Base Frequency, Voltage - Mitsubishi Electric FR-A820-00046 Instruction Manual

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(G) Control parameters
5.16.2

Base frequency, voltage

Use this function to adjust the inverter outputs (voltage, frequency) to match with the motor rating.
Pr.
3
G001
19
G002
47
G011
113
G021
Setting of base frequency (Pr. 3)
● When operating a standard motor, generally set the rated frequency of the motor in Pr. 3 "Base
frequency". When the motor operation require switching to the commercial power supply, set the
power supply frequency in Pr. 3.
● When the frequency on the motor rating plate is only "50 Hz", make sure to set to "50 Hz". When
it is set to "60 Hz", the voltage will drop too much, causing insufficient torque. As a result, the
inverter may trip due to overload.
A caution is required especially in case of Pr. 14 "Load pattern selection" = "1" (variable torque
load).
● When using the Mitsubishi constant torque motor, set Pr. 3 to 60 Hz.
Pr. 19
Setting multiple base frequencies (Pr. 47, Pr. 113)
● To change the base frequency when using single inverter switching between multiple motors,
use Pr. 47 "Second V/F (base frequency)" and Pr. 113 "Third V/F (base frequency)".
● Pr. 47 will become enabled when the RT signal turns ON and Pr. 113 when the X9 signal turns ON.
To input the X9 signal, set "9" in any of Pr. 178 to Pr. 189 (input terminal function selection) to
assign the function to a terminal.
NOTES
The RT (X9) signal acts as the second (third) function selection signal and makes the other second
(third) functions valid. (Refer to page 5-428.)
The RT signal is assigned to the terminal RT in the initial status. It is also possible to assign the RT
signal to other terminal by setting "3" on Pr. 178 to Pr. 189 (input terminal function selection).
5 - 654
V/F
V/F
V/F
Initial value
Name
FM
Base frequency
60 Hz 50 Hz
Base frequency voltage
9999
Second V/F
(base frequency)
Third V/F (base frequency)
Output frequency
(Hz)
Pr. 3
Pr. 47
Pr. 113
Setting
Description
range
CA
Set the frequency at the rated motor torque.
0 to 590 Hz
(50 Hz/60 Hz)
0 to 1000 V
Set the base voltage.
8888
8888
95% of the power supply voltage
9999
Same as the power supply voltage
0 to 590 Hz
Set the base frequency at the RT signal ON.
9999
9999
Second V/F disabled
0 to 590 Hz
Set the base frequency at the X9 signal ON.
9999
9999
Third V/F disabled
Fig. 5-323:
Output voltage related to the output frequency
Parameters
I002749E

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