Set V/F Pattern; Base Frequency, Voltage (Pr. 3, Pr. 19, Pr. 47, Pr. 113) - Mitsubishi Electric FR-A720-0.4K Instruction Manual

4.10 Set V/F pattern

Purpose
Set motor ratings
Select a V/F pattern according to
applications
Automatically set a V/F pattern for
elevators
Use special motor

4.10.1 Base frequency, voltage (Pr. 3, Pr. 19, Pr. 47, Pr. 113)

Used to adjust the inverter outputs (voltage, frequency) to the motor rating.
Parameter
Name
Number
3 Base frequency
19 Base frequency voltage
47 Second V/F (base frequency)
113 Third V/F (base frequency)
Pr.19
(2) 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).
REMARKS
⋅ The RT(X9) signal acts as the second (third) function selection signal and makes the other second (third) functions valid. (Refer
to page 226)
⋅ In the initial setting, the RT signal is assigned to the RT terminal. By setting "3" in any of Pr. 178 to Pr. 189 (input terminal function
selection), you can assign the RT signal to the other terminal.
Parameter that must be Set
Base frequency, base
frequency voltage
Load pattern selection
Elevator mode (automatic
acceleration/deceleration)
Adjustable 5 points V/F
Initial Value Setting Range
60Hz
9999
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 "50Hz" only,
always set to "50Hz". Leaving the base frequency unchanged
Output frequency
from "60Hz" may make the voltage too low and the torque
(Hz)
insufficient. It may result in an inverter trip due to overload.
Pr.3
Special care must be taken when "1" (reduced torque load) is
Pr.47
set in Pr. 14 Load pattern selection.
Pr.113
⋅ When using the Mitsubishi constant-torque motor, set Pr. 3 to
60Hz.
Pr. 3, Pr. 19, Pr. 47, Pr. 113
Pr. 14
Pr. 61, Pr. 64, Pr. 292
Pr. 71, Pr. 100 to Pr. 109
V/F V/F V/F
Set the frequency when the motor
0 to 400Hz
rated torque is generated. (50Hz/60Hz)
0 to 1000V Set the base voltage.
8888 95% of power supply voltage
9999 Same as power supply voltage
Set the base frequency when the RT
0 to 400Hz
signal is on.
9999 Second V/F invalid
Set the base frequency when the X9
0 to 400Hz
signal is ON.
9999 Third V/F is invalid

Set V/F pattern

Refer to Page
155
157
159
160
Description
155
4