Mitsubishi FR-A800

(G) Control parameters
598
PARAMETERS
Parameters referred to
Pr.3 Base frequency, Pr.19 Base frequency voltage page 598
Pr.71 Applied motor page 438
Pr.178 to Pr.182 (input terminal function selection) page 430
5.16.2 Base frequency, voltage
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.
NOTE
• The RT (X9) signal acts as the second (third) function selection signal and makes the other second (third) functions valid.
(Refer to page 434.)
• 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).
Use this function to adjust the inverter outputs (voltage, frequency) to match with the motor rating.
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
V/FV/FV/F
Pr.19
Output frequency
(Hz)
Pr.3
Pr.47
Output voltage (V)
Pr.113