V/F Pattern; Base Frequency, Voltage (Pr. 3, Pr. 19, Pr. 47) - Mitsubishi Electric FR-F740-00023 Instruction Manual

V/F pattern

4.5 V/F pattern

Purpose
Set motor ratings
Select a V/F pattern according to
applications
Use special motor
4.5.1

Base frequency, voltage (Pr. 3, Pr. 19, Pr. 47)

Used to adjust the inverter outputs (voltage, frequency) to the motor rating.
Parameter
Number
3 Base frequency
Base frequency voltage
19
*
Second V/F (base frequency)
47
*
* The parameters can be set when Pr. 160 User group read selection = "0" (Refer to page 173)
Pr.19
(2) Set multiple base frequencies (Pr. 47)
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 valid when the RT signal is on.
REMARKS
The RT signal acts as the second function selection signal and makes the other second functions valid. (Refer to page 113)
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.
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Base frequency, base
frequency voltage
Load pattern selection
Adjustable 5 points V/F
Name Initial Value
Output frequency
(Hz)
Pr.3
Pr.47
Parameter that must be Set
Pr. 3, Pr. 19, Pr. 47
Pr. 71, Pr. 100 to Pr. 109
Setting Range
50Hz 0 to 400Hz
0 to 1000V
8888 8888
9999
0 to 400Hz
9999
9999
(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 "60Hz" only,
always set to "60Hz". It may result in an inverter trip due to
overload. Caution must be taken especially when Pr. 14 Load
pattern selection = "1" (variable torque load).
When using the Mitsubishi constant-torque motor, set Pr. 3 to
60Hz.
Refer to Page
Pr. 14
Description
Set the frequency when the motor
rated torque is generated. (50Hz/60Hz)
Set the base voltage.
95% of power supply voltage
Same as power supply voltage
Set the base frequency when the RT
signal is on.
Second V/F invalid
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80
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