Set V/F Pattern; Base Frequency, Voltage (Pr. 3, Pr. 19, Pr. 47) - Mitsubishi Electric FR-D720-008 Instruction Manual

4.5

Set V/F pattern

Purpose
Set motor ratings
Select a V/F pattern according to
applications.
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
Name
Number
3 Base frequency
19 ∗
Base frequency voltage
Second V/F (base
47 ∗
frequency)
* The above parameters can be set when Pr. 160 Extended function display selection = "0". (Refer to page 160)
Pr. 19
(2) Set two kinds of base frequencies (Pr. 47)
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. 178 to Pr. 182 (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 114)
Parameter that should be Set
Base frequency,
Base frequency voltage
Load pattern selection
Initial Value Setting Range
60Hz
9999
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
Output frequency
(Hz)
"60Hz" may make the voltage too low and the torque insufficient. It
Pr. 3
may result in an inverter trip due to overload.
Pr. 47
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.
Pr. 3, Pr. 19, Pr. 47
Pr. 14
V/F V/F V/F
0 to 400Hz Rated motor frequency (50Hz/60Hz)
0 to 1000V Base voltage
95% of power supply voltage
8888 (95% of doubled power supply voltage for
single-phase 100V power input model.)
Same as power supply voltage
(Twice the amount of the power supply
9999
voltage for single-phase 100V power input
model.)
0 to 400Hz Base frequency when the RT signal is on
9999 Second V/F invalid

Set V/F pattern

Refer to Page
83
85
Description
83
4