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2.3.3
Base frequency, base frequency voltage
(Pr.3
Used to adjust the inverter
outputs (voltage, frequency) to
the motor rating.
Parameter
Name
3
Base frequency
Base frequency
19
voltage
Second V/F
47
(base frequency)
<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 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.
CAUTION
1. Set 60Hz in Pr. 3 "base frequency" when using a Mitsubishi constant-torque
motor.
2. When automatic torque boost is selected, Pr. 47 is invalid. When automatic
torque boost is selected, setting "- - -" or "888" in Pr. 19 uses the rated
output voltage.
REMARKS
* The RT signal serves as the second function selection signal and makes the other second
functions valid.
Related parameters
RT signal (second function "Pr. 47") setting ⇒ Pr. 60 to Pr. 63 (input terminal function selection)
Motor setting ⇒ Pr. 71 "applied motor" (refer to page 67)
Automatic torque boost selection ⇒ Pr. 98 "automatic torque boost selection (motor capacity)"
, Pr.19
, Pr.47
Pr.19
Factory
Setting
Setting
Range
50Hz
0 to 120Hz
0 to 800V,
888
888, - - -
0 to 120Hz,
- - -
- - -
(refer to page 96)
(refer to page 119)
Explanation of functions (parameters)
)
888: 95% of power supply voltage
- - -: Same as power supply voltage
Setting is enabled when Pr. 30 = "1".
- - -: Function invalid
Setting is enabled when Pr. 30 = "1".
63
Output
frequency (Hz)
Pr.3
Pr.47
Remarks
2
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