Mitsubishi Electric FR-A800, Instruction Manual

Page: 834 / 1042

(G) Control parameters Parameters
5 - 654
5.16.2 Base frequency, voltage
Use this function to adjust the inverter outputs (voltage, frequency) to match with the motor rating.
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.
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.
Pr. Name
Initial value
Setting
range
Description
FM CA
3
G001
Base frequency 60 Hz 50 Hz 0 to 590 Hz
Set the frequency at the rated motor torque.
(50 Hz/60 Hz)
19
G002
Base frequency voltage 9999 8888
0 to 1000 V Set the base voltage.
8888 95% of the power supply voltage
9999 Same as the power supply voltage
47
G011
Second V/F
(base frequency)
9999
0 to 590 Hz Set the base frequency at the RT signal ON.
9999 Second V/F disabled
113
G021
Third V/F (base frequency) 9999
0 to 590 Hz Set the base frequency at the X9 signal ON.
9999 Third V/F disabled
Fig. 5-323:
Output voltage related to the output frequency
I002749E
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).
V/F V/F V/F
Ou
tput
v
o
ltage (
V
)
Output frequency
(Hz)
Pr. 3
Pr. 47
Pr. 113
Pr. 19