V/F Pattern; Base Frequency, Voltage (Pr. 3, Pr. 19, Pr. 47) - Mitsubishi Electric FR-E720-0.1KNC Instruction Manual

V/F pattern

5.8

V/F pattern

Purpose
Set motor ratings
Select a V/F pattern according to
applications.
5.8.1

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

Use this function to adjust the inverter outputs (voltage, frequency) to match with the motor rating.
Parameter
Number
3 Base frequency
19 ∗
Base frequency voltage
Second V/F (base
47 ∗
frequency)
∗ The above parameters can be set when Pr. 160 User group read selection = "0". (Refer to page 197)
Pr. 19
(2) Set two kinds of base frequencies (Pr. 47)
When you want to change the base frequency when switching two types of 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. Set "3" in any of Pr. 180 to Pr. 184 (input terminal function
selection) and assign the RT signal.
REMARKS
The RT signal acts as the second function selection signal and makes the other second functions valid. (Refer to page 165)
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Base frequency,
Base frequency voltage
Load pattern selection
Name Initial Value
60Hz
9999
9999
Output frequency
(Hz)
Pr. 3
Pr. 47
Parameter that should be Set
Pr. 3, Pr. 19, Pr. 47
V/F V/F V/F
Setting Range
0 to 400Hz
0 to 1000V
8888
9999
0 to 400Hz
9999
(1) Base frequency setting (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 "50Hz" only,
always set to "50Hz". Leaving the base frequency unchanged from
"60Hz" may make the voltage too low and the torque insufficient. It
may result in an inverter trip due to overload.
Special care must be taken when "1" (variable torque load) is set in
Pr. 14 Load pattern selection .
When using the Mitsubishi constant-torque motor, set Pr. 3 to
60Hz.
Refer to Page
Pr. 14
Description
Rated motor frequency. (50Hz/60Hz)
Base voltage.
95% of power supply voltage
Same as power supply voltage
Base frequency when the RT signal is ON.
Second V/F invalid
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