EC
[ % ]
100
50 60
Base frequency setting range
Pr. 3 = 50Hz, Pr. 19 = 9999
Pr. 3 = 60Hz, Pr. 19 = 220V
120
Set V/f pattern
[Hz]
I000003aC
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